Solution to the inconsistency between crontab execution time and system time

Preface

In LINUX, periodic tasks are usually handled by the cron daemon process [ps -ef | grep cron]. Cron reads one or more configuration files that contain command lines and the times they are called.

The cron configuration file is called "crontab", which is short for "cron table".

Cron is a scheduled execution tool under Linux that can run jobs without human intervention.

service crond start //Start the service service crond stop //Shut down the service service crond restart //Restart the service service crond reload //Reload the configuration service crond status //Check the service status

Find the problem

The thing is that there is a crontab like the following on your own service

10 0 * * * root echo 'xxx' >> zzz

Those who are familiar with it know that it is executed at 00:10 at night and outputs xxx to the zzz file

But the problem is that this crontab is not executed at 00:10! Instead, it is executed at 12:10 noon.

The crontab execution time is inconsistent with the system time! ! ! !

I remember the server time zone was changed and it is now CST time zone. There is no reason not to execute it!

I tried to google crontab time zone, and I found several similar examples.

It turns out that crontab must be restarted manually after the time is modified

/etc/init.d/crond restart

I have to restart crontab. Restarting the server is useless. I changed the time zone and restarted the server, but it was useless. I have to restart crontab!

There is another situation where the time zone is divided into two, one is timezone and the other is localtime. Follow the following command to solve it

cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
service crond restart

Summarize

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