If you have been under a rock (like I was for a while!), Docker is a container technology and containers are very cool. Containers sparked my interest in the same way that virtualization did the first time I saw it. I really regret not getting into it sooner but better late than never. Seriously if you haven’t played with containers at all try it on a local system, VM, or use this really nifty site http://training.play-with-docker.com/