I wrote a post a while ago covering the use of Monit to monitor services running and the use case I covered was to ensure these services restarted on failure. While a useful feature of Monit, it seems to be now a little redundant with SystemD having a built in restart feature. Same use case where MySQL (or MariaDB in this case) is being killed by Apache’s oom killer. I first copied the original systemd file associated with Mariadb from /usr/lib/systemd/system/mariadb.

I decided to try the upgrade process from EL 6 to 7 on the servers I used in my previous blog post “Windows (CIFS) fileshares using GlusterFS and CTDB for Highly available data” Following the instructions here I found the process fairly painless. However there were 1 or two little niggles which caused various issues which I will detail here. The servers were minimal CentOS 6.5 installs, with Gluster volumes shared via CTDB.