The Docker engine allows every value-adding software solution to be containerized, indexed, registered, and stocked. Docker is turning out to be a great tool for systematically developing, shipping, deploying, and running containers everywhere. While docker.io lets you upload your Docker creations to their registry for free, anything you upload there is publicly discoverable and accessible. Innovators and companies aren't keen on this and therefore, insist on for private Docker Hubs. In this chapter, we explained all the steps, syntaxes, and semantics for you in an easy-to-understand manner. We saw how to retrieve images to generate Docker containers and described how to push our images to the Docker registry in a secure manner in order to be found and used by authenticated developers. The authentication and authorization mechanisms, a major part of the whole process, have been explained in detail. Precisely speaking, this chapter is conceived and concretized as a guide for setting...