1.查看crontab是否安裝:

yum ?-y ?install ?vixie-cron

yum ?-y ?install ?crontabs

2.啟動：

systemctl ?start ?crond.service

3.查看狀態(tài):

systemctl ?status ?crond.service

4.關閉：

systemctl ?stop ?crond.service

5.重啟：

systemctl ?restart ?crond.service

6.開機運行：

systemctl ?enable ?crond.service