Python⇒Speed: Poetry vs. Docker caching: Fight!

Docker packaging is an exercise in shoving square pegs into round holes, over and over and over again.

Consider the Poetry packaging tool for Python. One of Poetry’s features can make Docker rebuilds slower, by breaking Docker’s caching.

And it’s not a bad feature, there’s nothing really wrong with it, it just—doesn’t fit.

Let’s see what the problem is, go over some workarounds—which have their own problems, obviously—and then briefly consider why everything about Docker packaging is always slightly broken.

Note: Outside the very specific topic under discussion, the Dockerfiles in this article are not examples of best practices, since the added complexity would obscure the main point of the article.

To ensure you’re writing secure, correct, fast Dockerfiles, consider my Quickstart guide, which includes a packaging process and 60+ best practices.

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