When starting or restarting Webmin, you observe “Cron 15501388847017 missing any time spec” in /var/webmin/miniserv.error
Note the CRON ID will be different.
The solution is to add interval=300 to said CRON. Here is a full transcript of what transpired:
[root@hostname ~]# service webmin restart
Stopping Webmin server in /usr/libexec/webmin
Starting Webmin server in /usr/libexec/webmin
…
Cron 15501388847017 missing any time spec
[root@hostname ~]# cd /etc/webmin/webmincron/crons/
[root@hostname crons]# ls
15501388806771.cron 15501388847017.cron 15501388897244.cron 15501388917244.cron 15501388927244.cron 155204386323899.cron
[root@hostname crons]# cat 15501388847017.cron
func=scheduled_collect_system_info
id=15501388847017
module=system-status
boot=1
arg0=boot
[root@hostname crons]# vi 15501388847017.cron
[root@hostname crons]# cat 15501388847017.cron
func=scheduled_collect_system_info
id=15501388847017
module=system-status
boot=1
arg0=boot
interval=300
[root@hostname crons]# service webmin restart
Stopping Webmin server in /usr/libexec/webmin
Starting Webmin server in /usr/libexec/webmin
…
[root@hostname crons]#
Reference:
https://github.com/webmin/webmin/issues/994