tomcat behind 2 apache http servers

Question

I have this architecture:

            http                   Ajp
[Apache A] -------> [Apache B] ----------> [Tomcat]

there is a way to configure [Apache B] to forward an ajp request in order to achive this:

             Ajp                  Ajp
[Apache A] -------> [Apache B] ----------> [Tomcat] 

???

many thanks in advance.

Answer 1

You need mod_proxy_ajp, which adds ajp support to mod_proxy.

Answer 2

You can setup a reverse proxy on Apache A, so that all requests for your app go to Apache B with a config like:

ProxyPass /myapp http://apacheb.domain.com/myapp
ProxyPassReverse /myapp http://apacheb.domiain.com/myapp

Then, using ModJK on Apache B, you set up a workers.properties file to define your tomcat servers and any load-balancing and connection parameters. In your vhost block, you set JKmounts to the tomcat server. So, if you have www.domain.com/myapp as a tomcat application, you would do

jkmount /myapp/* worker1

Where worker1 would be defined in the workers.properties file like:

worker.worker1.port=8009
worker.worker1.host=tomcat_host_name
worker.worker1.type=ajp13

So the request will come in to apache A, which will get proxied to B and then mod_jk'ed over to the tomcat server.