[zh] update concept workload pods
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@@ -558,16 +558,11 @@ specify a readiness probe. In this case, the readiness probe might be the same
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as the liveness probe, but the existence of the readiness probe in the spec means
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that the Pod will start without receiving any traffic and only start receiving
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traffic after the probe starts succeeding.
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If your container needs to work on loading large data, configuration files, or
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migrations during startup, specify a readiness probe.
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-->
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如果要仅在探测成功时才开始向 Pod 发送请求流量,请指定就绪态探针。
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在这种情况下,就绪态探针可能与存活态探针相同,但是规约中的就绪态探针的存在意味着
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Pod 将在启动阶段不接收任何数据,并且只有在探针探测成功后才开始接收数据。
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如果你的容器需要加载大规模的数据、配置文件或者在启动期间执行迁移操作,可以添加一个
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就绪态探针。
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<!--
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If you want your container to be able to take itself down for maintenance, you
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can specify a readiness probe that checks an endpoint specific to readiness that
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@@ -576,6 +571,27 @@ is different from the liveness probe.
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如果你希望容器能够自行进入维护状态,也可以指定一个就绪态探针,检查某个特定于
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就绪态的因此不同于存活态探测的端点。
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<!--
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If your app has a strict dependency on back-end services, you can implement both
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a liveness and a readiness probe. The liveness probe passes when the app itself
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is healthy, but the readiness probe additionally checks that each required
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back-end service is available. This helps you avoid directing traffic to Pods
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that can only respond with error messages.
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If your container needs to work on loading large data, configuration files, or
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migrations during startup, you can use a
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[startup probe](#when-should-you-use-a-startup-probe). However, if you want to
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detect the difference between an app that has failed and an app that is still
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processing its startup data, you might prefer a readiness probe.
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-->
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如果你的应用程序对后端服务有严格的依赖性,你可以同时实现存活态和就绪态探针。
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当应用程序本身是健康的,存活态探针检测通过后,就绪态探针会额外检查每个所需的后端服务是否可用。
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这可以帮助你避免将流量导向只能返回错误信息的 Pod。
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如果你的容器需要在启动期间加载大型数据、配置文件或执行迁移,你可以使用
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[启动探针](#when-should-you-use-a-startup-probe)。
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然而,如果你想区分已经失败的应用和仍在处理其启动数据的应用,你可能更倾向于使用就绪探针。
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{{< note >}}
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<!--
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If you want to be able to drain requests when the Pod is deleted, you do not
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@@ -690,7 +706,7 @@ An example flow:
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<!--
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1. If one of the Pod's containers has defined a `preStop`
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[hook](/docs/concepts/containers/container-lifecycle-hooks/#hook-details), the kubelet
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[hook](/docs/concepts/containers/container-lifecycle-hooks), the kubelet
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runs that hook inside of the container. If the `preStop` hook is still running after the
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grace period expires, the kubelet requests a small, one-off grace period extension of 2
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seconds.
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@@ -702,7 +718,7 @@ An example flow:
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order. If the order of shutdowns matters, consider using a `preStop` hook to synchronize.
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-->
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1. 如果 Pod 中的容器之一定义了 `preStop`
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[回调](/zh/docs/concepts/containers/container-lifecycle-hooks/#hook-details),
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[回调](/zh/docs/concepts/containers/container-lifecycle-hooks),
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`kubelet` 开始在容器内运行该回调逻辑。如果超出体面终止限期时,`preStop` 回调逻辑
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仍在运行,`kubelet` 会请求给予该 Pod 的宽限期一次性增加 2 秒钟。
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