1. If it isn't obvious, migrate all VMs/Containers off of the node you'll be removing.
2. List all nodes
pvecm nodes3. Permanently shutdown the node you'll be removing. This node can never join the cluster again.
4. Remove the node from the cluster.
pvecm delnode NodeName5. Remove the node from the PVE GUI.
ls -l /etc/pve/nodes/
rm /etc/pve/nodes/NodeName