Ejemplo de docker-compose corriendo rtorrent y samba, usando el driver macvlan

docker-compose-macvlan.yaml

## docker-compose usando driver macvlan
## by PeladoNerd https://youtu.be/eoFxMaeB9H4

version: "2"

services:

  samba:
    image: dperson/samba:rpi
    restart: always
    command: '-u "pi;password" -s "media;/media;yes;no" -s "downloads;/downloads;yes;no"'
    stdin_open: true
    tty: true
    ports:
      - 139:130
      - 445:445
    volumes:
      - /usr/share/zoneinfo/America/Argentina/Mendoza:/etc/localtime
      - /home/pi/media:/media
      - /home/pi/downloads:/downloads
    networks:
      lan:
        ipv4_address: 192.168.0.6


  rtorrent:
    image: pablokbs/rutorrent-armhf
    ports:
      - 80:80
      - 51413:51413
      - 6881:6881/udp
    volumes:
      - /home/pi/torrents-config/rtorrent:/config/rtorrent
      - /home/pi/downloads:/downloads
    restart: always
    networks:
      lan:
        ipv4_address: 192.168.0.5

networks:
  lan:
    driver: macvlan
    driver_opts:
      parent: eth0
    ipam:
      config:
        - subnet: "192.168.0.0/24"
          gateway: "192.168.0.1"

why some lines have the '-' symbol and other no i.e. subnet and gateway