- name: docker.service
      drop-ins:
        - name: 50-networking.conf
          content: |
            [Service]
            EnvironmentFile=/etc/docker.env
            EnvironmentFile=/etc/skydns.env
            Environment="DOCKER_OPTS=--bip=${DOCKER_BRIDGE_IP}/24 --dns=${DOCKER_BRIDGE_IP} --dns-search=${SKYDNS_DOMAIN}"