centos 7 配置定时任务crontab

修改crontab配置

vi /etc/crontab

crontab语法 

*    *    *   *    *  Command_to_execute
|    |    |    |   |       
|    |    |    |    Day of the Week ( 0 - 6 ) ( Sunday = 0 )
|    |    |    |
|    |    |    Month ( 1 - 12 )
|    |    |
|    |    Day of Month ( 1 - 31 )
|    |
|    Hour ( 0 - 23 )
|
Min ( 0 - 59 )

  启动、重启、停止crond服务

sudo service crond start/restart/stop

 查看crond的日志

cat /var/log/cron

 

 常见问题

1.重启crond出现错误：(CRON) DEATH (can't lock /var/run/crond.pid, otherpid may be 97764): 资源暂时不可用

  直接kill -9 [pid] 把现有的crond进程干掉，然后 sudo service crond restart

 

 

https://www.cyberciti.biz/faq/howto-linux-unix-start-restart-cron/