Add central Nix builder and binary cache

2026-10-07 03:34:08 +09:00 · 2026-08-31 08:07:48 +09:00
parent fda29cd08d
commit ec3770502d
21 changed files with 438 additions and 39 deletions
@@ -0,0 +1,33 @@
+{ primaryUser, ... }:
+let
+  GiB = 1024 * 1024 * 1024;
+in
+{
+  nix = {
+    nrBuildUsers = 64;
+
+    settings = {
+      # Limit concurrent derivations so build scratch and memory usage remain
+      # bounded. Each derivation may still use every vCPU exposed to the VM.
+      max-jobs = 2;
+      cores = 0;
+
+      # Keep enough room for large desktop, browser, and CUDA closures.
+      min-free = 64 * GiB;
+      max-free = 128 * GiB;
+    };
+  };
+
+  systemd.services.nix-daemon.serviceConfig = {
+    MemoryAccounting = true;
+    MemoryMax = "90%";
+    OOMScoreAdjust = 500;
+  };
+
+  systemd.tmpfiles.rules = [
+    "d /var/lib/nix-fleet 0750 ${primaryUser} users - -"
+    "d /var/lib/nix-fleet/roots 0750 ${primaryUser} users - -"
+    "d /var/lib/nix-fleet/roots/build 0750 ${primaryUser} users - -"
+    "d /var/lib/nix-fleet/roots/deploy 0750 ${primaryUser} users - -"
+  ];
+}