$ cat Projects/qbittorrent/docker-compose.yml 
version: "2.1"
services:
  qbittorrent:
    image: lscr.io/linuxserver/qbittorrent:latest
    container_name: qbittorrent
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Europe/Berlin
      - WEBUI_PORT=8081
    volumes:
      - /path/to/appdata/config:/config
      - /home/username/Downloads/Torrents:/downloads
    ports:
      - 8081:8081
      - 6881:6881
      - 6881:6881/udp
    restart: unless-stopped

The whole server is running under the VPN.