Merge pull request #44388 from my-git9/pod-lifecycle-94

[zh-cn] sync pods/pod-lifecycle.md

Author: k8s-ci-robot

content/zh-cn/docs/concepts/workloads/pods/pod-lifecycle.md

@@ -294,21 +294,44 @@ the `Terminated` state.
 The `spec` of a Pod has a `restartPolicy` field with possible values Always, OnFailure,
 and Never. The default value is Always.
 
-The `restartPolicy` applies to all containers in the Pod. `restartPolicy` only
-refers to restarts of the containers by the kubelet on the same node. After containers
-in a Pod exit, the kubelet restarts them with an exponential back-off delay (10s, 20s,
-40s, …), that is capped at five minutes. Once a container has executed for 10 minutes
-without any problems, the kubelet resets the restart backoff timer for that container.
+The `restartPolicy` applies to {{< glossary_tooltip text="app containers" term_id="app-container" >}}
+in the Pod and to regular [init containers](/docs/concepts/workloads/pods/init-containers/).
+[Sidecar containers](/docs/concepts/workloads/pods/sidecar-containers/)
+ignore the Pod-level `restartPolicy` field: in Kubernetes, a sidecar is defined as an
+entry inside `initContainers` that has its container-level `restartPolicy` set to `Always`.
+For init containers that exit with an error, the kubelet restarts the init container if
+the Pod level `restartPolicy` is either `OnFailure` or `Always`.
 -->
 ## 容器重启策略 {#restart-policy}
 
 Pod 的 `spec` 中包含一个 `restartPolicy` 字段，其可能取值包括
 Always、OnFailure 和 Never。默认值是 Always。
 
-`restartPolicy` 适用于 Pod 中的所有容器。`restartPolicy` 仅针对同一节点上
-`kubelet` 的容器重启动作。当 Pod 中的容器退出时，`kubelet`
+`restartPolicy` 应用于 Pod
+中的{{< glossary_tooltip text="应用容器" term_id="app-container" >}}和常规的
+[Init 容器](/zh-cn/docs/concepts/workloads/pods/init-containers/)。
+[Sidecar 容器](/zh-cn/docs/concepts/workloads/pods/sidecar-containers/)忽略
+Pod 级别的 `restartPolicy` 字段：在 Kubernetes 中，Sidecar 被定义为
+`initContainers` 内的一个条目，其容器级别的 `restartPolicy` 被设置为 `Always`。
+对于因错误而退出的 Init 容器，如果 Pod 级别 `restartPolicy` 为 `OnFailure` 或 `Always`，
+则 kubelet 会重新启动 Init 容器。
+
+<!--
+When the kubelet is handling container restarts according to the configured restart
+policy, that only applies to restarts that make replacement containers inside the
+same Pod and running on the same node. After containers in a Pod exit, the kubelet
+restarts them with an exponential back-off delay (10s, 20s,40s, …), that is capped at
+five minutes. Once a container has executed for 10 minutes without any problems, the
+kubelet resets the restart backoff timer for that container.
+[Sidecar containers and Pod lifecycle](/docs/concepts/workloads/pods/sidecar-containers/#sidecar-containers-and-pod-lifecycle)
+explains the behaviour of `init containers` when specify `restartpolicy` field on it.
+-->
+当 kubelet 根据配置的重启策略处理容器重启时，仅适用于同一 Pod
+内替换容器并在同一节点上运行的重启。当 Pod 中的容器退出时，`kubelet`
 会按指数回退方式计算重启的延迟（10s、20s、40s、...），其最长延迟为 5 分钟。
 一旦某容器执行了 10 分钟并且没有出现问题，`kubelet` 对该容器的重启回退计时器执行重置操作。
+[Sidecar 容器和 Pod 生命周期](/zh-cn/docs/concepts/workloads/pods/sidecar-containers/#sidecar-containers-and-pod-lifecycle)中解释了
+`init containers` 在指定 `restartpolicy` 字段时的行为。
 
 <!--
 ## Pod conditions
@@ -327,7 +350,7 @@ Kubelet 管理以下 PodCondition：
 
 <!--
 * `PodScheduled`: the Pod has been scheduled to a node.
-* `PodReadyToStartContainers`: (alpha feature; must be [enabled explicitly](#pod-has-network)) the
+* `PodReadyToStartContainers`: (beta feature; enabled by [default](#pod-has-network)) the
   Pod sandbox has been successfully created and networking configured.
 * `ContainersReady`: all containers in the Pod are ready.
 * `Initialized`: all [init containers](/docs/concepts/workloads/pods/init-containers/)
@@ -336,7 +359,7 @@ Kubelet 管理以下 PodCondition：
   balancing pools of all matching Services.
 -->
 * `PodScheduled`：Pod 已经被调度到某节点；
-* `PodReadyToStartContainers`：Pod 沙箱被成功创建并且配置了网络（Alpha 特性，必须被[显式启用](#pod-has-network)）；
+* `PodReadyToStartContainers`：Pod 沙箱被成功创建并且配置了网络（Beta 特性，[默认](#pod-has-network)启用）；
 * `ContainersReady`：Pod 中所有容器都已就绪；
 * `Initialized`：所有的 [Init 容器](/zh-cn/docs/concepts/workloads/pods/init-containers/)都已成功完成；
 * `Ready`：Pod 可以为请求提供服务，并且应该被添加到对应服务的负载均衡池中。
@@ -369,7 +392,7 @@ specify a list of additional conditions that the kubelet evaluates for Pod readi
 -->
 ### Pod 就绪态        {#pod-readiness-gate}
 
-{{< feature-state for_k8s_version="v1.14" state="stable" >}}
+{{< feature-state for_k8s_version="v1.29" state="beta" >}}
 
 你的应用可以向 PodStatus 中注入额外的反馈或者信号：**Pod Readiness（Pod 就绪态）**。
 要使用这一特性，可以设置 Pod 规约中的 `readinessGates` 列表，为 kubelet
@@ -464,26 +487,28 @@ When a Pod's containers are Ready but at least one custom condition is missing o
 
 {{< note >}}
 <!--
-This condition was renamed from PodHasNetwork to PodReadyToStartContainers.
+During its early development, this condition was named `PodHasNetwork`.
 -->
-这种状况已从 PodHasNetwork 重命名为 PodReadyToStartContainers。
+在其早期开发过程中，这种状况被命名为 `PodHasNetwork`。
 {{< /note >}}
 
 <!--
-After a Pod gets scheduled on a node, it needs to be admitted by the Kubelet and
-have any volumes mounted. Once these phases are complete, the Kubelet works with
+After a Pod gets scheduled on a node, it needs to be admitted by the kubelet and
+to have any required storage volumes mounted. Once these phases are complete,
+the Kubelet works with
 a container runtime (using {{< glossary_tooltip term_id="cri" >}}) to set up a
 runtime sandbox and configure networking for the Pod. If the
-`PodReadyToStartContainersCondition` [feature gate](/docs/reference/command-line-tools-reference/feature-gates/) is enabled,
-Kubelet reports whether a pod has reached this initialization milestone through
-the `PodReadyToStartContainers` condition in the `status.conditions` field of a Pod.
+`PodReadyToStartContainersCondition`
+[feature gate](/docs/reference/command-line-tools-reference/feature-gates/) is enabled
+(it is enabled by default for Kubernetes {{< skew currentVersion >}}), the
+`PodReadyToStartContainers` condition will be added to the `status.conditions` field of a Pod.
 -->
-在 Pod 被调度到某节点后，它需要被 Kubelet 接受并且挂载所需的卷。
+在 Pod 被调度到某节点后，它需要被 kubelet 接受并且挂载所需的存储卷。
 一旦这些阶段完成，Kubelet 将与容器运行时（使用{{< glossary_tooltip term_id="cri" >}}）
 一起为 Pod 生成运行时沙箱并配置网络。如果启用了 `PodReadyToStartContainersCondition` 
-[特性门控](/zh-cn/docs/reference/command-line-tools-reference/feature-gates/)，
-kubelet 会通过 Pod 的 `status.conditions` 字段中的 `PodReadyToStartContainers` 状况来报告
-Pod 是否达到了初始化里程碑。
+[特性门控](/zh-cn/docs/reference/command-line-tools-reference/feature-gates/)
+（Kubernetes {{< skew currentVersion >}} 版本中默认启用），
+`PodReadyToStartContainers` 状况会被添加到 Pod 的 `status.conditions` 字段中。
 
 <!--
 The `PodReadyToStartContainers` condition is set to `False` by the Kubelet when it detects a
@@ -980,6 +1005,39 @@ feature gate `EndpointSliceTerminatingCondition` is enabled.
 上述行为是在 EndpointSliceTerminatingCondition 特性门控被启用时描述的。
 {{</note>}}
 
+{{<note>}}
+<!--
+Beginning with Kubernetes 1.29, if your Pod includes one or more sidecar containers
+(init containers with an Always restart policy), the kubelet will delay sending
+the TERM signal to these sidecar containers until the last main container has fully terminated.
+The sidecar containers will be terminated in the reverse order they are defined in the Pod spec.
+This ensures that sidecar containers continue serving the other containers in the Pod until they are no longer needed.
+-->
+从 Kubernetes 1.29 开始，如果你的 Pod 包含一个或多个 Sidecar
+容器（重启策略为 `Always` 的 Init 容器），kubelet 将延迟向这些
+Sidecar 容器发送 TERM 信号，直到最后一个主容器完全终止。
+Sidecar 容器将以 Pod 规约中定义的相反顺序终止。
+这可确保 Sidecar 容器继续为 Pod 中的其他容器提供服务，直到不再需要它们为止。
+
+<!--
+Note that slow termination of a main container will also delay the termination of the sidecar containers.
+If the grace period expires before the termination process is complete, the Pod may enter emergency termination.
+In this case, all remaining containers in the Pod will be terminated simultaneously with a short grace period.
+-->
+请注意，主容器的缓慢终止也会延迟边车容器的终止。
+如果宽限期在终止过程完成之前到期，Pod 可能会进入紧急终止状态。
+在这种情况下，Pod 中的所有剩余容器将在短暂的宽限期内同时终止。
+
+<!--
+Similarly, if the Pod has a preStop hook that exceeds the termination grace period, emergency termination may occur.
+In general, if you have used preStop hooks to control the termination order without sidecar containers, you can now
+remove them and allow the kubelet to manage sidecar termination automatically.
+-->
+同样，如果 Pod 的 preStop 回调超过了终止宽限期，则可能会发生紧急终止。
+一般来说，如果你在没有 Sidecar 容器的情况下使用 preStop 回调来控制终止顺序，
+那么现在可以删除它们从而允许 kubelet 自动管理 Sidecar 终止。
+{{</note>}}
+
 <!--
 1. When the grace period expires, the kubelet triggers forcible shutdown. The container runtime sends
    `SIGKILL` to any processes still running in any container in the Pod.
@@ -1128,12 +1186,15 @@ for more details.
 
 * Learn more about [container lifecycle hooks](/docs/concepts/containers/container-lifecycle-hooks/).
 
+* Learn more about [sidecar containers](/docs/concepts/workloads/pods/sidecar-containers/).
+
 * For detailed information about Pod and container status in the API, see
   the API reference documentation covering
   [`status`](/docs/reference/kubernetes-api/workload-resources/pod-v1/#PodStatus) for Pod.
 -->
 * 动手实践[为容器生命周期时间关联处理程序](/zh-cn/docs/tasks/configure-pod-container/attach-handler-lifecycle-event/)。
 * 动手实践[配置存活态、就绪态和启动探针](/zh-cn/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/)。
 * 进一步了解[容器生命周期回调](/zh-cn/docs/concepts/containers/container-lifecycle-hooks/)。
+* 进一步了解 [Sidecar 容器](/zh-cn/docs/concepts/workloads/pods/sidecar-containers/)。
 * 关于 API 中定义的有关 Pod 和容器状态的详细规范信息，
   可参阅 API 参考文档中 Pod 的 [`status`](/zh-cn/docs/reference/kubernetes-api/workload-resources/pod-v1/#PodStatus) 字段。