What is Docker? A beginner's guide to the mechanism that solves the 'it works on my machine' problem

It worked on my PC, but it doesn't work on another.Just a slight difference in Python version, libraries, or OS settings can ...
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I expected Docker to choke on my old Raspberry Pi, but Kiwix proved me wrong

I wasn’t sure Docker would work on my old Raspberry Pi — it did, and now I have big plans.