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87 lines
3.4 KiB
Go
87 lines
3.4 KiB
Go
package daemon // import "github.com/docker/docker/daemon"
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import (
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"context"
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"time"
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containerpkg "github.com/docker/docker/container"
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"github.com/docker/docker/errdefs"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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// ContainerStop looks for the given container and terminates it,
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// waiting the given number of seconds before forcefully killing the
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// container. If a negative number of seconds is given, ContainerStop
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// will wait for a graceful termination. An error is returned if the
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// container is not found, is already stopped, or if there is a
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// problem stopping the container.
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func (daemon *Daemon) ContainerStop(name string, seconds *int) error {
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container, err := daemon.GetContainer(name)
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if err != nil {
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return err
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}
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if !container.IsRunning() {
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return containerNotModifiedError{running: false}
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}
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if seconds == nil {
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stopTimeout := container.StopTimeout()
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seconds = &stopTimeout
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}
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if err := daemon.containerStop(container, *seconds); err != nil {
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return errdefs.System(errors.Wrapf(err, "cannot stop container: %s", name))
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}
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return nil
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}
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// containerStop halts a container by sending a stop signal, waiting for the given
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// duration in seconds, and then calling SIGKILL and waiting for the
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// process to exit. If a negative duration is given, Stop will wait
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// for the initial signal forever. If the container is not running Stop returns
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// immediately.
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func (daemon *Daemon) containerStop(container *containerpkg.Container, seconds int) error {
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if !container.IsRunning() {
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return nil
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}
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stopSignal := container.StopSignal()
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// 1. Send a stop signal
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if err := daemon.killPossiblyDeadProcess(container, stopSignal); err != nil {
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// While normally we might "return err" here we're not going to
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// because if we can't stop the container by this point then
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// it's probably because it's already stopped. Meaning, between
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// the time of the IsRunning() call above and now it stopped.
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// Also, since the err return will be environment specific we can't
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// look for any particular (common) error that would indicate
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// that the process is already dead vs something else going wrong.
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// So, instead we'll give it up to 2 more seconds to complete and if
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// by that time the container is still running, then the error
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// we got is probably valid and so we force kill it.
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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if status := <-container.Wait(ctx, containerpkg.WaitConditionNotRunning); status.Err() != nil {
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logrus.Infof("Container failed to stop after sending signal %d to the process, force killing", stopSignal)
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if err := daemon.killPossiblyDeadProcess(container, 9); err != nil {
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return err
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}
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}
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}
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// 2. Wait for the process to exit on its own
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ctx, cancel := context.WithTimeout(context.Background(), time.Duration(seconds)*time.Second)
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defer cancel()
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if status := <-container.Wait(ctx, containerpkg.WaitConditionNotRunning); status.Err() != nil {
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logrus.Infof("Container %v failed to exit within %d seconds of signal %d - using the force", container.ID, seconds, stopSignal)
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// 3. If it doesn't, then send SIGKILL
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if err := daemon.Kill(container); err != nil {
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// Wait without a timeout, ignore result.
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<-container.Wait(context.Background(), containerpkg.WaitConditionNotRunning)
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logrus.Warn(err) // Don't return error because we only care that container is stopped, not what function stopped it
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}
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}
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daemon.LogContainerEvent(container, "stop")
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return nil
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}
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