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在本教程的前幾個步驟中，所有節(jié)點都在ACTIVE可用狀態(tài)下運行。swarm manager可以將任務分配給任何ACTIVE節(jié)點，所以到現(xiàn)在為止所有節(jié)點都可以接收任務。

有時，例如計劃的維護時間，您需要將節(jié)點設置為DRAIN可用性。DRAIN可用性阻止節(jié)點從群管理器接收新任務。這也意味著管理器停止在節(jié)點上運行的任務，并在具有ACTIVE可用性的節(jié)點上啟動副本任務。

  1. 如果您還沒有，請打開終端并將ssh放入運行管理器節(jié)點的機器中。例如，本教程使用名為的計算機manager1。

  2. 確認您的所有節(jié)點都可用。$ docker節(jié)點ls ID 主機名狀態(tài)可用性管理器狀態(tài)1bcef6utixb0l0ca7gxuivsj0 worker2準備好活動38ciaotwjuritcdtn9npbnkuz worker1準備好活動e216jshn25ckzbvmwlnh5jr3g * manager1準備好主動領導者

  3. 如果您還沒有運行redis滾動更新教程中的服務，請立即啟動它：$ docker service create --replicas 3 --name redis --update-delay 10s redis：3.0.6 c5uo6kdmzpon37mgj9mwglcfw

  4. 運行docker service ps redis以查看swarm manager如何將任務分配給不同節(jié)點：$ docker service ps redis名稱映像節(jié)點期望狀態(tài)當前狀態(tài)redis.1.7q92v0nr1hcgts2amcjyqg3pq redis：3.0.6 manager1運行運行26秒redis.2.7h2l8h3q3wqy5f66hlv9ddmi6 redis：3.0.6 worker1運行運行26秒redis.3.9bg7cezvedmkgg6c8yzvbhwsd redis：3.0.6 worker2運行運行26秒在這種情況下，swarm管理器向每個節(jié)點分配一個任務。您可能會看到環(huán)境中的節(jié)點之間的任務分布不同。

  5. 運行docker node update --availability drain <NODE-ID>以排除已分配任務的節(jié)點：docker節(jié)點更新 - 可用性drain worker1 worker1

  6. 檢查點，檢查其可用性：$搬運工節(jié)點檢查--pretty worker1 ID：38ciaotwjuritcdtn9npbnkuz主機名：worker1狀態(tài)：狀態(tài)：隨時可用：漏...略...瀝干節(jié)點顯示Drain了AVAILABILITY。

  7. 運行docker service ps redis以查看swarm管理器如何更新服務的任務分配redis：$ docker service ps redis NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR redis.1.7q92v0nr1hcgts2amcjyqg3pq redis：3.0.6 manager1 Running Running Running 4分鐘redis.2.b4hovzed7id8irg1to42egue8 redis：3.0 .6 worker2正在運行運行大約一分鐘\ _ redis.2.7h2l8h3q3wqy5f66hlv9ddmi6 redis：3.0.6 worker1關機關機2分鐘前redis.3.9bg7cezvedmkgg6c8yzvbhwsd redis：3.0.6 worker2正在運行運行4分鐘swarm管理器通過結(jié)束任務來維護所需的狀態(tài)在具有Drain可用性的節(jié)點上創(chuàng)建具有可用性的節(jié)點上的新任務Active。

  8. 運行docker node update --availability active <NODE-ID>以將已耗盡的節(jié)點返回到活動狀態(tài)：$ docker node update --availability active worker1 worker1

  9. 檢查節(jié)點以查看更新的狀態(tài)：$ docker節(jié)點檢查--pretty worker1 ID：38ciaotwjuritcdtn9npbnkuz主機名：worker1狀態(tài)：狀態(tài)：就緒可用性：活動... snip ...當您將節(jié)點設置回Active可用性時，它可以接收新任務：

- during a service update to scale up- during a rolling update- when you set another node to `Drain` availability- when a task fails on another active node

下一步是什么？

了解如何使用群模式路由網(wǎng)格。

教程，集群管理，群集，服務，流失（tutorial, cluster management, swarm, service, drain）

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