fix(labels): format adding new labels in service plan with + modifier

.github/workflows/lint.yml

@@ -30,6 +30,6 @@ jobs:
         run: git checkout mise.lock
 
       - name: Lint
-        run: make lint
+        run: mise run lint
 
     timeout-minutes: 10

AGENTS.md

@@ -98,33 +98,6 @@ management.
 
 - **`misc/`**: Design documents and guides
 
-## Key Technologies
-
-### Core Dependencies
-
-```go
-// Networking and orchestration
-github.com/docker/docker // Docker API client
-github.com/docker/compose/v2 // Docker Compose integration
-golang.zx2c4.com/wireguard // WireGuard implementation
-github.com/hashicorp/serf // Gossip protocol
-
-// State management
-github.com/ipfs/go-ds-crdt // CRDT distributed storage
-github.com/dgraph-io/badger/v3 // Embedded database
-
-// Web proxy
-github.com/caddyserver/caddy/v2 // HTTP server and reverse proxy
-
-// CLI and UX
-github.com/spf13/cobra // CLI framework
-github.com/charmbracelet/huh // Interactive forms
-
-// gRPC and networking
-google.golang.org/grpc                     // gRPC framework
-github.com/siderolabs/grpc-proxy // gRPC proxy for forwarding
-```
-
 ## Development Workflow
 
 ### Build and Development
@@ -135,16 +108,18 @@ go build -o uc ./cmd/uc
 go build -o uncloudd ./cmd/uncloudd
 ```
 
-### Key Make Targets
+### Formatting and Linting
+
+- `mise run lint`: Check Go code and formatting without changing files
+- `mise run lint:fix`: Apply formatting and available lint fixes
+
+### Other Development Tasks
 
 - `proto`: Generate protobuf code
 - `ucind-cluster`: Create development cluster
 - `update-dev`: Deploy to development machines
 - `demo-reset`: Reset demo environment
-- `fmt`: Format code
 - `test`: Run all tests
-- `lint`: Lint the code using golangci-lint
-- `lint-and-fix`: Lint the code and fix issues whenever possible
 
 ## CLI Commands Structure
 

HACKING.md

@@ -100,10 +100,16 @@ mise run dev:reset user@host1 user@host2
 
 ## Linting and formatting
 
-Lint and format the code:
+Check the code and formatting without changing files:
 
 ```shell
-make lint-and-fix
+mise run lint
+```
+
+Apply formatting and available lint fixes:
+
+```shell
+mise run lint:fix
 ```
 
 ## Code generation

Makefile

@@ -47,21 +47,3 @@ test-clean:
 	else \
 		echo "Nothing to clean."; \
 	fi
-
-.PHONY: vet
-vet:
-	go vet ./...
-
-.PHONY: format fmt
-format fmt:
-	GOOS=linux golangci-lint fmt
-
-LINT_TARGETS := lint lint-and-fix
-.PHONY: $(LINT_TARGETS) _lint
-$(LINT_TARGETS): _lint
-lint: ARGS=
-lint-and-fix: ARGS=--fix
-_lint:
-# Explicitly set OS to Linux to not skip *_linux.go files when running on macOS.
-# Uncloud daemon won't likely support OS other than Linux anytime soon, so for now we can rely on that.
-	GOOS=linux golangci-lint run $(ARGS)

api/pb/docker.pb.go

@@ -2259,6 +2259,137 @@ func (x *ServiceContainer) GetServiceSpec() []byte {
 	return nil
 }
 
+type UpdateServiceContainerRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	// Fields that are not set are left unchanged. CPU and memory limits can be changed but not removed.
+	// CPU limit in nanocores.
+	Cpu *int64 `protobuf:"varint,2,opt,name=cpu,proto3,oneof" json:"cpu,omitempty"`
+	// Memory limit in bytes.
+	Memory *int64 `protobuf:"varint,3,opt,name=memory,proto3,oneof" json:"memory,omitempty"`
+	// Memory reservation in bytes.
+	MemoryReservation *int64 `protobuf:"varint,4,opt,name=memory_reservation,json=memoryReservation,proto3,oneof" json:"memory_reservation,omitempty"`
+	// Service labels that replace all current service labels.
+	ServiceLabels *Labels `protobuf:"bytes,5,opt,name=service_labels,json=serviceLabels,proto3" json:"service_labels,omitempty"`
+}
+
+func (x *UpdateServiceContainerRequest) Reset() {
+	*x = UpdateServiceContainerRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_api_pb_docker_proto_msgTypes[38]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *UpdateServiceContainerRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*UpdateServiceContainerRequest) ProtoMessage() {}
+
+func (x *UpdateServiceContainerRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_api_pb_docker_proto_msgTypes[38]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use UpdateServiceContainerRequest.ProtoReflect.Descriptor instead.
+func (*UpdateServiceContainerRequest) Descriptor() ([]byte, []int) {
+	return file_api_pb_docker_proto_rawDescGZIP(), []int{38}
+}
+
+func (x *UpdateServiceContainerRequest) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *UpdateServiceContainerRequest) GetCpu() int64 {
+	if x != nil && x.Cpu != nil {
+		return *x.Cpu
+	}
+	return 0
+}
+
+func (x *UpdateServiceContainerRequest) GetMemory() int64 {
+	if x != nil && x.Memory != nil {
+		return *x.Memory
+	}
+	return 0
+}
+
+func (x *UpdateServiceContainerRequest) GetMemoryReservation() int64 {
+	if x != nil && x.MemoryReservation != nil {
+		return *x.MemoryReservation
+	}
+	return 0
+}
+
+func (x *UpdateServiceContainerRequest) GetServiceLabels() *Labels {
+	if x != nil {
+		return x.ServiceLabels
+	}
+	return nil
+}
+
+type Labels struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Labels map[string]string `protobuf:"bytes,1,rep,name=labels,proto3" json:"labels,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+}
+
+func (x *Labels) Reset() {
+	*x = Labels{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_api_pb_docker_proto_msgTypes[39]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Labels) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Labels) ProtoMessage() {}
+
+func (x *Labels) ProtoReflect() protoreflect.Message {
+	mi := &file_api_pb_docker_proto_msgTypes[39]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Labels.ProtoReflect.Descriptor instead.
+func (*Labels) Descriptor() ([]byte, []int) {
+	return file_api_pb_docker_proto_rawDescGZIP(), []int{39}
+}
+
+func (x *Labels) GetLabels() map[string]string {
+	if x != nil {
+		return x.Labels
+	}
+	return nil
+}
+
 type ListServiceContainersRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2272,7 +2403,7 @@ type ListServiceContainersRequest struct {
 func (x *ListServiceContainersRequest) Reset() {
 	*x = ListServiceContainersRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_pb_docker_proto_msgTypes[38]
+		mi := &file_api_pb_docker_proto_msgTypes[40]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2285,7 +2416,7 @@ func (x *ListServiceContainersRequest) String() string {
 func (*ListServiceContainersRequest) ProtoMessage() {}
 
 func (x *ListServiceContainersRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_api_pb_docker_proto_msgTypes[38]
+	mi := &file_api_pb_docker_proto_msgTypes[40]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2298,7 +2429,7 @@ func (x *ListServiceContainersRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListServiceContainersRequest.ProtoReflect.Descriptor instead.
 func (*ListServiceContainersRequest) Descriptor() ([]byte, []int) {
-	return file_api_pb_docker_proto_rawDescGZIP(), []int{38}
+	return file_api_pb_docker_proto_rawDescGZIP(), []int{40}
 }
 
 func (x *ListServiceContainersRequest) GetServiceId() string {
@@ -2328,7 +2459,7 @@ type ListServiceContainersResponse struct {
 func (x *ListServiceContainersResponse) Reset() {
 	*x = ListServiceContainersResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_pb_docker_proto_msgTypes[39]
+		mi := &file_api_pb_docker_proto_msgTypes[41]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2341,7 +2472,7 @@ func (x *ListServiceContainersResponse) String() string {
 func (*ListServiceContainersResponse) ProtoMessage() {}
 
 func (x *ListServiceContainersResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_api_pb_docker_proto_msgTypes[39]
+	mi := &file_api_pb_docker_proto_msgTypes[41]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2354,7 +2485,7 @@ func (x *ListServiceContainersResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListServiceContainersResponse.ProtoReflect.Descriptor instead.
 func (*ListServiceContainersResponse) Descriptor() ([]byte, []int) {
-	return file_api_pb_docker_proto_rawDescGZIP(), []int{39}
+	return file_api_pb_docker_proto_rawDescGZIP(), []int{41}
 }
 
 func (x *ListServiceContainersResponse) GetMessages() []*MachineServiceContainers {
@@ -2378,7 +2509,7 @@ type MachineServiceContainers struct {
 func (x *MachineServiceContainers) Reset() {
 	*x = MachineServiceContainers{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_pb_docker_proto_msgTypes[40]
+		mi := &file_api_pb_docker_proto_msgTypes[42]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2391,7 +2522,7 @@ func (x *MachineServiceContainers) String() string {
 func (*MachineServiceContainers) ProtoMessage() {}
 
 func (x *MachineServiceContainers) ProtoReflect() protoreflect.Message {
-	mi := &file_api_pb_docker_proto_msgTypes[40]
+	mi := &file_api_pb_docker_proto_msgTypes[42]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2404,7 +2535,7 @@ func (x *MachineServiceContainers) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use MachineServiceContainers.ProtoReflect.Descriptor instead.
 func (*MachineServiceContainers) Descriptor() ([]byte, []int) {
-	return file_api_pb_docker_proto_rawDescGZIP(), []int{40}
+	return file_api_pb_docker_proto_rawDescGZIP(), []int{42}
 }
 
 func (x *MachineServiceContainers) GetMetadata() *Metadata {
@@ -2638,125 +2769,153 @@ var file_api_pb_docker_proto_rawDesc = []byte{
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 }
 
 var (
@@ -2772,7 +2931,7 @@ func file_api_pb_docker_proto_rawDescGZIP() []byte {
 }
 
 var file_api_pb_docker_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_api_pb_docker_proto_msgTypes = make([]protoimpl.MessageInfo, 41)
+var file_api_pb_docker_proto_msgTypes = make([]protoimpl.MessageInfo, 44)
 var file_api_pb_docker_proto_goTypes = []any{
 	(CreateServiceContainerRequest_ContainerType)(0), // 0: api.CreateServiceContainerRequest.ContainerType
 	(*CreateContainerRequest)(nil),                   // 1: api.CreateContainerRequest
@@ -2813,81 +2972,88 @@ var file_api_pb_docker_proto_goTypes = []any{
 	(*RemoveVolumeRequest)(nil),                      // 36: api.RemoveVolumeRequest
 	(*CreateServiceContainerRequest)(nil),            // 37: api.CreateServiceContainerRequest
 	(*ServiceContainer)(nil),                         // 38: api.ServiceContainer
-	(*ListServiceContainersRequest)(nil),             // 39: api.ListServiceContainersRequest
-	(*ListServiceContainersResponse)(nil),            // 40: api.ListServiceContainersResponse
-	(*MachineServiceContainers)(nil),                 // 41: api.MachineServiceContainers
-	(*Metadata)(nil),                                 // 42: api.Metadata
-	(*LogsRequest)(nil),                              // 43: api.LogsRequest
-	(*emptypb.Empty)(nil),                            // 44: google.protobuf.Empty
-	(*LogEntry)(nil),                                 // 45: api.LogEntry
+	(*UpdateServiceContainerRequest)(nil),            // 39: api.UpdateServiceContainerRequest
+	(*Labels)(nil),                                   // 40: api.Labels
+	(*ListServiceContainersRequest)(nil),             // 41: api.ListServiceContainersRequest
+	(*ListServiceContainersResponse)(nil),            // 42: api.ListServiceContainersResponse
+	(*MachineServiceContainers)(nil),                 // 43: api.MachineServiceContainers
+	nil,                                              // 44: api.Labels.LabelsEntry
+	(*Metadata)(nil),                                 // 45: api.Metadata
+	(*LogsRequest)(nil),                              // 46: api.LogsRequest
+	(*emptypb.Empty)(nil),                            // 47: google.protobuf.Empty
+	(*LogEntry)(nil),                                 // 48: api.LogEntry
 }
 var file_api_pb_docker_proto_depIdxs = []int32{
 	9,  // 0: api.ListContainersResponse.messages:type_name -> api.MachineContainers
-	42, // 1: api.MachineContainers.metadata:type_name -> api.Metadata
+	45, // 1: api.MachineContainers.metadata:type_name -> api.Metadata
 	12, // 2: api.ExecContainerRequest.config:type_name -> api.ExecConfig
 	13, // 3: api.ExecContainerRequest.resize:type_name -> api.ResizeEvent
 	19, // 4: api.InspectImageResponse.messages:type_name -> api.Image
-	42, // 5: api.Image.metadata:type_name -> api.Metadata
+	45, // 5: api.Image.metadata:type_name -> api.Metadata
 	22, // 6: api.InspectRemoteImageResponse.messages:type_name -> api.RemoteImage
-	42, // 7: api.RemoteImage.metadata:type_name -> api.Metadata
+	45, // 7: api.RemoteImage.metadata:type_name -> api.Metadata
 	25, // 8: api.RemoveImageRequest.platforms:type_name -> api.ImagePlatform
 	27, // 9: api.RemoveImageResponse.messages:type_name -> api.MachineImageRemoval
-	42, // 10: api.MachineImageRemoval.metadata:type_name -> api.Metadata
+	45, // 10: api.MachineImageRemoval.metadata:type_name -> api.Metadata
 	28, // 11: api.MachineImageRemoval.results:type_name -> api.ImageRemoval
 	30, // 12: api.ListImagesResponse.messages:type_name -> api.MachineImages
-	42, // 13: api.MachineImages.metadata:type_name -> api.Metadata
+	45, // 13: api.MachineImages.metadata:type_name -> api.Metadata
 	35, // 14: api.ListVolumesResponse.messages:type_name -> api.MachineVolumes
-	42, // 15: api.MachineVolumes.metadata:type_name -> api.Metadata
+	45, // 15: api.MachineVolumes.metadata:type_name -> api.Metadata
 	0,  // 16: api.CreateServiceContainerRequest.container_type:type_name -> api.CreateServiceContainerRequest.ContainerType
-	41, // 17: api.ListServiceContainersResponse.messages:type_name -> api.MachineServiceContainers
-	42, // 18: api.MachineServiceContainers.metadata:type_name -> api.Metadata
-	38, // 19: api.MachineServiceContainers.containers:type_name -> api.ServiceContainer
-	38, // 20: api.MachineServiceContainers.hook_containers:type_name -> api.ServiceContainer
-	1,  // 21: api.Docker.CreateContainer:input_type -> api.CreateContainerRequest
-	3,  // 22: api.Docker.InspectContainer:input_type -> api.InspectContainerRequest
-	5,  // 23: api.Docker.StartContainer:input_type -> api.StartContainerRequest
-	6,  // 24: api.Docker.StopContainer:input_type -> api.StopContainerRequest
-	7,  // 25: api.Docker.ListContainers:input_type -> api.ListContainersRequest
-	10, // 26: api.Docker.RemoveContainer:input_type -> api.RemoveContainerRequest
-	11, // 27: api.Docker.ExecContainer:input_type -> api.ExecContainerRequest
-	43, // 28: api.Docker.ContainerLogs:input_type -> api.LogsRequest
-	15, // 29: api.Docker.PullImage:input_type -> api.PullImageRequest
-	17, // 30: api.Docker.InspectImage:input_type -> api.InspectImageRequest
-	20, // 31: api.Docker.InspectRemoteImage:input_type -> api.InspectRemoteImageRequest
-	23, // 32: api.Docker.ListImages:input_type -> api.ListImagesRequest
-	24, // 33: api.Docker.RemoveImage:input_type -> api.RemoveImageRequest
-	31, // 34: api.Docker.CreateVolume:input_type -> api.CreateVolumeRequest
-	33, // 35: api.Docker.ListVolumes:input_type -> api.ListVolumesRequest
-	36, // 36: api.Docker.RemoveVolume:input_type -> api.RemoveVolumeRequest
-	37, // 37: api.Docker.CreateServiceContainer:input_type -> api.CreateServiceContainerRequest
-	3,  // 38: api.Docker.InspectServiceContainer:input_type -> api.InspectContainerRequest
-	39, // 39: api.Docker.ListServiceContainers:input_type -> api.ListServiceContainersRequest
-	10, // 40: api.Docker.RemoveServiceContainer:input_type -> api.RemoveContainerRequest
-	2,  // 41: api.Docker.CreateContainer:output_type -> api.CreateContainerResponse
-	4,  // 42: api.Docker.InspectContainer:output_type -> api.InspectContainerResponse
-	44, // 43: api.Docker.StartContainer:output_type -> google.protobuf.Empty
-	44, // 44: api.Docker.StopContainer:output_type -> google.protobuf.Empty
-	8,  // 45: api.Docker.ListContainers:output_type -> api.ListContainersResponse
-	44, // 46: api.Docker.RemoveContainer:output_type -> google.protobuf.Empty
-	14, // 47: api.Docker.ExecContainer:output_type -> api.ExecContainerResponse
-	45, // 48: api.Docker.ContainerLogs:output_type -> api.LogEntry
-	16, // 49: api.Docker.PullImage:output_type -> api.JSONMessage
-	18, // 50: api.Docker.InspectImage:output_type -> api.InspectImageResponse
-	21, // 51: api.Docker.InspectRemoteImage:output_type -> api.InspectRemoteImageResponse
-	29, // 52: api.Docker.ListImages:output_type -> api.ListImagesResponse
-	26, // 53: api.Docker.RemoveImage:output_type -> api.RemoveImageResponse
-	32, // 54: api.Docker.CreateVolume:output_type -> api.CreateVolumeResponse
-	34, // 55: api.Docker.ListVolumes:output_type -> api.ListVolumesResponse
-	44, // 56: api.Docker.RemoveVolume:output_type -> google.protobuf.Empty
-	2,  // 57: api.Docker.CreateServiceContainer:output_type -> api.CreateContainerResponse
-	38, // 58: api.Docker.InspectServiceContainer:output_type -> api.ServiceContainer
-	40, // 59: api.Docker.ListServiceContainers:output_type -> api.ListServiceContainersResponse
-	44, // 60: api.Docker.RemoveServiceContainer:output_type -> google.protobuf.Empty
-	41, // [41:61] is the sub-list for method output_type
-	21, // [21:41] is the sub-list for method input_type
-	21, // [21:21] is the sub-list for extension type_name
-	21, // [21:21] is the sub-list for extension extendee
-	0,  // [0:21] is the sub-list for field type_name
+	40, // 17: api.UpdateServiceContainerRequest.service_labels:type_name -> api.Labels
+	44, // 18: api.Labels.labels:type_name -> api.Labels.LabelsEntry
+	43, // 19: api.ListServiceContainersResponse.messages:type_name -> api.MachineServiceContainers
+	45, // 20: api.MachineServiceContainers.metadata:type_name -> api.Metadata
+	38, // 21: api.MachineServiceContainers.containers:type_name -> api.ServiceContainer
+	38, // 22: api.MachineServiceContainers.hook_containers:type_name -> api.ServiceContainer
+	1,  // 23: api.Docker.CreateContainer:input_type -> api.CreateContainerRequest
+	3,  // 24: api.Docker.InspectContainer:input_type -> api.InspectContainerRequest
+	5,  // 25: api.Docker.StartContainer:input_type -> api.StartContainerRequest
+	6,  // 26: api.Docker.StopContainer:input_type -> api.StopContainerRequest
+	7,  // 27: api.Docker.ListContainers:input_type -> api.ListContainersRequest
+	10, // 28: api.Docker.RemoveContainer:input_type -> api.RemoveContainerRequest
+	11, // 29: api.Docker.ExecContainer:input_type -> api.ExecContainerRequest
+	46, // 30: api.Docker.ContainerLogs:input_type -> api.LogsRequest
+	15, // 31: api.Docker.PullImage:input_type -> api.PullImageRequest
+	17, // 32: api.Docker.InspectImage:input_type -> api.InspectImageRequest
+	20, // 33: api.Docker.InspectRemoteImage:input_type -> api.InspectRemoteImageRequest
+	23, // 34: api.Docker.ListImages:input_type -> api.ListImagesRequest
+	24, // 35: api.Docker.RemoveImage:input_type -> api.RemoveImageRequest
+	31, // 36: api.Docker.CreateVolume:input_type -> api.CreateVolumeRequest
+	33, // 37: api.Docker.ListVolumes:input_type -> api.ListVolumesRequest
+	36, // 38: api.Docker.RemoveVolume:input_type -> api.RemoveVolumeRequest
+	37, // 39: api.Docker.CreateServiceContainer:input_type -> api.CreateServiceContainerRequest
+	3,  // 40: api.Docker.InspectServiceContainer:input_type -> api.InspectContainerRequest
+	39, // 41: api.Docker.UpdateServiceContainer:input_type -> api.UpdateServiceContainerRequest
+	41, // 42: api.Docker.ListServiceContainers:input_type -> api.ListServiceContainersRequest
+	10, // 43: api.Docker.RemoveServiceContainer:input_type -> api.RemoveContainerRequest
+	2,  // 44: api.Docker.CreateContainer:output_type -> api.CreateContainerResponse
+	4,  // 45: api.Docker.InspectContainer:output_type -> api.InspectContainerResponse
+	47, // 46: api.Docker.StartContainer:output_type -> google.protobuf.Empty
+	47, // 47: api.Docker.StopContainer:output_type -> google.protobuf.Empty
+	8,  // 48: api.Docker.ListContainers:output_type -> api.ListContainersResponse
+	47, // 49: api.Docker.RemoveContainer:output_type -> google.protobuf.Empty
+	14, // 50: api.Docker.ExecContainer:output_type -> api.ExecContainerResponse
+	48, // 51: api.Docker.ContainerLogs:output_type -> api.LogEntry
+	16, // 52: api.Docker.PullImage:output_type -> api.JSONMessage
+	18, // 53: api.Docker.InspectImage:output_type -> api.InspectImageResponse
+	21, // 54: api.Docker.InspectRemoteImage:output_type -> api.InspectRemoteImageResponse
+	29, // 55: api.Docker.ListImages:output_type -> api.ListImagesResponse
+	26, // 56: api.Docker.RemoveImage:output_type -> api.RemoveImageResponse
+	32, // 57: api.Docker.CreateVolume:output_type -> api.CreateVolumeResponse
+	34, // 58: api.Docker.ListVolumes:output_type -> api.ListVolumesResponse
+	47, // 59: api.Docker.RemoveVolume:output_type -> google.protobuf.Empty
+	2,  // 60: api.Docker.CreateServiceContainer:output_type -> api.CreateContainerResponse
+	38, // 61: api.Docker.InspectServiceContainer:output_type -> api.ServiceContainer
+	47, // 62: api.Docker.UpdateServiceContainer:output_type -> google.protobuf.Empty
+	42, // 63: api.Docker.ListServiceContainers:output_type -> api.ListServiceContainersResponse
+	47, // 64: api.Docker.RemoveServiceContainer:output_type -> google.protobuf.Empty
+	44, // [44:65] is the sub-list for method output_type
+	23, // [23:44] is the sub-list for method input_type
+	23, // [23:23] is the sub-list for extension type_name
+	23, // [23:23] is the sub-list for extension extendee
+	0,  // [0:23] is the sub-list for field type_name
 }
 
 func init() { file_api_pb_docker_proto_init() }
@@ -3354,7 +3520,7 @@ func file_api_pb_docker_proto_init() {
 			}
 		}
 		file_api_pb_docker_proto_msgTypes[38].Exporter = func(v any, i int) any {
-			switch v := v.(*ListServiceContainersRequest); i {
+			switch v := v.(*UpdateServiceContainerRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3366,7 +3532,7 @@ func file_api_pb_docker_proto_init() {
 			}
 		}
 		file_api_pb_docker_proto_msgTypes[39].Exporter = func(v any, i int) any {
-			switch v := v.(*ListServiceContainersResponse); i {
+			switch v := v.(*Labels); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3378,6 +3544,30 @@ func file_api_pb_docker_proto_init() {
 			}
 		}
 		file_api_pb_docker_proto_msgTypes[40].Exporter = func(v any, i int) any {
+			switch v := v.(*ListServiceContainersRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_api_pb_docker_proto_msgTypes[41].Exporter = func(v any, i int) any {
+			switch v := v.(*ListServiceContainersResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_api_pb_docker_proto_msgTypes[42].Exporter = func(v any, i int) any {
 			switch v := v.(*MachineServiceContainers); i {
 			case 0:
 				return &v.state
@@ -3401,13 +3591,14 @@ func file_api_pb_docker_proto_init() {
 		(*ExecContainerResponse_Stderr)(nil),
 		(*ExecContainerResponse_ExitCode)(nil),
 	}
+	file_api_pb_docker_proto_msgTypes[38].OneofWrappers = []any{}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_api_pb_docker_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   41,
+			NumMessages:   44,
 			NumExtensions: 0,
 			NumServices:   1,
 		},

api/pb/docker.proto

@@ -32,6 +32,8 @@ service Docker {
 
   rpc CreateServiceContainer(CreateServiceContainerRequest) returns (CreateContainerResponse);
   rpc InspectServiceContainer(InspectContainerRequest) returns (ServiceContainer);
+  // UpdateServiceContainer updates the requested properties of a service container in place without recreating it.
+  rpc UpdateServiceContainer(UpdateServiceContainerRequest) returns (google.protobuf.Empty);
   rpc ListServiceContainers(ListServiceContainersRequest) returns (ListServiceContainersResponse);
   rpc RemoveServiceContainer(RemoveContainerRequest) returns (google.protobuf.Empty);
 }
@@ -281,6 +283,23 @@ message ServiceContainer {
   bytes service_spec = 2;
 }
 
+message UpdateServiceContainerRequest {
+  string id = 1;
+  // Fields that are not set are left unchanged. CPU and memory limits can be changed but not removed.
+  // CPU limit in nanocores.
+  optional int64 cpu = 2;
+  // Memory limit in bytes.
+  optional int64 memory = 3;
+  // Memory reservation in bytes.
+  optional int64 memory_reservation = 4;
+  // Service labels that replace all current service labels.
+  Labels service_labels = 5;
+}
+
+message Labels {
+  map<string, string> labels = 1;
+}
+
 message ListServiceContainersRequest {
   string service_id = 1;
   // JSON serialised container.ListOptions.

api/pb/docker_grpc.pb.go

@@ -38,6 +38,7 @@ const (
 	Docker_RemoveVolume_FullMethodName            = "/api.Docker/RemoveVolume"
 	Docker_CreateServiceContainer_FullMethodName  = "/api.Docker/CreateServiceContainer"
 	Docker_InspectServiceContainer_FullMethodName = "/api.Docker/InspectServiceContainer"
+	Docker_UpdateServiceContainer_FullMethodName  = "/api.Docker/UpdateServiceContainer"
 	Docker_ListServiceContainers_FullMethodName   = "/api.Docker/ListServiceContainers"
 	Docker_RemoveServiceContainer_FullMethodName  = "/api.Docker/RemoveServiceContainer"
 )
@@ -66,6 +67,8 @@ type DockerClient interface {
 	RemoveVolume(ctx context.Context, in *RemoveVolumeRequest, opts ...grpc.CallOption) (*emptypb.Empty, error)
 	CreateServiceContainer(ctx context.Context, in *CreateServiceContainerRequest, opts ...grpc.CallOption) (*CreateContainerResponse, error)
 	InspectServiceContainer(ctx context.Context, in *InspectContainerRequest, opts ...grpc.CallOption) (*ServiceContainer, error)
+	// UpdateServiceContainer updates the requested properties of a service container in place without recreating it.
+	UpdateServiceContainer(ctx context.Context, in *UpdateServiceContainerRequest, opts ...grpc.CallOption) (*emptypb.Empty, error)
 	ListServiceContainers(ctx context.Context, in *ListServiceContainersRequest, opts ...grpc.CallOption) (*ListServiceContainersResponse, error)
 	RemoveServiceContainer(ctx context.Context, in *RemoveContainerRequest, opts ...grpc.CallOption) (*emptypb.Empty, error)
 }
@@ -279,6 +282,16 @@ func (c *dockerClient) InspectServiceContainer(ctx context.Context, in *InspectC
 	return out, nil
 }
 
+func (c *dockerClient) UpdateServiceContainer(ctx context.Context, in *UpdateServiceContainerRequest, opts ...grpc.CallOption) (*emptypb.Empty, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(emptypb.Empty)
+	err := c.cc.Invoke(ctx, Docker_UpdateServiceContainer_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *dockerClient) ListServiceContainers(ctx context.Context, in *ListServiceContainersRequest, opts ...grpc.CallOption) (*ListServiceContainersResponse, error) {
 	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
 	out := new(ListServiceContainersResponse)
@@ -323,6 +336,8 @@ type DockerServer interface {
 	RemoveVolume(context.Context, *RemoveVolumeRequest) (*emptypb.Empty, error)
 	CreateServiceContainer(context.Context, *CreateServiceContainerRequest) (*CreateContainerResponse, error)
 	InspectServiceContainer(context.Context, *InspectContainerRequest) (*ServiceContainer, error)
+	// UpdateServiceContainer updates the requested properties of a service container in place without recreating it.
+	UpdateServiceContainer(context.Context, *UpdateServiceContainerRequest) (*emptypb.Empty, error)
 	ListServiceContainers(context.Context, *ListServiceContainersRequest) (*ListServiceContainersResponse, error)
 	RemoveServiceContainer(context.Context, *RemoveContainerRequest) (*emptypb.Empty, error)
 	mustEmbedUnimplementedDockerServer()
@@ -389,6 +404,9 @@ func (UnimplementedDockerServer) CreateServiceContainer(context.Context, *Create
 func (UnimplementedDockerServer) InspectServiceContainer(context.Context, *InspectContainerRequest) (*ServiceContainer, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method InspectServiceContainer not implemented")
 }
+func (UnimplementedDockerServer) UpdateServiceContainer(context.Context, *UpdateServiceContainerRequest) (*emptypb.Empty, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method UpdateServiceContainer not implemented")
+}
 func (UnimplementedDockerServer) ListServiceContainers(context.Context, *ListServiceContainersRequest) (*ListServiceContainersResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ListServiceContainers not implemented")
 }
@@ -715,6 +733,24 @@ func _Docker_InspectServiceContainer_Handler(srv interface{}, ctx context.Contex
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Docker_UpdateServiceContainer_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(UpdateServiceContainerRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DockerServer).UpdateServiceContainer(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: Docker_UpdateServiceContainer_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DockerServer).UpdateServiceContainer(ctx, req.(*UpdateServiceContainerRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _Docker_ListServiceContainers_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(ListServiceContainersRequest)
 	if err := dec(in); err != nil {
@@ -818,6 +854,10 @@ var Docker_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "InspectServiceContainer",
 			Handler:    _Docker_InspectServiceContainer_Handler,
 		},
+		{
+			MethodName: "UpdateServiceContainer",
+			Handler:    _Docker_UpdateServiceContainer_Handler,
+		},
 		{
 			MethodName: "ListServiceContainers",
 			Handler:    _Docker_ListServiceContainers_Handler,

cmd/uc/service/inspect.go

@@ -3,6 +3,7 @@ package service
 import (
 	"context"
 	"fmt"
+	"maps"
 	"slices"
 	"time"
 
@@ -58,6 +59,16 @@ func inspect(ctx context.Context, uncli *cli.CLI, opts inspectOptions) error {
 	fmt.Printf("Service ID: %s\n", svc.ID)
 	fmt.Printf("Name:       %s\n", svc.Name)
 	fmt.Printf("Mode:       %s\n", svc.Mode)
+
+	spec := svc.Spec()
+	if len(spec.Labels) > 0 {
+		fmt.Println("Labels:")
+		printLabels(spec.Labels)
+	}
+	if len(spec.Container.Labels) > 0 {
+		fmt.Println("Container labels:")
+		printLabels(spec.Container.Labels)
+	}
 	fmt.Println()
 
 	// Combine regular and hook containers.
@@ -130,3 +141,10 @@ func inspect(ctx context.Context, uncli *cli.CLI, opts inspectOptions) error {
 	lipgloss.Println(t)
 	return nil
 }
+
+// printLabels prints the labels sorted by key followed by a blank line.
+func printLabels(labels map[string]string) {
+	for _, key := range slices.Sorted(maps.Keys(labels)) {
+		lipgloss.Println("  " + key + tui.Faint.Render("=") + labels[key])
+	}
+}

cmd/uc/service/root.go

@@ -20,6 +20,7 @@ func NewRootCommand() *cobra.Command {
 		NewScaleCommand(""),
 		NewStartCommand(""),
 		NewStopCommand(""),
+		NewUpdateCommand(),
 	)
 	return cmd
 }

cmd/uc/service/run.go

@@ -21,13 +21,16 @@ import (
 type runOptions struct {
 	caddyfile         string
 	command           []string
+	containerLabels   []string
 	cpu               dockeropts.NanoCPUs
 	entrypoint        string
 	entrypointChanged bool
 	env               []string
 	image             string
+	labels            []string
 	machines          []string
 	memory            dockeropts.MemBytes
+	memoryReservation dockeropts.MemBytes
 	mode              string
 	shmSize           dockeropts.MemBytes
 	name              string
@@ -64,6 +67,9 @@ func NewRunCommand(groupID string) *cobra.Command {
 	cmd.Flags().StringVar(&opts.caddyfile, "caddyfile", "",
 		"Path to a custom Caddy config (Caddyfile) for the service. "+
 			"Cannot be used together with non-@host published ports.")
+	cmd.Flags().StringArrayVar(&opts.containerLabels, "container-label", nil,
+		"Set a Docker label on service containers. Can be specified multiple times.\n"+
+			"Format: key=value or just key for an empty value.")
 	cmd.Flags().VarP(&opts.cpu, "cpu", "",
 		"Maximum number of CPU cores a service container can use. Fractional values are allowed: "+
 			"0.5 for half a core or 2.25 for two and a quarter cores.")
@@ -72,6 +78,9 @@ func NewRunCommand(groupID string) *cobra.Command {
 	cmd.Flags().StringSliceVarP(&opts.env, "env", "e", nil,
 		"Set an environment variable for service containers. Can be specified multiple times.\n"+
 			"Format: VAR=value or just VAR to use the value from the local environment.")
+	cmd.Flags().StringArrayVarP(&opts.labels, "label", "l", nil,
+		"Set a service label. Service labels aren't applied to Docker containers, use --container-label for that.\n"+
+			"Can be specified multiple times. Format: key=value or just key for an empty value.")
 	cmd.Flags().StringVar(&opts.mode, "mode", api.ServiceModeReplicated,
 		fmt.Sprintf("Replication mode of the service: either '%s' (a specified number of containers across "+
 			"the machines) or '%s' (one container on every machine).",
@@ -83,6 +92,9 @@ func NewRunCommand(groupID string) *cobra.Command {
 		"Maximum amount of memory a service container can use. Value is a positive integer with optional unit suffix (b, k, m, g).\n"+
 			"Default unit is bytes if no suffix specified.\n"+
 			"Examples: 1073741824, 1024m, 1g (all equal 1 gibibyte)")
+	cmd.Flags().Var(&opts.memoryReservation, "memory-reservation",
+		"Minimum amount of memory reserved for a service container. Value is a positive integer with optional unit suffix (b, k, m, g).\n"+
+			"Default unit is bytes if no suffix specified.")
 	cmd.Flags().VarP(&opts.shmSize, "shm-size", "",
 		"Maximum amount of shared memory (mounted at /dev/shm) a service container can use. Value is a positive integer\n"+
 			"with optional unit suffix (b, k, m, g). Default unit is bytes if no suffix specified.\n"+
@@ -192,6 +204,15 @@ func prepareServiceSpec(opts runOptions) (api.ServiceSpec, error) {
 		return spec, err
 	}
 
+	labels, err := parseLabels(opts.labels)
+	if err != nil {
+		return spec, err
+	}
+	containerLabels, err := parseLabels(opts.containerLabels)
+	if err != nil {
+		return spec, err
+	}
+
 	switch opts.mode {
 	case api.ServiceModeReplicated, api.ServiceModeGlobal:
 	default:
@@ -232,17 +253,20 @@ func prepareServiceSpec(opts runOptions) (api.ServiceSpec, error) {
 			Command:    opts.command,
 			Env:        env,
 			Image:      opts.image,
+			Labels:     containerLabels,
 			Privileged: opts.privileged,
 			PullPolicy: opts.pull,
 			Resources: api.ContainerResources{
-				CPU:          opts.cpu.Value(),
-				Memory:       opts.memory.Value(),
-				SharedMemory: opts.shmSize.Value(),
-				Ulimits:      ulimits,
+				CPU:               opts.cpu.Value(),
+				Memory:            opts.memory.Value(),
+				MemoryReservation: opts.memoryReservation.Value(),
+				SharedMemory:      opts.shmSize.Value(),
+				Ulimits:           ulimits,
 			},
 			User:         opts.user,
 			VolumeMounts: mounts,
 		},
+		Labels:    labels,
 		Mode:      opts.mode,
 		Name:      opts.name,
 		Placement: placement,
@@ -301,6 +325,24 @@ func parseEnv(env []string) (api.EnvVars, error) {
 	return envVars, nil
 }
 
+// parseLabels parses labels from the command line arguments in the format "key=value" or just "key" for an empty value.
+func parseLabels(labels []string) (map[string]string, error) {
+	if len(labels) == 0 {
+		return nil, nil
+	}
+
+	result := make(map[string]string, len(labels))
+	for _, label := range labels {
+		key, value, _ := strings.Cut(label, "=")
+		if strings.TrimSpace(key) == "" {
+			return nil, fmt.Errorf("invalid label '%s': key must not be empty", label)
+		}
+		result[key] = value
+	}
+
+	return result, nil
+}
+
 // parseVolumeFlags parses volume flag values in Docker CLI format and returns VolumeSpecs and VolumeMounts.
 // It handles both named volumes (volume_name:/container/path[:ro|volume-nocopy])
 // and bind mounts (/host/path:/container/path[:ro]).

cmd/uc/service/run_test.go

@@ -0,0 +1,423 @@
+package service
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/docker/go-units"
+	"github.com/psviderski/uncloud/pkg/api"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// validRunOptions returns the minimal options that produce a valid service spec.
+func validRunOptions() runOptions {
+	return runOptions{
+		image:    "nginx:1.27",
+		name:     "web",
+		mode:     api.ServiceModeReplicated,
+		pull:     api.PullPolicyMissing,
+		replicas: 1,
+	}
+}
+
+func TestParseLabels(t *testing.T) {
+	t.Parallel()
+
+	labels, err := parseLabels(nil)
+	require.NoError(t, err)
+	assert.Nil(t, labels)
+
+	labels, err = parseLabels([]string{"tier=frontend", "empty", "list=a,b", "expr=a=b", "tier=backend"})
+	require.NoError(t, err)
+	assert.Equal(t, map[string]string{
+		"tier":  "backend",
+		"empty": "",
+		"list":  "a,b",
+		"expr":  "a=b",
+	}, labels)
+
+	_, err = parseLabels([]string{"=value"})
+	require.ErrorContains(t, err, "key must not be empty")
+
+	_, err = parseLabels([]string{" \t =value"})
+	require.ErrorContains(t, err, "key must not be empty")
+
+	labels, err = parseLabels([]string{"key=value with spaces"})
+	require.NoError(t, err)
+	assert.Equal(t, map[string]string{"key": "value with spaces"}, labels)
+}
+
+func TestPrepareServiceSpec(t *testing.T) {
+	t.Parallel()
+
+	t.Run("minimal options", func(t *testing.T) {
+		t.Parallel()
+
+		spec, err := prepareServiceSpec(validRunOptions())
+		require.NoError(t, err)
+
+		assert.Equal(t, "web", spec.Name)
+		assert.Equal(t, api.ServiceModeReplicated, spec.Mode)
+		assert.EqualValues(t, 1, spec.Replicas)
+		assert.Equal(t, "nginx:1.27", spec.Container.Image)
+		assert.Equal(t, api.PullPolicyMissing, spec.Container.PullPolicy)
+		assert.Nil(t, spec.Caddy)
+		assert.Nil(t, spec.Labels)
+		assert.Nil(t, spec.Container.Labels)
+		assert.Nil(t, spec.Container.Entrypoint)
+		assert.Nil(t, spec.Container.Resources.Ulimits)
+		assert.Nil(t, spec.Placement.Machines)
+		assert.Empty(t, spec.Container.Env)
+		assert.Empty(t, spec.Ports)
+		assert.Empty(t, spec.Volumes)
+		assert.Empty(t, spec.Container.VolumeMounts)
+	})
+
+	t.Run("all options", func(t *testing.T) {
+		t.Parallel()
+
+		opts := validRunOptions()
+		opts.command = []string{"nginx", "-g", "daemon off;"}
+		opts.env = []string{"FOO=bar", "EMPTY=", "EXPR=a=b"}
+		opts.labels = []string{"tier=frontend"}
+		opts.containerLabels = []string{"logging=enabled"}
+		opts.machines = []string{"m1,m2", "m3"}
+		opts.privileged = true
+		opts.pull = api.PullPolicyAlways
+		opts.publish = []string{"app.example.com:8080/https", "53:5353/udp@host"}
+		opts.replicas = 3
+		opts.ulimits = []string{"nofile=1024:2048", "nproc=65535"}
+		opts.user = "1000:1000"
+		opts.volumes = []string{"data:/var/lib/data:ro"}
+		require.NoError(t, opts.cpu.Set("0.5"))
+		require.NoError(t, opts.memory.Set("128m"))
+		require.NoError(t, opts.memoryReservation.Set("32m"))
+		require.NoError(t, opts.shmSize.Set("64m"))
+
+		spec, err := prepareServiceSpec(opts)
+		require.NoError(t, err)
+
+		assert.Equal(t, api.ServiceSpec{
+			Container: api.ContainerSpec{
+				Command:    []string{"nginx", "-g", "daemon off;"},
+				Env:        api.EnvVars{"FOO": "bar", "EMPTY": "", "EXPR": "a=b"},
+				Image:      "nginx:1.27",
+				Labels:     map[string]string{"logging": "enabled"},
+				Privileged: true,
+				PullPolicy: api.PullPolicyAlways,
+				Resources: api.ContainerResources{
+					CPU:               500 * api.MilliCore,
+					Memory:            128 * units.MiB,
+					MemoryReservation: 32 * units.MiB,
+					SharedMemory:      64 * units.MiB,
+					Ulimits: map[string]api.Ulimit{
+						"nofile": {Soft: 1024, Hard: 2048},
+						"nproc":  {Soft: 65535, Hard: 65535},
+					},
+				},
+				User: "1000:1000",
+				VolumeMounts: []api.VolumeMount{
+					{VolumeName: "data", ContainerPath: "/var/lib/data", ReadOnly: true},
+				},
+			},
+			Labels:    map[string]string{"tier": "frontend"},
+			Mode:      api.ServiceModeReplicated,
+			Name:      "web",
+			Placement: api.Placement{Machines: []string{"m1", "m2", "m3"}},
+			Ports: []api.PortSpec{
+				{
+					Hostname:      "app.example.com",
+					ContainerPort: 8080,
+					Protocol:      api.ProtocolHTTPS,
+					Mode:          api.PortModeIngress,
+				},
+				{
+					PublishedPort: 53,
+					ContainerPort: 5353,
+					Protocol:      api.ProtocolUDP,
+					Mode:          api.PortModeHost,
+				},
+			},
+			Replicas: 3,
+			Volumes: []api.VolumeSpec{
+				{
+					Name:          "data",
+					Type:          api.VolumeTypeVolume,
+					VolumeOptions: &api.VolumeOptions{Name: "data"},
+				},
+			},
+		}, spec)
+	})
+
+	t.Run("generates a name when not specified", func(t *testing.T) {
+		t.Parallel()
+
+		opts := validRunOptions()
+		opts.name = ""
+		opts.image = "bitnami/nginx:latest"
+
+		spec, err := prepareServiceSpec(opts)
+		require.NoError(t, err)
+		assert.Regexp(t, `^nginx-[a-z0-9]{4}$`, spec.Name)
+	})
+
+	t.Run("keeps the specified name", func(t *testing.T) {
+		t.Parallel()
+
+		opts := validRunOptions()
+		opts.name = "custom"
+
+		spec, err := prepareServiceSpec(opts)
+		require.NoError(t, err)
+		assert.Equal(t, "custom", spec.Name)
+	})
+
+	t.Run("global mode", func(t *testing.T) {
+		t.Parallel()
+
+		opts := validRunOptions()
+		opts.mode = api.ServiceModeGlobal
+
+		spec, err := prepareServiceSpec(opts)
+		require.NoError(t, err)
+		assert.Equal(t, api.ServiceModeGlobal, spec.Mode)
+	})
+
+	t.Run("entrypoint", func(t *testing.T) {
+		t.Parallel()
+
+		opts := validRunOptions()
+		opts.entrypoint = "/bin/sh"
+		opts.entrypointChanged = true
+		spec, err := prepareServiceSpec(opts)
+		require.NoError(t, err)
+		assert.Equal(t, []string{"/bin/sh"}, spec.Container.Entrypoint)
+
+		// An explicitly empty entrypoint resets the one from the image.
+		opts = validRunOptions()
+		opts.entrypointChanged = true
+		spec, err = prepareServiceSpec(opts)
+		require.NoError(t, err)
+		assert.Equal(t, []string{""}, spec.Container.Entrypoint)
+	})
+
+	t.Run("env without a value is omitted when not set locally", func(t *testing.T) {
+		t.Parallel()
+
+		opts := validRunOptions()
+		opts.env = []string{"UNCLOUD_TEST_ENV_THAT_IS_NOT_SET"}
+
+		spec, err := prepareServiceSpec(opts)
+		require.NoError(t, err)
+		assert.NotContains(t, spec.Container.Env, "UNCLOUD_TEST_ENV_THAT_IS_NOT_SET")
+	})
+
+	t.Run("bind mount", func(t *testing.T) {
+		t.Parallel()
+
+		opts := validRunOptions()
+		opts.volumes = []string{"/data/uploads:/app/uploads"}
+
+		spec, err := prepareServiceSpec(opts)
+		require.NoError(t, err)
+
+		require.Len(t, spec.Volumes, 1)
+		assert.Regexp(t, `^bind-[a-z0-9]{4}$`, spec.Volumes[0].Name)
+		assert.Equal(t, api.VolumeTypeBind, spec.Volumes[0].Type)
+		require.NotNil(t, spec.Volumes[0].BindOptions)
+		assert.Equal(t, "/data/uploads", spec.Volumes[0].BindOptions.HostPath)
+		assert.True(t, spec.Volumes[0].BindOptions.CreateHostPath)
+
+		require.Len(t, spec.Container.VolumeMounts, 1)
+		assert.Equal(t, spec.Volumes[0].Name, spec.Container.VolumeMounts[0].VolumeName)
+		assert.Equal(t, "/app/uploads", spec.Container.VolumeMounts[0].ContainerPath)
+	})
+
+	t.Run("named volume mounted twice creates one volume", func(t *testing.T) {
+		t.Parallel()
+
+		opts := validRunOptions()
+		opts.volumes = []string{"data:/a", "data:/b"}
+
+		spec, err := prepareServiceSpec(opts)
+		require.NoError(t, err)
+		assert.Len(t, spec.Volumes, 1)
+		assert.Len(t, spec.Container.VolumeMounts, 2)
+	})
+
+	t.Run("caddyfile content is trimmed", func(t *testing.T) {
+		t.Parallel()
+
+		path := filepath.Join(t.TempDir(), "Caddyfile")
+		require.NoError(t, os.WriteFile(path, []byte("\nexample.com {\n}\n\n"), 0o600))
+
+		opts := validRunOptions()
+		opts.caddyfile = path
+
+		spec, err := prepareServiceSpec(opts)
+		require.NoError(t, err)
+		require.NotNil(t, spec.Caddy)
+		assert.Equal(t, "example.com {\n}", spec.Caddy.Config)
+	})
+
+	t.Run("empty caddyfile is ignored", func(t *testing.T) {
+		t.Parallel()
+
+		path := filepath.Join(t.TempDir(), "Caddyfile")
+		require.NoError(t, os.WriteFile(path, []byte(" \n"), 0o600))
+
+		opts := validRunOptions()
+		opts.caddyfile = path
+
+		spec, err := prepareServiceSpec(opts)
+		require.NoError(t, err)
+		assert.Nil(t, spec.Caddy)
+	})
+
+	t.Run("caddyfile can be used with host ports", func(t *testing.T) {
+		t.Parallel()
+
+		path := filepath.Join(t.TempDir(), "Caddyfile")
+		require.NoError(t, os.WriteFile(path, []byte("example.com {\n}"), 0o600))
+
+		opts := validRunOptions()
+		opts.caddyfile = path
+		opts.publish = []string{"53:5353/udp@host"}
+
+		_, err := prepareServiceSpec(opts)
+		require.NoError(t, err)
+	})
+}
+
+func TestPrepareServiceSpec_LocalEnv(t *testing.T) {
+	// Not parallel because t.Setenv changes the environment of the whole process.
+	t.Setenv("UNCLOUD_TEST_LOCAL_ENV", "from-local")
+
+	opts := validRunOptions()
+	opts.env = []string{"UNCLOUD_TEST_LOCAL_ENV"}
+
+	spec, err := prepareServiceSpec(opts)
+	require.NoError(t, err)
+	assert.Equal(t, "from-local", spec.Container.Env["UNCLOUD_TEST_LOCAL_ENV"])
+}
+
+func TestPrepareServiceSpec_Invalid(t *testing.T) {
+	t.Parallel()
+
+	caddyfile := filepath.Join(t.TempDir(), "Caddyfile")
+	require.NoError(t, os.WriteFile(caddyfile, []byte("example.com {\n}"), 0o600))
+
+	tests := []struct {
+		name    string
+		modify  func(opts *runOptions)
+		wantErr string
+	}{
+		{
+			name:    "invalid image",
+			modify:  func(opts *runOptions) { opts.image = "INVALID IMAGE" },
+			wantErr: "invalid image",
+		},
+		{
+			name:    "invalid name",
+			modify:  func(opts *runOptions) { opts.name = "Not_Valid" },
+			wantErr: "invalid service name",
+		},
+		{
+			name:    "invalid mode",
+			modify:  func(opts *runOptions) { opts.mode = "unknown" },
+			wantErr: "invalid replication mode: 'unknown'",
+		},
+		{
+			name:    "invalid pull policy",
+			modify:  func(opts *runOptions) { opts.pull = "sometimes" },
+			wantErr: "invalid pull policy: 'sometimes'",
+		},
+		{
+			name:    "invalid env",
+			modify:  func(opts *runOptions) { opts.env = []string{"=value"} },
+			wantErr: "invalid environment variable: '=value'",
+		},
+		{
+			name:    "invalid port",
+			modify:  func(opts *runOptions) { opts.publish = []string{"not-a-port"} },
+			wantErr: "invalid service port 'not-a-port'",
+		},
+		{
+			name:    "invalid ulimit",
+			modify:  func(opts *runOptions) { opts.ulimits = []string{"nofile"} },
+			wantErr: "invalid ulimit 'nofile'",
+		},
+		{
+			name:    "volume without a container path",
+			modify:  func(opts *runOptions) { opts.volumes = []string{"data"} },
+			wantErr: "invalid volume mount 'data'",
+		},
+		{
+			name:    "volume with a relative container path",
+			modify:  func(opts *runOptions) { opts.volumes = []string{"data:relative"} },
+			wantErr: "must be absolute path",
+		},
+		{
+			name:    "volume with an unknown option",
+			modify:  func(opts *runOptions) { opts.volumes = []string{"data:/data:unknown"} },
+			wantErr: "invalid option: 'unknown'",
+		},
+		{
+			name:    "missing caddyfile",
+			modify:  func(opts *runOptions) { opts.caddyfile = filepath.Join(os.TempDir(), "uncloud-test-no-such-file") },
+			wantErr: "read Caddyfile",
+		},
+		{
+			name: "caddyfile with an ingress port",
+			modify: func(opts *runOptions) {
+				opts.caddyfile = caddyfile
+				opts.publish = []string{"app.example.com:8080/https"}
+			},
+			wantErr: "cannot be specified simultaneously",
+		},
+		{
+			name:    "service label without a key",
+			modify:  func(opts *runOptions) { opts.labels = []string{"=value"} },
+			wantErr: "key must not be empty",
+		},
+		{
+			name:    "container label without a key",
+			modify:  func(opts *runOptions) { opts.containerLabels = []string{"=value"} },
+			wantErr: "key must not be empty",
+		},
+		{
+			name:    "service label with whitespace",
+			modify:  func(opts *runOptions) { opts.labels = []string{"my label=value"} },
+			wantErr: "invalid service labels: label 'my label' must not contain whitespace",
+		},
+		{
+			name:    "container label with whitespace",
+			modify:  func(opts *runOptions) { opts.containerLabels = []string{"my label=value"} },
+			wantErr: "invalid container labels: label 'my label' must not contain whitespace",
+		},
+		{
+			name:    "reserved service label",
+			modify:  func(opts *runOptions) { opts.labels = []string{api.LabelManaged + "=true"} },
+			wantErr: "invalid service labels",
+		},
+		{
+			name:    "reserved container label",
+			modify:  func(opts *runOptions) { opts.containerLabels = []string{api.LabelManaged + "=true"} },
+			wantErr: "invalid container labels",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			opts := validRunOptions()
+			tt.modify(&opts)
+
+			_, err := prepareServiceSpec(opts)
+			require.ErrorContains(t, err, tt.wantErr)
+		})
+	}
+}

cmd/uc/service/update.go

@@ -0,0 +1,183 @@
+package service
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"maps"
+	"slices"
+
+	dockeropts "github.com/docker/cli/opts"
+	"github.com/docker/compose/v2/pkg/progress"
+	"github.com/docker/docker/pkg/stringid"
+	"github.com/psviderski/uncloud/internal/cli"
+	"github.com/psviderski/uncloud/internal/cli/completion"
+	"github.com/psviderski/uncloud/internal/cli/tui"
+	"github.com/psviderski/uncloud/pkg/api"
+	"github.com/psviderski/uncloud/pkg/client/deploy"
+	"github.com/spf13/cobra"
+)
+
+type updateOptions struct {
+	service string
+
+	cpu                dockeropts.NanoCPUs
+	cpuChanged         bool
+	memory             dockeropts.MemBytes
+	memoryChanged      bool
+	memoryReservation  dockeropts.MemBytes
+	reservationChanged bool
+	labelAdd           []string
+	labelRm            []string
+}
+
+func NewUpdateCommand() *cobra.Command {
+	opts := updateOptions{}
+	cmd := &cobra.Command{
+		Use:   "update SERVICE",
+		Short: "Update a service in place without recreating its containers.",
+		Long: `Update service configuration in place without recreating its containers.
+
+A CPU or memory limit can be changed but not removed. To remove a limit or change anything else,
+redeploy the service with 'uc deploy'`,
+		Example: `  # Change the CPU and memory limits.
+  uc service update web --cpu 0.5 --memory 512m
+
+  # Add or change a service label and remove another one.
+  uc service update web --label-add tier=frontend --label-rm legacy`,
+		Args: cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			uncli := cmd.Context().Value("cli").(*cli.CLI)
+
+			opts.service = args[0]
+			opts.cpuChanged = cmd.Flag("cpu").Changed
+			opts.memoryChanged = cmd.Flag("memory").Changed
+			opts.reservationChanged = cmd.Flag("memory-reservation").Changed
+
+			return update(cmd.Context(), uncli, opts)
+		},
+		ValidArgsFunction: func(
+			cmd *cobra.Command, args []string, toComplete string,
+		) ([]cobra.Completion, cobra.ShellCompDirective) {
+			if len(args) > 0 {
+				return nil, cobra.ShellCompDirectiveNoFileComp
+			}
+			uncli := cmd.Context().Value("cli").(*cli.CLI)
+			return completion.Services(cmd.Context(), uncli, args, toComplete)
+		},
+	}
+
+	cmd.Flags().Var(&opts.cpu, "cpu",
+		"Maximum number of CPU cores a service container can use.\n"+
+			"Fractional values are allowed: 0.5 for half a core or 2.25 for two and a quarter cores.")
+	cmd.Flags().Var(&opts.memory, "memory",
+		"Maximum amount of memory a service container can use. Value is a positive integer with\n"+
+			"optional unit suffix (b, k, m, g). Default unit is bytes if no suffix specified.\n"+
+			"Examples: 1073741824, 1024m, 1g (all equal 1 gibibyte)")
+	cmd.Flags().Var(&opts.memoryReservation, "memory-reservation",
+		"Minimum amount of memory reserved for a service container. Value is a positive integer with\n"+
+			"optional unit suffix (b, k, m, g). Default unit is bytes if no suffix specified.")
+	cmd.Flags().StringArrayVar(&opts.labelAdd, "label-add", nil,
+		"Add or change a service label. Can be specified multiple times.\n"+
+			"Format: key=value or just key for an empty value.")
+	cmd.Flags().StringArrayVar(&opts.labelRm, "label-rm", nil,
+		"Remove a service label by its key. Can be specified multiple times.")
+
+	return cmd
+}
+
+func update(ctx context.Context, uncli *cli.CLI, opts updateOptions) error {
+	if !opts.cpuChanged && !opts.memoryChanged && !opts.reservationChanged &&
+		len(opts.labelAdd) == 0 && len(opts.labelRm) == 0 {
+		return errors.New("no changes specified, set at least one of the flags: " +
+			"--cpu, --memory, --memory-reservation, --label-add, --label-rm")
+	}
+
+	labelAdd, err := parseLabels(opts.labelAdd)
+	if err != nil {
+		return err
+	}
+	if err = api.ValidateLabels(labelAdd); err != nil {
+		return fmt.Errorf("invalid service labels: %w", err)
+	}
+	for _, key := range opts.labelRm {
+		if _, ok := labelAdd[key]; ok {
+			return fmt.Errorf("label '%s' cannot be both added and removed", key)
+		}
+	}
+
+	clusterClient, err := uncli.ConnectCluster(ctx)
+	if err != nil {
+		return fmt.Errorf("connect to cluster: %w", err)
+	}
+	defer clusterClient.Close()
+
+	svc, err := clusterClient.InspectService(ctx, opts.service)
+	if err != nil {
+		return fmt.Errorf("inspect service '%s': %w", opts.service, err)
+	}
+
+	// Check all containers before changing any of them to avoid a partially updated service when a limit can't be
+	// changed in place. Containers may have different specs after a failed deployment so each one is updated from
+	// its own spec.
+	updates := make(map[string]api.UpdateContainerOptions, len(svc.Containers))
+	for _, mc := range svc.Containers {
+		spec := applyServiceUpdate(mc.Container.ServiceSpec, opts, labelAdd)
+
+		resources := mc.Container.AppliedResources()
+		if err = resources.ValidateUpdateInPlace(spec.Container.Resources); err != nil {
+			return fmt.Errorf("container '%s' on machine '%s' can't be updated without recreating it: %w",
+				stringid.TruncateID(mc.Container.ID), mc.MachineName, err)
+		}
+
+		containerOpts := deploy.ContainerUpdateOptions(mc.Container, spec)
+		if containerOpts != (api.UpdateContainerOptions{}) {
+			updates[mc.Container.ID] = containerOpts
+		}
+	}
+
+	if len(updates) == 0 {
+		fmt.Printf("Service %s is already up to date. No changes required.\n", tui.NameStyle.Render(svc.Name))
+		return nil
+	}
+
+	return progress.RunWithTitle(ctx, func(ctx context.Context) error {
+		// Keep updating the remaining containers if one fails, for example, because its machine is down.
+		// Running the command again only updates the containers that still differ.
+		var errs []error
+		for id, containerOpts := range updates {
+			if err := clusterClient.UpdateContainer(ctx, svc.ID, id, containerOpts); err != nil {
+				errs = append(errs, fmt.Errorf("update container '%s': %w", stringid.TruncateID(id), err))
+			}
+		}
+		return errors.Join(errs...)
+	}, uncli.ProgressOut(), "Updating service "+tui.NameStyle.Render(svc.Name))
+}
+
+// applyServiceUpdate returns a copy of the spec with the requested changes applied.
+func applyServiceUpdate(spec api.ServiceSpec, opts updateOptions, labelAdd map[string]string) api.ServiceSpec {
+	updated := spec.Clone()
+
+	if opts.cpuChanged {
+		updated.Container.Resources.CPU = opts.cpu.Value()
+	}
+	if opts.memoryChanged {
+		updated.Container.Resources.Memory = opts.memory.Value()
+	}
+	if opts.reservationChanged {
+		updated.Container.Resources.MemoryReservation = opts.memoryReservation.Value()
+	}
+
+	if len(labelAdd) > 0 && updated.Labels == nil {
+		updated.Labels = make(map[string]string, len(labelAdd))
+	}
+	maps.Copy(updated.Labels, labelAdd)
+
+	for key := range updated.Labels {
+		if slices.Contains(opts.labelRm, key) {
+			delete(updated.Labels, key)
+		}
+	}
+
+	return updated
+}

cmd/uc/service/update_test.go

@@ -0,0 +1,106 @@
+package service
+
+import (
+	"testing"
+
+	"github.com/psviderski/uncloud/pkg/api"
+	"github.com/psviderski/uncloud/pkg/client/deploy"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestApplyServiceUpdate(t *testing.T) {
+	t.Parallel()
+
+	newSpec := func() api.ServiceSpec {
+		return api.ServiceSpec{
+			Name: "web",
+			Container: api.ContainerSpec{
+				Image:  "nginx",
+				Labels: map[string]string{"container": "keep"},
+				Resources: api.ContainerResources{
+					CPU:               100 * api.MilliCore,
+					Memory:            1024,
+					MemoryReservation: 512,
+				},
+			},
+			Labels: map[string]string{"tier": "frontend", "legacy": "true"},
+		}
+	}
+
+	t.Run("adds, changes and removes labels", func(t *testing.T) {
+		t.Parallel()
+
+		spec := newSpec()
+		updated := applyServiceUpdate(spec, updateOptions{labelRm: []string{"legacy", "missing"}},
+			map[string]string{"tier": "backend", "team": "core"})
+
+		assert.Equal(t, map[string]string{"tier": "backend", "team": "core"}, updated.Labels)
+		assert.Equal(t, map[string]string{"container": "keep"}, updated.Container.Labels)
+		assert.Equal(t, spec.Container.Resources, updated.Container.Resources)
+		assert.Equal(t, map[string]string{"tier": "frontend", "legacy": "true"}, spec.Labels,
+			"Expected the original spec to stay unchanged")
+	})
+
+	t.Run("adds labels to a spec without labels", func(t *testing.T) {
+		t.Parallel()
+
+		spec := newSpec()
+		spec.Labels = nil
+		updated := applyServiceUpdate(spec, updateOptions{}, map[string]string{"tier": "backend"})
+
+		assert.Equal(t, map[string]string{"tier": "backend"}, updated.Labels)
+	})
+
+	t.Run("changes only requested limits", func(t *testing.T) {
+		t.Parallel()
+
+		opts := updateOptions{cpuChanged: true}
+		require.NoError(t, opts.cpu.Set("0.5"))
+
+		updated := applyServiceUpdate(newSpec(), opts, nil)
+
+		assert.EqualValues(t, 500*api.MilliCore, updated.Container.Resources.CPU)
+		assert.EqualValues(t, 1024, updated.Container.Resources.Memory)
+		assert.EqualValues(t, 512, updated.Container.Resources.MemoryReservation)
+	})
+
+	t.Run("sends only changed fields to the container", func(t *testing.T) {
+		t.Parallel()
+
+		opts := updateOptions{memoryChanged: true}
+		require.NoError(t, opts.memory.Set("2048"))
+
+		ctr := api.ServiceContainer{ServiceSpec: newSpec()}
+		containerOpts := deploy.ContainerUpdateOptions(ctr, applyServiceUpdate(ctr.ServiceSpec, opts, nil))
+
+		require.NotNil(t, containerOpts.Memory)
+		assert.EqualValues(t, 2048, *containerOpts.Memory)
+		assert.Nil(t, containerOpts.CPU)
+		assert.Nil(t, containerOpts.MemoryReservation)
+		assert.Nil(t, containerOpts.ServiceLabels)
+	})
+
+	t.Run("removing the last label clears service labels", func(t *testing.T) {
+		t.Parallel()
+
+		ctr := api.ServiceContainer{ServiceSpec: newSpec()}
+		containerOpts := deploy.ContainerUpdateOptions(ctr, applyServiceUpdate(
+			ctr.ServiceSpec, updateOptions{labelRm: []string{"tier", "legacy"}}, nil,
+		))
+
+		require.NotNil(t, containerOpts.ServiceLabels)
+		assert.Empty(t, *containerOpts.ServiceLabels)
+	})
+
+	t.Run("no changes produce empty container options", func(t *testing.T) {
+		t.Parallel()
+
+		ctr := api.ServiceContainer{ServiceSpec: newSpec()}
+		containerOpts := deploy.ContainerUpdateOptions(ctr, applyServiceUpdate(
+			ctr.ServiceSpec, updateOptions{}, map[string]string{"tier": "frontend"},
+		))
+
+		assert.Equal(t, api.UpdateContainerOptions{}, containerOpts)
+	})
+}

internal/machine/docker/controller.go

@@ -129,6 +129,11 @@ func (c *Controller) WatchAndSyncContainers(ctx context.Context) error {
 				"container_name", e.Actor.Attributes["name"],
 				"action", e.Action)
 
+			if err := c.syncContainersToStore(ctx); err != nil {
+				return fmt.Errorf("sync containers to cluster store: %w", err)
+			}
+		case <-c.service.ContainersChanged():
+			slog.Debug("Syncing containers to cluster store triggered by a container change in machine database.")
 			if err := c.syncContainersToStore(ctx); err != nil {
 				return fmt.Errorf("sync containers to cluster store: %w", err)
 			}

internal/machine/docker/server.go

@@ -594,21 +594,26 @@ func (s *Server) CreateServiceContainer(
 		}
 	}
 
+	// Apply user-defined labels first so that the system labels always take precedence.
+	labels := maps.Clone(spec.Container.Labels)
+	if labels == nil {
+		labels = make(map[string]string)
+	}
+	labels[api.LabelServiceID] = req.ServiceId
+	labels[api.LabelServiceName] = spec.Name
+	labels[api.LabelServiceMode] = spec.Mode
+	labels[api.LabelManaged] = ""
+
 	config := &container.Config{
 		Cmd:        spec.Container.Command,
 		Env:        envVars.ToSlice(),
 		Entrypoint: spec.Container.Entrypoint,
 		Hostname:   containerName,
 		Image:      spec.Container.Image,
-		Labels: map[string]string{
-			api.LabelServiceID:   req.ServiceId,
-			api.LabelServiceName: spec.Name,
-			api.LabelServiceMode: spec.Mode,
-			api.LabelManaged:     "",
-		},
-		User:      spec.Container.User,
-		Tty:       spec.Container.Tty,
-		OpenStdin: spec.Container.OpenStdin,
+		Labels:     labels,
+		User:       spec.Container.User,
+		Tty:        spec.Container.Tty,
+		OpenStdin:  spec.Container.OpenStdin,
 	}
 	if spec.Mode == "" {
 		config.Labels[api.LabelServiceMode] = api.ServiceModeReplicated
@@ -729,12 +734,10 @@ func (s *Server) CreateServiceContainer(
 
 	// Strip the container configuration that doesn't make sense for the pre-deploy hook and apply its overrides.
 	if spec.PreDeploy != nil && req.ContainerType == pb.CreateServiceContainerRequest_PRE_DEPLOY {
-		config.Labels = map[string]string{
-			api.LabelServiceID:   req.ServiceId,
-			api.LabelServiceName: spec.Name,
-			api.LabelHook:        api.LabelHookPreDeploy,
-			api.LabelManaged:     "",
-		}
+		// Keep the user-defined labels but replace the service mode and ports labels with the hook label.
+		delete(config.Labels, api.LabelServiceMode)
+		delete(config.Labels, api.LabelServicePorts)
+		config.Labels[api.LabelHook] = api.LabelHookPreDeploy
 		config.Healthcheck = &container.HealthConfig{
 			Test: []string{"NONE"},
 		}
@@ -1179,6 +1182,36 @@ func (s *Server) RemoveServiceContainer(ctx context.Context, req *pb.RemoveConta
 	return resp, nil
 }
 
+// UpdateServiceContainer updates the requested properties of a service container in place without recreating it.
+func (s *Server) UpdateServiceContainer(
+	ctx context.Context, req *pb.UpdateServiceContainerRequest,
+) (*emptypb.Empty, error) {
+	opts := api.UpdateContainerOptions{
+		CPU:               req.Cpu,
+		Memory:            req.Memory,
+		MemoryReservation: req.MemoryReservation,
+	}
+	if req.ServiceLabels != nil {
+		labels := req.ServiceLabels.Labels
+		opts.ServiceLabels = &labels
+	}
+
+	if err := s.service.UpdateServiceContainer(ctx, req.Id, opts); err != nil {
+		switch {
+		case errdefs.IsNotFound(err):
+			return nil, status.Error(codes.NotFound, err.Error())
+		case errdefs.IsInvalidArgument(err):
+			return nil, status.Error(codes.InvalidArgument, err.Error())
+		case errdefs.IsFailedPrecondition(err):
+			return nil, status.Error(codes.FailedPrecondition, err.Error())
+		default:
+			return nil, status.Error(codes.Internal, err.Error())
+		}
+	}
+
+	return &emptypb.Empty{}, nil
+}
+
 // logsHeartbeatInterval is the interval at which heartbeat entries are sent when there are no logs to stream.
 const logsHeartbeatInterval = 200 * time.Millisecond
 

internal/machine/docker/service.go

@@ -15,6 +15,7 @@ import (
 	"time"
 
 	"github.com/cenkalti/backoff/v4"
+	"github.com/containerd/errdefs"
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/events"
 	"github.com/docker/docker/api/types/filters"
@@ -34,6 +35,9 @@ type Service struct {
 	Client client.APIClient
 	// db is a connection to the machine database.
 	db *sqlx.DB
+	// containersChanged signals that service containers changed in the machine database without a corresponding
+	// Docker event, for example, when a container spec is updated in place.
+	containersChanged chan struct{}
 }
 
 // NewService creates a new Docker service instance.
@@ -41,9 +45,26 @@ func NewService(client client.APIClient, db *sqlx.DB) *Service {
 	return &Service{
 		Client: client,
 		db:     db,
+		// Buffering as a pending signal is enough for the consumer to pick up all changes made before it reacts.
+		containersChanged: make(chan struct{}, 1),
 	}
 }
 
+// NotifyContainersChanged signals that service containers changed in the machine database. It doesn't block
+// if a signal is already pending.
+func (s *Service) NotifyContainersChanged() {
+	select {
+	case s.containersChanged <- struct{}{}:
+	default:
+	}
+}
+
+// ContainersChanged returns a channel that receives a signal when service containers change in the machine database
+// without a corresponding Docker event.
+func (s *Service) ContainersChanged() <-chan struct{} {
+	return s.containersChanged
+}
+
 // WatchDaemonRestart watches the Docker engine and signals on the returned channel whenever the daemon
 // becomes reachable again after a disconnect, which typically indicates a restart.
 func (s *Service) WatchDaemonRestart(ctx context.Context) <-chan struct{} {
@@ -141,6 +162,90 @@ func (s *Service) InspectServiceContainer(ctx context.Context, nameOrID string)
 	return serviceCtr, nil
 }
 
+// UpdateServiceContainer updates the requested properties of a service container in place without recreating it.
+// It applies the CPU and memory limits to the container and updates the service spec stored for the container.
+func (s *Service) UpdateServiceContainer(ctx context.Context, id string, opts api.UpdateContainerOptions) error {
+	if opts.ServiceLabels != nil {
+		if err := api.ValidateLabels(*opts.ServiceLabels); err != nil {
+			return errdefs.ErrInvalidArgument.WithMessage(fmt.Sprintf("invalid service labels: %v", err))
+		}
+	}
+
+	ctr, err := s.InspectServiceContainer(ctx, id)
+	if err != nil {
+		return err
+	}
+	spec := ctr.ServiceSpec
+
+	resources := spec.Container.Resources
+	if opts.CPU != nil {
+		resources.CPU = *opts.CPU
+	}
+	if opts.Memory != nil {
+		resources.Memory = *opts.Memory
+	}
+	if opts.MemoryReservation != nil {
+		resources.MemoryReservation = *opts.MemoryReservation
+	}
+	if resources.CPU < 0 || resources.Memory < 0 || resources.MemoryReservation < 0 {
+		return errdefs.ErrInvalidArgument.WithMessage("CPU and memory limits must not be negative")
+	}
+	// Compare with the limits Docker applies to the container rather than the stored spec. They may differ if
+	// a previous update applied the limits but failed to store the spec, or the container was updated outside
+	// of Uncloud.
+	applied := ctr.AppliedResources()
+	if err = applied.ValidateUpdateInPlace(resources); err != nil {
+		return errdefs.ErrFailedPrecondition.WithMessage(
+			fmt.Sprintf("container '%s' can't be updated without recreating it: %v", ctr.ID, err))
+	}
+
+	// Only CPU and memory limits can differ after the in-place update check above.
+	if !applied.Equals(resources) {
+		updateResources := container.Resources{
+			NanoCPUs:          resources.CPU,
+			Memory:            resources.Memory,
+			MemoryReservation: resources.MemoryReservation,
+		}
+		// Docker defaults the swap limit to twice the memory limit when creating a container and rejects raising
+		// the memory limit above the current swap limit, so update both to keep the same semantics.
+		if resources.Memory > 0 {
+			updateResources.MemorySwap = 2 * resources.Memory
+		}
+		if _, err = s.Client.ContainerUpdate(ctx, ctr.ID, container.UpdateConfig{
+			Resources: updateResources,
+		}); err != nil {
+			return fmt.Errorf("update container resources: %w", err)
+		}
+	}
+	spec.Container.Resources = resources
+
+	if opts.ServiceLabels != nil {
+		spec.Labels = nil
+		if len(*opts.ServiceLabels) > 0 {
+			spec.Labels = *opts.ServiceLabels
+		}
+	}
+
+	specBytes, err := json.Marshal(spec)
+	if err != nil {
+		return fmt.Errorf("marshal service spec: %w", err)
+	}
+	res, err := s.db.ExecContext(ctx,
+		`UPDATE containers SET service_spec = $1, updated_at = datetime('subsecond') WHERE id = $2`,
+		string(specBytes), ctr.ID)
+	if err != nil {
+		return fmt.Errorf("update container in database: %w", err)
+	}
+	if n, err := res.RowsAffected(); err == nil && n == 0 {
+		return errdefs.ErrNotFound.WithMessage(fmt.Sprintf("container '%s' not found in machine database", ctr.ID))
+	}
+
+	// Propagate the updated spec to the cluster store without waiting for the next regular sync.
+	s.NotifyContainersChanged()
+
+	return nil
+}
+
 // ListServiceContainersResult holds the result of listing service containers, split into regular
 // service containers and one-off hook containers.
 type ListServiceContainersResult struct {

mise.toml

@@ -46,6 +46,25 @@ description = "Run the documentation website locally"
 dir = "website"
 run = "npm start --"
 
+[tasks.fmt]
+description = "Format Go code and imports"
+alias = "format"
+env.GOOS = "linux"
+run = "golangci-lint fmt"
+
+[tasks.lint]
+description = "Check Go code and formatting"
+# Explicitly set OS to Linux to not skip *_linux.go files when running on macOS.
+# Uncloud daemon won't likely support OS other than Linux anytime soon, so for now we can rely on that.
+env.GOOS = "linux"
+run = "golangci-lint run"
+
+[tasks."lint:fix"]
+description = "Format Go code and apply available lint fixes"
+alias = "lint-and-fix"
+env.GOOS = "linux"
+run = "golangci-lint run --fix"
+
 [tasks.mocks]
 description = "Regenerate Go test mocks"
 run = "mockery"

pkg/api/client.go

@@ -30,6 +30,7 @@ type ContainerClient interface {
 	StartContainer(ctx context.Context, serviceNameOrID, containerNameOrID string) error
 	StopContainer(ctx context.Context, serviceNameOrID, containerNameOrID string, opts container.StopOptions) error
 	RemoveContainer(ctx context.Context, serviceNameOrID, containerNameOrID string, opts container.RemoveOptions) error
+	UpdateContainer(ctx context.Context, serviceNameOrID, containerNameOrID string, opts UpdateContainerOptions) error
 	WaitContainerHealthy(
 		ctx context.Context, serviceNameOrID, containerNameOrID string, opts WaitContainerHealthyOptions,
 	) error

pkg/api/container.go

@@ -19,6 +19,11 @@ const (
 	// in internal/machine/docker/manager.go.
 	DockerNetworkName = "uncloud"
 
+	// LabelReservedPrefix is the prefix of labels reserved for Uncloud that users can't set on services and containers.
+	LabelReservedPrefix = "uncloud."
+	// LabelDaemonReservedPrefix is the prefix of labels reserved for the Uncloud daemon system containers.
+	LabelDaemonReservedPrefix = "uncloudd."
+
 	// LabelDaemonManaged marks system containers as managed by the Uncloud daemon.
 	LabelDaemonManaged = "uncloudd.managed"
 
@@ -175,6 +180,19 @@ type CreateContainerResponse struct {
 	Name string
 }
 
+// UpdateContainerOptions defines the properties of a service container to update in place without recreating it.
+// Nil fields are left unchanged.
+type UpdateContainerOptions struct {
+	// CPU is the new CPU limit in nanocores. The limit can be changed but not removed.
+	CPU *int64
+	// Memory is the new memory limit in bytes. The limit can be changed but not removed.
+	Memory *int64
+	// MemoryReservation is the new memory reservation in bytes. The reservation can be changed but not removed.
+	MemoryReservation *int64
+	// ServiceLabels replaces all service labels. A pointer to an empty map removes all service labels.
+	ServiceLabels *map[string]string
+}
+
 type ServiceContainer struct {
 	Container
 	ServiceSpec ServiceSpec
@@ -195,6 +213,21 @@ func (c *ServiceContainer) ServiceName() string {
 	return c.Config.Labels[LabelServiceName]
 }
 
+// AppliedResources returns the resources from the service spec with the CPU and memory limits that Docker currently
+// applies to the container. The applied limits may differ from the spec if an in-place update was interrupted or
+// the container was updated outside of Uncloud.
+func (c *ServiceContainer) AppliedResources() ContainerResources {
+	resources := c.ServiceSpec.Container.Resources
+	if c.ContainerJSONBase == nil || c.HostConfig == nil {
+		return resources
+	}
+
+	resources.CPU = c.HostConfig.NanoCPUs
+	resources.Memory = c.HostConfig.Memory
+	resources.MemoryReservation = c.HostConfig.MemoryReservation
+	return resources
+}
+
 // ServiceMode returns the replication mode of the service this container belongs to.
 func (c *ServiceContainer) ServiceMode() string {
 	return c.ServiceSpec.Mode

pkg/api/resources.go

@@ -1,7 +1,11 @@
 package api
 
 import (
+	"errors"
+
 	"github.com/docker/docker/api/types/container"
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
 )
 
 const (
@@ -27,6 +31,35 @@ type ContainerResources struct {
 	Ulimits map[string]Ulimit
 }
 
+// Equals returns true if the resources are equal, treating nil and empty slices and maps as equal.
+func (r ContainerResources) Equals(other ContainerResources) bool {
+	return cmp.Equal(r, other, cmpopts.EquateEmpty())
+}
+
+// ValidateUpdateInPlace returns an error explaining why a container created with these resources can't be updated
+// to the new resources without recreating it. It returns nil if the container can be updated in place.
+// Docker can only change the CPU and memory limits of an existing container and can't remove a limit once it's set.
+func (r ContainerResources) ValidateUpdateInPlace(new ContainerResources) error {
+	// Docker treats zero values as unchanged when updating a container.
+	if r.CPU != 0 && new.CPU == 0 {
+		return errors.New("CPU limit can't be removed")
+	}
+	if r.Memory != 0 && new.Memory == 0 {
+		return errors.New("memory limit can't be removed")
+	}
+	if r.MemoryReservation != 0 && new.MemoryReservation == 0 {
+		return errors.New("memory reservation can't be removed")
+	}
+
+	r.CPU = new.CPU
+	r.Memory = new.Memory
+	r.MemoryReservation = new.MemoryReservation
+	if !r.Equals(new) {
+		return errors.New("only CPU and memory limits can be changed")
+	}
+	return nil
+}
+
 // DeviceMapping represents a device mapping between host and container.
 type DeviceMapping struct {
 	// HostPath is the path to the device on the host.

pkg/api/resources_test.go

@@ -0,0 +1,72 @@
+package api
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestContainerResources_ValidateUpdateInPlace(t *testing.T) {
+	t.Parallel()
+
+	current := ContainerResources{
+		CPU:               Core,
+		Memory:            512 * 1024 * 1024,
+		MemoryReservation: 256 * 1024 * 1024,
+	}
+
+	tests := []struct {
+		name    string
+		new     func(r *ContainerResources)
+		wantErr string
+	}{
+		{
+			name: "same resources",
+			new:  func(*ContainerResources) {},
+		},
+		{
+			name: "change CPU and memory limits",
+			new: func(r *ContainerResources) {
+				r.CPU = 2 * Core
+				r.Memory = 1024 * 1024 * 1024
+				r.MemoryReservation = 128 * 1024 * 1024
+			},
+		},
+		{
+			name:    "remove CPU limit",
+			new:     func(r *ContainerResources) { r.CPU = 0 },
+			wantErr: "CPU limit can't be removed",
+		},
+		{
+			name:    "remove memory limit",
+			new:     func(r *ContainerResources) { r.Memory = 0 },
+			wantErr: "memory limit can't be removed",
+		},
+		{
+			name:    "remove memory reservation",
+			new:     func(r *ContainerResources) { r.MemoryReservation = 0 },
+			wantErr: "memory reservation can't be removed",
+		},
+		{
+			name:    "change shared memory",
+			new:     func(r *ContainerResources) { r.SharedMemory = 64 * 1024 * 1024 },
+			wantErr: "only CPU and memory limits can be changed",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			newResources := current
+			tt.new(&newResources)
+
+			err := current.ValidateUpdateInPlace(newResources)
+			if tt.wantErr == "" {
+				assert.NoError(t, err)
+			} else {
+				assert.EqualError(t, err, tt.wantErr)
+			}
+		})
+	}
+}

pkg/api/service.go

@@ -8,6 +8,7 @@ import (
 	"slices"
 	"strings"
 	"time"
+	"unicode"
 
 	mapset "github.com/deckarep/golang-set/v2"
 	"github.com/distribution/reference"
@@ -77,6 +78,9 @@ type ServiceSpec struct {
 	Configs []ConfigSpec
 	// Container defines the desired state of each container in the service.
 	Container ContainerSpec
+	// Labels are user-defined key-value metadata attached to the service. Unlike container labels, they're not
+	// applied to Docker containers. Keys must not use the reserved "uncloud." prefix.
+	Labels map[string]string
 	// Mode is the replication mode of the service. Default is ServiceModeReplicated if empty.
 	Mode string
 	Name string
@@ -157,6 +161,9 @@ func (s *ServiceSpec) Validate() error {
 	if err := s.Container.Validate(); err != nil {
 		return err
 	}
+	if err := ValidateLabels(s.Labels); err != nil {
+		return fmt.Errorf("invalid service labels: %w", err)
+	}
 
 	switch s.Mode {
 	case "", ServiceModeGlobal, ServiceModeReplicated:
@@ -243,6 +250,7 @@ func (s *ServiceSpec) Clone() ServiceSpec {
 		spec.Caddy = &caddyCopy
 	}
 	spec.Container = s.Container.Clone()
+	spec.Labels = maps.Clone(s.Labels)
 	spec.PreDeploy = s.PreDeploy.Clone()
 
 	if s.Ports != nil {
@@ -279,6 +287,10 @@ type ContainerSpec struct {
 	Image       string
 	// Run a custom init inside the container. If nil, use the daemon's configured settings.
 	Init *bool
+	// Labels are user-defined key-value metadata applied as Docker labels to each container in the service.
+	// Docker labels are immutable so changing them requires recreating the containers.
+	// Keys must not use the reserved "uncloud." prefix.
+	Labels map[string]string
 	// LogDriver overrides the default logging driver for the container. Each Docker daemon can have its own default.
 	LogDriver *LogDriver
 	// PidMode sets the PID namespace mode for the container. Currently only "" or "host" is supported.
@@ -333,6 +345,9 @@ func (s *ContainerSpec) Validate() error {
 	if _, err := reference.ParseDockerRef(s.Image); err != nil {
 		return fmt.Errorf("invalid image '%s': %w", s.Image, err)
 	}
+	if err := ValidateLabels(s.Labels); err != nil {
+		return fmt.Errorf("invalid container labels: %w", err)
+	}
 
 	for _, m := range s.VolumeMounts {
 		if err := m.Validate(); err != nil {
@@ -390,6 +405,7 @@ func (s *ContainerSpec) Clone() ContainerSpec {
 		hc.Test = slices.Clone(s.Healthcheck.Test)
 		spec.Healthcheck = &hc
 	}
+	spec.Labels = maps.Clone(s.Labels)
 	if s.LogDriver != nil {
 		logDriver := *s.LogDriver
 		if s.LogDriver.Options != nil {
@@ -428,6 +444,24 @@ func (s *ContainerSpec) Clone() ContainerSpec {
 	return spec
 }
 
+// ValidateLabels checks that label keys are non-empty, don't contain whitespace, and don't use the reserved Uncloud
+// prefixes.
+func ValidateLabels(labels map[string]string) error {
+	for k := range labels {
+		if strings.TrimSpace(k) == "" {
+			return fmt.Errorf("label key must not be empty")
+		}
+		if strings.ContainsFunc(k, unicode.IsSpace) {
+			return fmt.Errorf("label '%s' must not contain whitespace", k)
+		}
+		if strings.HasPrefix(k, LabelReservedPrefix) || strings.HasPrefix(k, LabelDaemonReservedPrefix) {
+			return fmt.Errorf("label '%s' cannot use the reserved prefix '%s' or '%s'",
+				k, LabelReservedPrefix, LabelDaemonReservedPrefix)
+		}
+	}
+	return nil
+}
+
 type EnvVars map[string]string
 
 // ToSlice converts the environment variables to a slice of strings in the format "key=value".
@@ -566,6 +600,36 @@ func (s *Service) FindContainer(nameOrID string) (MachineServiceContainer, error
 	return MachineServiceContainer{}, ErrNotFound
 }
 
+// Spec returns the service spec derived from its containers.
+// Containers may have different specs, for example, after a failed deployment. The result is the spec of the newest
+// running container, or the newest container if none are running. Replicas is set to the actual number of containers
+// for a replicated service.
+func (s *Service) Spec() ServiceSpec {
+	if len(s.Containers) == 0 {
+		return ServiceSpec{}
+	}
+
+	isRunning := func(c MachineServiceContainer) bool {
+		return c.Container.State.Running && !c.Container.State.Paused
+	}
+	selected := slices.MaxFunc(s.Containers, func(a, b MachineServiceContainer) int {
+		if aRunning, bRunning := isRunning(a), isRunning(b); aRunning != bRunning {
+			if aRunning {
+				return 1
+			}
+			return -1
+		}
+		return a.Container.CreatedTime().Compare(b.Container.CreatedTime())
+	})
+
+	spec := selected.Container.ServiceSpec.Clone()
+	// The replicas stored in a container spec go stale when the service is scaled without recreating the container.
+	if spec.Mode == ServiceModeReplicated {
+		spec.Replicas = uint(len(s.Containers))
+	}
+	return spec
+}
+
 // MachineIDs returns a list of unique machine IDs where the service containers are running.
 func (s *Service) MachineIDs() []string {
 	ids := mapset.NewSet[string]()

pkg/api/service_test.go

@@ -63,6 +63,54 @@ func TestServiceSpec_Validate_Name(t *testing.T) {
 	}
 }
 
+func TestServiceSpec_Validate_Labels(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name    string
+		labels  map[string]string
+		wantErr string
+	}{
+		{name: "nil labels"},
+		{name: "valid labels", labels: map[string]string{"com.example.team": "web", "tier": ""}},
+		{name: "prefix without dot", labels: map[string]string{"uncloudfoo": "bar"}},
+		{name: "whitespace in value", labels: map[string]string{"tier": "value with spaces"}},
+		{name: "empty key", labels: map[string]string{"": "bar"}, wantErr: "must not be empty"},
+		{name: "only whitespace in key", labels: map[string]string{" ": "bar"}, wantErr: "must not be empty"},
+		{name: "space in key", labels: map[string]string{"my label": "bar"}, wantErr: "must not contain whitespace"},
+		{name: "leading space in key", labels: map[string]string{" tier": "bar"}, wantErr: "must not contain whitespace"},
+		{name: "trailing space in key", labels: map[string]string{"tier ": "bar"}, wantErr: "must not contain whitespace"},
+		{name: "tab in key", labels: map[string]string{"my\tlabel": "bar"}, wantErr: "must not contain whitespace"},
+		{name: "newline in key", labels: map[string]string{"my\nlabel": "bar"}, wantErr: "must not contain whitespace"},
+		{name: "reserved prefix", labels: map[string]string{LabelManaged: ""}, wantErr: "reserved prefix"},
+		{name: "reserved daemon prefix", labels: map[string]string{"uncloudd.foo": "bar"}, wantErr: "reserved prefix"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name+"/service", func(t *testing.T) {
+			t.Parallel()
+			spec := ServiceSpec{Container: ContainerSpec{Image: "nginx:latest"}, Labels: tt.labels}
+			err := spec.Validate()
+			if tt.wantErr != "" {
+				require.ErrorContains(t, err, "invalid service labels")
+				require.ErrorContains(t, err, tt.wantErr)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+		t.Run(tt.name+"/container", func(t *testing.T) {
+			t.Parallel()
+			spec := ServiceSpec{Container: ContainerSpec{Image: "nginx:latest", Labels: tt.labels}}
+			err := spec.Validate()
+			if tt.wantErr != "" {
+				require.ErrorContains(t, err, "invalid container labels")
+				require.ErrorContains(t, err, tt.wantErr)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}
+
 func TestServiceSpec_Validate_CaddyAndPorts(t *testing.T) {
 	tests := []struct {
 		name    string
@@ -267,8 +315,9 @@ func TestContainerSpec_Clone(t *testing.T) {
 			"FOO": "bar",
 			"BAZ": "qux",
 		},
-		Image: "nginx:latest",
-		Init:  new(true),
+		Image:  "nginx:latest",
+		Init:   new(true),
+		Labels: map[string]string{"com.example.team": "web"},
 		LogDriver: &LogDriver{
 			Name: "json-file",
 			Options: map[string]string{
@@ -313,6 +362,7 @@ func TestContainerSpec_Clone(t *testing.T) {
 	original.Command[0] = stringModified
 	original.Entrypoint[0] = stringModified
 	original.Env["FOO"] = stringModified
+	original.Labels["com.example.team"] = stringModified
 	original.LogDriver.Options["max-size"] = stringModified
 	original.Volumes[0] = stringModified
 	original.VolumeMounts[0].ContainerPath = stringModified
@@ -328,6 +378,7 @@ func TestContainerSpec_Clone(t *testing.T) {
 	assert.Equal(t, "NET_ADMIN", cloned.CapAdd[0])
 	assert.Equal(t, "ALL", cloned.CapDrop[0])
 	assert.Equal(t, "sh", cloned.Command[0])
+	assert.Equal(t, "web", cloned.Labels["com.example.team"])
 	assert.Equal(t, "/bin/bash", cloned.Entrypoint[0])
 	assert.Equal(t, "bar", cloned.Env["FOO"])
 	assert.Equal(t, "qux", cloned.Env["BAZ"])
@@ -353,3 +404,110 @@ func TestContainerSpec_Clone(t *testing.T) {
 	assert.Equal(t, os.FileMode(0o644), *cloned.ConfigMounts[0].Mode, "Mode should be deep copied")
 	assert.Equal(t, "1", cloned.Sysctls["net.ipv4.ip_forward"])
 }
+
+func TestService_Spec(t *testing.T) {
+	t.Parallel()
+
+	newContainer := func(name, created string, running bool, mode string, replicas uint) MachineServiceContainer {
+		return MachineServiceContainer{Container: ServiceContainer{
+			Container: Container{InspectResponse: container.InspectResponse{
+				ContainerJSONBase: &container.ContainerJSONBase{
+					Created: created,
+					State:   &container.State{Running: running},
+				},
+			}},
+			ServiceSpec: ServiceSpec{
+				Labels:   map[string]string{"from": name},
+				Mode:     mode,
+				Replicas: replicas,
+			},
+		}}
+	}
+	const (
+		older = "2026-01-01T00:00:00Z"
+		newer = "2026-01-02T00:00:00Z"
+	)
+
+	t.Run("no containers", func(t *testing.T) {
+		t.Parallel()
+
+		svc := Service{HookContainers: []MachineServiceContainer{
+			newContainer("hook", newer, true, ServiceModeReplicated, 1),
+		}}
+
+		assert.Equal(t, ServiceSpec{}, svc.Spec())
+	})
+
+	t.Run("newest running container wins", func(t *testing.T) {
+		t.Parallel()
+
+		svc := Service{Containers: []MachineServiceContainer{
+			newContainer("old-running", older, true, ServiceModeReplicated, 1),
+			newContainer("new-running", newer, true, ServiceModeReplicated, 1),
+		}}
+
+		spec := svc.Spec()
+		assert.Equal(t, "new-running", spec.Labels["from"])
+	})
+
+	t.Run("running container wins over newer stopped one", func(t *testing.T) {
+		t.Parallel()
+
+		svc := Service{Containers: []MachineServiceContainer{
+			newContainer("new-stopped", newer, false, ServiceModeReplicated, 1),
+			newContainer("old-running", older, true, ServiceModeReplicated, 1),
+		}}
+
+		spec := svc.Spec()
+		assert.Equal(t, "old-running", spec.Labels["from"])
+	})
+
+	t.Run("newest container wins when none are running", func(t *testing.T) {
+		t.Parallel()
+
+		svc := Service{Containers: []MachineServiceContainer{
+			newContainer("old-stopped", older, false, ServiceModeReplicated, 1),
+			newContainer("new-stopped", newer, false, ServiceModeReplicated, 1),
+		}}
+
+		spec := svc.Spec()
+		assert.Equal(t, "new-stopped", spec.Labels["from"])
+	})
+
+	t.Run("replicas match the number of containers", func(t *testing.T) {
+		t.Parallel()
+
+		svc := Service{Containers: []MachineServiceContainer{
+			newContainer("a", older, true, ServiceModeReplicated, 5),
+			newContainer("b", newer, true, ServiceModeReplicated, 5),
+			newContainer("c", newer, false, ServiceModeReplicated, 5),
+		}}
+
+		spec := svc.Spec()
+		assert.EqualValues(t, 3, spec.Replicas)
+	})
+
+	t.Run("global service has no replicas", func(t *testing.T) {
+		t.Parallel()
+
+		svc := Service{Containers: []MachineServiceContainer{
+			newContainer("a", older, true, ServiceModeGlobal, 0),
+			newContainer("b", newer, true, ServiceModeGlobal, 0),
+		}}
+
+		spec := svc.Spec()
+		assert.Zero(t, spec.Replicas)
+	})
+
+	t.Run("result is independent of the container spec", func(t *testing.T) {
+		t.Parallel()
+
+		svc := Service{Containers: []MachineServiceContainer{
+			newContainer("a", older, true, ServiceModeReplicated, 1),
+		}}
+
+		spec := svc.Spec()
+		spec.Labels["from"] = "changed"
+		assert.Equal(t, "a", svc.Containers[0].Container.ServiceSpec.Labels["from"])
+	})
+}

pkg/client/compose/plan.go

@@ -55,7 +55,7 @@ func (p *Plan) Format() string {
 
 // formatSummary counts all operations across the plan and renders the summary footer.
 func (p *Plan) formatSummary() string {
-	var createCount, startFirstCount, stopFirstCount, removeCount int
+	var createCount, startFirstCount, stopFirstCount, updateCount, removeCount int
 	machines := make(map[string]struct{})
 
 	for _, op := range p.Volumes {
@@ -76,12 +76,15 @@ func (p *Plan) formatSummary() string {
 				} else {
 					startFirstCount++
 				}
+			case *operation.UpdateContainerOperation:
+				machines[o.MachineID] = struct{}{}
+				updateCount++
 			case *operation.RemoveContainerOperation:
 				machines[o.MachineID] = struct{}{}
 				removeCount++
 			case *operation.StopContainerOperation:
+				// Stop operations aren't counted because a later operation in the plan removes the stopped container.
 				machines[o.MachineID] = struct{}{}
-				removeCount++
 			}
 		}
 	}
@@ -99,6 +102,10 @@ func (p *Plan) formatSummary() string {
 		parts = append(parts,
 			tui.BoldYellow.Render(strconv.Itoa(stopFirstCount))+" "+tui.Yellow.Render("replace (stop-first)"))
 	}
+	if updateCount > 0 {
+		parts = append(parts,
+			tui.BoldYellow.Render(strconv.Itoa(updateCount))+" "+tui.Yellow.Render("update (in place)"))
+	}
 	if removeCount > 0 {
 		parts = append(parts,
 			tui.BoldRed.Render(strconv.Itoa(removeCount))+" "+tui.Red.Render("remove"))

pkg/client/compose/plan_test.go

@@ -0,0 +1,47 @@
+package compose
+
+import (
+	"testing"
+
+	"github.com/charmbracelet/x/ansi"
+	"github.com/psviderski/uncloud/pkg/api"
+	"github.com/psviderski/uncloud/pkg/client/deploy"
+	"github.com/psviderski/uncloud/pkg/client/operation"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPlan_FormatSummary(t *testing.T) {
+	t.Parallel()
+
+	web := &deploy.ServicePlan{}
+	web.Operations = []operation.Operation{
+		&operation.UpdateContainerOperation{MachineID: "m-1"},
+		&operation.RemoveContainerOperation{MachineID: "m-2"},
+	}
+	db := &deploy.ServicePlan{}
+	db.Operations = []operation.Operation{
+		&operation.UpdateContainerOperation{MachineID: "m-2"},
+	}
+	plan := &Plan{
+		Volumes:  []*operation.CreateVolumeOperation{{MachineID: "m-3"}},
+		Services: []*deploy.ServicePlan{web, db},
+	}
+
+	assert.Equal(t, "1 create · 2 update (in place) · 1 remove · across 3 machines", ansi.Strip(plan.formatSummary()))
+}
+
+func TestPlan_FormatSummary_StopOperationsNotCounted(t *testing.T) {
+	t.Parallel()
+
+	svc := &deploy.ServicePlan{}
+	svc.Operations = []operation.Operation{
+		&operation.StopContainerOperation{MachineID: "m-1"},
+		&operation.StopContainerOperation{MachineID: "m-1"},
+		&operation.ReplaceContainerOperation{MachineID: "m-1", Order: api.UpdateOrderStopFirst},
+		&operation.RemoveContainerOperation{MachineID: "m-1"},
+	}
+	plan := &Plan{Services: []*deploy.ServicePlan{svc}}
+
+	// Stop operations aren't counted because a later operation in the plan removes the stopped container.
+	assert.Equal(t, "1 replace (stop-first) · 1 remove · across 1 machine", ansi.Strip(plan.formatSummary()))
+}

pkg/client/compose/project_test.go

@@ -344,20 +344,6 @@ configs:
 			warnCount:    1,
 			warnContains: []string{"container_name"},
 		},
-		{
-			name: "deploy labels",
-			composeYAML: `services:
-  app:
-    image: myapp:latest
-    deploy:
-      mode: replicated
-      labels:
-        - foo
-      replicas: 2
-`,
-			warnCount:    1,
-			warnContains: []string{"deploy labels"},
-		},
 		{
 			name: "deploy restart_policy",
 			composeYAML: `services:

pkg/client/compose/service.go

@@ -66,6 +66,10 @@ func ServiceSpecFromCompose(project *types.Project, serviceName string) (api.Ser
 		Mode: api.ServiceModeReplicated,
 	}
 
+	if labels := mergeLabels(service.Labels, service.CustomLabels); len(labels) > 0 {
+		spec.Container.Labels = labels
+	}
+
 	// Map x-caddy extension to spec.Caddy if specified.
 	if caddy, ok := service.Extensions[CaddyExtensionKey].(Caddy); ok && caddy.Config != "" {
 		spec.Caddy = &api.CaddySpec{
@@ -124,6 +128,10 @@ func ServiceSpecFromCompose(project *types.Project, serviceName string) (api.Ser
 			d := time.Duration(cfg.Monitor)
 			spec.UpdateConfig.MonitorPeriod = &d
 		}
+
+		if len(service.Deploy.Labels) > 0 {
+			spec.Labels = maps.Clone(service.Deploy.Labels)
+		}
 	}
 
 	// TODO: can service.tmpfs be handled as tmpfs volume mounts as well?
@@ -480,9 +488,6 @@ func validateServicesFeatures(project *types.Project) []error {
 		if service.DNSSearch != nil {
 			errs = append(errs, err(service.Name, "dns_search"))
 		}
-		if service.Labels != nil {
-			errs = append(errs, err(service.Name, "labels"))
-		}
 		if service.Links != nil {
 			errs = append(errs, err(service.Name, "links"))
 		}
@@ -517,9 +522,6 @@ func validateServicesFeatures(project *types.Project) []error {
 			if service.Deploy.RollbackConfig != nil {
 				errs = append(errs, err(service.Name, "deploy rollback_config"))
 			}
-			if len(service.Deploy.Labels) != 0 {
-				errs = append(errs, err(service.Name, "deploy labels"))
-			}
 		}
 		// we only allow the 'default' network, nothing else.
 		if x := service.Networks; x != nil {

pkg/client/compose/service_test.go

@@ -875,6 +875,81 @@ services:
 	}
 }
 
+func TestServiceSpecFromCompose_Labels(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name                    string
+		composeYAML             string
+		expectedContainerLabels map[string]string
+		expectedServiceLabels   map[string]string
+	}{
+		{
+			name: "no labels",
+			composeYAML: `
+services:
+  web:
+    image: nginx
+`,
+		},
+		{
+			name: "container labels as list",
+			composeYAML: `
+services:
+  web:
+    image: nginx
+    labels:
+      - com.example.team=web
+      - com.example.empty
+`,
+			expectedContainerLabels: map[string]string{
+				"com.example.team":  "web",
+				"com.example.empty": "",
+			},
+		},
+		{
+			name: "container and service labels as maps",
+			composeYAML: `
+services:
+  web:
+    image: nginx
+    labels:
+      com.example.team: web
+    deploy:
+      labels:
+        tier: frontend
+`,
+			expectedContainerLabels: map[string]string{"com.example.team": "web"},
+			expectedServiceLabels:   map[string]string{"tier": "frontend"},
+		},
+		{
+			name: "service labels only",
+			composeYAML: `
+services:
+  web:
+    image: nginx
+    deploy:
+      labels:
+        - tier=frontend
+`,
+			expectedServiceLabels: map[string]string{"tier": "frontend"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			project, err := LoadProjectFromContent(context.Background(), tt.composeYAML)
+			require.NoError(t, err)
+
+			spec, err := ServiceSpecFromCompose(project, "web")
+			require.NoError(t, err)
+
+			assert.Equal(t, tt.expectedContainerLabels, spec.Container.Labels)
+			assert.Equal(t, tt.expectedServiceLabels, spec.Labels)
+		})
+	}
+}
+
 func TestServiceSpecFromCompose_UpdateConfig(t *testing.T) {
 	t.Parallel()
 

pkg/client/container.go

@@ -343,6 +343,39 @@ func (cli *Client) RemoveContainer(
 	return nil
 }
 
+// UpdateContainer updates the requested properties of the container within the service in place without recreating it.
+func (cli *Client) UpdateContainer(
+	ctx context.Context, serviceNameOrID, containerNameOrID string, opts api.UpdateContainerOptions,
+) error {
+	op, err := cli.resolveContainerOperation(ctx, serviceNameOrID, containerNameOrID)
+	if err != nil {
+		return err
+	}
+
+	req := &pb.UpdateServiceContainerRequest{
+		Id:                op.containerID,
+		Cpu:               opts.CPU,
+		Memory:            opts.Memory,
+		MemoryReservation: opts.MemoryReservation,
+	}
+	if opts.ServiceLabels != nil {
+		req.ServiceLabels = &pb.Labels{Labels: *opts.ServiceLabels}
+	}
+
+	pw := progress.ContextWriter(op.ctx)
+	pw.Event(progress.NewEvent(op.eventID, progress.Working, "Updating"))
+	if _, err = cli.Docker.GRPCClient.UpdateServiceContainer(op.ctx, req); err != nil {
+		pw.Event(progress.ErrorEvent(op.eventID))
+		if status.Code(err) == codes.NotFound {
+			return api.ErrNotFound
+		}
+		return err
+	}
+	pw.Event(progress.NewEvent(op.eventID, progress.Done, "Updated"))
+
+	return nil
+}
+
 // ExecContainer executes a command in a container within the service.
 // If containerNameOrID is empty, the first container in the service will be used.
 func (cli *Client) ExecContainer(

pkg/client/deploy/container.go

@@ -1,7 +1,7 @@
 package deploy
 
 import (
-	"reflect"
+	"maps"
 	"sort"
 
 	"github.com/google/go-cmp/cmp"
@@ -12,7 +12,8 @@ import (
 type ContainerSpecStatus string
 
 const (
-	ContainerUpToDate      ContainerSpecStatus = "up-to-date"
+	ContainerUpToDate ContainerSpecStatus = "up-to-date"
+	// ContainerNeedsUpdate means the container can be updated in place without recreating it.
 	ContainerNeedsUpdate   ContainerSpecStatus = "needs-update"
 	ContainerNeedsRecreate ContainerSpecStatus = "needs-recreate"
 )
@@ -83,15 +84,7 @@ func EvalContainerSpecChange(current api.ServiceSpec, new api.ServiceSpec) Conta
 		}
 	}
 
-	// Device reservations and mappings are immutable, so we'll need to recreate if any have changed
-	if !reflect.DeepEqual(current.Container.Resources.DeviceReservations, newResources.DeviceReservations) {
-		return ContainerNeedsRecreate
-	}
-	if !reflect.DeepEqual(current.Container.Resources.Devices, newResources.Devices) {
-		return ContainerNeedsRecreate
-	}
-	// Ulimits are immutable, so we'll need to recreate if any have changed.
-	if !reflect.DeepEqual(current.Container.Resources.Ulimits, newResources.Ulimits) {
+	if current.Container.Resources.ValidateUpdateInPlace(newResources) != nil {
 		return ContainerNeedsRecreate
 	}
 
@@ -100,8 +93,10 @@ func EvalContainerSpecChange(current api.ServiceSpec, new api.ServiceSpec) Conta
 		return ContainerNeedsRecreate
 	}
 
-	// Remaining resources are mutable.
-	if !reflect.DeepEqual(current.Container.Resources, newResources) {
+	// CPU and memory limits are updated on the running container. Service labels are only stored in the service spec
+	// and not applied to Docker containers.
+	if !current.Container.Resources.Equals(newResources) ||
+		!cmp.Equal(current.Labels, new.Labels, cmpopts.EquateEmpty()) {
 		return ContainerNeedsUpdate
 	}
 
@@ -119,3 +114,53 @@ func sortConfigs(configs []api.ConfigSpec) {
 		return configs[i].Name < configs[j].Name
 	})
 }
+
+// EvalContainerChange evaluates whether the running container matches the new spec, can be updated in place to
+// match it, or needs to be recreated. Unlike EvalContainerSpecChange, it also compares the new spec with the CPU and
+// memory limits that Docker applies to the container, so the container is updated when they drifted from its spec.
+func EvalContainerChange(current api.ServiceContainer, new api.ServiceSpec) ContainerSpecStatus {
+	status := EvalContainerSpecChange(current.ServiceSpec, new)
+	if status == ContainerNeedsRecreate {
+		return status
+	}
+
+	applied := current.AppliedResources()
+	newResources := new.Container.Resources
+	if applied.ValidateUpdateInPlace(newResources) != nil {
+		return ContainerNeedsRecreate
+	}
+	// Only CPU and memory limits can differ after the in-place update check above.
+	if !applied.Equals(newResources) {
+		return ContainerNeedsUpdate
+	}
+	return status
+}
+
+// ContainerUpdateOptions returns the container properties that can be updated in place and differ between the new
+// spec and either the container spec or the limits Docker applies to the container. It should only be used when
+// EvalContainerChange returns ContainerNeedsUpdate.
+func ContainerUpdateOptions(current api.ServiceContainer, new api.ServiceSpec) api.UpdateContainerOptions {
+	var opts api.UpdateContainerOptions
+
+	stored, applied := current.ServiceSpec.Container.Resources, current.AppliedResources()
+	res := new.Container.Resources
+	if res.CPU != stored.CPU || res.CPU != applied.CPU {
+		opts.CPU = &res.CPU
+	}
+	if res.Memory != stored.Memory || res.Memory != applied.Memory {
+		opts.Memory = &res.Memory
+	}
+	if res.MemoryReservation != stored.MemoryReservation || res.MemoryReservation != applied.MemoryReservation {
+		opts.MemoryReservation = &res.MemoryReservation
+	}
+
+	if !cmp.Equal(current.ServiceSpec.Labels, new.Labels, cmpopts.EquateEmpty()) {
+		labels := maps.Clone(new.Labels)
+		if labels == nil {
+			labels = map[string]string{}
+		}
+		opts.ServiceLabels = &labels
+	}
+
+	return opts
+}

pkg/client/deploy/container_test.go

@@ -86,6 +86,223 @@ func TestEvalContainerSpecChange_ContainerTty(t *testing.T) {
 	assert.Equal(t, ContainerNeedsRecreate, EvalContainerSpecChange(newSpec, currentSpec))
 }
 
+func TestEvalContainerSpecChange_ContainerLabels(t *testing.T) {
+	t.Parallel()
+
+	currentSpec := api.ServiceSpec{
+		Container: api.ContainerSpec{
+			Image: "nginx:latest",
+		},
+	}
+	newSpec := api.ServiceSpec{
+		Container: api.ContainerSpec{
+			Image:  "nginx:latest",
+			Labels: map[string]string{"com.example.team": "web"},
+		},
+	}
+	emptySpec := api.ServiceSpec{
+		Container: api.ContainerSpec{
+			Image:  "nginx:latest",
+			Labels: map[string]string{},
+		},
+	}
+
+	assert.Equal(t, ContainerNeedsRecreate, EvalContainerSpecChange(currentSpec, newSpec))
+	assert.Equal(t, ContainerNeedsRecreate, EvalContainerSpecChange(newSpec, currentSpec))
+	assert.Equal(t, ContainerUpToDate, EvalContainerSpecChange(newSpec, newSpec))
+	assert.Equal(t, ContainerUpToDate, EvalContainerSpecChange(currentSpec, emptySpec))
+}
+
+func TestEvalContainerSpecChange_ServiceLabels(t *testing.T) {
+	t.Parallel()
+
+	currentSpec := api.ServiceSpec{
+		Container: api.ContainerSpec{
+			Image: "nginx:latest",
+		},
+	}
+	newSpec := api.ServiceSpec{
+		Container: api.ContainerSpec{
+			Image: "nginx:latest",
+		},
+		Labels: map[string]string{"tier": "frontend"},
+	}
+	emptySpec := api.ServiceSpec{
+		Container: api.ContainerSpec{
+			Image: "nginx:latest",
+		},
+		Labels: map[string]string{},
+	}
+
+	assert.Equal(t, ContainerNeedsUpdate, EvalContainerSpecChange(currentSpec, newSpec))
+	assert.Equal(t, ContainerNeedsUpdate, EvalContainerSpecChange(newSpec, currentSpec))
+	assert.Equal(t, ContainerUpToDate, EvalContainerSpecChange(newSpec, newSpec))
+	assert.Equal(t, ContainerUpToDate, EvalContainerSpecChange(currentSpec, emptySpec))
+
+	// Changes that require recreating the container take precedence over the in-place update.
+	newSpecWithImage := newSpec.Clone()
+	newSpecWithImage.Container.Image = "nginx:alpine"
+	assert.Equal(t, ContainerNeedsRecreate, EvalContainerSpecChange(currentSpec, newSpecWithImage))
+}
+
+func TestEvalContainerChange(t *testing.T) {
+	t.Parallel()
+
+	spec := api.ServiceSpec{
+		Container: api.ContainerSpec{
+			Image:     "nginx:latest",
+			Resources: api.ContainerResources{CPU: api.Core, Memory: 256 * 1024 * 1024},
+		},
+	}
+	appliedSpec := container.Resources{NanoCPUs: api.Core, Memory: 256 * 1024 * 1024}
+
+	tests := []struct {
+		name       string
+		hostConfig *container.HostConfig
+		change     func(spec *api.ServiceSpec)
+		expected   ContainerSpecStatus
+	}{
+		{
+			name:       "applied limits match spec",
+			hostConfig: &container.HostConfig{Resources: appliedSpec},
+			change:     func(*api.ServiceSpec) {},
+			expected:   ContainerUpToDate,
+		},
+		{
+			name:     "unknown host config falls back to spec limits",
+			change:   func(*api.ServiceSpec) {},
+			expected: ContainerUpToDate,
+		},
+		{
+			name:       "applied memory limit drifted from spec",
+			hostConfig: &container.HostConfig{Resources: container.Resources{NanoCPUs: api.Core, Memory: 512 * 1024 * 1024}},
+			change:     func(*api.ServiceSpec) {},
+			expected:   ContainerNeedsUpdate,
+		},
+		{
+			name:       "applied limits already match new spec but stored spec doesn't",
+			hostConfig: &container.HostConfig{Resources: container.Resources{NanoCPUs: api.Core, Memory: 512 * 1024 * 1024}},
+			change:     func(spec *api.ServiceSpec) { spec.Container.Resources.Memory = 512 * 1024 * 1024 },
+			expected:   ContainerNeedsUpdate,
+		},
+		{
+			name: "applied limit not in spec can't be removed in place",
+			hostConfig: &container.HostConfig{Resources: container.Resources{
+				NanoCPUs: api.Core, Memory: 256 * 1024 * 1024, MemoryReservation: 128 * 1024 * 1024,
+			}},
+			change:   func(*api.ServiceSpec) {},
+			expected: ContainerNeedsRecreate,
+		},
+		{
+			name:       "spec change that requires recreating",
+			hostConfig: &container.HostConfig{Resources: appliedSpec},
+			change:     func(spec *api.ServiceSpec) { spec.Container.Image = "nginx:alpine" },
+			expected:   ContainerNeedsRecreate,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			newSpec := spec.Clone()
+			tt.change(&newSpec)
+			assert.Equal(t, tt.expected, EvalContainerChange(serviceContainer(spec, tt.hostConfig), newSpec))
+		})
+	}
+}
+
+func TestContainerUpdateOptions(t *testing.T) {
+	t.Parallel()
+
+	current := api.ServiceSpec{
+		Container: api.ContainerSpec{
+			Image:     "nginx:latest",
+			Resources: api.ContainerResources{CPU: api.Core, Memory: 256 * 1024 * 1024},
+		},
+		Labels: map[string]string{"tier": "frontend"},
+	}
+	applied := &container.HostConfig{Resources: container.Resources{NanoCPUs: api.Core, Memory: 256 * 1024 * 1024}}
+
+	tests := []struct {
+		name       string
+		hostConfig *container.HostConfig
+		change     func(spec *api.ServiceSpec)
+		expected   api.UpdateContainerOptions
+	}{
+		{
+			name:       "no changes",
+			hostConfig: applied,
+			change:     func(*api.ServiceSpec) {},
+		},
+		{
+			name:       "CPU only",
+			hostConfig: applied,
+			change:     func(spec *api.ServiceSpec) { spec.Container.Resources.CPU = 2 * api.Core },
+			expected:   api.UpdateContainerOptions{CPU: new(int64(2 * api.Core))},
+		},
+		{
+			name:       "memory and reservation",
+			hostConfig: applied,
+			change: func(spec *api.ServiceSpec) {
+				spec.Container.Resources.Memory = 512 * 1024 * 1024
+				spec.Container.Resources.MemoryReservation = 128 * 1024 * 1024
+			},
+			expected: api.UpdateContainerOptions{
+				Memory:            new(int64(512 * 1024 * 1024)),
+				MemoryReservation: new(int64(128 * 1024 * 1024)),
+			},
+		},
+		{
+			name: "applied memory limit drifted from spec",
+			hostConfig: &container.HostConfig{Resources: container.Resources{
+				NanoCPUs: api.Core, Memory: 512 * 1024 * 1024,
+			}},
+			change:   func(*api.ServiceSpec) {},
+			expected: api.UpdateContainerOptions{Memory: new(int64(256 * 1024 * 1024))},
+		},
+		{
+			name: "applied memory limit already matches new spec",
+			hostConfig: &container.HostConfig{Resources: container.Resources{
+				NanoCPUs: api.Core, Memory: 512 * 1024 * 1024,
+			}},
+			change:   func(spec *api.ServiceSpec) { spec.Container.Resources.Memory = 512 * 1024 * 1024 },
+			expected: api.UpdateContainerOptions{Memory: new(int64(512 * 1024 * 1024))},
+		},
+		{
+			name:       "change service labels",
+			hostConfig: applied,
+			change:     func(spec *api.ServiceSpec) { spec.Labels = map[string]string{"tier": "backend"} },
+			expected:   api.UpdateContainerOptions{ServiceLabels: &map[string]string{"tier": "backend"}},
+		},
+		{
+			name:       "remove all service labels",
+			hostConfig: applied,
+			change:     func(spec *api.ServiceSpec) { spec.Labels = nil },
+			expected:   api.UpdateContainerOptions{ServiceLabels: &map[string]string{}},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			newSpec := current.Clone()
+			tt.change(&newSpec)
+			assert.Equal(t, tt.expected, ContainerUpdateOptions(serviceContainer(current, tt.hostConfig), newSpec))
+		})
+	}
+}
+
+func serviceContainer(spec api.ServiceSpec, hostConfig *container.HostConfig) api.ServiceContainer {
+	return api.ServiceContainer{
+		Container: api.Container{InspectResponse: container.InspectResponse{
+			ContainerJSONBase: &container.ContainerJSONBase{HostConfig: hostConfig},
+		}},
+		ServiceSpec: spec,
+	}
+}
+
 func TestEvalContainerSpecChange_ContainerResources(t *testing.T) {
 	t.Parallel()
 
@@ -127,7 +344,7 @@ func TestEvalContainerSpecChange_ContainerResources(t *testing.T) {
 				CPU: 1000000000,
 			},
 			new:  api.ContainerResources{},
-			want: ContainerNeedsUpdate,
+			want: ContainerNeedsRecreate,
 		},
 
 		// Memory
@@ -189,19 +406,33 @@ func TestEvalContainerSpecChange_ContainerResources(t *testing.T) {
 			name:    "unset memory",
 			current: api.ContainerResources{Memory: 100 * 1024 * 1024, MemoryReservation: 50 * 1024 * 1024},
 			new:     api.ContainerResources{MemoryReservation: 50 * 1024 * 1024},
-			want:    ContainerNeedsUpdate,
+			want:    ContainerNeedsRecreate,
 		},
 		{
 			name:    "unset reservation",
 			current: api.ContainerResources{Memory: 100 * 1024 * 1024, MemoryReservation: 50 * 1024 * 1024},
 			new:     api.ContainerResources{Memory: 100 * 1024 * 1024},
-			want:    ContainerNeedsUpdate,
+			want:    ContainerNeedsRecreate,
 		},
 		{
 			name:    "unset memory and reservation",
 			current: api.ContainerResources{Memory: 100 * 1024 * 1024, MemoryReservation: 50 * 1024 * 1024},
 			new:     api.ContainerResources{},
-			want:    ContainerNeedsUpdate,
+			want:    ContainerNeedsRecreate,
+		},
+
+		// Shared memory
+		{
+			name:    "change shared memory",
+			current: api.ContainerResources{SharedMemory: 64 * 1024 * 1024},
+			new:     api.ContainerResources{SharedMemory: 128 * 1024 * 1024},
+			want:    ContainerNeedsRecreate,
+		},
+		{
+			name:    "change memory and shared memory",
+			current: api.ContainerResources{Memory: 100 * 1024 * 1024},
+			new:     api.ContainerResources{Memory: 200 * 1024 * 1024, SharedMemory: 64 * 1024 * 1024},
+			want:    ContainerNeedsRecreate,
 		},
 
 		// Memory and CPU

pkg/client/deploy/deploy.go

@@ -1,11 +1,15 @@
 package deploy
 
 import (
+	"cmp"
 	"context"
 	"errors"
 	"fmt"
+	"maps"
+	"slices"
 	"strconv"
 	"strings"
+	"unicode"
 
 	"charm.land/lipgloss/v2"
 	"charm.land/lipgloss/v2/table"
@@ -50,25 +54,31 @@ type ServicePlan struct {
 // Format renders the service plan as a styled block with a spec diff and nested container operations.
 func (sp *ServicePlan) Format() string {
 	// Determine service-level operation type and extract the old spec from container operations.
-	// Assume replace operations precede remove operations (rolling strategy) so the first replace operation
-	// (if exists) determines the old spec for the diff. Otherwise, fallback to the first remove operation.
+	// Containers may have different specs after a failed deployment. The first replaced container determines the old
+	// spec for the diff because a container updated in place already has the new image. Otherwise, fallback to the
+	// first updated container and then the first removed one.
 	var hasRun, hasRemove bool
-	var oldSpec *api.ServiceSpec
+	var replacedSpec, updatedSpec, removedSpec *api.ServiceSpec
 	for _, op := range sp.Operations {
 		switch o := op.(type) {
 		case *operation.RunContainerOperation:
 			hasRun = true
 		case *operation.ReplaceContainerOperation:
-			if oldSpec == nil {
-				oldSpec = &o.OldContainer.ServiceSpec
+			if replacedSpec == nil {
+				replacedSpec = &o.OldContainer.ServiceSpec
+			}
+		case *operation.UpdateContainerOperation:
+			if updatedSpec == nil {
+				updatedSpec = &o.Container.ServiceSpec
 			}
 		case *operation.RemoveContainerOperation:
 			hasRemove = true
-			if oldSpec == nil {
-				oldSpec = &o.Container.ServiceSpec
+			if removedSpec == nil {
+				removedSpec = &o.Container.ServiceSpec
 			}
 		}
 	}
+	oldSpec := cmp.Or(replacedSpec, updatedSpec, removedSpec)
 
 	// Service line modifier and verb.
 	var modifier, verb string
@@ -91,7 +101,7 @@ func (sp *ServicePlan) Format() string {
 	out.WriteString("\n")
 
 	// Build spec diff table: columns are [modifier, attribute, value or change].
-	// TODO: print diff for all changed attributes, not just image and replicas.
+	// TODO: print diff for all changed attributes, not just image, replicas, and labels.
 	//  Consider reusing the logic in EvalContainerSpecChange to return a structured diff.
 	specTable := table.New().
 		Border(lipgloss.Border{}).
@@ -141,17 +151,23 @@ func (sp *ServicePlan) Format() string {
 		}
 	}
 
-	// Stack "  │ " tree prefixes vertically, then join horizontally with the table.
-	tableStr := specTable.String()
-	treePrefix := tui.Faint.Render("  │ ")
-	treeColRows := make([]string, specTable.GetData().Rows())
-	for i := range treeColRows {
-		treeColRows[i] = treePrefix
-	}
-	treeCol := lipgloss.JoinVertical(lipgloss.Left, treeColRows...)
+	specDiff := specTable.String() + "\n"
 
-	out.WriteString(lipgloss.JoinHorizontal(lipgloss.Top, treeCol, tableStr))
-	out.WriteString("\n")
+	// Render labels as nested blocks outside the table to not widen its attribute column. An existing service without
+	// an old spec only has new containers added to up-to-date ones so its labels didn't change.
+	if sp.IsNewService || oldSpec != nil {
+		var oldLabels, oldContainerLabels map[string]string
+		if oldSpec != nil {
+			oldLabels, oldContainerLabels = oldSpec.Labels, oldSpec.Container.Labels
+		}
+		specDiff += formatLabelsDiff("labels:", oldLabels, sp.Spec.Labels, sp.IsNewService)
+		specDiff += formatLabelsDiff("container labels:", oldContainerLabels, sp.Spec.Container.Labels, sp.IsNewService)
+	}
+
+	treePrefix := tui.Faint.Render("  │ ")
+	for line := range strings.Lines(specDiff) {
+		out.WriteString(treePrefix + line)
+	}
 
 	// Blank separator line before container operations.
 	out.WriteString(tui.Faint.Render("  │"))
@@ -173,7 +189,7 @@ func (sp *ServicePlan) Format() string {
 
 // FormatSummary counts operations in the service plan and renders a styled summary line.
 func (sp *ServicePlan) FormatSummary() string {
-	var createCount, startFirstCount, stopFirstCount, removeCount int
+	var createCount, startFirstCount, stopFirstCount, updateCount, removeCount int
 	machines := make(map[string]struct{})
 
 	for _, op := range sp.Operations {
@@ -188,12 +204,15 @@ func (sp *ServicePlan) FormatSummary() string {
 			} else {
 				startFirstCount++
 			}
+		case *operation.UpdateContainerOperation:
+			machines[o.MachineID] = struct{}{}
+			updateCount++
 		case *operation.RemoveContainerOperation:
 			machines[o.MachineID] = struct{}{}
 			removeCount++
 		case *operation.StopContainerOperation:
+			// Stop operations aren't counted because a later operation in the plan removes the stopped container.
 			machines[o.MachineID] = struct{}{}
-			removeCount++
 		}
 	}
 
@@ -210,6 +229,10 @@ func (sp *ServicePlan) FormatSummary() string {
 		parts = append(parts,
 			tui.BoldYellow.Render(strconv.Itoa(stopFirstCount))+" "+tui.Yellow.Render("replace (stop-first)"))
 	}
+	if updateCount > 0 {
+		parts = append(parts,
+			tui.BoldYellow.Render(strconv.Itoa(updateCount))+" "+tui.Yellow.Render("update (in place)"))
+	}
 	if removeCount > 0 {
 		parts = append(parts,
 			tui.BoldRed.Render(strconv.Itoa(removeCount))+" "+tui.Red.Render("remove"))
@@ -265,6 +288,68 @@ func formatImageDiff(oldImage, newImage string) string {
 		tui.FormatImage(newImage, tui.Green)
 }
 
+// formatLabelsDiff renders a block with the attribute name followed by a nested line for each added, changed, or
+// removed label, sorted by key. It returns an empty string if the labels are the same.
+func formatLabelsDiff(attribute string, oldLabels, newLabels map[string]string, isNewService bool) string {
+	keys := slices.Concat(slices.Collect(maps.Keys(oldLabels)), slices.Collect(maps.Keys(newLabels)))
+	slices.Sort(keys)
+
+	var lines strings.Builder
+	for _, key := range slices.Compact(keys) {
+		oldValue, inOld := oldLabels[key]
+		newValue, inNew := newLabels[key]
+
+		var mod, diff string
+		switch {
+		case !inOld:
+			mod = tui.Green.Render("+")
+			// All attributes of a new service are new so only the green color marks them, without a modifier.
+			if isNewService {
+				mod = " "
+			}
+			diff = tui.Green.Render(key+tui.Faint.Render("=")) + tui.Green.Render(formatLabelValue(newValue))
+		case !inNew:
+			mod = tui.Red.Render("-")
+			diff = tui.Red.Render(key+tui.Faint.Render("=")) + tui.Red.Render(formatLabelValue(oldValue))
+		case oldValue != newValue:
+			mod = tui.Yellow.Render("~")
+			diff = key +
+				tui.Faint.Render("=") +
+				tui.Red.Render(formatLabelValue(oldValue)) + " " +
+				tui.Faint.Render("→") + " " +
+				tui.Green.Render(formatLabelValue(newValue))
+		default:
+			continue
+		}
+
+		lines.WriteString("    " + mod + " " + diff + "\n")
+	}
+	if lines.Len() == 0 {
+		return ""
+	}
+
+	blockMod := tui.Yellow.Render("~")
+	switch {
+	case isNewService:
+		blockMod = " "
+	case len(oldLabels) == 0:
+		blockMod = tui.Green.Render("+")
+	case len(newLabels) == 0:
+		blockMod = tui.Red.Render("-")
+	}
+
+	return blockMod + " " + tui.Faint.Render(attribute) + "\n" + lines.String()
+}
+
+// formatLabelValue returns the label value on a single line. It quotes and escapes empty values and values with
+// non-printable characters such as newlines so that they're visible in the diff. Other values are returned as is.
+func formatLabelValue(value string) string {
+	if value == "" || strings.ContainsFunc(value, func(r rune) bool { return !unicode.IsPrint(r) }) {
+		return strconv.Quote(value)
+	}
+	return value
+}
+
 // NewDeployment creates a new deployment for the given service specification.
 // If strategy is nil, a default RollingStrategy will be used.
 func NewDeployment(cli Client, spec api.ServiceSpec, strategy Strategy) *Deployment {

pkg/client/deploy/deploy_test.go

@@ -0,0 +1,285 @@
+package deploy
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/charmbracelet/x/ansi"
+	"github.com/docker/docker/api/types/container"
+	"github.com/psviderski/uncloud/pkg/api"
+	"github.com/psviderski/uncloud/pkg/client/operation"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestServicePlan_FormatSummary(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name     string
+		ops      []operation.Operation
+		expected string
+	}{
+		{
+			name: "in-place updates only",
+			ops: []operation.Operation{
+				&operation.UpdateContainerOperation{MachineID: "m-1"},
+				&operation.UpdateContainerOperation{MachineID: "m-2"},
+			},
+			expected: "2 update (in place) · across 2 machines",
+		},
+		{
+			name: "stop operations not counted as they are followed by remove",
+			ops: []operation.Operation{
+				&operation.StopContainerOperation{MachineID: "m-1"},
+				&operation.StopContainerOperation{MachineID: "m-1"},
+				&operation.ReplaceContainerOperation{MachineID: "m-1", Order: api.UpdateOrderStopFirst},
+				&operation.RemoveContainerOperation{MachineID: "m-1"},
+			},
+			expected: "1 replace (stop-first) · 1 remove · across 1 machine",
+		},
+		{
+			name: "all operation types",
+			ops: []operation.Operation{
+				&operation.RunContainerOperation{MachineID: "m-1"},
+				&operation.ReplaceContainerOperation{MachineID: "m-1", Order: api.UpdateOrderStartFirst},
+				&operation.ReplaceContainerOperation{MachineID: "m-2", Order: api.UpdateOrderStopFirst},
+				&operation.UpdateContainerOperation{MachineID: "m-2"},
+				&operation.RemoveContainerOperation{MachineID: "m-3"},
+			},
+			expected: "1 create · 1 replace (start-first) · 1 replace (stop-first) · 1 update (in place) · 1 remove · " +
+				"across 3 machines",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			plan := ServicePlan{}
+			plan.Operations = tt.ops
+			assert.Equal(t, tt.expected, ansi.Strip(plan.FormatSummary()))
+		})
+	}
+}
+
+func TestServicePlan_Format(t *testing.T) {
+	t.Parallel()
+
+	newContainer := func(spec api.ServiceSpec) api.ServiceContainer {
+		return api.ServiceContainer{
+			Container: api.Container{InspectResponse: container.InspectResponse{
+				ContainerJSONBase: &container.ContainerJSONBase{ID: "0f6df6593e1b0123456789abcdef"},
+			}},
+			ServiceSpec: spec,
+		}
+	}
+	spec := func(image string, labels, containerLabels map[string]string) api.ServiceSpec {
+		return api.ServiceSpec{
+			Name:      "web",
+			Mode:      api.ServiceModeReplicated,
+			Replicas:  1,
+			Labels:    labels,
+			Container: api.ContainerSpec{Image: image, Labels: containerLabels},
+		}
+	}
+
+	tests := []struct {
+		name         string
+		isNewService bool
+		spec         api.ServiceSpec
+		ops          func(spec api.ServiceSpec) []operation.Operation
+		expected     []string
+	}{
+		{
+			name: "service labels added, changed, and removed in place",
+			spec: spec("nginx:1.25", map[string]string{"env": "prod", "team": "platform", "same": "1"}, nil),
+			ops: func(api.ServiceSpec) []operation.Operation {
+				return []operation.Operation{&operation.UpdateContainerOperation{
+					MachineName: "machine-1",
+					Container: newContainer(spec(
+						"nginx:1.25", map[string]string{"old": "legacy", "team": "backend", "same": "1"}, nil,
+					)),
+				}}
+			},
+			expected: []string{
+				"~ update service web",
+				"  │   image: nginx:1.25",
+				"  │ ~ labels:",
+				"  │     + env=prod",
+				"  │     - old=legacy",
+				"  │     ~ team=backend → platform",
+				"  │",
+				"  ╰── ~   update container web/0f6df6593e1b on machine-1 (in place)",
+			},
+		},
+		{
+			name: "container labels changed with image on replace",
+			spec: spec("nginx:1.26", nil, map[string]string{"proxy": "on"}),
+			ops: func(new api.ServiceSpec) []operation.Operation {
+				return []operation.Operation{&operation.ReplaceContainerOperation{
+					Spec:         new,
+					MachineName:  "machine-1",
+					OldContainer: newContainer(spec("nginx:1.25", nil, map[string]string{"proxy": "off"})),
+				}}
+			},
+			expected: []string{
+				"~ update service web",
+				"  │ ~ image: nginx:1.25 → 1.26",
+				"  │ ~ container labels:",
+				"  │     ~ proxy=off → on",
+				"  │",
+				"  ╰── +/- replace container web/0f6df6593e1b on machine-1",
+			},
+		},
+		{
+			name: "no label blocks when labels are the same",
+			spec: spec("nginx:1.26", map[string]string{}, map[string]string{"proxy": "on"}),
+			ops: func(new api.ServiceSpec) []operation.Operation {
+				return []operation.Operation{&operation.ReplaceContainerOperation{
+					Spec:         new,
+					MachineName:  "machine-1",
+					OldContainer: newContainer(spec("nginx:1.25", nil, map[string]string{"proxy": "on"})),
+				}}
+			},
+			expected: []string{
+				"~ update service web",
+				"  │ ~ image: nginx:1.25 → 1.26",
+				"  │",
+				"  ╰── +/- replace container web/0f6df6593e1b on machine-1",
+			},
+		},
+		{
+			name: "replaced container determines old spec over updated one",
+			spec: spec("nginx:1.26", map[string]string{"team": "platform"}, nil),
+			ops: func(new api.ServiceSpec) []operation.Operation {
+				return []operation.Operation{
+					&operation.UpdateContainerOperation{
+						MachineName: "machine-1",
+						Container:   newContainer(spec("nginx:1.26", map[string]string{"team": "backend"}, nil)),
+					},
+					&operation.ReplaceContainerOperation{
+						Spec:         new,
+						MachineName:  "machine-2",
+						OldContainer: newContainer(spec("nginx:1.25", map[string]string{"team": "backend"}, nil)),
+					},
+				}
+			},
+			expected: []string{
+				"~ update service web",
+				"  │ ~ image: nginx:1.25 → 1.26",
+				"  │ ~ labels:",
+				"  │     ~ team=backend → platform",
+				"  │",
+				"  ├── ~   update container web/0f6df6593e1b on machine-1 (in place)",
+				"  ╰── +/- replace container web/0f6df6593e1b on machine-2",
+			},
+		},
+		{
+			name: "all labels removed",
+			spec: spec("nginx:1.25", map[string]string{}, nil),
+			ops: func(api.ServiceSpec) []operation.Operation {
+				return []operation.Operation{&operation.UpdateContainerOperation{
+					MachineName: "machine-1",
+					Container:   newContainer(spec("nginx:1.25", map[string]string{"a": "1", "b": "2"}, nil)),
+				}}
+			},
+			expected: []string{
+				"~ update service web",
+				"  │   image: nginx:1.25",
+				"  │ - labels:",
+				"  │     - a=1",
+				"  │     - b=2",
+				"  │",
+				"  ╰── ~   update container web/0f6df6593e1b on machine-1 (in place)",
+			},
+		},
+		{
+			name: "first labels added to existing service",
+			spec: spec("nginx:1.25", map[string]string{"a": "1"}, nil),
+			ops: func(api.ServiceSpec) []operation.Operation {
+				return []operation.Operation{&operation.UpdateContainerOperation{
+					MachineName: "machine-1",
+					Container:   newContainer(spec("nginx:1.25", nil, nil)),
+				}}
+			},
+			expected: []string{
+				"~ update service web",
+				"  │   image: nginx:1.25",
+				"  │ + labels:",
+				"  │     + a=1",
+				"  │",
+				"  ╰── ~   update container web/0f6df6593e1b on machine-1 (in place)",
+			},
+		},
+		{
+			name: "empty and non-printable label values are escaped on a single line",
+			spec: spec("nginx:1.25", map[string]string{
+				"added":    "1\n2",
+				"cleared":  "",
+				"json":     `{"a":1}`,
+				"multi":    "a\nb\nc",
+				"tab":      "a\tb",
+				"trailing": "hello\n",
+				"unicode":  "héllo wörld 🚀",
+			}, nil),
+			ops: func(api.ServiceSpec) []operation.Operation {
+				return []operation.Operation{&operation.UpdateContainerOperation{
+					MachineName: "machine-1",
+					Container: newContainer(spec("nginx:1.25", map[string]string{
+						"cleared":  "x",
+						"multi":    "a\nb",
+						"trailing": "hello",
+					}, nil)),
+				}}
+			},
+			expected: []string{
+				"~ update service web",
+				"  │   image: nginx:1.25",
+				"  │ ~ labels:",
+				`  │     + added="1\n2"`,
+				`  │     ~ cleared=x → ""`,
+				`  │     + json={"a":1}`,
+				`  │     ~ multi="a\nb" → "a\nb\nc"`,
+				`  │     + tab="a\tb"`,
+				`  │     ~ trailing=hello → "hello\n"`,
+				"  │     + unicode=héllo wörld 🚀",
+				"  │",
+				"  ╰── ~   update container web/0f6df6593e1b on machine-1 (in place)",
+			},
+		},
+		{
+			name:         "new service with labels",
+			isNewService: true,
+			spec:         spec("nginx:1.25", map[string]string{"team": "platform"}, map[string]string{"proxy": "on"}),
+			ops: func(new api.ServiceSpec) []operation.Operation {
+				return []operation.Operation{&operation.RunContainerOperation{Spec: new, MachineName: "machine-1"}}
+			},
+			expected: []string{
+				"+ create service web",
+				"  │   image: nginx:1.25",
+				"  │   labels:",
+				"  │       team=platform",
+				"  │   container labels:",
+				"  │       proxy=on",
+				"  │",
+				"  ╰── +   run container web on machine-1",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			plan := ServicePlan{ServiceName: "web", IsNewService: tt.isNewService, Spec: tt.spec}
+			plan.Operations = tt.ops(tt.spec)
+
+			// The table pads cells to the column width so ignore trailing whitespace.
+			var lines []string
+			for line := range strings.Lines(ansi.Strip(plan.Format())) {
+				lines = append(lines, strings.TrimRight(line, " \n"))
+			}
+			assert.Equal(t, tt.expected, lines)
+		})
+	}
+}

pkg/client/deploy/strategy.go

@@ -92,7 +92,7 @@ func (s *RollingStrategy) planReplicated(svc *api.Service, spec api.ServiceSpec)
 
 	// Organise existing containers by machine.
 	containersOnMachine := make(map[string][]api.ServiceContainer)
-	upToDateContainersOnMachine := make(map[string]int)
+	reusableContainersOnMachine := make(map[string]int)
 	containerSpecStatuses := make(map[string]ContainerSpecStatus)
 	if svc != nil {
 		for _, c := range svc.Containers {
@@ -105,40 +105,50 @@ func (s *RollingStrategy) planReplicated(svc *api.Service, spec api.ServiceSpec)
 			if s.ForceRecreate {
 				status = ContainerNeedsRecreate
 			} else {
-				status = EvalContainerSpecChange(c.Container.ServiceSpec, spec)
+				status = EvalContainerChange(c.Container, spec)
 			}
 			containerSpecStatuses[c.Container.ID] = status
 
-			if status == ContainerUpToDate {
-				upToDateContainersOnMachine[c.MachineID] += 1
+			if status != ContainerNeedsRecreate {
+				reusableContainersOnMachine[c.MachineID] += 1
 			}
 		}
 
-		// Sort containers such that running containers with the desired spec are first.
+		// Sort containers such that running containers with the desired spec or that can be updated in place to
+		// the desired spec are first.
+		// TODO: consider ranking up-to-date containers above ones that need an in-place update (here, when sorting
+		//  machines, and in reconcileGlobalContainer) to avoid updating a container while removing an up-to-date one.
+		isReusable := func(c api.MachineServiceContainer) bool {
+			// Not running containers have no status.
+			status, ok := containerSpecStatuses[c.Container.ID]
+			return ok && status != ContainerNeedsRecreate
+		}
 		slices.SortFunc(svc.Containers, func(c1, c2 api.MachineServiceContainer) int {
-			if status, ok := containerSpecStatuses[c1.Container.ID]; ok && status == ContainerUpToDate {
+			r1, r2 := isReusable(c1), isReusable(c2)
+			switch {
+			case r1 == r2:
+				return 0
+			case r1:
 				return -1
-			}
-			if status, ok := containerSpecStatuses[c2.Container.ID]; ok && status == ContainerUpToDate {
+			default:
 				return 1
 			}
-			return 0
 		})
 
 		for _, c := range svc.Containers {
 			containersOnMachine[c.MachineID] = append(containersOnMachine[c.MachineID], c.Container)
 		}
 
-		// Sort machines such that machines with the most up-to-date containers are first, followed by machines with
-		// existing containers, and finally machines without containers.
+		// Sort machines such that machines with the most containers that are up to date or can be updated in place
+		// are first, followed by machines with existing containers, and finally machines without containers.
 		slices.SortFunc(matchedMachines, func(m1, m2 *pb.MachineInfo) int {
-			if upToDateContainersOnMachine[m1.Id] > 0 && upToDateContainersOnMachine[m2.Id] > 0 {
-				return upToDateContainersOnMachine[m2.Id] - upToDateContainersOnMachine[m1.Id]
+			if reusableContainersOnMachine[m1.Id] > 0 && reusableContainersOnMachine[m2.Id] > 0 {
+				return reusableContainersOnMachine[m2.Id] - reusableContainersOnMachine[m1.Id]
 			}
-			if upToDateContainersOnMachine[m1.Id] > 0 {
+			if reusableContainersOnMachine[m1.Id] > 0 {
 				return -1
 			}
-			if upToDateContainersOnMachine[m2.Id] > 0 {
+			if reusableContainersOnMachine[m2.Id] > 0 {
 				return 1
 			}
 			return len(containersOnMachine[m2.Id]) - len(containersOnMachine[m1.Id])
@@ -170,7 +180,16 @@ func (s *RollingStrategy) planReplicated(svc *api.Service, spec api.ServiceSpec)
 			if status == ContainerUpToDate {
 				continue
 			}
-			// TODO: handle ContainerNeedsUpdate when update of mutable fields on a container is supported.
+			if status == ContainerNeedsUpdate {
+				plan.Operations = append(plan.Operations, &operation.UpdateContainerOperation{
+					ServiceID:   plan.ServiceID,
+					MachineID:   m.Id,
+					MachineName: m.Name,
+					Container:   ctr,
+					Options:     ContainerUpdateOptions(ctr, spec),
+				})
+				continue
+			}
 		}
 
 		// Replace the old container with a new one.
@@ -301,7 +320,7 @@ func reconcileGlobalContainer(
 	}
 
 	// Check if there is a container with the same spec already running. If so, remove the rest.
-	upToDate := false
+	reused := false
 	for i, c := range containers {
 		if !c.Container.State.Running || c.Container.State.Paused {
 			// Skip containers that are not running.
@@ -312,12 +331,21 @@ func reconcileGlobalContainer(
 		if forceRecreate {
 			status = ContainerNeedsRecreate
 		} else {
-			status = EvalContainerSpecChange(c.Container.ServiceSpec, spec)
+			status = EvalContainerChange(c.Container, spec)
 		}
 
-		if status == ContainerUpToDate {
-			// The container is already running with the same spec.
-			upToDate = true
+		if status != ContainerNeedsRecreate {
+			// The container is already running with the desired spec or can be updated in place to it.
+			reused = true
+			if status == ContainerNeedsUpdate {
+				ops = append(ops, &operation.UpdateContainerOperation{
+					ServiceID:   serviceID,
+					MachineID:   machine.Id,
+					MachineName: machine.Name,
+					Container:   c.Container,
+					Options:     ContainerUpdateOptions(c.Container, spec),
+				})
+			}
 			for j, old := range containers {
 				if i == j {
 					continue
@@ -331,10 +359,8 @@ func reconcileGlobalContainer(
 			}
 			break
 		}
-		// TODO: handle ContainerNeedsUpdate when update of mutable fields on a container is supported.
-		//  Make sure to update preDeployOperation accordingly.
 	}
-	if upToDate {
+	if reused {
 		return ops, nil
 	}
 
@@ -360,6 +386,7 @@ func reconcileGlobalContainer(
 			if err != nil || len(conflictingPorts) > 0 {
 				ops = append(ops, &operation.StopContainerOperation{
 					ServiceID:       serviceID,
+					ServiceName:     c.Container.ServiceSpec.Name,
 					ContainerID:     c.Container.ID,
 					MachineID:       machine.Id,
 					MachineName:     machine.Name,

pkg/client/deploy/strategy_test.go

@@ -1,6 +1,8 @@
 package deploy
 
 import (
+	"slices"
+	"strings"
 	"testing"
 
 	"github.com/docker/docker/api/types/container"
@@ -11,6 +13,7 @@ import (
 	"github.com/psviderski/uncloud/pkg/client/deploy/scheduler"
 	"github.com/psviderski/uncloud/pkg/client/operation"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestDetermineUpdateOrder(t *testing.T) {
@@ -360,6 +363,7 @@ func TestReconcileGlobalContainer(t *testing.T) {
 			expectedOps: []operation.Operation{
 				&operation.StopContainerOperation{
 					ServiceID:   "service-1",
+					ServiceName: container2WithPort9090.ServiceSpec.Name,
 					ContainerID: "container-2",
 					MachineID:   "machine-1",
 					MachineName: "machine-1",
@@ -424,6 +428,121 @@ func TestReconcileGlobalContainer(t *testing.T) {
 	}
 }
 
+func TestRollingStrategy_Plan_UpdateInPlace(t *testing.T) {
+	t.Parallel()
+
+	state := &scheduler.ClusterState{
+		Machines: []*scheduler.Machine{
+			{Info: &pb.MachineInfo{Id: "m-1", Name: "machine-1"}},
+			{Info: &pb.MachineInfo{Id: "m-2", Name: "machine-2"}},
+		},
+	}
+	newContainer := func(id string, spec api.ServiceSpec) api.ServiceContainer {
+		ctr := newServiceContainer(id, container.State{Running: true, Status: "running"})
+		ctr.ServiceSpec = spec
+		return ctr
+	}
+
+	tests := []struct {
+		name   string
+		change func(spec *api.ServiceSpec)
+		// options are the expected in-place update options. Nil means the containers must be recreated.
+		options *api.UpdateContainerOptions
+	}{
+		{
+			name:    "service labels",
+			change:  func(spec *api.ServiceSpec) { spec.Labels = map[string]string{"tier": "backend"} },
+			options: &api.UpdateContainerOptions{ServiceLabels: &map[string]string{"tier": "backend"}},
+		},
+		{
+			name: "CPU and memory limits",
+			change: func(spec *api.ServiceSpec) {
+				spec.Container.Resources.CPU = 2 * api.Core
+				spec.Container.Resources.Memory = 512 * 1024 * 1024
+			},
+			options: &api.UpdateContainerOptions{
+				CPU:    new(int64(2 * api.Core)),
+				Memory: new(int64(512 * 1024 * 1024)),
+			},
+		},
+		{
+			name:   "remove memory limit",
+			change: func(spec *api.ServiceSpec) { spec.Container.Resources.Memory = 0 },
+		},
+	}
+
+	for _, tt := range tests {
+		for _, mode := range []string{api.ServiceModeReplicated, api.ServiceModeGlobal} {
+			t.Run(tt.name+"/"+mode, func(t *testing.T) {
+				currentSpec := api.ServiceSpec{
+					Name: "app",
+					Mode: mode,
+					Container: api.ContainerSpec{
+						Image: "nginx:latest",
+						Resources: api.ContainerResources{
+							CPU:    api.Core,
+							Memory: 256 * 1024 * 1024,
+						},
+					},
+					Labels:    map[string]string{"tier": "frontend"},
+					PreDeploy: &api.PreDeployHook{Command: []string{"db", "migrate"}},
+				}
+				if mode == api.ServiceModeReplicated {
+					currentSpec.Replicas = 2
+				}
+				newSpec := currentSpec.Clone()
+				tt.change(&newSpec)
+
+				ctr1 := newContainer("container-1", currentSpec)
+				ctr2 := newContainer("container-2", currentSpec)
+				svc := &api.Service{
+					ID:   "svc-1",
+					Name: "app",
+					Mode: mode,
+					Containers: []api.MachineServiceContainer{
+						{MachineID: "m-1", MachineName: "machine-1", Container: ctr1},
+						{MachineID: "m-2", MachineName: "machine-2", Container: ctr2},
+					},
+				}
+
+				plan, err := (&RollingStrategy{}).Plan(state, svc, newSpec)
+				require.NoError(t, err)
+
+				if tt.options == nil {
+					require.NotEmpty(t, plan.Operations)
+					for _, op := range plan.Operations {
+						_, isUpdate := op.(*operation.UpdateContainerOperation)
+						assert.False(t, isUpdate, "Expected containers to be recreated, got %s", op)
+					}
+					return
+				}
+				// The replicated strategy shuffles machines so sort the operations to compare them deterministically.
+				ops := slices.Clone(plan.Operations)
+				slices.SortFunc(ops, func(a, b operation.Operation) int {
+					return strings.Compare(a.String(), b.String())
+				})
+				// The containers are updated in place and the pre-deploy hook is not run.
+				assertOperationsEqual(t, []operation.Operation{
+					&operation.UpdateContainerOperation{
+						ServiceID:   "svc-1",
+						MachineID:   "m-1",
+						MachineName: "machine-1",
+						Container:   ctr1,
+						Options:     *tt.options,
+					},
+					&operation.UpdateContainerOperation{
+						ServiceID:   "svc-1",
+						MachineID:   "m-2",
+						MachineName: "machine-2",
+						Container:   ctr2,
+						Options:     *tt.options,
+					},
+				}, ops)
+			})
+		}
+	}
+}
+
 func TestPreDeployOperations(t *testing.T) {
 	hook := &api.PreDeployHook{
 		Command: []string{"db", "migrate"},
@@ -502,6 +621,20 @@ func TestPreDeployOperations(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "plan has only UpdateContainerOperation",
+			plan: ServicePlan{
+				ServiceID:   "svc-1",
+				ServiceName: "app",
+				Spec:        api.ServiceSpec{PreDeploy: hook},
+				SequenceOperation: operation.SequenceOperation{
+					Operations: []operation.Operation{
+						&operation.UpdateContainerOperation{MachineID: "m-1", MachineName: "machine-1"},
+					},
+				},
+			},
+			expected: nil,
+		},
 		{
 			name: "plan has only RemoveContainerOperation",
 			plan: ServicePlan{
@@ -614,7 +747,8 @@ func TestPreDeployOperations(t *testing.T) {
 			},
 			svc: &api.Service{
 				HookContainers: []api.MachineServiceContainer{
-					{MachineID: "m-1", Container: newServiceContainer("stopped-hook", container.State{Status: "exited"})},
+					{MachineID: "m-1", Container: newServiceContainer("stopped-hook",
+						container.State{Status: "exited"})},
 					{MachineID: "m-1", Container: runningHook1},
 					{MachineID: "m-3", Container: runningHook2},
 				},
@@ -660,6 +794,7 @@ func newServiceContainer(id string, state container.State) api.ServiceContainer
 				ID:    id,
 				State: &state,
 			},
+			Config: &container.Config{},
 		},
 	}}
 }

pkg/client/operation/container.go

@@ -82,7 +82,9 @@ func (o *RunContainerOperation) String() string {
 
 // StopContainerOperation stops a container on a specific machine.
 type StopContainerOperation struct {
-	ServiceID   string
+	ServiceID string
+	// ServiceName is used for formatting the operation as part of the deployment plan.
+	ServiceName string
 	ContainerID string
 	MachineID   string
 	// MachineName is used for formatting the operation as part of the deployment plan.
@@ -98,8 +100,7 @@ func (o *StopContainerOperation) Execute(ctx context.Context, cli Client) error
 }
 
 func (o *StopContainerOperation) Format() string {
-	// TODO: pass service name to format the display name consistently with other operations.
-	displayName := stringid.TruncateID(o.ContainerID)
+	displayName := o.ServiceName + tui.Faint.Render("/") + stringid.TruncateID(o.ContainerID)
 
 	return tui.BoldRed.Render("-") + "   " +
 		tui.Faint.Render("stop container") + " " +
@@ -285,6 +286,39 @@ func (o *ReplaceContainerOperation) String() string {
 		o.MachineID, o.ServiceID, o.OldContainer.ID, o.Order)
 }
 
+// UpdateContainerOperation updates the requested properties of a running container in place without recreating it.
+type UpdateContainerOperation struct {
+	ServiceID string
+	MachineID string
+	// MachineName is used for formatting the operation as part of the deployment plan.
+	MachineName string
+	Container   api.ServiceContainer
+	Options     api.UpdateContainerOptions
+}
+
+func (o *UpdateContainerOperation) Execute(ctx context.Context, cli Client) error {
+	if err := cli.UpdateContainer(ctx, o.ServiceID, o.Container.ID, o.Options); err != nil {
+		return fmt.Errorf("update container: %w", err)
+	}
+	return nil
+}
+
+func (o *UpdateContainerOperation) Format() string {
+	displayName := o.Container.ServiceSpec.Name + tui.Faint.Render("/") + o.Container.ShortID()
+
+	return tui.BoldYellow.Render("~") + "   " +
+		tui.Faint.Render("update container") + " " +
+		displayName + " " +
+		tui.Faint.Render("on") + " " +
+		o.MachineName + " " +
+		tui.Faint.Render("(in place)")
+}
+
+func (o *UpdateContainerOperation) String() string {
+	return fmt.Sprintf("UpdateContainerOperation[machine_id=%s service_id=%s container_id=%s]",
+		o.MachineID, o.ServiceID, o.Container.ID)
+}
+
 // stopOptions converts a stop grace period duration to Docker container stop options.
 func stopOptions(gracePeriod *time.Duration) container.StopOptions {
 	if gracePeriod == nil {

pkg/client/operation/container_test.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"testing"
 
+	"github.com/charmbracelet/x/ansi"
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/volume"
 	"github.com/psviderski/uncloud/pkg/api"
@@ -12,6 +13,18 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+func TestStopContainerOperation_Format(t *testing.T) {
+	t.Parallel()
+
+	op := &StopContainerOperation{
+		ServiceName: "app",
+		ContainerID: "0f6df6593e1b0123456789abcdef",
+		MachineName: "machine-1",
+	}
+
+	assert.Equal(t, "-   stop container app/0f6df6593e1b on machine-1", ansi.Strip(op.Format()))
+}
+
 func TestReplaceContainerOperation_StopFirstPreparation(t *testing.T) {
 	t.Parallel()
 
@@ -123,6 +136,13 @@ func (c *recordingClient) RemoveContainer(
 	return nil
 }
 
+func (c *recordingClient) UpdateContainer(
+	_ context.Context, _, containerID string, _ api.UpdateContainerOptions,
+) error {
+	c.calls = append(c.calls, "update:"+containerID)
+	return nil
+}
+
 func (c *recordingClient) CreatePreDeployHookContainer(
 	context.Context, string, api.ServiceSpec, string,
 ) (api.CreateContainerResponse, error) {

test/e2e/assert.go

@@ -39,7 +39,7 @@ func assertServiceMatchesSpec(t *testing.T, svc api.Service, spec api.ServiceSpe
 
 func assertContainerMatchesSpec(t *testing.T, ctr api.ServiceContainer, spec api.ServiceSpec) {
 	desiredSpec := spec.SetDefaults()
-	status := deploy.EvalContainerSpecChange(ctr.ServiceSpec, desiredSpec)
+	status := deploy.EvalContainerChange(ctr, desiredSpec)
 	assert.Equal(t, deploy.ContainerUpToDate, status)
 	spec = renderRuntimeTemplatesForContainer(t, desiredSpec, ctr.Name)
 
@@ -48,6 +48,9 @@ func assertContainerMatchesSpec(t *testing.T, ctr api.ServiceContainer, spec api
 	assert.Equal(t, spec.Name, ctr.Config.Labels[api.LabelServiceName])
 	assert.Equal(t, spec.Mode, ctr.Config.Labels[api.LabelServiceMode])
 	assert.Contains(t, ctr.Config.Labels, api.LabelManaged)
+	for k, v := range spec.Container.Labels {
+		assert.Equal(t, v, ctr.Config.Labels[k], "Expected container label '%s'", k)
+	}
 
 	// Command and Entrypoint can only be compared if they are set in the spec.
 	// Otherwise, the container takes them from the image.

test/e2e/compose_deploy_test.go

@@ -2,7 +2,9 @@ package e2e
 
 import (
 	"context"
+	"fmt"
 	"testing"
+	"time"
 
 	"github.com/docker/docker/api/types/mount"
 	"github.com/docker/docker/api/types/volume"
@@ -10,6 +12,7 @@ import (
 	"github.com/psviderski/uncloud/pkg/api"
 	"github.com/psviderski/uncloud/pkg/client/compose"
 	"github.com/psviderski/uncloud/pkg/client/deploy"
+	"github.com/psviderski/uncloud/pkg/client/operation"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -548,6 +551,85 @@ func TestComposeDeployment(t *testing.T) {
 			"Service containers should be on machines 1 and 3 from comma-separated list")
 	})
 
+	t.Run("labels and in-place update of service labels and resources", func(t *testing.T) {
+		t.Parallel()
+
+		name := "test-compose-labels"
+		t.Cleanup(func() {
+			removeServices(t, cli, name)
+		})
+
+		composeYAML := func(tier, memLimit string) string {
+			return fmt.Sprintf(`
+services:
+  %s:
+    image: portainer/pause:3.9
+    mem_limit: %s
+    labels:
+      com.example.team: web
+    deploy:
+      replicas: 2
+      labels:
+        tier: %s
+`, name, memLimit, tier)
+		}
+
+		project, err := compose.LoadProjectFromContent(ctx, composeYAML("frontend", "64m"))
+		require.NoError(t, err)
+		deployment, err := compose.NewDeployment(ctx, cli, project)
+		require.NoError(t, err)
+		require.NoError(t, deployment.Run(ctx))
+
+		svc, err := cli.InspectService(ctx, name)
+		require.NoError(t, err)
+		expectedSpec := api.ServiceSpec{
+			Name: name,
+			Mode: api.ServiceModeReplicated,
+			Container: api.ContainerSpec{
+				Image:     "portainer/pause:3.9",
+				Labels:    map[string]string{"com.example.team": "web"},
+				Resources: api.ContainerResources{Memory: 64 * 1024 * 1024},
+			},
+			Labels:   map[string]string{"tier": "frontend"},
+			Replicas: 2,
+		}
+		assertServiceMatchesSpec(t, svc, expectedSpec)
+		for _, mc := range svc.Containers {
+			assert.NotContains(t, mc.Container.Config.Labels, "tier",
+				"Service labels must not be applied to containers")
+		}
+		containers := serviceContainerIDs(svc)
+
+		// Changing the service labels and memory limit should update the containers in place.
+		project, err = compose.LoadProjectFromContent(ctx, composeYAML("backend", "128m"))
+		require.NoError(t, err)
+		deployment, err = compose.NewDeployment(ctx, cli, project)
+		require.NoError(t, err)
+
+		plan, err := deployment.Plan(ctx)
+		require.NoError(t, err)
+		require.Len(t, plan.Services, 1)
+		require.Len(t, plan.Services[0].Operations, 2)
+		for _, op := range plan.Services[0].Operations {
+			assert.IsType(t, &operation.UpdateContainerOperation{}, op)
+		}
+		require.NoError(t, deployment.Run(ctx))
+
+		// The updated spec propagates to the cluster store asynchronously.
+		expectedSpec.Labels = map[string]string{"tier": "backend"}
+		expectedSpec.Container.Resources.Memory = 128 * 1024 * 1024
+		assert.EventuallyWithT(t, func(c *assert.CollectT) {
+			svc, err = cli.InspectService(ctx, name)
+			require.NoError(c, err)
+			for _, mc := range svc.Containers {
+				assert.Equal(c, expectedSpec.Labels, mc.Container.ServiceSpec.Labels)
+				assert.Equal(c, expectedSpec.Container.Resources.Memory, mc.Container.HostConfig.Memory)
+			}
+		}, 10*time.Second, 200*time.Millisecond)
+		assertServiceMatchesSpec(t, svc, expectedSpec)
+		assert.Equal(t, containers, serviceContainerIDs(svc), "Expected containers to be updated in place")
+	})
+
 	// Catches regression: https://github.com/psviderski/uncloud/issues/176
 	t.Run("plan new deployment with volumes and recreate strategy", func(t *testing.T) {
 		t.Parallel()

test/e2e/service_test.go

@@ -1761,6 +1761,90 @@ func TestServiceLifecycle(t *testing.T) {
 		require.ErrorIs(t, err, api.ErrNotFound)
 	})
 
+	t.Run("update container in place", func(t *testing.T) {
+		t.Parallel()
+
+		serviceID := newServiceID()
+		spec := api.ServiceSpec{
+			Name: "container-update",
+			Container: api.ContainerSpec{
+				Image: "portainer/pause:latest",
+				Resources: api.ContainerResources{
+					CPU:    100 * api.MilliCore,
+					Memory: 20 * units.MiB,
+				},
+			},
+			Labels: map[string]string{"tier": "frontend"},
+		}
+
+		ctr, err := cli.CreateContainer(ctx, serviceID, spec, c.Machines[0].Name)
+		require.NoError(t, err)
+
+		t.Cleanup(func() {
+			err := cli.RemoveContainer(ctx, serviceID, ctr.ID, container.RemoveOptions{Force: true})
+			if !errors.Is(err, api.ErrNotFound) {
+				require.NoError(t, err)
+			}
+		})
+
+		require.NoError(t, cli.StartContainer(ctx, serviceID, ctr.ID))
+
+		// Update the CPU and memory limits and replace the service labels.
+		err = cli.UpdateContainer(ctx, serviceID, ctr.ID, api.UpdateContainerOptions{
+			CPU:               new(int64(200 * api.MilliCore)),
+			Memory:            new(int64(40 * units.MiB)),
+			MemoryReservation: new(int64(10 * units.MiB)),
+			ServiceLabels:     &map[string]string{"tier": "backend"},
+		})
+		require.NoError(t, err)
+
+		spec.Container.Resources.CPU = 200 * api.MilliCore
+		spec.Container.Resources.Memory = 40 * units.MiB
+		spec.Container.Resources.MemoryReservation = 10 * units.MiB
+		spec.Labels = map[string]string{"tier": "backend"}
+
+		mc, err := cli.InspectContainer(ctx, serviceID, ctr.ID)
+		require.NoError(t, err)
+		assert.Equal(t, ctr.ID, mc.Container.ID, "Expected container to be updated in place")
+		assert.True(t, mc.Container.State.Running, "Expected container to keep running")
+		assertContainerMatchesSpec(t, mc.Container, spec)
+		assert.Equal(t, spec.Labels, mc.Container.ServiceSpec.Labels)
+		assert.EqualValues(t, 80*units.MiB, mc.Container.HostConfig.MemorySwap,
+			"Expected swap limit to be twice the memory limit")
+
+		// Remove all service labels and leave the limits unchanged.
+		err = cli.UpdateContainer(ctx, serviceID, ctr.ID, api.UpdateContainerOptions{
+			ServiceLabels: &map[string]string{},
+		})
+		require.NoError(t, err)
+		spec.Labels = nil
+
+		mc, err = cli.InspectContainer(ctx, serviceID, ctr.ID)
+		require.NoError(t, err)
+		assertContainerMatchesSpec(t, mc.Container, spec)
+		assert.Nil(t, mc.Container.ServiceSpec.Labels)
+
+		// A limit can't be removed without recreating the container.
+		err = cli.UpdateContainer(ctx, serviceID, ctr.ID, api.UpdateContainerOptions{Memory: new(int64(0))})
+		require.ErrorContains(t, err, "memory limit can't be removed")
+
+		mc, err = cli.InspectContainer(ctx, serviceID, ctr.ID)
+		require.NoError(t, err)
+		assertContainerMatchesSpec(t, mc.Container, spec)
+
+		// Reserved service labels are rejected.
+		err = cli.UpdateContainer(ctx, serviceID, ctr.ID, api.UpdateContainerOptions{
+			ServiceLabels: &map[string]string{api.LabelManaged: ""},
+		})
+		require.ErrorContains(t, err, "reserved prefix")
+
+		require.NoError(t, cli.RemoveContainer(ctx, serviceID, ctr.ID, container.RemoveOptions{Force: true}))
+		err = cli.UpdateContainer(ctx, serviceID, ctr.ID, api.UpdateContainerOptions{
+			ServiceLabels: &map[string]string{"tier": "frontend"},
+		})
+		require.ErrorIs(t, err, api.ErrNotFound)
+	})
+
 	t.Run("1 replica", func(t *testing.T) {
 		t.Parallel()
 

website/docs/8-compose-file-reference/1-support-matrix.md

@@ -10,16 +10,16 @@ If you rely on a specific Compose feature that is not supported by Uncloud, plea
 
 :::
 
-| Feature                          | Support Status     | Notes                                                                                                                                      |
-|----------------------------------|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------|
-| **Services**                     |                    |                                                                                                                                            |
+| Feature                          | Support Status      | Notes                                                                                                                                      |
+|----------------------------------|---------------------|--------------------------------------------------------------------------------------------------------------------------------------------|
+| **Services**                     |                     |                                                                                                                                            |
 | `build`                          | ✅ Supported        | Build context and Dockerfile                                                                                                               |
 | `cap_add`                        | ✅ Supported        | Additional kernel [capabilities](https://man7.org/linux/man-pages/man7/capabilities.7.html)                                                |
 | `cap_drop`                       | ✅ Supported        | Which kernel [capabilities](https://man7.org/linux/man-pages/man7/capabilities.7.html) to drop                                             |
 | `command`                        | ✅ Supported        | Override container command                                                                                                                 |
 | `configs`                        | ✅ Supported        | File-based and inline configs                                                                                                              |
 | `cpus`                           | ✅ Supported        | CPU limit                                                                                                                                  |
-| `depends_on`                     | ⚠️ Limited         | Deployed in dependency order. Use [pre-deploy hooks](../4-guides/1-deployments/5-pre-deploy-hooks.md) for `service_completed_successfully` |
+| `depends_on`                     | ⚠️ Limited          | Deployed in dependency order. Use [pre-deploy hooks](../4-guides/1-deployments/5-pre-deploy-hooks.md) for `service_completed_successfully` |
 | `devices`                        | ✅ Supported        | Device mappings                                                                                                                            |
 | `dns`                            | ❌ Not supported    | Built-in service discovery                                                                                                                 |
 | `dns_search`                     | ❌ Not supported    | Built-in service discovery                                                                                                                 |
@@ -30,7 +30,7 @@ If you rely on a specific Compose feature that is not supported by Uncloud, plea
 | `healthcheck`                    | ✅ Supported        | Health check configuration                                                                                                                 |
 | `image`                          | ✅ Supported        | Container image specification                                                                                                              |
 | `init`                           | ✅ Supported        | Run init process in container                                                                                                              |
-| `labels`                         | ❌ Not supported    |                                                                                                                                            |
+| `labels`                         | ✅ Supported        | Docker labels on containers                                                                                                                |
 | `links`                          | ❌ Not supported    | Use service names for communication                                                                                                        |
 | `logging`                        | ✅ Supported        | Defaults to [local](https://docs.docker.com/engine/logging/drivers/local/) log driver                                                      |
 | `mem_limit`                      | ✅ Supported        | Memory limit                                                                                                                               |
@@ -39,10 +39,10 @@ If you rely on a specific Compose feature that is not supported by Uncloud, plea
 | `memswap_limit`                  | ❌ Not supported    |                                                                                                                                            |
 | `networks`                       | ❌ Not supported    | All containers share cluster network                                                                                                       |
 | `pid`                            | ✅ Supported        | Set the PID namespace mode, `pid: host` only                                                                                               |
-| `ports`                          | ⚠️ Limited         | `mode: host` only, use [`x-ports`](2-extensions.md#x-ports) for HTTP/HTTPS                                                                 |
+| `ports`                          | ⚠️ Limited          | `mode: host` only, use [`x-ports`](2-extensions.md#x-ports) for HTTP/HTTPS                                                                 |
 | `privileged`                     | ✅ Supported        | Run containers in privileged mode                                                                                                          |
 | `pull_policy`                    | ✅ Supported        | `always`, `missing`, `never`                                                                                                               |
-| `secrets`                        | ⚠️ Limited         | Reference secrets in `environment`, see [Secrets](../3-concepts/8-secrets.md). File mounts not supported                                   |
+| `secrets`                        | ⚠️ Limited          | Reference secrets in `environment`, see [Secrets](../3-concepts/8-secrets.md). File mounts not supported                                   |
 | `security_opt`                   | ❌ Not supported    |                                                                                                                                            |
 | `shm_size`                       | ✅ Supported        | Shared memory size                                                                                                                         |
 | `stdin_open`                     | ✅ Supported        | Allocate standard input and keep it open                                                                                                   |
@@ -53,28 +53,28 @@ If you rely on a specific Compose feature that is not supported by Uncloud, plea
 | `ulimits`                        | ✅ Supported        | Resource limits                                                                                                                            |
 | `user`                           | ✅ Supported        | Set container user                                                                                                                         |
 | `volumes`                        | ✅ Supported        | Named volumes, bind mounts, tmpfs                                                                                                          |
-| **Deploy**                       |                    |                                                                                                                                            |
-| `labels`                         | ❌ Not supported    |                                                                                                                                            |
+| **Deploy**                       |                     |                                                                                                                                            |
+| `labels`                         | ✅ Supported        | Service labels, not applied to containers. Use `services.<name>.labels` to set Docker labels on containers                                 |
 | `mode`                           | ✅ Supported        | Either `global` or `replicated`                                                                                                            |
 | `placement`                      | ❌ Not supported    | Use [`x-machines`](2-extensions.md#x-machines) extension                                                                                   |
 | `replicas`                       | ✅ Supported        | Number of container replicas                                                                                                               |
-| `resources`                      | ⚠️ Limited         | CPU, memory limits and device reservations                                                                                                 |
+| `resources`                      | ⚠️ Limited          | CPU, memory limits and device reservations                                                                                                 |
 | `restart_policy`                 | ❌ Not supported    | Defaults to `unless-stopped`                                                                                                               |
 | `rollback_config`                | ❌ Not supported    | See [#151](https://github.com/psviderski/uncloud/issues/151)                                                                               |
-| `update_config`                  | ⚠️ Limited         | `order` and `monitor` supported. See [rolling deployments](../4-guides/1-deployments/4-rolling-deployments.md)                             |
-| **Volumes**                      |                    |                                                                                                                                            |
+| `update_config`                  | ⚠️ Limited          | `order` and `monitor` supported. See [rolling deployments](../4-guides/1-deployments/4-rolling-deployments.md)                             |
+| **Volumes**                      |                     |                                                                                                                                            |
 | Named volumes                    | ✅ Supported        | Docker volumes                                                                                                                             |
 | Bind mounts                      | ✅ Supported        | Host path binding with optional [runtime templates](../3-concepts/6-services/3-runtime-templates.md)                                       |
 | Tmpfs mounts                     | ✅ Supported        | In-memory filesystems                                                                                                                      |
 | Volume labels                    | ✅ Supported        | Custom labels                                                                                                                              |
 | External volumes                 | ✅ Supported        | Must exist before deployment                                                                                                               |
 | [Volume drivers][volume-drivers] | ✅ Supported        | `local` (supports [NFS][volume-nfs], [CIFS/Samba][volume-cifs]) and manually installed third-party drivers                                 |
-| **Configs**                      |                    |                                                                                                                                            |
+| **Configs**                      |                     |                                                                                                                                            |
 | File-based configs               | ✅ Supported        | Read from file                                                                                                                             |
 | Inline configs                   | ✅ Supported        | Defined in compose file                                                                                                                    |
 | External configs                 | ❌ Not supported    | Not supported                                                                                                                              |
 | Short syntax                     | ❌ Not supported    | Use long syntax only                                                                                                                       |
-| **Extensions**                   |                    |                                                                                                                                            |
+| **Extensions**                   |                     |                                                                                                                                            |
 | `x-context`                      | ✅ Uncloud-specific | Cluster context override                                                                                                                   |
 | `x-caddy`                        | ✅ Uncloud-specific | Custom Caddy configuration                                                                                                                 |
 | `x-machines`                     | ✅ Uncloud-specific | Machine placement constraints                                                                                                              |

website/docs/9-cli-reference/uc_run.md

@@ -9,49 +9,55 @@ uc run IMAGE [COMMAND...] [flags]
 ## Options
 
 ```
-      --caddyfile string    Path to a custom Caddy config (Caddyfile) for the service. Cannot be used together with non-@host published ports.
-      --cpu decimal         Maximum number of CPU cores a service container can use. Fractional values are allowed: 0.5 for half a core or 2.25 for two and a quarter cores.
-      --entrypoint string   Overwrite the default ENTRYPOINT of the image. Pass an empty string "" to reset it.
-  -e, --env strings         Set an environment variable for service containers. Can be specified multiple times.
-                            Format: VAR=value or just VAR to use the value from the local environment.
-  -h, --help                help for run
-  -m, --machine strings     Placement constraint by machine names, limiting which machines the service can run on. Can be specified multiple times or as a comma-separated list of machine names. (default is any suitable machine)
-      --memory bytes        Maximum amount of memory a service container can use. Value is a positive integer with optional unit suffix (b, k, m, g).
-                            Default unit is bytes if no suffix specified.
-                            Examples: 1073741824, 1024m, 1g (all equal 1 gibibyte)
-      --mode string         Replication mode of the service: either 'replicated' (a specified number of containers across the machines) or 'global' (one container on every machine). (default "replicated")
-  -n, --name string         Assign a name to the service. A random name is generated if not specified.
-      --privileged          Give extended privileges to service containers. This is a security risk and should be used with caution.
-  -p, --publish strings     Publish a service port to make it accessible outside the cluster. Can be specified multiple times.
-                            Format: [hostname:]container_port[/protocol] or [host_ip|host_prefix:]host_port:container_port[/protocol]@host
-                            Supported protocols: tcp, udp, http, https (default is tcp). If a hostname for http(s) port is not specified
-                            and a cluster domain is reserved, service-name.cluster-domain will be used as the hostname.
-                            Examples:
-                              -p 8080/https                       Publish port 8080 as HTTPS via reverse proxy with default service-name.cluster-domain hostname
-                              -p app.example.com:8080/https       Publish port 8080 as HTTPS via reverse proxy with custom hostname
-                              -p 53:5353/udp@host                 Bind UDP port 5353 to host port 53
-                              -p 192.168.76.0/24:53:5353/udp@host Bind UDP port 5353 to host port 53 on every host IP address
-                                                                  contained in the prefix 192.168.76.0/24
-      --pull string         Pull image from the registry before running service containers ('always', 'missing', 'never'). (default "missing")
-      --replicas uint       Number of containers to run for the service. Only valid for a replicated service. (default 1)
-      --shm-size bytes      Maximum amount of shared memory (mounted at /dev/shm) a service container can use. Value is a positive integer
-                            with optional unit suffix (b, k, m, g). Default unit is bytes if no suffix specified.
-                            Examples: 1073741824, 1024m, 1g (all equal 1 gibibyte)
-      --ulimit strings      Set resource limits for service containers. Can be specified multiple times.
-                            Format: type=soft_limit[:hard_limit]. If hard limit is not specified, soft limit is used for both.
-                            Examples:
-                              --ulimit nofile=1024:2048  Set soft limit to 1024 and hard limit to 2048 for number of open files
-                              --ulimit nproc=65535       Set both soft and hard limits to 65535 for number of processes
-  -u, --user string         User name or UID and optionally group name or GID used for running the command inside service containers.
-                            Format: USER[:GROUP] or UID[:GID]. If not specified, the user is set to the default user of the image.
-  -v, --volume strings      Mount a data volume or host path into service containers. Service containers will be scheduled on the machine(s) where
-                            the volume is located. Can be specified multiple times.
-                            Format: volume_name:/container/path[:ro|volume-nocopy] or /host/path:/container/path[:ro]
-                            Host and container paths support runtime templates such as {{.Container.Name}}.
-                            Examples:
-                              -v postgres-data:/var/lib/postgresql/data  Mount volume 'postgres-data' to /var/lib/postgresql/data in container
-                              -v /data/uploads:/app/uploads         	 Bind mount /data/uploads host directory to /app/uploads in container
-                              -v /host/path:/container/path:ro 		 Bind mount a host directory or file as read-only
+      --caddyfile string              Path to a custom Caddy config (Caddyfile) for the service. Cannot be used together with non-@host published ports.
+      --container-label stringArray   Set a Docker label on service containers. Can be specified multiple times.
+                                      Format: key=value or just key for an empty value.
+      --cpu decimal                   Maximum number of CPU cores a service container can use. Fractional values are allowed: 0.5 for half a core or 2.25 for two and a quarter cores.
+      --entrypoint string             Overwrite the default ENTRYPOINT of the image. Pass an empty string "" to reset it.
+  -e, --env strings                   Set an environment variable for service containers. Can be specified multiple times.
+                                      Format: VAR=value or just VAR to use the value from the local environment.
+  -h, --help                          help for run
+  -l, --label stringArray             Set a service label. Service labels aren't applied to Docker containers, use --container-label for that.
+                                      Can be specified multiple times. Format: key=value or just key for an empty value.
+  -m, --machine strings               Placement constraint by machine names, limiting which machines the service can run on. Can be specified multiple times or as a comma-separated list of machine names. (default is any suitable machine)
+      --memory bytes                  Maximum amount of memory a service container can use. Value is a positive integer with optional unit suffix (b, k, m, g).
+                                      Default unit is bytes if no suffix specified.
+                                      Examples: 1073741824, 1024m, 1g (all equal 1 gibibyte)
+      --memory-reservation bytes      Minimum amount of memory reserved for a service container. Value is a positive integer with optional unit suffix (b, k, m, g).
+                                      Default unit is bytes if no suffix specified.
+      --mode string                   Replication mode of the service: either 'replicated' (a specified number of containers across the machines) or 'global' (one container on every machine). (default "replicated")
+  -n, --name string                   Assign a name to the service. A random name is generated if not specified.
+      --privileged                    Give extended privileges to service containers. This is a security risk and should be used with caution.
+  -p, --publish strings               Publish a service port to make it accessible outside the cluster. Can be specified multiple times.
+                                      Format: [hostname:]container_port[/protocol] or [host_ip|host_prefix:]host_port:container_port[/protocol]@host
+                                      Supported protocols: tcp, udp, http, https (default is tcp). If a hostname for http(s) port is not specified
+                                      and a cluster domain is reserved, service-name.cluster-domain will be used as the hostname.
+                                      Examples:
+                                        -p 8080/https                       Publish port 8080 as HTTPS via reverse proxy with default service-name.cluster-domain hostname
+                                        -p app.example.com:8080/https       Publish port 8080 as HTTPS via reverse proxy with custom hostname
+                                        -p 53:5353/udp@host                 Bind UDP port 5353 to host port 53
+                                        -p 192.168.76.0/24:53:5353/udp@host Bind UDP port 5353 to host port 53 on every host IP address
+                                                                            contained in the prefix 192.168.76.0/24
+      --pull string                   Pull image from the registry before running service containers ('always', 'missing', 'never'). (default "missing")
+      --replicas uint                 Number of containers to run for the service. Only valid for a replicated service. (default 1)
+      --shm-size bytes                Maximum amount of shared memory (mounted at /dev/shm) a service container can use. Value is a positive integer
+                                      with optional unit suffix (b, k, m, g). Default unit is bytes if no suffix specified.
+                                      Examples: 1073741824, 1024m, 1g (all equal 1 gibibyte)
+      --ulimit strings                Set resource limits for service containers. Can be specified multiple times.
+                                      Format: type=soft_limit[:hard_limit]. If hard limit is not specified, soft limit is used for both.
+                                      Examples:
+                                        --ulimit nofile=1024:2048  Set soft limit to 1024 and hard limit to 2048 for number of open files
+                                        --ulimit nproc=65535       Set both soft and hard limits to 65535 for number of processes
+  -u, --user string                   User name or UID and optionally group name or GID used for running the command inside service containers.
+                                      Format: USER[:GROUP] or UID[:GID]. If not specified, the user is set to the default user of the image.
+  -v, --volume strings                Mount a data volume or host path into service containers. Service containers will be scheduled on the machine(s) where
+                                      the volume is located. Can be specified multiple times.
+                                      Format: volume_name:/container/path[:ro|volume-nocopy] or /host/path:/container/path[:ro]
+                                      Host and container paths support runtime templates such as {{.Container.Name}}.
+                                      Examples:
+                                        -v postgres-data:/var/lib/postgresql/data  Mount volume 'postgres-data' to /var/lib/postgresql/data in container
+                                        -v /data/uploads:/app/uploads         	 Bind mount /data/uploads host directory to /app/uploads in container
+                                        -v /host/path:/container/path:ro 		 Bind mount a host directory or file as read-only
 ```
 
 ## Options inherited from parent commands

website/docs/9-cli-reference/uc_service.md

@@ -29,4 +29,5 @@ Manage services in the cluster.
 * [uc service scale](uc_service_scale.md)	 - Scale a replicated service by changing the number of replicas.
 * [uc service start](uc_service_start.md)	 - Start one or more services.
 * [uc service stop](uc_service_stop.md)	 - Stop one or more services.
+* [uc service update](uc_service_update.md)	 - Update a service in place without recreating its containers.
 

website/docs/9-cli-reference/uc_service_run.md

@@ -9,49 +9,55 @@ uc service run IMAGE [COMMAND...] [flags]
 ## Options
 
 ```
-      --caddyfile string    Path to a custom Caddy config (Caddyfile) for the service. Cannot be used together with non-@host published ports.
-      --cpu decimal         Maximum number of CPU cores a service container can use. Fractional values are allowed: 0.5 for half a core or 2.25 for two and a quarter cores.
-      --entrypoint string   Overwrite the default ENTRYPOINT of the image. Pass an empty string "" to reset it.
-  -e, --env strings         Set an environment variable for service containers. Can be specified multiple times.
-                            Format: VAR=value or just VAR to use the value from the local environment.
-  -h, --help                help for run
-  -m, --machine strings     Placement constraint by machine names, limiting which machines the service can run on. Can be specified multiple times or as a comma-separated list of machine names. (default is any suitable machine)
-      --memory bytes        Maximum amount of memory a service container can use. Value is a positive integer with optional unit suffix (b, k, m, g).
-                            Default unit is bytes if no suffix specified.
-                            Examples: 1073741824, 1024m, 1g (all equal 1 gibibyte)
-      --mode string         Replication mode of the service: either 'replicated' (a specified number of containers across the machines) or 'global' (one container on every machine). (default "replicated")
-  -n, --name string         Assign a name to the service. A random name is generated if not specified.
-      --privileged          Give extended privileges to service containers. This is a security risk and should be used with caution.
-  -p, --publish strings     Publish a service port to make it accessible outside the cluster. Can be specified multiple times.
-                            Format: [hostname:]container_port[/protocol] or [host_ip|host_prefix:]host_port:container_port[/protocol]@host
-                            Supported protocols: tcp, udp, http, https (default is tcp). If a hostname for http(s) port is not specified
-                            and a cluster domain is reserved, service-name.cluster-domain will be used as the hostname.
-                            Examples:
-                              -p 8080/https                       Publish port 8080 as HTTPS via reverse proxy with default service-name.cluster-domain hostname
-                              -p app.example.com:8080/https       Publish port 8080 as HTTPS via reverse proxy with custom hostname
-                              -p 53:5353/udp@host                 Bind UDP port 5353 to host port 53
-                              -p 192.168.76.0/24:53:5353/udp@host Bind UDP port 5353 to host port 53 on every host IP address
-                                                                  contained in the prefix 192.168.76.0/24
-      --pull string         Pull image from the registry before running service containers ('always', 'missing', 'never'). (default "missing")
-      --replicas uint       Number of containers to run for the service. Only valid for a replicated service. (default 1)
-      --shm-size bytes      Maximum amount of shared memory (mounted at /dev/shm) a service container can use. Value is a positive integer
-                            with optional unit suffix (b, k, m, g). Default unit is bytes if no suffix specified.
-                            Examples: 1073741824, 1024m, 1g (all equal 1 gibibyte)
-      --ulimit strings      Set resource limits for service containers. Can be specified multiple times.
-                            Format: type=soft_limit[:hard_limit]. If hard limit is not specified, soft limit is used for both.
-                            Examples:
-                              --ulimit nofile=1024:2048  Set soft limit to 1024 and hard limit to 2048 for number of open files
-                              --ulimit nproc=65535       Set both soft and hard limits to 65535 for number of processes
-  -u, --user string         User name or UID and optionally group name or GID used for running the command inside service containers.
-                            Format: USER[:GROUP] or UID[:GID]. If not specified, the user is set to the default user of the image.
-  -v, --volume strings      Mount a data volume or host path into service containers. Service containers will be scheduled on the machine(s) where
-                            the volume is located. Can be specified multiple times.
-                            Format: volume_name:/container/path[:ro|volume-nocopy] or /host/path:/container/path[:ro]
-                            Host and container paths support runtime templates such as {{.Container.Name}}.
-                            Examples:
-                              -v postgres-data:/var/lib/postgresql/data  Mount volume 'postgres-data' to /var/lib/postgresql/data in container
-                              -v /data/uploads:/app/uploads         	 Bind mount /data/uploads host directory to /app/uploads in container
-                              -v /host/path:/container/path:ro 		 Bind mount a host directory or file as read-only
+      --caddyfile string              Path to a custom Caddy config (Caddyfile) for the service. Cannot be used together with non-@host published ports.
+      --container-label stringArray   Set a Docker label on service containers. Can be specified multiple times.
+                                      Format: key=value or just key for an empty value.
+      --cpu decimal                   Maximum number of CPU cores a service container can use. Fractional values are allowed: 0.5 for half a core or 2.25 for two and a quarter cores.
+      --entrypoint string             Overwrite the default ENTRYPOINT of the image. Pass an empty string "" to reset it.
+  -e, --env strings                   Set an environment variable for service containers. Can be specified multiple times.
+                                      Format: VAR=value or just VAR to use the value from the local environment.
+  -h, --help                          help for run
+  -l, --label stringArray             Set a service label. Service labels aren't applied to Docker containers, use --container-label for that.
+                                      Can be specified multiple times. Format: key=value or just key for an empty value.
+  -m, --machine strings               Placement constraint by machine names, limiting which machines the service can run on. Can be specified multiple times or as a comma-separated list of machine names. (default is any suitable machine)
+      --memory bytes                  Maximum amount of memory a service container can use. Value is a positive integer with optional unit suffix (b, k, m, g).
+                                      Default unit is bytes if no suffix specified.
+                                      Examples: 1073741824, 1024m, 1g (all equal 1 gibibyte)
+      --memory-reservation bytes      Minimum amount of memory reserved for a service container. Value is a positive integer with optional unit suffix (b, k, m, g).
+                                      Default unit is bytes if no suffix specified.
+      --mode string                   Replication mode of the service: either 'replicated' (a specified number of containers across the machines) or 'global' (one container on every machine). (default "replicated")
+  -n, --name string                   Assign a name to the service. A random name is generated if not specified.
+      --privileged                    Give extended privileges to service containers. This is a security risk and should be used with caution.
+  -p, --publish strings               Publish a service port to make it accessible outside the cluster. Can be specified multiple times.
+                                      Format: [hostname:]container_port[/protocol] or [host_ip|host_prefix:]host_port:container_port[/protocol]@host
+                                      Supported protocols: tcp, udp, http, https (default is tcp). If a hostname for http(s) port is not specified
+                                      and a cluster domain is reserved, service-name.cluster-domain will be used as the hostname.
+                                      Examples:
+                                        -p 8080/https                       Publish port 8080 as HTTPS via reverse proxy with default service-name.cluster-domain hostname
+                                        -p app.example.com:8080/https       Publish port 8080 as HTTPS via reverse proxy with custom hostname
+                                        -p 53:5353/udp@host                 Bind UDP port 5353 to host port 53
+                                        -p 192.168.76.0/24:53:5353/udp@host Bind UDP port 5353 to host port 53 on every host IP address
+                                                                            contained in the prefix 192.168.76.0/24
+      --pull string                   Pull image from the registry before running service containers ('always', 'missing', 'never'). (default "missing")
+      --replicas uint                 Number of containers to run for the service. Only valid for a replicated service. (default 1)
+      --shm-size bytes                Maximum amount of shared memory (mounted at /dev/shm) a service container can use. Value is a positive integer
+                                      with optional unit suffix (b, k, m, g). Default unit is bytes if no suffix specified.
+                                      Examples: 1073741824, 1024m, 1g (all equal 1 gibibyte)
+      --ulimit strings                Set resource limits for service containers. Can be specified multiple times.
+                                      Format: type=soft_limit[:hard_limit]. If hard limit is not specified, soft limit is used for both.
+                                      Examples:
+                                        --ulimit nofile=1024:2048  Set soft limit to 1024 and hard limit to 2048 for number of open files
+                                        --ulimit nproc=65535       Set both soft and hard limits to 65535 for number of processes
+  -u, --user string                   User name or UID and optionally group name or GID used for running the command inside service containers.
+                                      Format: USER[:GROUP] or UID[:GID]. If not specified, the user is set to the default user of the image.
+  -v, --volume strings                Mount a data volume or host path into service containers. Service containers will be scheduled on the machine(s) where
+                                      the volume is located. Can be specified multiple times.
+                                      Format: volume_name:/container/path[:ro|volume-nocopy] or /host/path:/container/path[:ro]
+                                      Host and container paths support runtime templates such as {{.Container.Name}}.
+                                      Examples:
+                                        -v postgres-data:/var/lib/postgresql/data  Mount volume 'postgres-data' to /var/lib/postgresql/data in container
+                                        -v /data/uploads:/app/uploads         	 Bind mount /data/uploads host directory to /app/uploads in container
+                                        -v /host/path:/container/path:ro 		 Bind mount a host directory or file as read-only
 ```
 
 ## Options inherited from parent commands

website/docs/9-cli-reference/uc_service_update.md

@@ -0,0 +1,54 @@
+# uc service update
+
+Update a service in place without recreating its containers.
+
+## Synopsis
+
+Update service configuration in place without recreating its containers.
+
+A CPU or memory limit can be changed but not removed. To remove a limit or change anything else,
+redeploy the service with 'uc deploy'
+
+```
+uc service update SERVICE [flags]
+```
+
+## Examples
+
+```
+  # Change the CPU and memory limits.
+  uc service update web --cpu 0.5 --memory 512m
+
+  # Add or change a service label and remove another one.
+  uc service update web --label-add tier=frontend --label-rm legacy
+```
+
+## Options
+
+```
+      --cpu decimal                Maximum number of CPU cores a service container can use.
+                                   Fractional values are allowed: 0.5 for half a core or 2.25 for two and a quarter cores.
+  -h, --help                       help for update
+      --label-add stringArray      Add or change a service label. Can be specified multiple times.
+                                   Format: key=value or just key for an empty value.
+      --label-rm stringArray       Remove a service label by its key. Can be specified multiple times.
+      --memory bytes               Maximum amount of memory a service container can use. Value is a positive integer with
+                                   optional unit suffix (b, k, m, g). Default unit is bytes if no suffix specified.
+                                   Examples: 1073741824, 1024m, 1g (all equal 1 gibibyte)
+      --memory-reservation bytes   Minimum amount of memory reserved for a service container. Value is a positive integer with
+                                   optional unit suffix (b, k, m, g). Default unit is bytes if no suffix specified.
+```
+
+## Options inherited from parent commands
+
+```
+      --connect string          Connect to a remote cluster machine without using the Uncloud configuration file. [$UNCLOUD_CONNECT]
+                                Format: [ssh://]user@host[:port], ssh+go://user@host[:port], tcp://host:port, or unix:///path/to/uncloud.sock
+  -c, --context string          Name of the cluster context to use (default is the current context). [$UNCLOUD_CONTEXT]
+      --uncloud-config string   Path to the Uncloud configuration file. [$UNCLOUD_CONFIG] (default "~/.config/uncloud/config.yaml")
+```
+
+## See also
+
+* [uc service](uc_service.md)	 - Manage services in the cluster.
+