Remove Node from Cluster

Introduction 

 

 These are the steps if a node needs to be removed entirely from the cluster and function as a single node 

 

 Steps 

 

 

 Remove or mitigate all VMs and containers from nodes that will be decommissioned 

 Create a ZFS snapshot of rpool and rpool/data on the single node 

 Delete the nodes that will be decommissioned 

 Remove the cluster config 

 (Optional) Disable cluster/HA services 

 

 

 Snapshot 

 zfs snapshot rpool@<date>

zfs snapshot rpool/data@<date> 

 Turn off the decommissioned node 

 Remove the decommissioned nodes from the single node 

 pvecm delnode <nodename> 

 Run the following to  delete the cluster and create a single node 

 It may be best to run this line by line to see the output. 

 systemctl stop pve-cluster corosync

pmxcfs -l

rm /etc/corosync/*

rm /etc/pve/corosync.conf

killall pmxcfs

systemctl start pve-cluster 

 (Optional) Disable cluster/HA services 

 systemctl disable --now pve-ha-crm pve-ha-lrm corosync.service