Sample Docker Compose configuration for "staging" web interface access with OpenVPN

docker-compose.yml

version: '3.4'
services:
  open-vpn:
    image: dperson/openvpn-client
    cap_add:
      - net_admin
    devices:
      - /dev/net/tun
    dns: 8.8.4.4  # NOTE not sure how to make this generic
    command: -d -a "$OVPN_USER;$OVPN_OTP"
    ports:
      - 80
    volumes:
      - "$OVPN_CONF_DIR:/vpn"
  some.internal-web.app:
    depends_on:
      - open-vpn
    image: nginx
    network_mode: service:open-vpn
    volumes:
      - ./nginx/conf.d/default.conf:/etc/nginx/conf.d/default.conf:ro