...

The Tomcat Web container provides a native clustering solution that can be configured through Geronimo using gbean definitions within config.xml or your deployment descriptors . This document will go through the available GBeans and how to configure them for clustering in a Geronimo server with a tomcat web container.
A cluster configuration should be considered when you want to improve the scalability and availability of your Web application. The following sections provide detailed instructions on how to set up your cluster nodes and how to deploy your applications with tomcat clustering enabled.

Setting up a clustering environment

...