### Action required

  * Docker v1.9.1 is officially recommended. Docker v1.8.3 and Docker v1.10 are
supported. If you are using an older release of Docker, please upgrade. Known
issues with Docker 1.9.1 can be found below.
  * CPU hardcapping will be enabled by default for containers with CPU limit set,

Vous pouvez en lire davantage dans la [documentation Docker sur les formes shell et exec](https://docs.docker.com/reference/dockerfile/#shell-and-exec-form).

	}
	return lockCopy
}

func (l *localLocker) Close() error {
	return nil
}

// IsOnline - local locker is always online.
func (l *localLocker) IsOnline() bool {
	return true
}

// IsLocal - local locker returns true.
func (l *localLocker) IsLocal() bool {
	return true
}

Подробнее об этом читайте в [документации Docker о shell- и exec-формах](https://docs.docker.com/reference/dockerfile/#shell-and-exec-form).

Это особенно заметно при использовании `docker compose`. См. раздел FAQ Docker Compose с техническими подробностями: [Почему мои сервисы пересоздаются или останавливаются 10 секунд?](https://docs.docker.com/compose/faq/#why-do-my-services-take-10-seconds-to-recreate-or-stop).

You can read more about it in the [Docker docs for shell and exec form](https://docs.docker.com/reference/dockerfile/#shell-and-exec-form).

This can be quite noticeable when using `docker compose`. See this Docker Compose FAQ section for more technical details: [Why do my services take 10 seconds to recreate or stop?](https://docs.docker.com/compose/faq/#why-do-my-services-take-10-seconds-to-recreate-or-stop).

## 容器镜像 { #container-images }

Docker 一直是创建和管理**容器镜像**与**容器**的主要工具之一。

还有一个公共的 [Docker Hub](https://hub.docker.com/)，其中为许多工具、环境、数据库和应用提供了预制的**官方容器镜像**。

例如，有官方的 [Python 镜像](https://hub.docker.com/_/python)。

还有许多用于不同目的（如数据库）的镜像，例如：

* [PostgreSQL](https://hub.docker.com/_/postgres)
* [MySQL](https://hub.docker.com/_/mysql)
* [MongoDB](https://hub.docker.com/_/mongo)
* [Redis](https://hub.docker.com/_/redis) 等。

			g := Granted{index: index}
			if c == nil {
				log("dsync: nil locker\n")
				ch <- g
				return
			}

			var locked bool
			var err error
			if isReadLock {
				if locked, err = c.RLock(netLockCtx, args); err != nil {
					log("dsync: Unable to call RLock failed with %s for %#v at %s\n", err, args, c)
				}
			} else {
				if locked, err = c.Lock(netLockCtx, args); err != nil {

			go func(i int, endpoint Endpoint) {
				defer wg.Done()

				lk.Lock()
				// Only add lockers only one per endpoint and per erasure set.
				if locker, ok := erasureLockers[endpoint.Host]; ok && !lockerEpSet.Contains(endpoint.Host) {
					lockerEpSet.Add(endpoint.Host)
					s.erasureLockers[i] = append(s.erasureLockers[i], locker)
				}
				lk.Unlock()
			}(i, endpoints.Endpoints[i*setDriveCount+j])
		}
	}
	wg.Wait()

    //            (__)\       )\/\
    //                ||----w |
    //                ||     ||
    Runnable state = get();
    Blocker blocker = null;
    while (state instanceof Blocker || state == PARKED) {
      if (state instanceof Blocker) {
        blocker = (Blocker) state;
      }
      spinCount++;
      if (spinCount > MAX_BUSY_WAIT_SPINS) {
        /*

Detaylar için [shell ve exec form için Docker dokümanlarına](https://docs.docker.com/reference/dockerfile/#shell-and-exec-form) bakabilirsiniz.

Bu durum `docker compose` kullanırken oldukça belirgin olabilir. Daha teknik detaylar için şu Docker Compose FAQ bölümüne bakın: [Hizmetlerimin yeniden oluşturulması veya durması neden 10 saniye sürüyor?](https://docs.docker.com/compose/faq/#why-do-my-services-take-10-seconds-to-recreate-or-stop).