coreos-cloud-config

gistfile1.txt

#cloud-config

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

        [Socket]
        ListenStream=0.0.0.0:2375
        BindIPv6Only=both
        Service=docker.service

        [Install]
        WantedBy=sockets.target
    - name: etcd.service
      command: start
    - name: fleet.service
      command: start

write_files:
  - path: /etc/systemd/system/docker.service.d/50-insecure-registry.conf
    content: |
        [Service]
        Environment='DOCKER_OPTS=--insecure-registry="somehost.com:5000"'