proxmox-cluster-remove

Remove cluster from proxmox Shut down the other nodes. This step is important to isolate the node from the rest of the cluster and avoid corosync or other services to copy back deleted files on the local node we're gonna act on.

systemctl stop pve-cluster corosync

Remove corosync config to ensure the node is no longer part of the cluster:

rm /etc/pve/corosync.conf

Clean up the cluster configuration:

rm -rf /etc/corosync/*
ls /etc/pve/nodes #show all nodes data in folders, delete the other nodes folders
rm -rf /etc/pve/nodes/<other_node_name> #just to be sure to delete data of other nodes