So I have figured out how to use virtualhost, proxypass and proxypassreverse. So far, so good.

The problem I'm experiencing is this:

I have a reverse proxy server running apache (123.123.123.123)

Behind this proxy server I have a http server running apache (124.124.124.124).
This http server has multiple sites (virtualhost), it's only reachable via the proxy server.

If i run a nslookup on www.somedomain.com I get 123.123.123.123 (Not really but you understand what I mean)

I put my proxy to have the IP 123.123.123.123, so far so good. The requests come in to the proxy server.

I want my http server to be named 124.124.124.124.
In the http server I wish to set up my virtualhosts like this:
(simplified but you get it, right?)

<VirtualHost 124.124.124.124>
ServerName www.somedomain.com
Documentroot /home/somedomain.com
</VirtualHost>

How do I get my proxy to grab the data from the http server?

If I do like this I will only make another request to my proxy server.

<VirtualHost www.somedomain.com>
ServerName www.somedomain.com
PROXYRequests Off
ProxyPass / http://www.somedomain.com/
ProxyPassReverse / http://www.somedomain.com/
</VirtualHost>

If I do like this, only the first page in the httpd.conf in my http server will work.

<VirtualHost www.somedomain.com>
ServerName www.somedomain.com
PROXYRequests Off
ProxyPass / http://124.124.124.124/
ProxyPassReverse / http://124.124.124.124/
</VirtualHost>

So how do I do it?

Do I need to setup a different DNS server for the proxy server? I would hate that. Perhaps use hosts-file in proxy. Or maybe I can use sub-domains?

All of the above are solutions that I would really hate to use, so is there a "best-practise" here?

Hi,

You should setup the vhosts on the reverse proxy and use something like the following for each one of them:
I assume that the DocumentRoot of each vhost in 124.124.124.124 is a subdirectory (like somedomain.com in the example above) under the DocumentRoot of the _default_ server.

Regards