Although Docker images are not hard to build, (it is just a layers of tars with proper jsons) it is very nice to see such tools rise. Although I have a nice Kubernetes cluster, or any orchestrator, due to security reasons, I have to come up with a new VM with Docker installed and build it there, which really sucks. It is sad to see Docker did not implement this years ago although people wanted it a lot. They were busy deprecating the Swarm Whatever^TM for the 3rd time and not listening as usual.