When containers are working they are amazing and make running your code across different environments seamless...

However, when something goes wrong, the additional layers of abstraction can make debugging them difficult.

Here are three techniques you can use to debug them:

1) Override the entrypoint at runtime and exec into the container
2) Copy files into or out of the container for inspection/comparison
3) Run a remote debugger inside the container and attach to it over the network

I created a video walking through how to use these three techniques:

Leave your own tips in the comments!