Sonarr and Radarr login: there is no default
Sonarr and Radarr ship with no default username or password. Where config.xml lives in Docker, and how to reset a lost login in under a minute.
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Fix the Sonarr/Radarr Allowed Hosts warning
Sonarr and Radarr warn that Allowed Hosts is not configured. Here is what to type in that field for your setup, and how to get back in if you are locked out.
Disable Sonarr and Radarr authentication
Every way to turn off Sonarr and Radarr login, what the local address option really means on a VPS, and the three setups that are actually safe.
Arr stack ports: what each app listens on
Default ports for Sonarr, Radarr, Prowlarr, Bazarr, qBittorrent, Jellyfin, Seerr and FlareSolverr, plus how to keep every one of them off the public internet.
Arr stack folder structure and hardlinks
Why Sonarr and Radarr copy instead of hardlink, the single /data layout that fixes it, the compose volumes to match, and how to prove an import linked.
The arr stack in one Docker Compose file
Run Prowlarr, Sonarr, Radarr and qBittorrent from one Docker Compose file on a VPS, with the shared PUID, PGID and volume layout that keeps hardlinks working.
Huntarr is gone: what to run instead
Huntarr exposed every connected arr API key, then its repo was deleted. Remove it, rotate your keys, and replace it with Wanted searches or a guarded fork.
Sonarr and Radarr behind a reverse proxy
Run Sonarr and Radarr behind nginx or Traefik with forward auth: the Allowed Hosts entries that stop Invalid Hostname errors, and why /api must skip login.