WSL2 - docker buildx

commands

# start docker - this is a helper script created to start docker as wsl2 doesn't use systemd
docker-start

ping github.com  
# why a ping here? emperiically I've determined this has to occur
# otherwise for me the docker daemon messes up dns.
# don't know why, ymmv

wget https://gist.githubusercontent.com/ArturKlauser/0f0293c62f5626df0261ac994d8a46af/raw/d5863dfc22e6d65fd912c9ec760dcdc86ea320cc/check-qemu-binfmt.sh
chmod +x check-qemu-binfmt.sh
./check-qemu-binfmt.sh

# output here will indicate that 
OK: docker 20.10.17 supports buildx experimental feature.
OK: kernel 5.10.102.1-microsoft-standard-WSL2 has binfmt_misc fix-binary (F) support.
OK: /proc/sys/fs/binfmt_misc is mounted
OK: update-binfmts 2.2.0 has fix-binary (F) support.
OK: QEMU installed
ERROR: QEMU not registered in binfmt_misc.

# mis this step out and odd things happen when trying to compile arm on amd64
docker run --rm --privileged multiarch/qemu-user-static --reset -p yes

./check-qemu-binfmt.sh
OK: docker 20.10.17 supports buildx experimental feature.
OK: kernel 5.10.102.1-microsoft-standard-WSL2 has binfmt_misc fix-binary (F) support.
OK: /proc/sys/fs/binfmt_misc is mounted
OK: update-binfmts 2.2.0 has fix-binary (F) support.
OK: QEMU registered in binfmt_misc with flags F (F is required).
Host looks good for docker buildx multi-architecture support.

docker buildx create --use --platform linux/amd64 --platform linux/arm64
docker buildx build --platform linux/arm64 -f Dockerfile2 .
docker buildx build --platform linux/amd64 -f Dockerfile2 .
              

docker-start

#!/bin/bash
DOCKER_DISTRO="Ubuntu"
DOCKER_DIR=/mnt/wsl/shared-docker
DOCKER_SOCK="$DOCKER_DIR/docker.sock"
export DOCKER_HOST="unix://$DOCKER_SOCK"
if [ ! -S "$DOCKER_SOCK" ]; then
    mkdir -pm o=,ug=rwx "$DOCKER_DIR"
    chgrp docker "$DOCKER_DIR"
    /mnt/c/Windows/System32/wsl.exe -d $DOCKER_DISTRO sh -c "nohup sudo -b dockerd < /dev/null > $DOCKER_DIR/dockerd.log 2>&1"
fi

links.md

https://chrisrichardson.net/post/microservices/2022/01/16/build-multi-arch-docker-images-locally.html