在重新启动之前让 cron 等待作业完成 [英] Have cron wait for job to finish before re-launching

问题描述

我有一个 cronjob，它每隔一分钟执行一次，通常在几秒钟内运行，但有时会持续几分钟.

I have a cronjob that executes every second minute that usually runs in seconds, but sometimes for several minutes.

如果下一分钟到来时它已经在运行，我需要 cron 不执行该命令.

I need cron to not execute the command if it's already running when the next minute comes.

这条线看起来像这样*/1 * * * * cmd

The line looks like this */1 * * * * cmd

我试过这个* * * * * ID=job1 频率=1m AFTER=job1 cmd

I have tried with this * * * * * ID=job1 FREQ=1m AFTER=job1 cmd

但没有成功.

是否可以用 cron 解决或者我必须实现锁定?

Is it possible to solve with cron or do I have to implement locking?

推荐答案

您可以制作一个名为 inProgress(或其他)的临时文件并将其存储在标准位置，并使用它与下一个工作进行通信(如果它应该运行)与否.

You can make a temp file called inProgress (or whatever) and store it in a standard place, and use this to communicate to the next job if it should run or not.

如果工作流程是这样的:

What if flow of the job goes like this:

1. 检查标准进度文件
2. 如果存在，退出
3. 否则，创建inProgress文件
4. 工作
5. 删除正在进行的文件.

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