Archived
beatzaplentyandClaude Sonnet 5
53b9a64826
nix-serve's secretKeyFile was a manual, undocumented-outside-a-comment `nix-store --generate-binary-cache-key` step per host -- easy to miss on a fresh nix-cache instance (as lxc-nix-cache testing just found: systemd fails the unit with EXIT_CREDENTIALS when LoadCredential can't find the source file, which nginx then reports as a 502 from clients). It also can't be regenerated per-host safely: modules/nix-cache/client.nix hardcodes every client's trust in one specific public key, so every nix-cache instance has to share the exact same keypair. Sourced from secrets/nix-cache.yaml's new cache-priv-key entry instead, via the same sops-nix pattern every other secret in this repo already uses. Verified the added value derives to the exact public key modules/nix-cache/client.nix already trusts before committing. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01La55Nsss8jZ7ZuzUV9mfot
62 lines
2.0 KiB
Nix
62 lines
2.0 KiB
Nix
{ config, pkgs, vars, ... }:
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{
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# nix-serve's signing key has to be the *same* key on every host that
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# ever plays the nix-cache role -- modules/nix-cache/client.nix hardcodes
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# every client's trust in one specific public key ("cache.local-1:..."),
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# so a freshly self-generated key here wouldn't be trusted by anyone.
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# Managed via sops-nix like every other secret in this repo instead of
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# the old manual `nix-store --generate-binary-cache-key` step -- see
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# "Binary cache signing key" in docs/nix-cache.md for how to add/rotate
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# the value in secrets/nix-cache.yaml.
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sops.secrets."cache-priv-key".sopsFile = ../../secrets/nix-cache.yaml;
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services = {
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nix-serve = {
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enable = true;
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secretKeyFile = config.sops.secrets."cache-priv-key".path;
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};
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nginx = {
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enable = true;
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recommendedProxySettings = true;
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virtualHosts.${vars.nixCacheHost} = {
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locations."/" = {
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proxyPass = "http://${config.services.nix-serve.bindAddress}:${toString config.services.nix-serve.port}";
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};
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};
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};
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openssh.enable = true;
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};
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networking.firewall.allowedTCPPorts = [ vars.ports.nixCacheHttp ];
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users.groups.${vars.remoteBuilderUser} = { };
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users.users.${vars.remoteBuilderUser} = {
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isSystemUser = true;
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group = vars.remoteBuilderUser;
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createHome = true;
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home = "/var/lib/nixremote";
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shell = pkgs.bashInteractive;
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# Client public keys allowed to use this host as a remote builder —
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# single source of truth is vars.remoteBuilderAuthorizedKeys (safe to
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# commit public keys only).
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openssh.authorizedKeys.keys = vars.remoteBuilderAuthorizedKeys;
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};
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nix.settings = {
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trusted-users = [ "root" vars.remoteBuilderUser ];
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experimental-features = [ "nix-command" "flakes" ];
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auto-optimise-store = true;
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builders-use-substitutes = true;
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};
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nix.gc = {
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automatic = true;
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dates = "weekly";
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options = "--delete-older-than ${vars.nixCacheGcMaxAge}";
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};
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}
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