Proxmox Host SSH keys

Intended method:

Delete old ssh host keys:

 rm /etc/ssh/ssh_host_*

Reconfigure OpenSSH Server:

 dpkg-reconfigure openssh-server

Update all ssh client(s) at ~/.ssh/known_hosts

Then update certs and keys on each machine:

 pvecm updatecerts -f

If this fails (which it might), log into each troublesome node through SSHd and copy the public key from

 /etc/ssh/ssh_host_rsa_key.pub.

Copy this to

 /etc/pve/nodes/<node>/ssh_known_hosts

and prepend it with that machine's hostname. Assuming a hostname of pve1, this line should appear as

 pve1 ssh-rsa <key>

Then restart the SSH daemon:

 systemctl restart sshd