github.com/wozhu6104/docker@v20.10.10+incompatible/daemon/pause.go (about) 1 package daemon // import "github.com/docker/docker/daemon" 2 3 import ( 4 "context" 5 "fmt" 6 7 "github.com/docker/docker/container" 8 "github.com/sirupsen/logrus" 9 ) 10 11 // ContainerPause pauses a container 12 func (daemon *Daemon) ContainerPause(name string) error { 13 ctr, err := daemon.GetContainer(name) 14 if err != nil { 15 return err 16 } 17 return daemon.containerPause(ctr) 18 } 19 20 // containerPause pauses the container execution without stopping the process. 21 // The execution can be resumed by calling containerUnpause. 22 func (daemon *Daemon) containerPause(container *container.Container) error { 23 container.Lock() 24 defer container.Unlock() 25 26 // We cannot Pause the container which is not running 27 if !container.Running { 28 return errNotRunning(container.ID) 29 } 30 31 // We cannot Pause the container which is already paused 32 if container.Paused { 33 return errNotPaused(container.ID) 34 } 35 36 // We cannot Pause the container which is restarting 37 if container.Restarting { 38 return errContainerIsRestarting(container.ID) 39 } 40 41 if err := daemon.containerd.Pause(context.Background(), container.ID); err != nil { 42 return fmt.Errorf("Cannot pause container %s: %s", container.ID, err) 43 } 44 45 container.Paused = true 46 daemon.setStateCounter(container) 47 daemon.updateHealthMonitor(container) 48 daemon.LogContainerEvent(container, "pause") 49 50 if err := container.CheckpointTo(daemon.containersReplica); err != nil { 51 logrus.WithError(err).Warn("could not save container to disk") 52 } 53 54 return nil 55 }