One of the key features of Proxmox VE is its ability to create and manage clusters of nodes, which can be used to provide high availability and scalability.
However, it’s important to note that a Proxmox VE cluster requires a minimum of three nodes in order to function properly. Without at least three nodes, you may not be able to log in to the Proxmox VE GUI and make changes.
If you find yourself in a situation where you need to remove a node from a Proxmox VE cluster, there are several steps that you can follow to ensure a smooth and successful removal process. Login to node using ssh and run following commands:
systemctl stop pve-cluster
systemctl stop corosync
pmxcfs -l
rm /etc/pve/corosync.conf
rm -r /etc/corosync/*
killall pmxcfs
systemctl start pve-cluster
Here’s an explanation for each step:
-
systemctl stop pve-cluster: This command stops thepve-clusterservice, which is responsible for managing the Proxmox VE cluster. -
systemctl stop corosync: This command stops thecorosyncservice, which is used for cluster communication and coordination. -
pmxcfs -l: This command lists the current status of thepmxcfsservice, which provides a distributed configuration file system for the cluster. If the pmxcfs service is properly stopped, the output of thepmxcfs -lcommand will be empty, indicating that there are no running pmxcfs processes on the node. -
rm /etc/pve/corosync.conf: This command removes thecorosync.confconfiguration file. -
rm -r /etc/corosync/*: This command removes all files and directories in the/etc/corosync directory, which is used for cluster configuration. -
killall pmxcfs: This command kills all running processes for thepmxcfsservice. -
systemctl start pve-cluster: This command starts the pve-cluster service, which will initiate a new empty cluster connection on the current node.
Once you’ve removed the cluster connection, you can then start a new connection on the same node.