A Docker image based on arm32v6/alpine with a Python 3 environment and common packages pre-installed:

• python3
• py3-pip
• py3-numpy
• py3-pillow
• py3-psutil
• py3-yaml
• py3-paho-mqtt

• Docker (with the buildx plugin — included in Docker Desktop and Docker Engine 19.03+)
• A Linux/macOS host (Windows with WSL2 also works)

Because this image targets linux/arm/v6, cross-platform build support must be enabled on your host before building. Run once:

just setup

This will:

1. Download and install the docker buildx CLI plugin if not already present
2. Install QEMU ARM emulation handlers via tonistiigi/binfmt
3. Create (or switch to) a buildx builder instance named multiarch that supports multi-platform builds
4. Bootstrap and verify the builder is ready

Note: The just setup step requires a privileged container to install the QEMU binary formats. You only need to run it once per machine (or after a Docker restart that clears binfmt registrations).

just build

This builds the image for linux/arm/v6 and loads it into your local Docker image store.

just push

This builds and pushes the image directly to Docker Hub as mapitman/python-arm:latest. You must be logged in (docker login) with push access to that repository.