Compose
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Engine
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apt-cacher-ng
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Engine: Security
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Engine: Tutorials
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Get Started
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Notary
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このドキュメントでは、 php中國語ネットマニュアル リリース
テキスト
Docker Engine 1.12 引入了群模式，使您能夠創(chuàng)建一個或多個名為群集的碼頭引擎集群。群集由一個或多個節(jié)點組成：以群集模式運行 DockerEngine 1.12 或更高版本的物理或虛擬機。
有兩種類型的節(jié)點：經(jīng)理和工人。
如果您尚未閱讀群體模式概述和關(guān)鍵概念。
管理器節(jié)點
Manager節(jié)點處理集群管理任務(wù)：
維護集群狀態(tài)
調(diào)度服務(wù)
提供群集模式 HTTP API 端點
使用 Raft 實施，管理人員可以保持整個群體及其上運行的所有服務(wù)的一致內(nèi)部狀態(tài)。出于測試目的，可以使用單個管理器運行群集。如果單管理器群中的管理器出現(xiàn)故障，您的服務(wù)將繼續(xù)運行，但您需要創(chuàng)建一個新群集以進行恢復(fù)。
為了利用群模式的容錯功能，Docker 建議您根據(jù)貴組織的高可用性要求實施奇數(shù)個節(jié)點。當(dāng)你有多個管理器時，你可以在沒有停機時間的情況下從管理器節(jié)點的故障中恢復(fù)。
三管理者群體容忍一名管理人員的最大損失。
五管理者群體最多可同時丟失兩個管理節(jié)點。
一個
N經(jīng)理集群將容忍最多損失(N-1)/2經(jīng)理。
Docker 推薦一個群體最多有七個管理節(jié)點。
重要提示：添加更多管理者并不意味著可擴展性或更高的性能。一般來說，情況正好相反。
工人節(jié)點
工作者節(jié)點也是 Docker Engine 的實例，其唯一目的是執(zhí)行容器。工作者節(jié)點不參與 Raft 分布式狀態(tài)，進行調(diào)度決策或服務(wù)于群集模式 HTTP API。
您可以創(chuàng)建一個管理節(jié)點群，但不能有一個沒有至少一個管理節(jié)點的工作節(jié)點。默認情況下，所有經(jīng)理都是工人。在單個管理器節(jié)點集群中，您可以像運行命令那樣運行命令docker service create，而且計劃程序?qū)阉腥蝿?wù)放在本地引擎上。
要阻止調(diào)度程序?qū)⑷蝿?wù)放置到多節(jié)點群中的管理器節(jié)點上，請將管理器節(jié)點的可用性設(shè)置為Drain。調(diào)度程序正常地停止Drain模式中節(jié)點上的任務(wù)，并調(diào)度Active節(jié)點上的任務(wù)。調(diào)度程序不會將新任務(wù)分配給具有Drain可用性的節(jié)點。
請參閱docker node update命令行參考以了解如何更改節(jié)點可用性。
改變角色
您可以通過運行將工作節(jié)點提升為管理員docker node promote。例如，當(dāng)您將管理器節(jié)點離線進行維護時，您可能需要升級工作節(jié)點。請參閱節(jié)點宣傳。
您也可以將管理器節(jié)點降級為工作節(jié)點。請參閱節(jié)點降級。
學(xué)到更多
了解群集模式服務(wù)如何工作。
了解 PKI 如何在群集模式下工作。