package daemon import ( "fmt" "runtime" "github.com/docker/docker/runconfig" ) // ContainerStart starts a container. func (daemon *Daemon) ContainerStart(name string, hostConfig *runconfig.HostConfig) error { container, err := daemon.Get(name) if err != nil { return err } if container.isPaused() { return fmt.Errorf("Cannot start a paused container, try unpause instead.") } if container.IsRunning() { return fmt.Errorf("Container already started") } // 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 { if err := daemon.setHostConfig(container, hostConfig); err != nil { return err } } } else { if hostConfig != nil { return fmt.Errorf("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.hostConfig, nil); err != nil { return err } if err := container.Start(); err != nil { return fmt.Errorf("Cannot start container %s: %s", name, err) } return nil }