Identity

Unit (native): jellyfin.service
Config (native): /etc/jellyfin/ (system.xml, network.xml, encoding.xml, logging.json)
Config (Docker): /config volume — same XML files, path is inside the container
Data dir: /var/lib/jellyfin/ (native) or /config volume (Docker) — holds metadata cache, DB, plugins
Logs: journalctl -u jellyfin (native) or docker logs jellyfin (Docker), also /var/log/jellyfin/
Media dir: read-only mount recommended; Jellyfin only needs read access to media files
Ports: 8096/tcp (HTTP), 8920/tcp (HTTPS optional), 7359/udp (auto-discovery), 1900/udp (DLNA/uPnP)
User (native): jellyfin — media files must be readable by this user
Distro install: apt install jellyfin / dnf install jellyfin (after adding Jellyfin repo)

Key Operations

Operation	Command
Service status	`systemctl status jellyfin`
Start / stop / restart	`sudo systemctl start\|stop\|restart jellyfin`
Check logs (live)	`journalctl -u jellyfin -f`