Proxmox's documentation shows the following here.

Which mainly just says change /etc/hosts and /etc/hostname with your new hostname.

Here's what happens if you only do that:

If you just do the above, you will find you have an inaccessible original hostname that contains those VMs and you cannot move or stop them.

You need to go into /etc/pve/nodes

You'll see the following inside:

oldhostname

newhostname

1.) Move both of those somewhere else.

2.) Create a dir called "newhostname"

3.) Copy the contents of "oldhostname" to "newhostname"

It's Fixed!

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