I know that there are a lot of tutorials on how to do this but not any that are easy at first sight.
Let’s get right into it
Open up your servers shell environment and do the below
nano /etc/hosts nano /etc/hostname nano /etc/postfix/main.cf cd /etc/pve/nodes/ cp -r old new rm -r old cd /var/lib/rrdcached/db/pve2-node/ cp -r old new rm -r old
Credit to Apmuthu on the Proxmox Forum
Hope this helps!