delete proxmox cluster

del_cluster.sh

#/bin/sh
# source: https://forum.proxmox.com/threads/removing-deleting-a-created-cluster.18887/

set -x

# stop service
systemctl stop pvestatd.service
systemctl stop pvedaemon.service
systemctl stop pve-cluster.service
systemctl stop corosync
systemctl stop pve-cluster

# create update sql
cat <<EOM > /tmp/update.sql
delete from tree where name = 'corosync.conf';
.quit
EOM

# update sql
sqlite3 -echo /var/lib/pve-cluster/config.db < /tmp/update.sql
rm -f /tmp/update.sql

# remove directories
pmxcfs -l
rm /etc/pve/corosync.conf
rm /etc/corosync/*
rm /var/lib/corosync/*
rm -rf /etc/pve/nodes/*
rm /etc/pve/priv/known_hosts