Jenkins in docker with access to host docker

Question

I have a workflow as follows for publishing webapps to my dev server. The server has a single docker host and I\'m using docker-compose for managing containers.

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Answer 1

My previous answer was more generic, telling how you can modify the GID inside the container at runtime. Now, by coincidence, someone from my close colleagues asked for a jenkins instance that can do docker development so I created this:

FROM bdruemen/jenkins-uid-from-volume
RUN apt-get -yqq update && apt-get -yqq install docker.io && usermod -g docker jenkins
VOLUME /var/run/docker.sock
ENTRYPOINT groupmod -g $(stat -c "%g" /var/run/docker.sock) docker && usermod -u $(stat -c "%u" /var/jenkins_home) jenkins && gosu jenkins /bin/tini -- /usr/local/bin/jenkins.sh

(The parent Dockerfile is the same one I have described in my answer to: Changing the user's uid in a pre-build docker container (jenkins))

To use it, mount both, jenkins_home and docker.sock.

docker run -d /home/jenkins:/var/jenkins_home -v /var/run/docker.sock:/var/run/docker.sock 

The jenkins process in the container will have the same UID as the mounted host directory. Assuming the docker socket is accessible to the docker group on the host, there is a group created in the container, also named docker, with the same GID.