Crontab will not working

Question

I wrote a task script for automatic alarm, but he did not work.

but, Manual execution is working, I do not know which link is wrong.

Thank you.

~# ps aux | grep cron
root       452  0.0  0.0  29008  2924 ?        Ss   00:16   0:00 /usr/sbin/cron -f
root     11968  0.0  0.0  14224   960 pts/0    S+   10:34   0:00 grep --color=auto cron

~# crontab -l
MAILTO=mail@mail
15 3 * * 7 letsencrypt renew
*/2 * * * * root /opt/disk-alarm/disk_alarm.sh > /dev/null 2>&1

Answer 1

Check your syntax. Try:

*/2 * * * * /opt/disk-alarm/disk_alarm.sh

Comments

Thank you for your help.
crontab is working.