When using UI Web interface to add node into cluster, the following error occurred
ERROR: TFA-enabled login currently works only with a TTY. at /usr/share/perl5/PVE/APIClient/LWP.pm line 100Use command line below to add node via Shell
pvecm add <target ip> -link0 <source ip>If got error on key validation, try node name instead
pvecm add <target_dns_name>When adding the Proxmox node into existing cluster, the IP to DNS reverse lookup has different name, miss configuration. Then the new node thought it is already a member of cluster, but other nodes are not.
Convert the node back to local mode
Stop the corosync and pve-cluster services on the node:
systemctl stop pve-cluster
systemctl stop corosyncStart the cluster file system again in local mode:
pmxcfs -lDelete the corosync configuration files:
rm /etc/pve/corosync.conf
rm -r /etc/corosync/*Start the file system again as a normal service:
killall pmxcfs
systemctl start pve-clusterThe node is now separated from the cluster.
Deleted it from any remaining node of the cluster if it is already a node of cluster
pvecm delnode oldnodeIf the command fails due to a loss of quorum in the remaining node, you can set the expected votes to 1 as a workaround:
pvecm expected 1And then repeat the pvecm delnode command.
This ensures that the node can be added to another cluster again without problems.
rm /var/lib/corosync/*
Remove /etc/pve/nodes/<node_name> from other nodes.
Remove ssh key from /etc/pve/priv/authorized_keys file