Corosync

Documentation

https://pve.proxmox.com/pve-docs/chapter-pvecm.html

Reference

Edit configuration

https://pve.proxmox.com/pve-docs/chapter-pvecm.html#pvecm_edit_corosync_conf

nano /etc/pve/corosync.conf

Force quorum

pvecm expected 1

Force remove node from cluster

https://pve.proxmox.com/pve-docs/chapter-pvecm.html#pvecm_separate_node_without_reinstall

Remove node from cluster

pvecm delnode <node>

Stop services

systemctl stop corosync.service pve-cluster.service

Start filesystem in local mode

pmxcfs -l

Remove configuration

rm /etc/pve/corosync.conf
rm /var/lib/corosync/*
rm -r /etc/corosync/*

Restart cluster service

killall pmxcfs
systemctl start pve-cluster.service