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start.go
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start.go
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package daemon
import (
"context"
"runtime"
"time"
"github.com/docker/docker/api/types"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/container"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// ContainerStart starts a container.
func (daemon *Daemon) ContainerStart(name string, hostConfig *containertypes.HostConfig, checkpoint string, checkpointDir string) error {
if checkpoint != "" && !daemon.HasExperimental() {
return validationError{errors.New("checkpoint is only supported in experimental mode")}
}
container, err := daemon.GetContainer(name)
if err != nil {
return err
}
validateState := func() error {
container.Lock()
defer container.Unlock()
if container.Paused {
return stateConflictError{errors.New("cannot start a paused container, try unpause instead")}
}
if container.Running {
return containerNotModifiedError{running: true}
}
if container.RemovalInProgress || container.Dead {
return stateConflictError{errors.New("container is marked for removal and cannot be started")}
}
return nil
}
if err := validateState(); err != nil {
return err
}
// Windows does not have the backwards compatibility issue here.
if runtime.GOOS != "windows" {
// This is kept for backward compatibility - hostconfig should be passed when
// creating a container, not during start.
if hostConfig != nil {
logrus.Warn("DEPRECATED: Setting host configuration options when the container starts is deprecated and has been removed in Docker 1.12")
oldNetworkMode := container.HostConfig.NetworkMode
if err := daemon.setSecurityOptions(container, hostConfig); err != nil {
return validationError{err}
}
if err := daemon.mergeAndVerifyLogConfig(&hostConfig.LogConfig); err != nil {
return validationError{err}
}
if err := daemon.setHostConfig(container, hostConfig); err != nil {
return validationError{err}
}
newNetworkMode := container.HostConfig.NetworkMode
if string(oldNetworkMode) != string(newNetworkMode) {
// if user has change the network mode on starting, clean up the
// old networks. It is a deprecated feature and has been removed in Docker 1.12
container.NetworkSettings.Networks = nil
container.Lock()
if err := container.CheckpointTo(daemon.containersReplica); err != nil {
container.Unlock()
return systemError{err}
}
container.Unlock()
}
container.InitDNSHostConfig()
}
} else {
if hostConfig != nil {
return validationError{errors.New("Supplying a hostconfig on start is not supported. It should be supplied on create")}
}
}
// check if hostConfig is in line with the current system settings.
// It may happen cgroups are umounted or the like.
if _, err = daemon.verifyContainerSettings(container.OS, container.HostConfig, nil, false); err != nil {
return validationError{err}
}
// Adapt for old containers in case we have updates in this function and
// old containers never have chance to call the new function in create stage.
if hostConfig != nil {
if err := daemon.adaptContainerSettings(container.HostConfig, false); err != nil {
return validationError{err}
}
}
if err := daemon.containerStart(container, checkpoint, checkpointDir, true); err != nil {
return err
}
return nil
}
// containerStart prepares the container to run by setting up everything the
// container needs, such as storage and networking, as well as links
// between containers. The container is left waiting for a signal to
// begin running.
func (daemon *Daemon) containerStart(container *container.Container, checkpoint string, checkpointDir string, resetRestartManager bool) (err error) {
start := time.Now()
container.Lock()
defer container.Unlock()
if resetRestartManager && container.Running { // skip this check if already in restarting step and resetRestartManager==false
return nil
}
if container.RemovalInProgress || container.Dead {
return stateConflictError{errors.New("container is marked for removal and cannot be started")}
}
if checkpointDir != "" {
// TODO(mlaventure): how would we support that?
return notAllowedError{errors.New("custom checkpointdir is not supported")}
}
// if we encounter an error during start we need to ensure that any other
// setup has been cleaned up properly
defer func() {
if err != nil {
container.SetError(err)
// if no one else has set it, make sure we don't leave it at zero
if container.ExitCode() == 0 {
container.SetExitCode(128)
}
if err := container.CheckpointTo(daemon.containersReplica); err != nil {
logrus.Errorf("%s: failed saving state on start failure: %v", container.ID, err)
}
container.Reset(false)
daemon.Cleanup(container)
// if containers AutoRemove flag is set, remove it after clean up
if container.HostConfig.AutoRemove {
container.Unlock()
if err := daemon.ContainerRm(container.ID, &types.ContainerRmConfig{ForceRemove: true, RemoveVolume: true}); err != nil {
logrus.Errorf("can't remove container %s: %v", container.ID, err)
}
container.Lock()
}
}
}()
if err := daemon.conditionalMountOnStart(container); err != nil {
return err
}
if err := daemon.initializeNetworking(container); err != nil {
return err
}
spec, err := daemon.createSpec(container)
if err != nil {
return systemError{err}
}
if resetRestartManager {
container.ResetRestartManager(true)
}
if daemon.saveApparmorConfig(container); err != nil {
return err
}
if checkpoint != "" {
checkpointDir, err = getCheckpointDir(checkpointDir, checkpoint, container.Name, container.ID, container.CheckpointDir(), false)
if err != nil {
return err
}
}
createOptions, err := daemon.getLibcontainerdCreateOptions(container)
if err != nil {
return err
}
err = daemon.containerd.Create(context.Background(), container.ID, spec, createOptions)
if err != nil {
return translateContainerdStartErr(container.Path, container.SetExitCode, err)
}
// TODO(mlaventure): we need to specify checkpoint options here
pid, err := daemon.containerd.Start(context.Background(), container.ID, checkpointDir,
container.StreamConfig.Stdin() != nil || container.Config.Tty,
container.InitializeStdio)
if err != nil {
if err := daemon.containerd.Delete(context.Background(), container.ID); err != nil {
logrus.WithError(err).WithField("container", container.ID).
Error("failed to delete failed start container")
}
return translateContainerdStartErr(container.Path, container.SetExitCode, err)
}
container.SetRunning(pid, true)
container.HasBeenManuallyStopped = false
container.HasBeenStartedBefore = true
daemon.setStateCounter(container)
daemon.initHealthMonitor(container)
if err := container.CheckpointTo(daemon.containersReplica); err != nil {
logrus.WithError(err).WithField("container", container.ID).
Errorf("failed to store container")
}
daemon.LogContainerEvent(container, "start")
containerActions.WithValues("start").UpdateSince(start)
return nil
}
// Cleanup releases any network resources allocated to the container along with any rules
// around how containers are linked together. It also unmounts the container's root filesystem.
func (daemon *Daemon) Cleanup(container *container.Container) {
daemon.releaseNetwork(container)
if err := container.UnmountIpcMount(detachMounted); err != nil {
logrus.Warnf("%s cleanup: failed to unmount IPC: %s", container.ID, err)
}
if err := daemon.conditionalUnmountOnCleanup(container); err != nil {
// FIXME: remove once reference counting for graphdrivers has been refactored
// Ensure that all the mounts are gone
if mountid, err := daemon.stores[container.OS].layerStore.GetMountID(container.ID); err == nil {
daemon.cleanupMountsByID(mountid)
}
}
if err := container.UnmountSecrets(); err != nil {
logrus.Warnf("%s cleanup: failed to unmount secrets: %s", container.ID, err)
}
for _, eConfig := range container.ExecCommands.Commands() {
daemon.unregisterExecCommand(container, eConfig)
}
if container.BaseFS != nil && container.BaseFS.Path() != "" {
if err := container.UnmountVolumes(daemon.LogVolumeEvent); err != nil {
logrus.Warnf("%s cleanup: Failed to umount volumes: %v", container.ID, err)
}
}
container.CancelAttachContext()
if err := daemon.containerd.Delete(context.Background(), container.ID); err != nil {
logrus.Errorf("%s cleanup: failed to delete container from containerd: %v", container.ID, err)
}
}