Setup sometime to perform Tomcat Clustering.

Let's just start with a basic setup of Two Tomcats.

First, let's set this up in DEMO, and test the application.

worker1 - tomcat1 (serves the application)
worker2 - tomcat2 (serves the application)
worker3 - balancer-tomcat (balances the load)


Once the DEMO works fine, we can bring the DEMO back to a single tomcat, and 
move this to PROD.

Advantage: We can get the benefit of High Availability application. In other 
words, we can seamlessly install fixes without bringing the server down.