Proxmox Cluster Manager

https://pve.proxmox.com/wiki/Cluster_Manager

https://pve.proxmox.com/wiki/Separate_Cluster_Network

https://pve.proxmox.com/wiki/Proxmox_VE_4.x_Cluster

https://pve.proxmox.com/wiki/Proxmox_Cluster_file_system_%28pmxcfs%29

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Remove all cluster configs

systemctl stop pvestatd.service
systemctl stop pvedaemon.service
systemctl stop pve-cluster.service
systemctl stop corosync
systemctl stop pve-cluster
pmxcfs -l
rm /etc/pve/corosync.conf
rm /etc/corosync/*
rm /var/lib/corosync/*
rm -rf /etc/pve/nodes/*
sqlite3 /var/lib/pve-cluster/config.db "select * from tree where name='corosync.conf'"
sqlite3 /var/lib/pve-cluster/config.db "delete from tree where name='corosync.conf'"
sqlite3 /var/lib/pve-cluster/config.db "select * from tree where name='corosync.conf'"
reboot