如何设置Kubernetes作业的时间限制？ [英] How to set a time limit for a Kubernetes job?

问题描述

我想启动Kubernetes工作，并给它一个固定的截止日期。如果在截止日期到来之前吊舱仍在运行，我希望该作业自动终止。

I'd like to launch a Kubernetes job and give it a fixed deadline to finish. If the pod is still running when the deadline comes, I'd like the job to automatically be killed.

是否存在类似的东西？ （起初，我以为Job规范的 activeDeadlineSeconds 涵盖了此用例，但现在我看到 activeDeadlineSeconds 仅将限制重新尝试工作的时间；它不会主动杀死慢/失控的工作。）

Does something like this exist? (At first I thought that the Job spec's activeDeadlineSeconds covered this use case, but now I see that activeDeadlineSeconds only places a limit on when a job is re-tried; it doesn't actively kill a slow/runaway job.)

推荐答案

通过使用GNU timeout 实用程序在容器的入口点命令上设置超时。

You can self-impose timeouts on the container's entrypoint command by using GNU timeout utility.

例如，以下计算作业pi的前4000个数字将在10秒后超时：

For example the following Job that computes first 4000 digits of pi will time out after 10 seconds:

apiVersion: batch/v1
kind: Job
metadata:
  name: pi
spec:
  template:
    metadata:
      name: pi
    spec:
      containers:
      - name: pi
        image: perl
        command: ["/usr/bin/timeout", "10", "perl", "-Mbignum=bpi", "-wle", "print bpi(4000)"]
      restartPolicy: Never

（清单取自 https://kubernetes.io/docs/concepts/workloads/controllers/jobs-run-to-completion /＃running-an-example-job ）

您可以玩这些数字，看看是否超时。通常，计算4000位数的pi在我的工作站上大约需要23秒，因此，如果将其设置为5秒，它可能总是会失败，而如果将其设置为120秒，它将总是可以工作。

You can play with the numbers and see it timeout or not. Typically computing 4000 digits of pi takes ~23 seconds on my workstation, so if you set it to 5 seconds it'll probably always fail and if you set it to 120 seconds it will always work.

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