arm64 docker image?

[spinnaker1]

Hello,

is it possible to provide a multi-architecture docker image. I'm looking for a docker image for arm64 architecture of geoserver.

Best regards,
Martin

[derhuerst]

Just jumping in here with some pointers to what needs to be done, but don't have the time to do the work...

Currently, the build script has support for 3 versions of Docker (18, 19, 20):

docker-geoserver/custom_build.sh

Lines 144 to 218 in 999c0ba

	function build_with_data_dir() {
	local TAG=${1}
	local PULL_ENABLED=${2}
	DOCKER_VERSION="$(docker --version | grep "Docker version"| awk '{print $3}' | sed 's/,//')"
	case $DOCKER_VERSION in
	*"20"*)
	if [[ "${PULL_ENABLED}" == "pull" ]]; then
	DOCKER_BUILD_COMMAND="docker buildx build --pull"
	else
	DOCKER_BUILD_COMMAND="docker buildx build"
	fi;
	;;
	*"19"*)
	if [[ "${PULL_ENABLED}" == "pull" ]]; then
	DOCKER_BUILD_COMMAND="docker build --pull --no-cache"
	else
	DOCKER_BUILD_COMMAND="docker build --no-cache"
	fi;
	;;
	*"18"*)
	if [[ "${PULL_ENABLED}" == "pull" ]]; then
	DOCKER_BUILD_COMMAND="docker build --pull --no-cache"
	else
	DOCKER_BUILD_COMMAND="docker build --no-cache"
	fi;
	;;
	esac
	${DOCKER_BUILD_COMMAND} --build-arg GEOSERVER_WEBAPP_SRC=${GEOSERVER_ARTIFACT_DIRECTORY}/geoserver.war \
	--build-arg PLUG_IN_PATHS=$PLUGIN_ARTIFACT_DIRECTORY \
	--build-arg GEOSERVER_DATA_DIR_SRC=${DATADIR_ARTIFACT_DIRECTORY} \
	--build-arg UID=${USERID} --build-arg GID=${GROUPID} --build-arg UNAME=${UNAME} \
	--build-arg GIT_HASH=${GIT_HASH_COMMAND} \
	-t geosolutionsit/geoserver:"${TAG}-${GEOSERVER_VERSION}" \
	.
	}
	function build_without_data_dir() {
	local TAG=${1}
	local PULL_ENABLED=${2}
	DOCKER_VERSION="$(docker --version | grep "Docker version"| awk '{print $3}' | sed 's/,//')"
	case $DOCKER_VERSION in
	*"20"*)
	docker builder prune --all -f
	if [[ "${PULL_ENABLED}" == "pull" ]]; then
	DOCKER_BUILD_COMMAND="docker buildx build --pull"
	else
	DOCKER_BUILD_COMMAND="docker buildx build"
	fi;
	;;
	*"19"*)
	if [[ "${PULL_ENABLED}" == "pull" ]]; then
	DOCKER_BUILD_COMMAND="docker build --pull --no-cache"
	else
	DOCKER_BUILD_COMMAND="docker build --no-cache"
	fi;
	;;
	*"18"*)
	if [[ "${PULL_ENABLED}" == "pull" ]]; then
	DOCKER_BUILD_COMMAND="docker build --pull --no-cache"
	else
	DOCKER_BUILD_COMMAND="docker build --no-cache"
	fi;
	;;
	esac
	${DOCKER_BUILD_COMMAND} --build-arg GEOSERVER_WEBAPP_SRC=${GEOSERVER_ARTIFACT_DIRECTORY}/geoserver.war \
	--build-arg PLUG_IN_PATHS=$PLUGIN_ARTIFACT_DIRECTORY \
	--build-arg UID=${USERID} --build-arg GID=${GROUPID} --build-arg UNAME=${UNAME} \
	--build-arg GIT_HASH=${GIT_HASH_COMMAND} \
	-t geosolutionsit/geoserver:"${TAG}-${GEOSERVER_VERSION}" \
	.
	}

Moby BuildKit and docker buildx, which together allow seamless cross-platform builds, are enabled by default only as of Docker v23.

However, using the DOCKER_BUILDKIT=1 env var, one can opt into BuildKit even with earlier versions of Docker. It seems like, as of Docker Engine 18.06.0-ce, released on 2018-07-18, one can opt into experimental BuildKit.

TLDR: Theoretically, building linux/arm64 images should be possible even with the current setup, with the addition of --platform linux/amd64,linux/arm64 and DOCKER_BUILDKIT=1.

[randomorder]

Hi @spinnaker1

Thanks for reporting this. It would be nice to have arm64 builds as well. I have not looked into this yet

If you want to have a go at it, the builds are executed by the docker hub itself based on these hook scripts in the root of the repository
https://github.com/geosolutions-it/docker-geoserver/tree/master/hooks

@derhuerst the custom_build script is a helper script for end users to make it easier for them to create a custom image but is not used by the CI in docker hub to build and push the images

To add arm builds the build and push script need an update
here: https://github.com/geosolutions-it/docker-geoserver/blob/master/hooks/build#L28
and
here: https://github.com/geosolutions-it/docker-geoserver/blob/master/hooks/build#L51

with an extra build command and dedicated tag for ARM

and then push commands to be added here: https://github.com/geosolutions-it/docker-geoserver/blob/master/hooks/push#L5-L21 to push the new tags

Finally the test part with the new tags
https://github.com/geosolutions-it/docker-geoserver/blob/master/hooks/test#L3-L11

[derhuerst]

with an extra build command and dedicated tag for ARM

I think having one tag with both linux/amd64 & linux/arm64 support would provide more value. (But this should not be a problem if the Docker Hub build environment supports docker buildx, which I assume it does.)

With two separate tags, it is not possible to e.g. write architecture-agnostic Compose files.