What does docker container exit status 255 mean?

Question

The doc mentions

You can use a filter to locate containers that exited with status of 137 meaning a SIGKILL(9) killed them

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Answer 1

If you see that on a docker ps, showing a container with a status "Exited (255)", that means its main entrpypoint/command process stopped with that status.

And 255 simply means "there was an error", but does not tell you much beside that.