My team as well has fixed a lot of flaky tests by reducing the number of places we use docker. It's the most finicky part of our infrastructure. I always wonder what it would be like if comments were tagged with the technologies in use by the commenter; would we find that the strongest proponents of docker are working in stacks that have a poorer isolation/deployment story? I remember trying to package Ruby apps and thinking "huh, this is a pain." If that was the world I was in, I can see why shipping an image of my OS is a lifesaver.
Yes, that's a good point. I have two Rails sites (side projects) and I've never worked with something so finicky. Something always breaks, and after every OS update I habe troubles getting my dev environment back up. I can see the appeal for Docker there.
But with all my other stuff this is really not an issue. I have a few small services written in Python, and some old stuff in PHP, and that stuff is so easy to run and deploy on pretty much any OS, and adding Docker would just add pointless complexity.
