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Docker multi-arch builds

Getting started

We uses docker buildx for building our docker packages. To build new image:

  1. Check is buildex driver was already started, and re-run it in case check was failed:
  if [[ ! $(docker ps | grep manticore_build) ]]; then
    docker buildx create  --name manticore_build --platform linux/amd64,linux/arm64
    docker buildx use manticore_build
    docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
  fi
  1. Next run build:
docker buildx build \
--build-arg DEV=1 \
--push \
--platform linux/arm64,linux/amd64 \
--tag manticoresearch/manticore:multi-arch-$BUILD_TAG .

Under hood

We have two arch for builds (amd & arm)

  • buildx command passed to Dockerfile additional argument TARGETPLATFORM which we used for deciding which arch we want to build linux/arm64 or linux/amd64
  • For dev builds we call apt install so switching between architectures happens automatically
  • For release builds we passed into build variables like DAEMON_URL, MCL_URL and EXTRA_URL. Very important that each of that links has _ARCH_ placeholder. Like: 
    https://repo.manticoreseatch.com/tarball_location/manticore_ARCH_.tgz
    This placeholder substitutes to arch during build process.

Troubleshooting

  • If you see failed to solve: rpc error: code = Unknown desc = failed to solve with frontend dockerfile.v0: failed to load LLB: runtime execution on platform linux/arm64 not supported run manually step one from getting started manual
  • If you encounter /bin/sh: Invalid ELF image for this architecture error. Run multiarch/qemu-user-static docker image and then build again