// containerStart prepares the container to run by setting up everything the
// container needs, such as storage and networking, as well as links
// between containers. The container is left waiting for a signal to
// begin running.
func (daemon *Daemon) containerStart(container *container.Container, checkpoint string, resetRestartManager bool) (err error) {
container.Lock()
defer container.Unlock()
if resetRestartManager && container.Running { // skip this check if already in restarting step and resetRestartManager==false
return nil
}
if container.RemovalInProgress || container.Dead {
return fmt.Errorf("Container is marked for removal and cannot be started.")
}
// if we encounter an error during start we need to ensure that any other
// setup has been cleaned up properly
defer func() {
if err != nil {
container.SetError(err)
// if no one else has set it, make sure we don't leave it at zero
if container.ExitCode() == 0 {
container.SetExitCode(128)
}
container.ToDisk()
daemon.Cleanup(container)
// if containers AutoRemove flag is set, remove it after clean up
if container.HostConfig.AutoRemove {
container.Unlock()
if err := daemon.ContainerRm(container.ID, &types.ContainerRmConfig{ForceRemove: true, RemoveVolume: true}); err != nil {
logrus.Errorf("can't remove container %s: %v", container.ID, err)
}
container.Lock()
}
}
}()
if err := daemon.conditionalMountOnStart(container); err != nil {
return err
}
// Make sure NetworkMode has an acceptable value. We do this to ensure
// backwards API compatibility.
container.HostConfig = runconfig.SetDefaultNetModeIfBlank(container.HostConfig)
if err := daemon.initializeNetworking(container); err != nil {
return err
}
spec, err := daemon.createSpec(container)
if err != nil {
return err
}
createOptions, err := daemon.getLibcontainerdCreateOptions(container)
if err != nil {
return err
}
if resetRestartManager {
container.ResetRestartManager(true)
}
if err := daemon.containerd.Create(container.ID, checkpoint, container.CheckpointDir(), *spec, container.InitializeStdio, createOptions...); err != nil {
errDesc := grpc.ErrorDesc(err)
logrus.Errorf("Create container failed with error: %s", errDesc)
// if we receive an internal error from the initial start of a container then lets
// return it instead of entering the restart loop
// set to 127 for container cmd not found/does not exist)
if strings.Contains(errDesc, container.Path) &&
(strings.Contains(errDesc, "executable file not found") ||
strings.Contains(errDesc, "no such file or directory") ||
strings.Contains(errDesc, "system cannot find the file specified")) {
container.SetExitCode(127)
}
// set to 126 for container cmd can't be invoked errors
if strings.Contains(errDesc, syscall.EACCES.Error()) {
container.SetExitCode(126)
}
// attempted to mount a file onto a directory, or a directory onto a file, maybe from user specified bind mounts
if strings.Contains(errDesc, syscall.ENOTDIR.Error()) {
errDesc += ": Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type"
container.SetExitCode(127)
}
container.Reset(false)
return fmt.Errorf("%s", errDesc)
}
return nil
}
