https://medium.com/@pimterry/5-ways-to-debug-an-exploding-docker-container-4f729e2c0aa8

Sometimes things crash when they’re running inside a Docker container though, and then all of a sudden it can get much more difficult to work out why, or what the hell to do next. Docker’s great, but it’s an extra layer of complexity that means you can’t always easily poke your app up close any more, and that can really hinder debugging.