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docker-multiarch-builder

Simple framework for building multi-arch images.

Preparing your build machine

Run following commands on a host only once:

$ sudo ./run-once.sh

This will download necessary docker CLI binaries, put them in path and register necessary binfmt_misc handlers.

Initializing your project

When you want to create your Docker project, run this first:

$ mkdir /usr/src/docker-project-name
$ ./init-repo.sh /usr/src/docker-project-name

This will download static qemu binaries into your project qemu/ directory, prepare a stub of your Dockerfile.cross, and provide a local copy of your build.sh and build.config that you should use to build your images.

Configuring build process

Build configuration is in build.config in your project directory. It has number of parameters:

  • REPO - name of your hub.docker.com repository. You should already be logged in and have write access to this repository.
  • IMAGE_NAME - image name that you would like to build. Probably your project name.
  • IMAGE_VERSION - leave empty for "latest"
  • DOCKER_CLI_PATH - path where docker CLI that supports manifest command is. You can leave it empty if you added it to path.
  • TARGET_ARCHES - list of target architectures you would like to build.

Naturally, you should also edit your Dockerfile.cross and put meaningful build instructions. Just make sure __CROSS_COPY is placed before any RUN.

Keep __BASEIMAGE_ARCH__, __CROSS_COPY and __QEMU_ARCH__ placeholder, as they are used to generate temporary Dockerfiles for each of the build architectures.

To actually build, tag images and push all of them + fat manifest to repository:

cd /usr/src/docker-project-name
./build.sh

(NOTE: You need to be logged in to the repository)