After you’ve removed a node from a Proxmox cluster, the node often still shows in the Proxmox GUI. The fix is quite simple – ssh into one of the remaining nodes in the cluster and run the following command:
rm -rf /etc/pve/nodes/<node-name-stuck-in-gui>Replace <node-name-stuck-in-gui> with the actual name of the node. If node6 was stuck in the GUI, you would run the following command:
rm -rf /etc/pve/nodes/node6