用于停止Cron作业重叠的代码 [英] Code for stopping the overlapping of the Cron job

问题描述

我需要停止cron作业的重叠，例如：如果cron作业被安排在早上2时钟为DB备份和其他cron作业被安排在早上7时钟为DB备份再次。我需要停止如果2 o时钟的数据库备份未完成，则7时钟计划cron作业。

I need to stop the overlapping of cron jobs for example:If a cron job is scheduled at morning 2 o clock for DB backup and other cron job is scheduled at morning 7 o clock for DB backup again.So i need to stop the 7 o clock scheduled cron job if the DB backup for 2 o clock is not completed.

推荐答案

这是鸡群的用途。从 man flock ：

...
The  third form is convenient inside shell scripts, and is usually used
       the following manner:

       (
         flock -n 9 || exit 1
         # ... commands executed under lock ...
       ) 9>/var/lock/mylockfile
...

$ b b

在这种情况下，flock会尝试在fd 9上为 / var / lock / myfile 获得一个锁。如果它不能（因为早期的作业仍在运行），它将退出。

In this case, flock will try to get a lock on fd 9 for /var/lock/myfile. If it can't (because the earlier job is still running), it will exit.

您需要将它放在脚本中。

You need to put it in a script.

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