Update page 'Installation'

Installation.md

@@ -23,4 +23,11 @@ Quick install:<br/>
 ```nlvmi createdb```<br/>
 ```chown nobody:root /etc/nlvmi```  -in this case we assume php is running as user nobody<br/>
 
+If there are nodes that should get managed by this master server, then the following is also needed:<br/>
+```nlvmi createkey```<br/>
+```su nlvmi```<br/>
+```ssh-keygen``` -without a password<br/>
+
+
+**KVM node**<br/>