Registries and Publishing

Part of the Docker course

Every image you have built so far exists in exactly one place: the Docker daemon on your machine. That is fine while you are the only one running it, and it is the exact point where "it works on my machine" becomes a real problem, because there is no way for anyone else's machine to get it. A teammate cannot run your image. Neither can a server. Neither can a CI job.

A registry is the shared storage that fixes this. You push an image to it, someone else pulls it, and the bytes they get are the bytes you tested. This lesson is that round trip. ...