Setup Jellyfin with DLNA

Setup Jellyfin with docker and enable DLNA

Docker compose file

name: services
services:
  jellyfin:
    image: jellyfin/jellyfin
    container_name: jellyfin
    user: 1000:1000
    ports:
      - 8096:8096         # HTTP
      - 8920:8920         # HTTPS
      - 1900:1900/udp     # auto-discovery
      - 7359:7359/udp     # auto-discovery
    network_mode: "host"  # this is critical to allow DLNA
    volumes:
      - /opt/docker/jellyfin/config:/config
      - /opt/docker/jellyfin/cache:/cache
      - type: bind
        source: /opt/music
        target: /media
    restart: 'unless-stopped'
    environment:
      - JELLYFIN_PublishedServerUrl=http://music.mydomain.com
    extra_hosts:
      - 'host.docker.internal:host-gateway'

The easiest way to ensure that it works with DLNA is just to use host network mode as highlighted above.