Server Rename from a single deployemnt to distributed deployemnt

You don't necessary need a server rename for this scenario. You install a reverse proxy (e.g. IBM HTTP Server) on a machine that is accessible using the public URI of your environment. The reverse proxy hosts your public URI and delegates to the applications. The Current machine DNS hostname is changed in this process. That does not matter, because the reverse caching proxy redirects the calls. Once that is done, you can move applications on the machine that hosts the caching proxy if you want to. You have to use a different port for the application server. Again that does not matter, because the reverse proxy redirects the calls.