What to do if Centos crontab does not execute
The steps to troubleshoot the cause are as follows:
1. First, confirm whether the server has enabled timing Task planning service, only the root user can open and close the crond service
[root@mimvp-bj script]# service crond status crond is stopped
2. Turn on the scheduled task planning service
[root@mimvp-bj script]# service crond start Starting crond: [ OK ]
3. Check the status of the scheduled task planning service (recommended learning : navicat tutorial)
[root@mimvp-bj script]# service crond status crond (pid 24577) is running…
4. Check the crontab output log and troubleshoot
cat /var/spool/cron/root # root用户就是root文件
5. Check the crontab task format. If the format is incorrect, it is not correct. Will execute
SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin MAILTO=root HOME=/ # .—————- minute (0 – 59) # | .————- hour (0 – 23) # | | .———- day of month (1 – 31) # | | | .——- month (1 – 12) OR jan,feb,mar,apr … # | | | | .—- day of week (0 – 6) (Sunday=0 or 7) OR #sun,mon,tue,wed,thu,fri,sat # | | | | | # m h dom mon dow command # * * * * * command will be executed
For example:
*/5 * * * * root /usr/libexec/atrun
Parameter explanation:
minute（m） ： 代表一小时内的第几分，范围 0-59。 hour （h） ： 代表一天中的第几小时，范围 0-23。 mday （dom） ： 代表一个月中的第几天，范围 1-31。 month （mon） ： 代表一年中第几个月，范围 1-12。 wday dow） ： 代表星期几，范围 0-7 (0及7都是星期天)。 who ： 要使用什么身份执行该指令，当您使用 crontab -e 时，不必加此字段。 command（command）： 所要执行的指令。
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