[UPHPU] Running Multiple Publicly Accessible Web Servers on a Single IP Address

[Richard K Miller]

On Aug 18, 2009, at 4:08 PM, Kirk Ouimet wrote:

> I have three separate web servers with three different internal IP  
> addresses
> on a network with only one public IP address. Each web server has  
> security
> restrictions such that I cannot just run all of my websites on a  
> single web
> server. All are running Apache.
>
> I want to setup subdomains that allow me to access each of the  
> different web
> servers remotely, all on port 80. E.g.,
>
> site1.domain.com
> site2.domain.com
> site3.domain.com
>
> Where all three of those domains resolve to my single public IP  
> address, but
> some type of service examines the request to see which subdomain is  
> being
> requested and pulls the data from the appropriate server.

Kirk, you could set your router/firewall to direct traffic from the  
external IP to the 1st web server, then use Apache's ProxyPass  
directive to handle requests for the 2nd and 3rd web servers. Server  
1's httpd.conf would look something like this:

<VirtualHost *:80>
	ServerName site1.domain.com
</VirtualHost>

<VirtualHost *:80>
	ServerName site2.domain.com
	ProxyPass / http://192.168.1.2/  # proxy requests to the 2nd web server
</VirtualHost>

<VirtualHost *:80>
	ServerName site3.domain.com
	ProxyPass / http://192.168.1.3/  # proxy requests to the 3rd web server
</VirtualHost>

Of course, server 1 has to be online for 2 and 3 to work. Perhaps a  
4th server would serve you better as a dedicated firewall/proxy.