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テキスト

在本教程的前一個(gè)步驟中，您縮放了服務(wù)實(shí)例的數(shù)量。在本教程的這一部分中，您將部署基于 Redis 3.0.6容器映像的服務(wù)。然后，您使用滾動(dòng)更新升級(jí)服務(wù)以使用 Redis 3.0.7容器映像。

1. 如果您還沒有，請(qǐng)打開一個(gè)終端并將 ssh 放入運(yùn)行管理器節(jié)點(diǎn)的機(jī)器中。例如，本教程使用名為manager1的計(jì)算機(jī)。

2. 將 Redis 3.0.6部署到群集，并配置10秒更新延遲的群集：

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

您可以在服務(wù)部署時(shí)配置滾動(dòng)更新策略。

--update-delay標(biāo)志配置更新服務(wù)任務(wù)或多組任務(wù)之間的時(shí)間延遲。您可以將時(shí)間描述T為秒數(shù)Ts，分鐘數(shù)Tm或小時(shí)數(shù)的組合Th。因此10m30s表示延遲10分30秒。

默認(rèn)情況下，調(diào)度程序一次更新1個(gè)任務(wù)。您可以通過此--update-parallelism標(biāo)志來(lái)配置調(diào)度程序同時(shí)更新的最大服務(wù)任務(wù)數(shù)。

默認(rèn)情況下，當(dāng)對(duì)單個(gè)任務(wù)的更新返回RUNNING狀態(tài)時(shí)，調(diào)度程序調(diào)度另一個(gè)任務(wù)以更新，直到所有任務(wù)都更新。如果在任務(wù)更新期間的任何時(shí)間返回FAILED，調(diào)度程序會(huì)暫停更新。您可以使用--update-failure-action標(biāo)志來(lái)控制docker service create或docker service update行為。

1. 檢查redis服務(wù)：

$ 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. 現(xiàn)在您可以更新redis容器圖像了。swarm manager 根據(jù)UpdateConfig策略將更新應(yīng)用于節(jié)點(diǎn)：

$ docker 服務(wù)更新--image redis：3.0.7 redis redis

調(diào)度程序默認(rèn)應(yīng)用滾動(dòng)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. 運(yùn)行docker service inspect --pretty redis，看看在期望的狀態(tài)的新的圖像：$ 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

顯示您的更新是否因失敗而暫停的service inspect輸出：$ 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...

重新啟動(dòng)暫停的更新運(yùn)行docker service update <SERVICE-ID>。例如：docker服務(wù)更新 redis 為避免重復(fù)某些更新失敗，您可能需要通過傳遞標(biāo)志到docker service update來(lái)重新配置服務(wù)。

2. 運(yùn)行docker service ps <SERVICE-ID>以觀看滾動(dòng)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 更新所有任務(wù)之前，您可以看到有些正在運(yùn)行redis:3.0.6而另一些正在運(yùn)行redis:3.0.7。上面的輸出顯示滾動(dòng)更新完成后的狀態(tài)。

接下來(lái)是什么？

接下來(lái)，了解如何排除群中的節(jié)點(diǎn)。

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