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moby--moby/daemon/restart.go
zhouhao 870cf1096f Optimize the restart function code
Signed-off-by: zhouhao <zhouhao@cn.fujitsu.com>
2016-08-26 14:22:39 +08:00

65 lines
2.1 KiB
Go

package daemon
import (
"fmt"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/container"
)
// ContainerRestart stops and starts a container. It attempts to
// gracefully stop the container within the given timeout, forcefully
// stopping it if the timeout is exceeded. If given a negative
// timeout, ContainerRestart will wait forever until a graceful
// stop. Returns an error if the container cannot be found, or if
// there is an underlying error at any stage of the restart.
func (daemon *Daemon) ContainerRestart(name string, seconds int) error {
container, err := daemon.GetContainer(name)
if err != nil {
return err
}
if err := daemon.containerRestart(container, seconds); err != nil {
return fmt.Errorf("Cannot restart container %s: %v", name, err)
}
return nil
}
// containerRestart attempts to gracefully stop and then start the
// container. When stopping, wait for the given duration in seconds to
// gracefully stop, before forcefully terminating the container. If
// given a negative duration, wait forever for a graceful stop.
func (daemon *Daemon) containerRestart(container *container.Container, seconds int) error {
// Avoid unnecessarily unmounting and then directly mounting
// the container when the container stops and then starts
// again
if err := daemon.Mount(container); err == nil {
defer daemon.Unmount(container)
}
if container.IsRunning() {
// set AutoRemove flag to false before stop so the container won't be
// removed during restart process
autoRemove := container.HostConfig.AutoRemove
container.HostConfig.AutoRemove = false
err := daemon.containerStop(container, seconds)
// restore AutoRemove irrespective of whether the stop worked or not
container.HostConfig.AutoRemove = autoRemove
// containerStop will write HostConfig to disk, we shall restore AutoRemove
// in disk too
if toDiskErr := container.ToDiskLocking(); toDiskErr != nil {
logrus.Errorf("Write container to disk error: %v", toDiskErr)
}
if err != nil {
return err
}
}
if err := daemon.containerStart(container); err != nil {
return err
}
daemon.LogContainerEvent(container, "restart")
return nil
}