0 Replies Latest reply on Feb 18, 2011 2:40 AM by Willem Noorduin

    jboss clustering and mod_proxy_balancer

    Willem Noorduin Newbie

      We are setting up a jboss-as 5.1+ cluster with two different JBoss-AS servers (jboss1 and jboss2) and setting up such that we can reach
      the application via a URL which is served in an Apache Webserver. Using mod_cluster, this runs smoothly. Because I am not really sure if
      I can persuade our production organization to go aboard with mod_cluster just yet, so I try to setup the next worst thing, a proxy_ajp setup.
      Here I define the following for my cluster:


      <Proxy balancer://testcluster/>
              BalancerMember ajp://jboss1:8009/application/ keepalive=On status=-H
              BalancerMember ajp://jboss2:8009/application/ keepalive=On status=-H
      </Proxy>

       

      and the following for the Virtual host:

       

      <VirtualHost *:80>
          ServerAdmin tweedledeel@tweedledum.com

          DocumentRoot /apps/data/www.application.nl/data
          ServerName www.application.nl

          ErrorLog logs/test-error_log
          CustomLog logs/test-access_log combined
          LogLevel debug

          ProxyPass /application balancer://testcluster/ stickysession=JSESSIONID|jsessionid


          <Location /balancer-manager>
              SetHandler balancer-manager
          </Location>

      </VirtualHost>


      and I deploy application.war to the two jboss-as servers jboss1 and jboss2 all goes well, and I can reach the application (which is a version of clustejsp by the way, consisting of HaJsp.jsp (the entry page) and ClearSession.jsp, which you can reach via a button on HaJsp.jsp) via the link:

       

      http://www.application.nl/application

       

      When I hit the ClearSession.jsp button, I get a 404 Not Found error. Upon inspection of the address bar in the brwoser, I see:

       

      http://www.application.nl/ClearSession.jsp

       

      Which is of course not there (http://www.application.nl/application/ClearSession.jsp is existing though). Strange thing is, that when I do the same
      thing with:

       

      http://www.application.nl/application/

       

      [Notice the trailing /]. the application works fine.

       

      Questions:

      Is it possible via an extra command or something else in the cluster configuration or in the Proxy statement to get this working (most reallife users can't deal with the extra /) ?


      I'd rather not rooting for mod_rewrite here now, but if someone has a working example, it would be welcomed also (I have tried several things, like:

       

          # Adding a trailing / if it is not there

          RewriteCond %{REQUEST_FILENAME} !-f

          RewriteCond %{REQUEST_URI} !\..+$

          RewriteCond %{REQUEST_URI} !/$

          RewriteRule (.*) http://poc.brpp.nl.post.tnt/$1/ [R=301,L]

          # End Adding a trailing / if it is not there

       

      but am always ending up with extra /'shes in the addressbar (something a reallife user is going to make a fuss about).

       

      My guess is that my Poxy statements are creating a cluster allright, but don't isolate an application totally (while doing things with the application inside the war, break out easily out of the context of the application.

       

      mod_cluster does an excellent job in application isolation, and in mod_jk you can just punch in the right JkMount command.