> I disagree, the advantage of Docker is that you can slap an image together by doing essentially what you were doing - running a couple of apt install commands

> I disagree, the advantage of Docker is that you can slap an image together by doing essentially what you were doing - running a couple of apt install commands, pip install -r requirements.txt, copy a few files and it's done. IMO that is the problem with Docker. People think that Docker somehow does anything for dependency management. It is an illusion because when you make or move a project into Docker you are essentially starting a new project, and new projects do not have dependency management problems. In a couple of years as people start upgrading components in their Docker-hosted apps dependency management and version conflict problems are going to appear, and will now be harder to resolve because image layering adds many possible failure points (not just at each layer, but also interactions between layers). Docker is a convenient way to deploy Linux containers, but IMO it is a ticking time bomb when it comes to dependency management.