Restarting cron after changing crontab file?
更改crontable文件后，我是否必须重新启动cron？
No.
From the cron man page:
...cron will then examine the modification time on all crontabs and reload those which have changed. Thus cron need not be restarted whenever a crontab file is modified
But if you just want to make sure its done anyway,
sudo service cron reload
or
/etc/init.d/cron reload
On CentOS with cPanel sudo /etc/init.d/crond reload does the trick.
On CentOS7: sudo systemctl start crond.service
I had a similar issue on 16.04 VPS Digital Ocean. If you are changing crontabs, make sure to run
sudo service cron restart
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