kubernetes 重启策略的always 和on failure 之间有什么区别? [英] What is the difference between always and on failure for kubernetes restart policy?

问题描述

我发现的 Kubernetes 中重启策略的最佳来源是:

The best source for restart policies in Kubernetes I have found is this:

http://kubernetes.io/docs/user-guide/pods/multi-container/#restartpolicy

但它只列出了可能的 restartPolicy 值，并没有解释它们.

But it only lists the possible restartPolicy values and does not explain them.

Always 和 OnFailure 有什么区别?东西在重新启动之前不是必须失败吗?

What is the difference between Always and OnFailure? Mustn't the thing fail before it can be restarted?

推荐答案

Always 意味着即使容器以零退出代码(即成功)退出，也会重新启动.当您不关心容器退出的原因时，这很有用，您只想确保它始终在运行(例如 Web 服务器).这是默认设置.

Always means that the container will be restarted even if it exited with a zero exit code (i.e. successfully). This is useful when you don't care why the container exited, you just want to make sure that it is always running (e.g. a web server). This is the default.

OnFailure 意味着容器只有在以非零退出代码退出时才会重新启动(即出现问题).当您想使用 pod 完成某个任务并确保它成功完成时，这很有用 - 如果没有成功，它将重新启动，直到它完成.

OnFailure means that the container will only be restarted if it exited with a non-zero exit code (i.e. something went wrong). This is useful when you want accomplish a certain task with the pod, and ensure that it completes successfully - if it doesn't it will be restarted until it does.

Never 表示容器无论退出的原因都不会重新启动.

Never means that the container will not be restarted regardless of why it exited.

从kubectl run --help可以看出，这些不同的重启策略基本上映射到不同的控制器类型:

These different restart policies basically map to the different controller types as you can see from kubectl run --help:

--restart="Always":此 Pod 的重启策略.合法值 [Always、OnFailure、Never].如果设置为Always"，则为此 pod 创建部署，如果设置为OnFailure"，则为此 pod 创建作业，如果设置为Never"，则创建常规 pod.对于后两个 --replicas 必须为 1.默认 'Always'

--restart="Always": The restart policy for this Pod. Legal values [Always, OnFailure, Never]. If set to 'Always' a deployment is created for this pod, if set to 'OnFailure', a job is created for this pod, if set to 'Never', a regular pod is created. For the latter two --replicas must be 1. Default 'Always'

以及 pod 用户指南:

ReplicationController 仅适用于 RestartPolicy = Always 的 Pod.作业仅适用于 RestartPolicy 等于 OnFailure 或 Never 的 Pod.

ReplicationController is only appropriate for pods with RestartPolicy = Always. Job is only appropriate for pods with RestartPolicy equal to OnFailure or Never.

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