Prepare relevant DNS and/or /etc/hosts records for the new name.
If using DHCP, update the DHCP server’s configuration.
Change the hostname. This is usually done by editing /etc/hostname and rebooting. There are other options and details which are not in the scope of this document.
Run the script ovirt-engine-rename:
It’s otopi-based. This means, among other things, that it looks similar engine-setup/cleanup, and provides similar logging, options, etc.