darmanandClaude Opus 4.8
0995a5fe2f
Three connected changes, all triggered by the same outage. base_domain leaves mgaction.town. That zone has a wildcard A+AAAA pointing at neptun, and DNS wildcards match multi-label names, so jupiter.hosts.mgaction.town resolved publicly to NEPTUN and Caddy proxied to itself -- a silent loop rather than a lookup failure. Nesting the tailnet inside the LAN domain as orbit.sol keeps the theme and resolves unambiguously, since tailscale matches routes by longest suffix. override_local_dns = true with pihole as the only global nameserver, so roaming devices get ad blocking and .sol names off-LAN. With it false, globalResolvers land in the netmap's FallbackResolvers, which a phone with carrier DNS never consults. No public fallback is listed on purpose: tailscale treats the list as a set, so a second entry would let queries slip past the filter whenever mercury is slow. The cost is that mercury is now a single point of failure for tailnet DNS. neptun and mercury opt out individually. mercury would otherwise resolve through itself. neptun must not depend on a Pi behind a domestic line to renew the certificates for the control server every other node needs -- and it is circular besides, since tailscaled has to resolve vpn.mgaction.town to connect at all. Instead neptun runs a dnsmasq stub forwarding just orbit.sol to MagicDNS on 100.100.100.100, which tailscaled answers whenever it is running regardless of --accept-dns. That resolves jupiter live, so the hardcoded /etc/hosts pin is gone. Also sets dns.nameservers.split explicitly: nixpkgs renders its own dns.split option one level too high, but headscale reads dns.nameservers.split (hscontrol/types/config.go:722) and so does headplane, whose DNS page dies on the missing key with "Cannot convert undefined or null to object". The module's option is dead as written. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
52 lines
2.5 KiB
Nix
52 lines
2.5 KiB
Nix
{ config, pkgs, lib, ... }:
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# mercury — Raspberry Pi 3B+ (aarch64). Network DNS + DHCP (+ adblock).
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# Boots from an SD image (see flake: nixosConfigurations.mercury), so there is
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# no disko / hardware-configuration here — the sd-image module provides them.
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{
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imports = [
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../../common.nix # shared base: user / ssh / nix / firewall
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./secrets.nix # sops-nix: darman password (age key on boot part.)
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../../services/network/unbound.nix # local recursive resolver (127.0.0.1:5335)
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../../services/network/pihole.nix # DNS adblock + DHCP (declarative static leases)
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../../services/vpn/tailscale.nix # tailnet node (headscale on neptun)
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];
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networking.hostName = "mercury";
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# ---- Static networking ----
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# A DNS/DHCP server must have a fixed address. Fill in the Pi's real values
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# (from `ip -brief a` / `ip route` on the running Pi). eth0 = the Pi's NIC.
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networking.useDHCP = false;
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networking.usePredictableInterfaceNames = false; # keep it named eth0
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networking.interfaces.eth0.ipv4.addresses = [
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{ address = "10.0.0.10"; prefixLength = 24; } # the Pi's current IP
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];
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# Stable IPv6 (FRITZ!Box ULA prefix) so mercury is a fixed IPv6 DNS target.
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# SLAAC still provides the GUA + default route. Announce THIS address as the
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# DNSv6 server in the FRITZ!Box so IPv6 clients resolve .sol via pihole.
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networking.interfaces.eth0.ipv6.addresses = [
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{ address = "fd18:df17:9078:0::10"; prefixLength = 64; }
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];
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networking.defaultGateway = { address = "10.0.0.1"; interface = "eth0"; };
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networking.nameservers = [ "1.1.1.1" "9.9.9.9" ];
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# Never take the tailnet's DNS on THIS host: headscale points every node at
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# pihole, which runs here — mercury would be resolving through itself. Keep
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# the public resolvers above for the Pi's own lookups, exactly as the
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# unbound resolveLocalQueries note in CLAUDE.md requires.
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services.tailscale.extraUpFlags = [ "--accept-dns=false" ];
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# ---- pihole web admin password (from sops) ----
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# The pihole container reads FTLCONF_* env vars. Render an env file from the
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# sops secret and feed it to the container — password stays out of repo/store.
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sops.secrets.pihole_webpassword = { };
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sops.templates."pihole.env".content =
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"FTLCONF_webserver_api_password=${config.sops.placeholder.pihole_webpassword}";
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virtualisation.oci-containers.containers.pihole.environmentFiles =
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[ config.sops.templates."pihole.env".path ];
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# Do not modify after first flash.
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system.stateVersion = "26.05";
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}
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