FROM jenkins:2.32.1

# install docker inside this container
USER root
    # Install Docker inside Jenkins
    RUN apt-get update
    RUN apt-get purge "docker.io*"
    RUN apt-get update
    RUN apt-get install -y apt-transport-https ca-certificates gnupg2
    RUN apt-key adv
       --keyserver hkp://ha.pool.sks-keyservers.net:80
       --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
    RUN echo "deb https://apt.dockerproject.org/repo debian-jessie main" > /etc/apt/sources.list.d/docker.list
    RUN apt-get update
    RUN apt-cache policy docker-engine
    RUN apt-get update
    RUN apt-get install -y docker-engine
    RUN gpasswd -a jenkins docker
    USER jenkins

root@1e0f4b325d58:/# sudo service docker start
mount: permission denied
rmdir: failed to remove ‘cpu’: Read-only file system
mount: permission denied
rmdir: failed to remove ‘cpuacct’: Read-only file system
mount: permission denied
rmdir: failed to remove ‘net_cls’: Read-only file system
mount: permission denied
rmdir: failed to remove ‘net_prio’: Read-only file system
/etc/init.d/docker: 96: ulimit: error setting limit (Operation not permitted)