Run Docker commands inside Jenkins Docker container

Introduction
If you want to initiate docker containers from within your jenkin containers,this is what you have to do:
  • In the Jenkins Dockerfile, add commands to get docker, docker-compose installed.
  • bind mount the docker socket.
    • And thats it! This is how the Dockerfile looks like:
    Jenkins Dockerfile 
    FROM jenkins/jenkins

# Docker install
USER root
RUN apt-get update && apt-get install -y \
       apt-transport-https \
       ca-certificates \
       curl \
       gnupg2 \
       software-properties-common \


RUN curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -
RUN apt-key fingerprint 0EBFCD88
RUN add-apt-repository \
       "deb [arch=amd64] https://download.docker.com/linux/debian \
       $(lsb_release -cs) \
       stable"

RUN curl -L https://github.com/docker/compose/releases/download/1.27.4/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose \
&& chmod +x /usr/local/bin/docker-compose

RUN apt-get update && apt-get install -y docker-ce-cli

USER jenkins
    Now to build the image:
    docker build -t jenkins-docker .
    To run the docker-image, including the volume mounts:
    docker run -d --group-add $(stat -c '%g' /var/run/docker.sock) \
-v /var/run/docker.sock:/var/run/docker.sock -p 8080:8080 -p 50000:50000 \
-v `pwd`/jenkins:/var/jenkins_home --log-opt max-size=50k   --log-opt max-file=5   --name jenkins -P jenkins-docker
    Here you can see docker.sock file has been mounted.Also, jenkins_home folder has been mounted so that you can persist the information regarding your pipeline/configuration/users etc.
    Dont forget to take backup of jenkins_home directory!
    I have uploaded a makefile and a similar Dockerfile on github.
    And thats it!

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    Tags:

    DockerJenkinsDevops

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    Run Docker commands inside Jenkins Docker container