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1. As daemon.ContainerStop() documentation says, > If a negative number of seconds is given, ContainerStop > will wait for a graceful termination. but since commitcfdf84d5d0(PR #32237) this is no longer the case. This happens because `context.WithTimeout(ctx, timeout)` is implemented as `WithDeadline(ctx, time.Now().Add(timeout))`, resulting in a deadline which is in the past. To fix, don't use WithDeadline() if the timeout is negative. 2. Add a test case to validate the correct behavior and as a means to prevent a similar regression in the future. 3. Fix/improve daemon.ContainerStop() and client.ContainerStop() description for clarity and completeness. 4. Fix/improve DefaultStopTimeout description. Fixes:cfdf84d5d0("Update Container Wait") Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
89 lines
3.3 KiB
Go
89 lines
3.3 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 stops it.
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// In case the container fails to stop gracefully within a time duration
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// specified by the timeout argument, in seconds, it is forcefully
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// terminated (killed).
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//
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// If the timeout is nil, the container's StopTimeout value is used, if set,
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// otherwise the engine default. A negative timeout value can be specified,
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// meaning no timeout, i.e. no forceful termination is performed.
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func (daemon *Daemon) ContainerStop(name string, timeout *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 timeout == nil {
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stopTimeout := container.StopTimeout()
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timeout = &stopTimeout
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}
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if err := daemon.containerStop(container, *timeout); 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 sends a stop signal, waits, sends a kill signal.
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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 := context.Background()
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if seconds >= 0 {
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var cancel context.CancelFunc
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ctx, cancel = context.WithTimeout(ctx, time.Duration(seconds)*time.Second)
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defer cancel()
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}
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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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