在重新启动之前，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执行每秒钟，通常运行在几秒钟，但有时几分钟。

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

我需要cron在下一分钟到来时不执行命令。

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

看起来像这样
* / 1 * * * * cmd

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

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

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

但无法成功。

实现锁定

推荐答案

您可以创建一个名为inProgress的临时文件（或其他），并将其存储在标准位置，

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.

如果工作流程如下：

1. 检查标准inProgress
   文件


2. 如果存在，请退出


3. ，创建inProgress文件


4. 执行工作


5. 删除inProgress文件。

1. Check for a standard inProgress file
2. If it exists, quit
3. Else, create inProgress file
4. Do work
5. Delete inProgress file.

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