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package daemon // import "github.com/docker/docker/daemon"
import (
"context"
"time"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/container"
"github.com/docker/docker/errdefs"
"github.com/moby/sys/signal"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// ContainerStop looks for the given container and stops it.
// In case the container fails to stop gracefully within a time duration
// specified by the timeout argument, in seconds, it is forcefully
// terminated (killed).
//
// If the timeout is nil, the container's StopTimeout value is used, if set,
// otherwise the engine default. A negative timeout value can be specified,
// meaning no timeout, i.e. no forceful termination is performed.
func (daemon *Daemon) ContainerStop(ctx context.Context, name string, options containertypes.StopOptions) error {
ctr, err := daemon.GetContainer(name)
if err != nil {
return err
}
if !ctr.IsRunning() {
return containerNotModifiedError{}
}
err = daemon.containerStop(ctx, ctr, options)
if err != nil {
return errdefs.System(errors.Wrapf(err, "cannot stop container: %s", name))
}
return nil
}
// containerStop sends a stop signal, waits, sends a kill signal.
func (daemon *Daemon) containerStop(ctx context.Context, ctr *container.Container, options containertypes.StopOptions) (retErr error) {
if !ctr.IsRunning() {
return nil
}
var (
stopSignal = ctr.StopSignal()
stopTimeout = ctr.StopTimeout()
)
if options.Signal != "" {
sig, err := signal.ParseSignal(options.Signal)
if err != nil {
return errdefs.InvalidParameter(err)
}
stopSignal = sig
}
if options.Timeout != nil {
stopTimeout = *options.Timeout
}
var wait time.Duration
if stopTimeout >= 0 {
wait = time.Duration(stopTimeout) * time.Second
}
defer func() {
if retErr == nil {
daemon.LogContainerEvent(ctr, "stop")
}
}()
// 1. Send a stop signal
err := daemon.killPossiblyDeadProcess(ctr, stopSignal)
if err != nil {
wait = 2 * time.Second
}
var subCtx context.Context
var cancel context.CancelFunc
if stopTimeout >= 0 {
subCtx, cancel = context.WithTimeout(ctx, wait)
} else {
subCtx, cancel = context.WithCancel(ctx)
}
defer cancel()
if status := <-ctr.Wait(subCtx, container.WaitConditionNotRunning); status.Err() == nil {
// container did exit, so ignore any previous errors and return
return nil
}
if err != nil {
// the container has still not exited, and the kill function errored, so log the error here:
logrus.WithError(err).WithField("container", ctr.ID).Errorf("Error sending stop (signal %d) to container", stopSignal)
}
if stopTimeout < 0 {
// if the client requested that we never kill / wait forever, but container.Wait was still
// interrupted (parent context cancelled, for example), we should propagate the signal failure
return err
}
logrus.WithField("container", ctr.ID).Infof("Container failed to exit within %s of signal %d - using the force", wait, stopSignal)
// Stop either failed or container didn't exit, so fallback to kill.
if err := daemon.Kill(ctr); err != nil {
// got a kill error, but give container 2 more seconds to exit just in case
subCtx, cancel := context.WithTimeout(ctx, 2*time.Second)
defer cancel()
status := <-ctr.Wait(subCtx, container.WaitConditionNotRunning)
if status.Err() != nil {
logrus.WithError(err).WithField("container", ctr.ID).Errorf("error killing container: %v", status.Err())
return err
}
// container did exit, so ignore previous errors and continue
}
return nil
}
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