jenkins-docker

Build a Docker image using Jenkins pipeline and push it into Docker registry. This jenkins-docker image is built from Jenkins official image, install Docker, and give access to user jenkins build images.

Get the image from Docker Hub: https://hub.docker.com/r/joglomedia/jenkins-docker

Running Jenkins with Docker from Host

Start your jenkins-docker container by running this command:

docker container run --name jenkins-docker -p 8080:8080 joglomedia/jenkins-docker:lts

To run Jenkins build from host, you need to mount the Docker socket to the container. Add the volume parameter to your docker run command:

-v /var/run/docker.sock:/var/run/docker.sock:rw

In order to make the Docker inside your container able to communicate with the host Docker daemon, you should set the Docker group ID similar to the group ID of your host Docker daemon.

-e DOCKER_HOST_GID=YOUR_DOCKER_HOST_GID

You can try the following command to get the host Docker group ID:

getent group docker | cut -d: -f3

Assign the group ID to the DOCKER_HOST_GID environment variable, so you can pass it to the docker container run command.

DOCKER_HOST_GID=$(getent group docker | cut -d: -f3)

You also can configure a volume for Jenkins home. Use a directory for which you have permission.

JENKINS_HOME="${HOME}/jenkins_home"
mkdir -p ${JENKINS_HOME}

Change ownership required for Linux, ignore this line for Mac or Windows.

chown 1000:1000 ${JENKINS_HOME}

Finally, initialize jenkins-docker container as below:

docker container run --name jenkins-docker \
-p 8080:8080 -p 50000:50000 \
-e DOCKER_HOST_GID=${DOCKER_HOST_GID} \
-v /var/run/docker.sock:/var/run/docker.sock:rw \
-v ${JENKINS_HOME}:/var/jenkins_home \
joglomedia/jenkins-docker:lts

For running container in the background add a -d or --detach parameter to the Docker's container run command above.

Complete Jenkins Startup Wizard

After initializing the Jenkins container, complete the Jenkins startup wizard and install additional plugins (Locale & Blueocean). Your Jenkins web administration should be accessible from here:

http://YOUR-IP-ADDRESS:8080/

If you're asked for administrator password, you can get the password from inside container by executing the following command:

docker exec -it jenkins-docker cat /var/jenkins_home/secrets/initialAdminPassword

Install Additional Jenkins Plugins

All additional plugins listed in jenkins-home/plugins.txt file.

SECURITY PRECAUTION

The jenkins-docker image build with Docker out of Docker (DooD) approach for Jenkins CI/CD system. There is one known potential issue surrounding the DooD approach:

One potential issue of “Docker-out-of-Docker” approach is one can access the outer Docker container from the inner container through “/var/run/docker.sock”. In the context of containerized Jenkins system, the outer Docker container is usually Jenkins master with sensitive information. The inside Docker containers are usually Jenkins slaves that are subject to running all kinds of code which might be malicious. This means that a containerized Jenkins system can be easily compromised if there is no limit on what’s running in Jenkins slaves. ( Read more )

This image intended for personal use only, it is not for publicly available service. Use it at your own risk!

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