Maven Docker in Docker

An official Maven Debian + Docker + CERN CA certificates image to perform Docker-in-Docker builds on CERN Gitlab.

The image build is provided :

• As a baseline image, with default build arguments hard-coded in the provided Dockerfile. Consult the Dockerfile to know the current configuration.
• As a Maven-enabled image with support for gitflow conventions, branching, parameters and releases (thanks to the maven-dockerfile-plugin).

Important Note : The Gitlab CI only performs a baseline build in the master branch. The baseline is used to rebuild all other images so pick a sensible default.

How to update the baseline

Simply update the Dockerfile build arguments' default values, and commit to the master branch. NOTE : The baseline is used to rebuild all other images so pick a sensible default.

How to provide alternate images

Using gitflow, you can create a new support branch, it will automatically be picked up and deployed as a new docker image.

E.g., to create a new support branch for Maven 3.5.3, Docker 19.3.0 and Jdk11, simply execute :

git flow support start 3.5.3-19.3.0-jdk11 master

To name your support branch, please follow the convention <maven-version>-<docker-client-version>-<jdk-version> (with or without the SNAPSHOT suffix).

For instance :

• 3.5.3-19.0.3-jdk8
• 3.6.0-19.0.3.2-jdk11