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在本教程的前一个步骤中,您缩放了服务实例的数量。在本教程的这一部分中,您将部署基于 Redis 3.0.6容器映像的服务。然后,您使用滚动更新升级服务以使用 Redis 3.0.7容器映像。

1. 如果您还没有,请打开一个终端并将 ssh 放入运行管理器节点的机器中。例如,本教程使用名为manager1的计算机。

2. 将 Redis 3.0.6部署到群集,并配置10秒更新延迟的群集:

$ docker service create \   --replicas 3 \   --name redis \   --update-delay 10s \   redis:3.0.6  0u6a4s31ybk7yw2wyvtikmu50

您可以在服务部署时配置滚动更新策略。

--update-delay标志配置更新服务任务或多组任务之间的时间延迟。您可以将时间描述T为秒数Ts,分钟数Tm或小时数的组合Th。因此10m30s表示延迟10分30秒。

默认情况下,调度程序一次更新1个任务。您可以通过此--update-parallelism标志来配置调度程序同时更新的最大服务任务数。

默认情况下,当对单个任务的更新返回RUNNING状态时,调度程序调度另一个任务以更新,直到所有任务都更新。如果在任务更新期间的任何时间返回FAILED,调度程序会暂停更新。您可以使用--update-failure-action标志来控制docker service createdocker service update行为。

1. 检查redis服务:

$ docker service inspect --pretty redis  ID:             0u6a4s31ybk7yw2wyvtikmu50 Name:           redis Service Mode:   Replicated  Replicas:      3 Placement:  Strategy:    Spread UpdateConfig:  Parallelism:   1  Delay:         10s ContainerSpec:  Image:         redis:3.0.6 Resources: Endpoint Mode:  vip

2. 现在您可以更新redis容器图像了。swarm manager 根据UpdateConfig策略将更新应用于节点:

$ docker 服务更新--image redis:3.0.7 redis redis

调度程序默认应用滚动更新,如下所示:

- Stop the first task.- Schedule update for the stopped task.- Start the container for the updated task.- If the update to a task returns `RUNNING`, wait for the specified delay period then start the next task.- If, at any time during the update, a task returns `FAILED`, pause the update.

1. 运行docker service inspect --pretty redis,看看在期望的状态的新的图像:$ docker service inspect --pretty redis  ID:             0u6a4s31ybk7yw2wyvtikmu50 Name:           redis Service Mode:   Replicated  Replicas:      3 Placement:  Strategy:    Spread UpdateConfig:  Parallelism:   1  Delay:         10s ContainerSpec:  Image:         redis:3.0.7 Resources: Endpoint Mode:  vip

显示您的更新是否因失败而暂停的service inspect输出:$ docker service inspect --pretty redis  ID:             0u6a4s31ybk7yw2wyvtikmu50 Name:           redis ...snip... Update status:  State:      paused  Started:    11 seconds ago  Message:    update paused due to failure or early termination of task 9p7ith557h8ndf0ui9s0q951b ...snip...

重新启动暂停的更新运行docker service update <SERVICE-ID>。例如:docker服务更新 redis 为避免重复某些更新失败,您可能需要通过传递标志到docker service update来重新配置服务。

2. 运行docker service ps <SERVICE-ID>以观看滚动更新:

$ docker service ps redis  NAME                                   IMAGE        NODE       DESIRED STATE  CURRENT STATE            ERROR redis.1.dos1zffgeofhagnve8w864fco      redis:3.0.7  worker1    Running        Running 37 seconds  \ redis.1.88rdo6pa52ki8oqx6dogf04fh  redis:3.0.6  worker2    Shutdown       Shutdown 56 seconds ago redis.2.9l3i4j85517skba5o7tn5m8g0      redis:3.0.7  worker2    Running        Running About a minute  \ redis.2.66k185wilg8ele7ntu8f6nj6i  redis:3.0.6  worker1    Shutdown       Shutdown 2 minutes ago redis.3.egiuiqpzrdbxks3wxgn8qib1g      redis:3.0.7  worker1    Running        Running 48 seconds  \_ redis.3.ctzktfddb2tepkr45qcmqln04  redis:3.0.6  mmanager1  Shutdown       Shutdown 2 minutes ago

在 Swarm 更新所有任务之前,您可以看到有些正在运行redis:3.0.6而另一些正在运行redis:3.0.7。上面的输出显示滚动更新完成后的状态。

接下来是什么?

接下来,了解如何排除群中的节点。

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