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*[HTML]: Hyper Text Markup Language

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{{< note class="info" title="Info" >}} This is an info admonition. {{< /note >}}

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# main.py

def main():
    print("Hello world")

if __name__ == "__main__":
    main()

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Now onto a somewhat real example:

Notice the second FROM instruction? It tells Docker to start again from a new image, like at the beginning of a build, except that it will have access to the last layers of all the previous stages.

Then, the COPY --from is used to retrieve the built binary from the first stage.

In this extreme case, the final image weighs nothing more than the binary itself since scratch is a special empty image with no operating system.

Link to another section: link

🐍 Applying to Python & Poetry

Install the dependencies

Let's start with a basic Dockerfile with a single stage that will just install this blog's dependencies and run the project.¹

Basically a multi-stage build allows you to sequentially use multiple images in one Dockerfile and pass data between them.

This is especially useful for projects in statically compiled languages such as Go, in which the output is a completely standalone binary: you can use an image containing the Go toolchain to build your project and copy your binary to a barebones image to distribute it.

The source code is available on sourcehut. ↩︎

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