When installing Docker by hand on CentOS 7 - or if puppeting the installation of Docker in puppet 3...
From The Docker.com website, do this as root or with sudo, on a CentOS 7 box.
- yum install docker
- service docker start
- chkconfig docker on
- sudo docker images (to make sure centos is there)
- sudo docker pull centos (if it isn't)
- sudo docker run -i -t centos /bin/bash