MULTI ARCHITECTURE CONTAINER IMAGES

INSTALL DOCKER

sudo apt update

sudo apt -y install docker.io

sudo adduser $USER docker
sudo su - $USER

INSTALL BUILDX DOCKER PLUGIN

mkdir -p $HOME/.docker/cli-plugins

BUILDX_RELESES="https://github.com/docker/buildx/releases"
BUILDX_VERSION=$(curl -fsL $BUILDX_RELESES | grep -m 1 -Eo 'v[0-9]+\.[0-9]+\.[0-9]*')

curl -fsSL $BUILDX_RELESES/download/$BUILDX_VERSION/buildx-$BUILDX_VERSION.linux-amd64 \
  -o $HOME/.docker/cli-plugins/docker-buildx

chmod +x $HOME/.docker/cli-plugins/docker-buildx

CHECK DOCKER PLUGINS

docker info

LOCAL REGISTRY

docker run -d --rm --name registry -p 5000:5000 registry:2

IMAGE BUILDER

docker buildx create --name image-builder --use \
  --driver docker-container \
  --driver-opt network=host

DOCKERFILE

cat <<'EOF'> Dockerfile 
FROM nginx:stable
RUN nginx -v
HEALTHCHECK --start-period=1s --timeout=10s --interval=10s \
  CMD curl -fsSL -H 'User-Agent: HealthCheck' http://127.0.0.1:80
EOF

PUSH TO DOCKER REGISTRY WITH BUILDX

docker buildx build --platform=linux/amd64,linux/arm64/v8 --pull --push \
  --tag 127.0.0.1:5000/my-docker-image:v1 \
  --progress=plain .

CHECK MULTI ARCHITECTURE

docker pull --platform arm64 127.0.0.1:5000/my-docker-image:v1

docker inspect 127.0.0.1:5000/my-docker-image:v1 | grep Architecture

docker pull --platform amd64 127.0.0.1:5000/my-docker-image:v1

docker inspect 127.0.0.1:5000/my-docker-image:v1 | grep Architecture

TEST

docker run -it --rm 127.0.0.1:5000/my-docker-image:v1

PUSH TO OCI TAR WITH BUILDX

docker buildx build --platform=linux/amd64,linux/arm64/v8 --pull \
  -o type=oci,dest=- \
  --progress=plain . > my-oci-image.tar

SKOPEO ( Ubuntu 22.04 )

sudo apt -y install jq skopeo

skopeo inspect --raw oci-archive:my-oci-image.tar | jq

skopeo inspect oci-archive:my-oci-image.tar --override-arch=amd64 | jq

skopeo inspect oci-archive:my-oci-image.tar --override-arch=arm64 | jq

CONVERT OCI IMAGE TO DOCKER IMAGE WITH SKOPEO

skopeo copy oci-archive:my-oci-image.tar \
  docker-archive:my-docker-image-amd64.tar \
  --override-arch=amd64

skopeo copy oci-archive:my-oci-image.tar \
  docker-archive:my-docker-image-arm64.tar \
  --override-arch=arm64

LOAD AND TAG AMD64 IMAGE

docker load -i my-docker-image-amd64.tar | \
  awk '{print $NF}' | \
  xargs -i docker tag {} my-docker-image:v1

LOAD AND TAG ARM64 IMAGE

docker load -i my-docker-image-arm64.tar | \
  awk '{print $NF}' | \
  xargs -i docker tag {} my-docker-image:v1

TEST

docker run -it --rm my-docker-image:v1

PUSH TO DOCKER REGISTRY WITH SKOPEO

skopeo copy oci-archive:my-oci-image.tar \
  docker://127.0.0.1:5000/my-docker-image:v1 \
  --dest-tls-verify=false \
  --all

PUSH TAG AMD64 TO DOCKER REGISTRY WITH SKOPEO

skopeo copy oci-archive:my-oci-image.tar \
  docker://127.0.0.1:5000/my-docker-image:v1-amd4 \
  --dest-tls-verify=false \
  --override-arch=amd64

PUSH TAG ARM64 TO DOCKER REGISTRY WITH SKOPEO

skopeo copy oci-archive:my-oci-image.tar \
  docker://127.0.0.1:5000/my-docker-image:v1-arm64 \
  --dest-tls-verify=false \
  --override-arch=arm64

docker pull 127.0.0.1:5000/my-docker-image:v1

docker inspect 127.0.0.1:5000/my-docker-image:v1

TEST

docker run -d --rm --name nginx 127.0.0.1:5000/my-docker-image:v1