package daemon import ( "context" "fmt" "github.com/docker/docker/api/types/container" "github.com/pkg/errors" ) // ContainerUpdate updates configuration of the container func (daemon *Daemon) ContainerUpdate(name string, hostConfig *container.HostConfig) (container.ContainerUpdateOKBody, error) { var warnings []string c, err := daemon.GetContainer(name) if err != nil { return container.ContainerUpdateOKBody{Warnings: warnings}, err } warnings, err = daemon.verifyContainerSettings(c.OS, hostConfig, nil, true) if err != nil { return container.ContainerUpdateOKBody{Warnings: warnings}, validationError{err} } if err := daemon.update(name, hostConfig); err != nil { return container.ContainerUpdateOKBody{Warnings: warnings}, err } return container.ContainerUpdateOKBody{Warnings: warnings}, nil } func (daemon *Daemon) update(name string, hostConfig *container.HostConfig) error { if hostConfig == nil { return nil } container, err := daemon.GetContainer(name) if err != nil { return err } restoreConfig := false backupHostConfig := *container.HostConfig defer func() { if restoreConfig { container.Lock() container.HostConfig = &backupHostConfig container.CheckpointTo(daemon.containersReplica) container.Unlock() } }() if container.RemovalInProgress || container.Dead { return errCannotUpdate(container.ID, fmt.Errorf("container is marked for removal and cannot be \"update\"")) } container.Lock() if err := container.UpdateContainer(hostConfig); err != nil { restoreConfig = true container.Unlock() return errCannotUpdate(container.ID, err) } if err := container.CheckpointTo(daemon.containersReplica); err != nil { restoreConfig = true container.Unlock() return errCannotUpdate(container.ID, err) } container.Unlock() // if Restart Policy changed, we need to update container monitor if hostConfig.RestartPolicy.Name != "" { container.UpdateMonitor(hostConfig.RestartPolicy) } // If container is not running, update hostConfig struct is enough, // resources will be updated when the container is started again. // If container is running (including paused), we need to update configs // to the real world. if container.IsRunning() && !container.IsRestarting() { if err := daemon.containerd.UpdateResources(context.Background(), container.ID, toContainerdResources(hostConfig.Resources)); err != nil { restoreConfig = true // TODO: it would be nice if containerd responded with better errors here so we can classify this better. return errCannotUpdate(container.ID, systemError{err}) } } daemon.LogContainerEvent(container, "update") return nil } func errCannotUpdate(containerID string, err error) error { return errors.Wrap(err, "Cannot update container "+containerID) }