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docs: capture DNS resilience and Technitium backup sync
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Fizzlepoof
2026-05-24 02:49:23 +00:00
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docs/architecture/ARCHITECTURE_OVERVIEW.md
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@@ -23,8 +23,9 @@ Full homelab stack as of 2026-05-09. All 6 expansion phases are complete and dep
- **UniFi policy zones:** `Internal` = Management + Trusted + Servers, `Untrusted` = IoT + Cameras + Old IoT, `Hotspot` = Guest
- **Current custom firewall hardening:** `Allow Internal to Untrusted`, `Block Untrusted to Gateway Admin Surfaces`, `Allow Untrusted to DNS Resolver`, `Block Untrusted to Gateway Default Services`, `Allow Untrusted to Gateway DHCP`, `Allow Untrusted to Gateway mDNS`, plus explicit public-DNS allows used for fallback
- **Current DHCP DNS policy:** `Management`, `Trusted`, `Servers`, `IoT`, `Camera`, and `Old IoT` advertise the Technitium trio `10.5.30.8`, `10.5.30.9`, and `10.5.30.10`, followed by external fallback `9.9.9.9`; `Guest` advertises `9.9.9.9` and `1.1.1.1`
- **Net effect:** every non-guest lane now has three independent internal Technitium resolvers for both public DNS and the private `home.paccoco.com` zone, plus external fallback if all homelab resolvers are down; untrusted lanes still retain DNS, DHCP, and mDNS but no longer have general gateway access or UDM Pro admin-surface access
- **Current DNS caveat:** the backup Technitium nodes on N.O.M.A.D. (`10.5.30.9`) and Serenity (`10.5.30.10`) start from a cloned PD Technitium config, so future authoritative-zone changes on PD must be resynced or automated to keep all three nodes aligned
- **Net effect:** every non-guest lane now has three independent internal Technitium resolvers for both public DNS and the private `home.paccoco.com` zone, plus external fallback for general internet name resolution if all homelab resolvers are down; untrusted lanes still retain DNS, DHCP, and mDNS but no longer have general gateway access or UDM Pro admin-surface access
- **Current sync model:** PD (`10.5.30.8`) is the authoritative Technitium source, and root cron on PD runs `/mnt/docker-ssd/docker/compose/technitium-pilot/bin/sync_backup_nodes.sh` every 15 minutes to rsync the live config to N.O.M.A.D. (`10.5.30.9`) and Serenity (`10.5.30.10`), restart those backup stacks, and verify both private and public DNS answers
- **Current DNS caveats:** `9.9.9.9` preserves public DNS continuity but is not an authoritative substitute for the internal `home.paccoco.com` zone; same-host macvlan tests are also misleading, so resolver verification must come from an off-host client or peer host
- **Tailscale:** Serenity reachable at 100.94.87.79
- **NFS:** Serenity exports `/mnt/user/data` and `/mnt/user/immich` → mounted on PD at `/mnt/unraid/` via post-init script
- **Docker networking:** Cross-stack communication via named external networks (`ai-services`, `ix-databases_shared-databases`)