Add 'removecluster-comm.txt'

removecluster-comm.txt

@@ -0,0 +1,13 @@
+Shut down the other nodes. This step is important to isolate the node from the rest of the cluster and avoid corosync or other services to copy back deleted files on the local node we're gonna act on.
+
+Remove corosync config to ensure the node is no longer part of the cluster:
+```bash
+rm /etc/pve/corosync.conf
+```
+
+Clean up the cluster configuration:
+```bash
+rm -rf /etc/corosync/*
+ls /etc/pve/nodes #show all nodes data in folders, delete the other nodes folders
+rm -rf /etc/pve/nodes/<other_node_name> #just to be sure to delete data of other nodes
+```