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moby--moby/cli/command/container/update.go

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package container
import (
"fmt"
"strings"
"golang.org/x/net/context"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/cli"
"github.com/docker/docker/cli/command"
runconfigopts "github.com/docker/docker/runconfig/opts"
"github.com/docker/go-units"
"github.com/spf13/cobra"
)
type updateOptions struct {
blkioWeight uint16
cpuPeriod int64
cpuQuota int64
cpuRealtimePeriod int64
cpuRealtimeRuntime int64
cpusetCpus string
cpusetMems string
cpuShares int64
memoryString string
memoryReservation string
memorySwap string
kernelMemory string
restartPolicy string
nFlag int
containers []string
}
// NewUpdateCommand creates a new cobra.Command for `docker update`
func NewUpdateCommand(dockerCli *command.DockerCli) *cobra.Command {
var opts updateOptions
cmd := &cobra.Command{
Use: "update [OPTIONS] CONTAINER [CONTAINER...]",
Short: "Update configuration of one or more containers",
Args: cli.RequiresMinArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
opts.containers = args
opts.nFlag = cmd.Flags().NFlag()
return runUpdate(dockerCli, &opts)
},
}
flags := cmd.Flags()
flags.Uint16Var(&opts.blkioWeight, "blkio-weight", 0, "Block IO (relative weight), between 10 and 1000, or 0 to disable (default 0)")
flags.Int64Var(&opts.cpuPeriod, "cpu-period", 0, "Limit CPU CFS (Completely Fair Scheduler) period")
flags.Int64Var(&opts.cpuQuota, "cpu-quota", 0, "Limit CPU CFS (Completely Fair Scheduler) quota")
flags.Int64Var(&opts.cpuRealtimePeriod, "cpu-rt-period", 0, "Limit the CPU real-time period in microseconds")
flags.Int64Var(&opts.cpuRealtimeRuntime, "cpu-rt-runtime", 0, "Limit the CPU real-time runtime in microseconds")
flags.StringVar(&opts.cpusetCpus, "cpuset-cpus", "", "CPUs in which to allow execution (0-3, 0,1)")
flags.StringVar(&opts.cpusetMems, "cpuset-mems", "", "MEMs in which to allow execution (0-3, 0,1)")
flags.Int64VarP(&opts.cpuShares, "cpu-shares", "c", 0, "CPU shares (relative weight)")
flags.StringVarP(&opts.memoryString, "memory", "m", "", "Memory limit")
flags.StringVar(&opts.memoryReservation, "memory-reservation", "", "Memory soft limit")
flags.StringVar(&opts.memorySwap, "memory-swap", "", "Swap limit equal to memory plus swap: '-1' to enable unlimited swap")
flags.StringVar(&opts.kernelMemory, "kernel-memory", "", "Kernel memory limit")
flags.StringVar(&opts.restartPolicy, "restart", "", "Restart policy to apply when a container exits")
return cmd
}
func runUpdate(dockerCli *command.DockerCli, opts *updateOptions) error {
var err error
if opts.nFlag == 0 {
return fmt.Errorf("You must provide one or more flags when using this command.")
}
var memory int64
if opts.memoryString != "" {
memory, err = units.RAMInBytes(opts.memoryString)
if err != nil {
return err
}
}
var memoryReservation int64
if opts.memoryReservation != "" {
memoryReservation, err = units.RAMInBytes(opts.memoryReservation)
if err != nil {
return err
}
}
var memorySwap int64
if opts.memorySwap != "" {
if opts.memorySwap == "-1" {
memorySwap = -1
} else {
memorySwap, err = units.RAMInBytes(opts.memorySwap)
if err != nil {
return err
}
}
}
var kernelMemory int64
if opts.kernelMemory != "" {
kernelMemory, err = units.RAMInBytes(opts.kernelMemory)
if err != nil {
return err
}
}
var restartPolicy containertypes.RestartPolicy
if opts.restartPolicy != "" {
restartPolicy, err = runconfigopts.ParseRestartPolicy(opts.restartPolicy)
if err != nil {
return err
}
}
resources := containertypes.Resources{
BlkioWeight: opts.blkioWeight,
CpusetCpus: opts.cpusetCpus,
CpusetMems: opts.cpusetMems,
CPUShares: opts.cpuShares,
Memory: memory,
MemoryReservation: memoryReservation,
MemorySwap: memorySwap,
KernelMemory: kernelMemory,
CPUPeriod: opts.cpuPeriod,
CPUQuota: opts.cpuQuota,
CPURealtimePeriod: opts.cpuRealtimePeriod,
CPURealtimeRuntime: opts.cpuRealtimeRuntime,
}
updateConfig := containertypes.UpdateConfig{
Resources: resources,
RestartPolicy: restartPolicy,
}
ctx := context.Background()
var (
warns []string
errs []string
)
for _, container := range opts.containers {
r, err := dockerCli.Client().ContainerUpdate(ctx, container, updateConfig)
if err != nil {
errs = append(errs, err.Error())
} else {
fmt.Fprintf(dockerCli.Out(), "%s\n", container)
}
warns = append(warns, r.Warnings...)
}
if len(warns) > 0 {
fmt.Fprintf(dockerCli.Out(), "%s", strings.Join(warns, "\n"))
}
if len(errs) > 0 {
return fmt.Errorf("%s", strings.Join(errs, "\n"))
}
return nil
}