How to remove Cluster from Proxmox 6

 https://pve.proxmox.com/pve-docs/pve-admin-guide.html#pvecm_separate_node_without_reinstall

 
On cluster master server do: 
systemctl stop pve-cluster corosync 
pmxcfs -l 
rm /etc/corosync/* 
rm /etc/pve/corosync.conf 
killall pmxcfs 
systemctl start pve-cluster
 
Server should become single node.

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