Capstone: Shipping a Stack

Part of the Docker course

Every lesson so far taught one thing against a container that printed a string. That is how you learn a directive and it hides the part that is actually hard, which is that a real application is several containers that have to find each other, start in the right order, keep their data, and end up somewhere a different machine can reach.

You are going to build that. A small Go HTTP API talking to Postgres, in a multi-stage image that is small and runs as a non-root user, wired together with Compose so the API waits for the database to be genuinely ready, then tagged and pushed so a fresh machine can run the whole thing with one command.