Updated README

README.md

@@ -59,6 +59,12 @@ Login without polluting the _known hosts_ file:
 ssh virtualuser@ipAddress -o "StrictHostKeyChecking=no" -o "UserKnownHostsFile=/dev/null"
 ```
 
+Add an unique _hostname_ to each VM:
+
+```sh
+hostnamectl set-hostname unique-hname-101
+```
+
 And then launch this to install Rancher:
 
 ```sh