Whether you need to change a proxmox node's ip or change them all the steps are the same. In my particular case, I have two networks, a fast network and a faster network, so I wanted to switch all my proxmox hosts to use the ip address associated with the faster network interface ... to do that
For each node in the cluster, change the
/etc/hosts file and make sure each hosts new ip address is associated with its name.
For each host, go ahead and run the following command