Alpine-Maven

Container for Alpine Linux + OpenJDK8 + Maven

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This image containerizes Maven, a build automation tool along with its OpenJDK8 dependencies.

Current installed version is 3.5.4

Based on Alpine Linux from my alpine-openjdk8 image with the s6 init system overlayed in it.

The image is tagged respectively for the following architectures,

• armhf
• x86_64 (retagged as the latest )

armhf builds have embedded binfmt_misc support and contain the qemu-user-static binary that allows for running it also inside an x64 environment that has it.

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Get the Image

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Pull the image for your architecture it's already available from Docker Hub.

# make pull
docker pull woahbase/alpine-maven:x86_64

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Run

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If you want to run images for other architectures, you will need to have binfmt support configured for your machine. multiarch, has made it easy for us containing that into a docker container.

# make regbinfmt
docker run --rm --privileged multiarch/qemu-user-static:register --reset

Without the above, you can still run the image that is made for your architecture, e.g for an x86_64 machine..

This images already has a user alpine configured to drop privileges to the passed PUID/PGID which is ideal if its used to run in non-root mode. That way you only need to specify the values at runtime and pass the -u alpine if need be. (run id in your terminal to see your own PUID/PGID values.)

Before you run..

• Mount the project directory (where pom.xml is) at /home/alpine/project. Mounts PWD by default.

• Maven runs under the user alpine.

• Optionally, if you want to cache the jars/packages downloaded by maven, so that they're downloaded once, and reused in later builds, bind mount the user home directory (/home/alpine) somewhere in your local. The packages get cached inside the /home/alpine/.m2 folder.

Running make gets a shell.

# make
docker run --rm -it \
  --name docker_maven --hostname maven \
  -e PGID=1000 -e PUID=1000 \
  -c 512 -m 1024m \
  -v $PWD:/home/alpine/project \
  -v /etc/localtime:/etc/localtime:ro \
  -v /etc/hosts:/etc/hosts:ro \
  --entrypoint /bin/bash \
  woahbase/alpine-maven:x86_64

The usual maven stuff. e.g clean pack a project with

docker run --rm -it \
  --name docker_maven --hostname maven \
  -e PGID=1000 -e PUID=1000 \
  -c 512 -m 1024m \
  -v $PWD:/home/alpine/project \
  -v /etc/localtime:/etc/localtime:ro \
  -v /etc/hosts:/etc/hosts:ro \
  woahbase/alpine-maven:x86_64 \
  clean package

Stop the container with a timeout, (defaults to 2 seconds)

# make stop
docker stop -t 2 docker_maven

Removes the container, (always better to stop it first and -f only when needed most)

# make rm
docker rm -f docker_maven

Restart the container with

# make restart
docker restart docker_maven

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Shell access

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Get a shell inside a already running container,

# make shell
docker exec -it docker_maven /bin/bash

set user or login as root,

# make rshell
docker exec -u root -it docker_maven /bin/bash

To check logs of a running container in real time

# make logs
docker logs -f docker_maven

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Development

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If you have the repository access, you can clone and build the image yourself for your own system, and can push after.

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Setup

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Before you clone the repo, you must have Git, GNU make, and Docker setup on the machine.

git clone https://github.com/woahbase/alpine-maven
cd alpine-maven

You can always skip installing make but you will have to type the whole docker commands then instead of using the sweet make targets.

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Build

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You need to have binfmt_misc configured in your system to be able to build images for other architectures.

Otherwise to locally build the image for your system. [ARCH defaults to x86_64, need to be explicit when building for other architectures.]

# make ARCH=x86_64 build
# sets up binfmt if not x86_64
docker build --rm --compress --force-rm \
  --no-cache=true --pull \
  -f ./Dockerfile_x86_64 \
  --build-arg ARCH=x86_64 \
  --build-arg DOCKERSRC=alpine-openjdk8 \
  --build-arg PGID=1000 \
  --build-arg PUID=1000 \
  --build-arg USERNAME=woahbase \
  --build-arg MAVEN_VERSION=3.5.4 \
  -t woahbase/alpine-maven:x86_64 \
  .

To check if its working..

# make ARCH=x86_64 test
docker run --rm -it \
  --name docker_maven --hostname maven \
  -e PGID=1000 -e PUID=1000 \
  woahbase/alpine-maven:x86_64 \
  -version

And finally, if you have push access,

# make ARCH=x86_64 push
docker push woahbase/alpine-maven:x86_64

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Maintenance

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Sources at Github. Built at Travis-CI.org (armhf / x64 builds). Images at Docker hub. Metadata at Microbadger.

Maintained by WOAHBase.