Cross Compiling Docker Images
a day ago
- Running Docker images across multiple CPU architectures (e.g., AMD64 to ARM) has traditionally been challenging but is now feasible.
- Docker CE 19.03+ includes buildx, a CLI plugin that enables building multi-architecture images using BuildKit.
- QEMU emulation is required to build ARM images on AMD64 machines, enabling cross-platform execution.
- To build a single ARM image on an AMD64 machine: enable QEMU, create a builder instance, and use buildx with the desired platform (e.g., linux/arm).
- For CI/CD pipelines, buildx can build and push images for multiple architectures (e.g., ARM64, ARM, AMD64) simultaneously, with a manifest ensuring the correct image is pulled on each architecture.