If you’ve tried to change the hostname on your OVH public cloud instance running CentOS 7, you may have had issues with it persisting after reboot.
Took me way to long to find this solution, but someone had already spent way too much time figuring it out.
This GitHub Gist explains it all https://gist.github.com/zmjwong/77ee37deb1749c2582eb
Basically you need to edit /etc/cloud/cloud.cfg and add “preserve_hostname: true” and then set your hostname using hostnamectl.
hostnamectl –transient set-hostname your.new.hostname
hostnamectl –static set-hostname your.new.hostname
Hope that helps and thank zmjwong!