Note: This version of the VDT (1.3.7) is no longer supported. Feel free to look through the documentation and install it, but we cannot guarantee support for it. The current stable release is 2.0.0.
We always run Apache in front of Tomcat. There are two reasons for this. First, we have a service that requires Apache (Clarens) and multiple services that require Tomcat (VOMS-Admin, jClarens, CEMon, and GUMS), and people would like all of them to be on the same port. Second, we use two different versions of Tomcat (Tomcat 4 for Clarens, and Tomcat 5 for the others). Over time, we expect services to migrate to newer version of Tomcat including Tomcat 5, Tomcat 5.5, and beyond. If we didn't run Apache in front on Tomcat, when a service migrated to a new version of Tomcat, the URL would change because it would be on a different port. Because we use Apache in front of Tomcat, the URLs stay constant