Guide to Tomcat Clustering Apache Tomcat is a great performer on its own, but if you're expecting more traffic as your site expands, or are thinking about the best way to provide high availability, you'll be happy to know that Tomcat also shines in a clustered environment. With built-in support for both synchronous and asynchronous in-memory and external session replication, cluster segmentation, and compatibility with all common load balancing solutions, your Tomcat servers are ready for the cluster right out of the box. In this article, we'll show you how easy it is to set up a simple Tomcat cluster with load balancing and session replication. This simple step-by-step guide will walk you through every step of the process in plain English, from installing the load balancer, to configuring mod_jk, to enabling Tomcat's built-in session replication capabilities. Along the way, we'll point out common problem areas, to help you avoid configuration mistake...