Reverse Proxy Configuration in apache

                 Details required to set up Subsonic on centos Server. The problem with Subsonic is that it runs on Tomcat on a non-standard port. The rest of my web applications run in Apache on port 80. Therefore, it would be nice if instead of having to go to http://athos.zacintosh.com:8180/subsonic/, I could simply go to http://athos.zacintosh.com/subsonic/. The solution is called a reverse proxy. Reverse proxies can do things like load balance between multiple web servers or simply make resources on an internal web server available externally. In this case, I am using a reverse proxy to make a web application available on a different port available on the standard port 80.

 1)       Install the required rpm

            # yum install httpd

2)       Enable the proxy related modules in the httpd,conf file

            # vi /etc/httpd/conf/httpd.conf

LoadModule  proxy_module      modules/mod_proxy.so

LoadModule  proxy_http_module modules/mod_proxy_http.so

3)       Add the below entries to the http configuration file.

                        # vi /etc/httpd/conf/httpd.conf

            <IfModule mod_proxy.c>

            ProxyRequests Off

            <Proxy *>

            Order deny,allow

            Allow from all

            </Proxy>

            ProxyPreserveHost On

            ProxyVia On

            SSLProxyEngine on

            ProxyPass /webdav http://ServerIP:8080/subsonic 

            ProxyPassReverse /webdav http://ServerIP:8080/subsonic

 

            </IfModule>

Note: In the above sample all the request comes to /subsonic URL redirect to the another tomcat server. For example Apache server IP is 10.0.0.1 and the tomcat server IP is 10.0.0.2, then the request like http://10.0.0.2:8080/subsonic will be redirect to http://10.0.0.2:8080/subsonic

4)       To enable logging for the reverse proxy, add the below lines in the configuration file

            # vi /etc/httpd/conf/httpd.conf

            <IfModule mod_proxy.c>

            CustomLog logs/access_proxy.log combined

            ErrorLog logs/error_proxy.log

            </IfModule>

5)       Restart the httpd service

                        # /etc/init.d/httpd restart