kubernetes重新启动策略的始终失败与失败之间有什么区别? [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

但是它仅列出可能的restartPolicy值，而没有解释它们.

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

Always和OnFailure有什么区别?事情在重启之前一定不会失败吗?

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

推荐答案

始终表示即使容器以零退出代码(即成功退出)退出，容器也将重新启动.当您不在乎容器为何退出而只想确保其始终处于运行状态(例如网络服务器)时，这很有用.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 意味着仅当容器以非零退出代码退出(即出现问题)时，才会重新启动容器.当您要使用广告连播完成特定任务并确保它成功完成时，此功能很有用-如果没有完成，它将重新启动直到完成.

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.

从不表示容器无论退出原因为何都不会重新启动.

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

从kubectl run --help中可以看到，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 =始终":此Pod的重新启动策略.合法值[始终，OnFailure，从不].如果设置为始终"，则为该容器创建一个部署；如果设置为"OnFailure"，则为此容器创建一个作业；如果设置为从不"，则创建一个常规容器.对于后两个--replicas必须为1.默认为始终"

--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'

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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