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
}
if container.RemovalInProgress || container.Dead {
return fmt.Errorf("Container is marked for removal and cannot be \"update\".")
}
if container.IsRunning() && hostConfig.KernelMemory != 0 {
return fmt.Errorf("Can not update kernel memory to a running container, please stop it first.")
}
if err := container.UpdateContainer(hostConfig); err != nil {
return err
}
// 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() {
if err := daemon.execDriver.Update(container.Command); err != nil {
return err
}
}
return 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.ToDisk()
container.Unlock()
}
}()
if container.RemovalInProgress || container.Dead {
return errCannotUpdate(container.ID, fmt.Errorf("Container is marked for removal and cannot be \"update\"."))
}
if err := container.UpdateContainer(hostConfig); err != nil {
restoreConfig = true
return errCannotUpdate(container.ID, err)
}
// 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(container.ID, toContainerdResources(hostConfig.Resources)); err != nil {
restoreConfig = true
return errCannotUpdate(container.ID, err)
}
}
daemon.LogContainerEvent(container, "update")
return nil
}