The scenario:

You have a website you need to move to a new web server on a new IP address. You intend to keep the domain and all URLs the same.

By utilising the Apache module mod_proxy we can make sure that all requests are sent to the correct server, despite any cached DNS entries which are pointing to the old IP. Whilst this isn’t too much of a problem for static web-sites, for modern, database driven sites it is vital that all data is written to the correct location. One particular benefit feature of this approach is that you can move just a single VirtualHost, where other approaches expect you to be moving everything hosted on that server.
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apache, howto, Linux