Remember that Docker does cache intermediary builds (each Dockerfile line being a build) so when you are developing, avoid editing any existing lines and then combine it back together when you get it working.

Deployment of Docker is gross, but I think that’s because that space IMO is very immature.

From my experience, when something has a poor interface (Backbone.js, AngularJS, UMD, etc.) I avoid learning it because I know something is going to replace it. Kubernetes is currently squarely in that boat as far as I am concerned.