Tomcat supports multiple instances, and you should consider installing Tomcat so that a single binary runtime directory supports multiple instances as a means of adhering to security best practices.
While the documentation on multiple instances is in the RUNNNING.txt file at the root of the Tomcat binary distribution file hierarchy, many people aren’t necessarily aware of the feature or why you might use it. To provide some insight, let’s look at how this functionality works and provide some insight to the related best practice for security.