After setting up email notifications on a new install I received errors from CentOS’s yum-cron claiming that the hourly cron task could not run because it was already running. That seems to have been caused by rockstor constantly calling yum:
[root@big ~]# ps aux | grep yum
root 20487 0.4 0.0 348372 30876 ? S 15:41 0:00 /usr/bin/python /usr/bin/yum changelog 1 glib-networking.x86_64
root 20645 0.6 0.0 348372 31280 ? S 15:41 0:00 /usr/bin/python /usr/bin/yum changelog 1 cronie-anacron.x86_64
root 20695 0.7 0.0 348344 31260 ? S 15:41 0:00 /usr/bin/python /usr/bin/yum changelog 2017-Jul-03 rockstor
root 20928 1.6 0.0 348368 31344 ? S 15:41 0:00 /usr/bin/python /usr/bin/yum changelog 1 gsettings-desktop-schemas.x86_64
root 20953 11.0 0.0 1477972 35868 ? Sl 15:41 0:00 /usr/bin/python /usr/bin/yum changelog 1 NetworkManager.x86_64
root 20975 0.0 0.0 112656 2320 pts/0 S+ 15:41 0:00 grep --color=auto yum
I set the debug level on yum-cron-hourly.conf to -3 to mute the messages… but it’s a bit strange to get error emails on a new stable install