gistfile1.txt

#cloud-config

coreos:
  units:
    - name: docker-tcp.socket
      command: start
      enable: yes
      content: |
        [Unit]
        Description=Docker Socket for the API

        [Socket]
        ListenStream=2375
        BindIPv6Only=both
        Service=docker.service

        [Install]
        WantedBy=sockets.target
    - name: enable-docker-tcp.service
      command: start
      content: |
        [Unit]
        Description=Enable the Docker Socket for the API

        [Service]
        Type=oneshot
        ExecStart=/usr/bin/systemctl enable docker-tcp.socket