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This guide is assuming that you already have basic knowledge of Docker and Docker is up and running on your host machine. We are going to use Docker to configure Jenkins and Tomcat to achieve Continuous Integration/Continuous Deployment. We will install and set up Tomcat and Jenkins using Docker, and thereafter we will create a Jenkins Job to deploy your Java application over the Tomcat server. Jenkins is running Jenkins on port: 8080; Tomcat is running on port 8888; Jenkins will install all the necessary plugins.