Extensible DDNS

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Overview
+
+This is a NixOS homelab configuration using Nix flakes. The setup includes a self-hosted Jellyfin media server, personal website hosting, VPN access via Tailscale, and automated DNS management with AWS Route53.
+
+## Development Commands
+
+### System Management
+- `sudo nixos-rebuild switch --flake .#homelab` - Apply configuration changes
+- `sudo nixos-rebuild test --flake .#homelab` - Test configuration without making it default
+- `nix flake update` - Update flake inputs (updates flake.lock)
+- `nixfmt-classic *.nix` - Format Nix files using the installed formatter
+
+### Git Operations
+- Configuration is version controlled - commit changes after testing
+- Current branch: main
+- Modified files: flake.nix, users.nix (check git status)
+
+## Architecture
+
+### Flake Structure
+- `flake.nix` - Main flake definition with inputs (nixpkgs, agenix, personal site)
+- `configuration.nix` - Default NixOS configuration (mostly commented out)
+- `system.nix` - System-level settings (boot, power management)
+- `packages.nix` - System packages (neovim, git, tools)
+- `users.nix` - User configuration for lucas user with fish shell
+
+### Modular Organization
+- `networking/` - Network configuration modules
+  - `host.nix` - Static IP, firewall, Avahi discovery
+  - `ssh.nix` - SSH daemon configuration
+  - `adblock.nix` - Ad blocking setup
+  - `vpn-host.nix` - Tailscale VPN with auto-connect
+- `services/` - Service modules
+  - `jellyfin.nix` - Media server with Deluge torrent client
+  - `site.nix` - Nginx reverse proxy, ACME SSL, Route53 DDNS
+
+### Secret Management
+- Uses agenix for encrypted secrets
+- `secrets/aws.age` - AWS credentials for Route53 updates
+- `tailscale.age` - Tailscale authentication key
+
+### Key Services
+- **Jellyfin**: Media server on port 8096, proxied via jellyfin.per-aspera.space
+- **Personal Website**: Static site from GitHub repo served at per-aspera.space
+- **Deluge**: Torrent client with web interface
+- **Route53 DDNS**: Automated IP updates every 5 minutes
+- **Tailscale**: VPN access with firewall rules
+
+### Network Configuration
+- Static IP: 192.168.0.10/24
+- Hostname: homelab
+- Firewall: Configured per service (HTTP/HTTPS, Jellyfin, SSH via Tailscale)
+- Custom nameservers: 205.171.3.25, 8.8.8.8
+
+## Important Notes
+
+- System is configured as a server (no hibernation/suspend)
+- Uses systemd-boot EFI bootloader
+- Multimedia group for media file permissions at /data/media
+- Fish shell is the default for the lucas user
+- ACME certificates automatically managed for per-aspera.space domain