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package daemon // import "github.com/docker/docker/daemon"
import (
"context"
"fmt"
"github.com/docker/docker/container"
"github.com/sirupsen/logrus"
)
// ContainerPause pauses a container
func (daemon *Daemon) ContainerPause(name string) error {
ctr, err := daemon.GetContainer(name)
if err != nil {
return err
}
return daemon.containerPause(ctr)
}
// containerPause pauses the container execution without stopping the process.
// The execution can be resumed by calling containerUnpause.
func (daemon *Daemon) containerPause(container *container.Container) error {
container.Lock()
defer container.Unlock()
// We cannot Pause the container which is not running
tsk, err := container.GetRunningTask()
if err != nil {
return err
}
// We cannot Pause the container which is already paused
if container.Paused {
return errNotPaused(container.ID)
}
// We cannot Pause the container which is restarting
if container.Restarting {
return errContainerIsRestarting(container.ID)
}
if err := tsk.Pause(context.Background()); err != nil {
return fmt.Errorf("cannot pause container %s: %s", container.ID, err)
}
container.Paused = true
daemon.setStateCounter(container)
daemon.updateHealthMonitor(container)
daemon.LogContainerEvent(container, "pause")
if err := container.CheckpointTo(daemon.containersReplica); err != nil {
logrus.WithError(err).Warn("could not save container to disk")
}
return nil
}
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