| package daemon // import "github.com/docker/docker/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/docker/docker/errdefs" |
| "github.com/docker/docker/pkg/mount" |
| "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 errdefs.InvalidParameter(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 errdefs.Conflict(errors.New("cannot start a paused container, try unpause instead")) |
| } |
| |
| if container.Running { |
| return containerNotModifiedError{running: true} |
| } |
| |
| if container.RemovalInProgress || container.Dead { |
| return errdefs.Conflict(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 errdefs.InvalidParameter(err) |
| } |
| if err := daemon.mergeAndVerifyLogConfig(&hostConfig.LogConfig); err != nil { |
| return errdefs.InvalidParameter(err) |
| } |
| if err := daemon.setHostConfig(container, hostConfig); err != nil { |
| return errdefs.InvalidParameter(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 |
| if err := container.CheckpointTo(daemon.containersReplica); err != nil { |
| return errdefs.System(err) |
| } |
| } |
| container.InitDNSHostConfig() |
| } |
| } else { |
| if hostConfig != nil { |
| return errdefs.InvalidParameter(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 errdefs.InvalidParameter(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 errdefs.InvalidParameter(err) |
| } |
| } |
| return daemon.containerStart(container, checkpoint, checkpointDir, true) |
| } |
| |
| // 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 errdefs.Conflict(errors.New("container is marked for removal and cannot be started")) |
| } |
| |
| if checkpointDir != "" { |
| // TODO(mlaventure): how would we support that? |
| return errdefs.Forbidden(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 errdefs.System(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 |
| } |
| |
| ctx := context.TODO() |
| |
| err = daemon.containerd.Create(ctx, container.ID, spec, createOptions) |
| if err != nil { |
| if errdefs.IsConflict(err) { |
| logrus.WithError(err).WithField("container", container.ID).Error("Container not cleaned up from containerd from previous run") |
| // best effort to clean up old container object |
| daemon.containerd.DeleteTask(ctx, container.ID) |
| if err := daemon.containerd.Delete(ctx, container.ID); err != nil && !errdefs.IsNotFound(err) { |
| logrus.WithError(err).WithField("container", container.ID).Error("Error cleaning up stale containerd container object") |
| } |
| err = daemon.containerd.Create(ctx, 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(); 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.imageService.GetLayerMountID(container.ID, container.OS); err == nil { |
| daemon.cleanupMountsByID(mountid) |
| } |
| } |
| |
| if err := container.UnmountSecrets(); err != nil { |
| logrus.Warnf("%s cleanup: failed to unmount secrets: %s", container.ID, err) |
| } |
| |
| if err := mount.RecursiveUnmount(container.Root); err != nil { |
| logrus.WithError(err).WithField("container", container.ID).Warn("Error while cleaning up container resource mounts.") |
| } |
| |
| 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) |
| } |
| } |
