To delete a cluster node on proxmox we must first log in to the main proxmox server by SSH
# root@ipserver-proxmox
after that we identify the node with the command
# pvecm nodes
If the node that appears is only one other node does not appear due to a misconfiguration from the start, what we have to do is find out the name of the node first by
# cd /etc/pve/nodes/
Then enter, the name of the node that we want to delete will appear, to delete it run the command
# pvecm delnode namanode
If, at the time of deleting a node, a warning
cluster not ready - no quorum?
Then do the command
# pvecm expected 1
After that do the command again
# pvecm delnode namanode
Congratulations, you have successfully removed the cluster node you want