Blue-Green Deployment on Tomcat

## Background

A quick summary of blue-green deployment or AB deployment is that it allows us to update the website and our webapps without having down time. We maintain two nodes (blue and green) that run the web application. Most of the time, users should be hitting only one of the nodes. When we update and place a new version, the server should redirect all future traffic into the new node while maintaining sessions for the old node.
## Objective

Research and implement a method to have blue-green continuous deployment with our current hosting capabilities.