CODE EXAMPLE FOR SHELL

Run docker in docker

RUN apt-get update 
  && apt-get install apt-transport-https ca-certificates 
  && echo "deb https://apt.dockerproject.org/repo debian-jessie main" > /etc/apt/sources.list.d/docker.list 
  && apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D 
  && apt-get update 
  && apt-get install -y docker-engine