# FredOS NixOS Configuration Flake-based NixOS configuration for three machines, built and deployed directly from the Forgejo repo at `https://forg.gregersen.it/rope/nixos`. No local checkout required after initial setup. ## Machines | Hostname | Description | |---|---| | FredOS-Gaming | AMD desktop, UEFI/systemd-boot, CachyOS kernel | | FredOS-Macbook | Intel laptop, UEFI/systemd-boot | | FredOS-Mediaserver | Intel server, UEFI/systemd-boot — media services **and** the home router | ## Structure ``` ├── .forgejo │ └── workflows │ └── update.yml # Auto-updates flake.lock daily (self-hosted runner) ├── apps │ └── zen.nix # Zen browser (flake input) ├── home-manager │ └── fred.nix # User-level Home Manager config ├── hosts │ ├── FredOS-Gaming.nix # Gaming: packages, Steam, boot options │ ├── FredOS-Macbook.nix # Macbook: packages, power management, DWT daemon │ ├── FredOS-Mediaserver.nix # Mediaserver: packages, SSH, auto-upgrade │ └── hardware │ ├── FredOS-Gaming.nix # AMD GPU, CachyOS kernel overlay, filesystems, hostname │ ├── FredOS-Macbook.nix # Broadcom WiFi, Intel GPU, filesystems, hostname │ └── FredOS-Mediaserver.nix # NVIDIA NVENC, data disks, mergerfs pool, hostname ├── modules │ └── crowdsec # Vendored crowdsec modules (nixpkgs PR #446307, still open) ├── scripts # Helper scripts wrapped as packages on the mediaserver ├── services │ ├── adguard.nix # Network-wide DNS ad blocking │ ├── arr-interconnect.nix # Cross-service API key wiring for *arr apps │ ├── authelia.nix # SSO/2FA gateway for the nginx vhosts │ ├── bazarr.nix # Subtitle management │ ├── bazarr-sync.nix # Subtitle sync timers (podman container) │ ├── cloudflare-ddns.nix # Cloudflare dynamic DNS │ ├── code-server.nix # Browser-based VS Code IDE │ ├── crowdsec.nix # Intrusion prevention + nftables bouncer + ntfy alerts │ ├── dr-server.nix # Dungeon Runners game server (Wine) — currently disabled │ ├── forgejo-runner.nix # CI runner for forg.gregersen.it │ ├── frigate.nix # NVR with object detection │ ├── game-servers.nix # Dockerised 7 Days to Die servers │ ├── go2rtc.nix # Camera/RTSP streaming │ ├── homepage.nix # Homepage dashboard with auto-extracted API keys │ ├── jellyfin.nix # Media server │ ├── memos.nix # Flatnotes notes app (container) │ ├── nginx.nix # Reverse proxy + ACME wildcard cert via Cloudflare DNS-01 │ ├── profilarr.nix # Quality profile manager for *arr apps (container) │ ├── prowlarr.nix # Indexer manager │ ├── qbittorrent-nox.nix # Torrent client │ ├── radarr.nix # Movie management │ ├── router.nix # Mediaserver as home router (NAT, DHCP, nftables) │ ├── sabnzbd.nix # Usenet downloader │ ├── server-permissions.nix # Shared media dir permissions │ └── sonarr.nix # TV management ├── settings │ ├── audio.nix # PipeWire / audio config │ ├── desktop.nix # Display manager, theming, flatpak │ ├── hyprland.nix # Hyprland compositor config (Lua), anyrun │ ├── quickshell.nix # Quickshell bar/notifications (QML) │ ├── locale.nix # Locale, timezone, keyboard │ ├── shell.nix # Fish shell, powerline prompt, fastfetch, nerd fonts │ ├── stylix.nix # Unified colour theming (wallpaper-derived palette) │ └── users.nix # User accounts, SSH keys ├── templates # CSS templates recoloured by stylix.nix ├── walls # Wallpapers ├── backup-server.sh # One-shot mediaserver state backup (run manually) ├── ports.toml # WAN → LAN port forwards consumed by router.nix ├── common.nix # Shared config imported by all hosts ├── flake.lock # Auto-generated, updated daily by Forgejo Actions └── flake.nix # Flake inputs and host definitions ``` ## Day-to-day usage Edit files in the Forgejo repo (or locally and push), then on the machine run: ```bash update ``` The alias (defined in `common.nix`) runs `sudo nixos-rebuild switch --refresh --flake git+https://forg.gregersen.it/rope/nixos` with nix-output-monitor, then shows an `nvd diff` of what changed. The mediaserver also auto-upgrades daily at 05:15 (`system.autoUpgrade`). Other useful aliases: ```bash clean # sudo nix-collect-garbage -d ``` --- ## Adding a new machine ### 1. Fresh NixOS install Boot the NixOS installer and complete the standard installation. ### 2. Enable flakes temporarily (The flake config enables them declaratively, but the stock installer config doesn't.) Add to `/etc/nixos/configuration.nix` and rebuild: ```nix nix.settings.experimental-features = [ "nix-command" "flakes" ]; ``` ### 3. Create the hardware config in the repo Copy `/etc/nixos/hardware-configuration.nix` to `hosts/hardware/FredOS-NEWHOST.nix` and append the hostname and bootloader config: ```nix networking.hostName = "FredOS-NEWHOST"; boot.loader.systemd-boot.enable = true; boot.loader.efi.canTouchEfiVariables = true; ``` ### 4. Register the host in flake.nix ```nix FredOS-NEWHOST = mkHost "FredOS-NEWHOST" []; ``` ### 5. Add host-specific config Create `hosts/FredOS-NEWHOST.nix` for machine-specific packages or services. `mkHost` imports it automatically — no changes to `common.nix` needed. ### 6. Switch to the flake Run once with the explicit hostname: ```bash sudo nixos-rebuild switch --refresh --flake git+https://forg.gregersen.it/rope/nixos#FredOS-NEWHOST ``` After this succeeds, the plain `update` alias works from then on. --- ## Flake inputs | Input | Source | |---|---| | nixpkgs | `github:NixOS/nixpkgs/nixos-26.05` | | home-manager | `github:nix-community/home-manager/release-26.05` | | stylix | `github:nix-community/stylix/release-26.05` | | zen-browser | `github:0xc000022070/zen-browser-flake` | | nix-cachyos-kernel | `github:xddxdd/nix-cachyos-kernel/release` (own nixpkgs pin — keeps their kernel binary cache usable) | | proton-cachyos-nix | `github:powerofthe69/proton-cachyos-nix` | ## Mediaserver secrets Several services on FredOS-Mediaserver require secrets stored on the machine (not in the repo). After a fresh deploy, create these before running `update`: ```bash # Cloudflare API token (used by DDNS and ACME wildcard cert) echo -n 'your-cloudflare-api-token' | sudo tee /var/secrets/cloudflare-token sudo chmod 600 /var/secrets/cloudflare-token # go2rtc RTSP camera URL echo -n 'rtsp://username:password@camera-ip:554/stream1' | sudo tee /var/secrets/go2rtc-rtsp-url sudo chmod 600 /var/secrets/go2rtc-rtsp-url # CrowdSec ntfy.sh alert topic (injected into the notification config at service start) echo 'https://ntfy.sh/your-private-topic' | sudo tee /var/secrets/ntfy-url sudo chmod 600 /var/secrets/ntfy-url # Forgejo Actions runner registration token (one-time use, KEY=value format) echo 'TOKEN=YOUR_REGISTRATION_TOKEN' | sudo tee /var/secrets/forgejo-runner-token sudo chmod 600 /var/secrets/forgejo-runner-token # Authelia secrets — readable by the authelia-main group sudo mkdir -p /var/secrets/authelia echo -n 'random-jwt-secret' | sudo tee /var/secrets/authelia/jwt_secret echo -n 'random-session-secret' | sudo tee /var/secrets/authelia/session_secret echo -n 'random-storage-encryption-key' | sudo tee /var/secrets/authelia/storage_encryption_key sudo chown root:authelia-main /var/secrets/authelia/* sudo chmod 640 /var/secrets/authelia/* # Authelia user database # Create users_database.yml with this structure: # --- # users: # username: # password: "$argon2id$..." # hashed — see below # displayname: Display Name # email: user@example.com # # Generate a password hash with: # nix-shell -p authelia --run "authelia crypto hash generate argon2" sudo mkdir -p /var/lib/authelia-main sudo nano /var/lib/authelia-main/users_database.yml sudo chown authelia-main:authelia-main /var/lib/authelia-main/users_database.yml ``` ## Migrating to a new server When moving FredOS-Mediaserver to new hardware, back up these state directories from the old server (`backup-server.sh` automates most of it): ```bash # Service databases and config (stop services first) /var/lib/jellyfin/ # Library database, users, metadata, API keys /var/lib/sonarr/ # TV library database, config.xml (API key) /var/lib/radarr/ # Movie library database, config.xml (API key) /var/lib/prowlarr/ # Indexer database, config.xml (API key) /var/lib/bazarr/ # Subtitle database and config /var/lib/qbittorrent/ # Torrent client config and state /var/lib/authelia-main/ # User database and session storage # Secrets /var/secrets/ # See "Mediaserver secrets" above # Media files /mnt/storage/ # The mergerfs pool (torrents, media libraries, audiobooks) ``` Steps: 1. Install NixOS on the new server 2. Update `hosts/hardware/FredOS-Mediaserver.nix` from the new `/etc/nixos/hardware-configuration.nix` (new disk UUIDs, bootloader config) 3. Set up the mergerfs pool and mount at `/mnt/storage` 4. Restore `/var/secrets/` (see Mediaserver secrets section above) 5. Run `sudo nixos-rebuild switch --refresh --flake git+https://forg.gregersen.it/rope/nixos#FredOS-Mediaserver` 6. Stop all services, restore the `/var/lib/` directories listed above, then start services 7. Update Cloudflare DNS if the server's public IP changed If starting fresh instead of migrating, the services self-initialize with empty databases — redo initial setup in each web UI; `arr-interconnect` auto-wires the connections between them. ## Notes - The mediaserver is also the home router: `services/router.nix` owns nftables NAT/firewall and `networking.firewall` is **disabled** on that host. WAN exposure is controlled solely by `ports.toml`; LAN traffic is trusted wholesale. - `hosts/hardware/` files are committed — they contain UUIDs and disk layout but no sensitive credentials - Host-specific behaviour is gated with `lib.mkIf (config.networking.hostName == "...")` or `lib.elem config.networking.hostName [...]`; host modules themselves are selected by `mkHost` in `flake.nix` - `modules/crowdsec/` vendors the crowdsec module rewrite from nixpkgs PR #446307 — delete it (and the `disabledModules`/`imports` lines in `services/crowdsec.nix`) once that PR lands in the pinned channel