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Docker out of Docker Jenkins Slave

Having Jenkins Slaves with the ability to use Docker is mandatory in a well designed CI/CD environment.

This repository is just an example of how to achieve it using the Docker out of Docker concept (or "sibling") as explained at Using Docker-in-Docker for your CI or testing environment? Think twice article, without giving root access to the host.

The images of this repository are based on the jenkins/jnlp-slave official image from the Jenkins's Docker Hub account.

Quick Example:

$ docker build -t dood-jenkins-slave:$DOCKER_VERSION-$SLAVE_VERSION \
                       --build-arg DOCKER_VERSION=$DOCKER_VERSION \
                       --build-arg SLAVE_VERSION=$SLAVE_VERSION .

$ docker run --rm --env-file slave.env -v /var/run/docker.sock:/var/run/docker.sock \
                                  dood-jenkins-slave:$DOCKER_VERSION-$SLAVE_VERSION

slave.env must contain the environment variables required: JENKINS_URL, JENKINS_AGENT_NAME, JENKINS_SECRET, JENKINS_AGENT_WORKDIR, JENKINS_TUNNEL.