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Use /etc/hosts for internal Metacircular names (Tailscale DNS workaround)

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Kyle Isom
2026-03-26 15:41:30 -07:00
parent ad3b6b949b
commit 0e54bd5fe7
1 changed files with 12 additions and 29 deletions
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39
hw/vade/default.nix
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@@ -40,34 +40,17 @@
''
];
# Route internal Metacircular zones to rift's CoreDNS (MCNS precursor).
# Tailscale sets ~. (catch-all) on tailscale0, which overrides global
# domain routing. We need a per-link override that takes priority.
# This systemd service runs after tailscale and adds the routing domain
# to a virtual interface that points at rift's CoreDNS.
networking.nameservers = [
"192.168.88.181"
"100.95.252.120"
# Internal Metacircular service addresses. Tailscale's MagicDNS intercepts
# *.mcp.metacircular.net queries (via its ~. catch-all on tailscale0) and
# returns wrong IPs. Static /etc/hosts entries bypass DNS entirely.
# When MCNS becomes a full service with proper DNS integration, this can
# be replaced with split-horizon DNS configuration.
networking.hosts = {
"100.95.252.120" = [
"metacrypt.svc.mcp.metacircular.net"
"mcr.svc.mcp.metacircular.net"
"mcp-agent.svc.mcp.metacircular.net"
"rift.mcp.metacircular.net"
];
systemd.services.mcp-dns-route = {
description = "Route mcp.metacircular.net DNS to rift CoreDNS";
after = [ "network-online.target" "tailscaled.service" ];
wants = [ "network-online.target" ];
wantedBy = [ "multi-user.target" ];
# Tailscale sets ~. (catch-all) on tailscale0, overriding all other
# DNS routing. We replace it with specific routes: Tailscale names
# stay on Tailscale DNS, and mcp.metacircular.net goes to rift's
# CoreDNS (via the Tailscale overlay).
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
};
script = ''
# Add rift's CoreDNS alongside Tailscale's DNS on the tailscale0 link
${pkgs.systemd}/bin/resolvectl dns tailscale0 100.100.100.100 100.95.252.120
# Replace ~. with specific routing domains
${pkgs.systemd}/bin/resolvectl domain tailscale0 ~scylla-hammerhead.ts.net ~mcp.metacircular.net
'';
};
}