We need to configure the Tomcat server and then deploy our application on top it.

When we create a Virtual Machine (VM) to distribute our application in, we need to install a guest operation system, then install the software we need to run our application, for example Tomcat. So what is the difference from that other thing they thought us about before to run multiple application on a single host? They called it ‘virtualization’ of application(s) via ‘Virtual Machine’ images? Well, in this regard Docker containers are the next generation of that exact idea. The official description of Docker… but what is a ‘container’ then? Well, in essence it is a ‘packaged’ application build from a ‘blue print’ image that run on top of the docker engine while providing us all the functionality it would if manually installed. Docker is a platform for developers and sysadmins to develop, deploy, and run applications with containers.