Centos 7 定时任务多次启动

systemctl start crond
systemctl stop crond
systemctl restart crond
systemctl reload crond

（1）停止crontab，systemctl stop crond
（2）查看cron进程数ps -A | grep cron如有多个使用kill进行杀掉
（3）启动crontab，systemctl start crond