remote builder works

modules/system/nix-cli/default.nix

@@ -0,0 +1,52 @@
+{
+config
+, lib
+, pkgs
+, ...
+}: 
+let
+  # To use this feature add -j0 to any nix commad.
+  hostName = "10.18.1.60";
+  pubKey = "bob:cday7vAQb+UWE1gQOAOjqnXB8EdjkBt+/Ife/R0ylUY=";
+in {
+    nix = {
+      distributedBuilds = true;
+      settings = {
+        trusted-public-keys = lib.mkAfter [
+          pubKey
+        ];
+        builders-use-substitutes = true;
+        # substituters = lib.mkAfter [
+        #   "ssh-ng://nix-ssh@${hostname}"
+        # ];
+        # allowed-users = [
+        #   "@wheel"
+        #   "@builders"
+        # ];
+        # trusted-users = [
+        #   "root"
+        #   "nix-ssh"
+        # ];
+      };
+      buildMachines = [
+          {
+            inherit hostName;
+            protocol = "ssh-ng";
+            maxJobs = 8;
+            systems = [
+              "x86_64-linux"
+              "i686-linux"
+            ];
+            supportedFeatures = [
+              "big-parallel"
+              "nixos-test"
+              "kvm"
+              "benchmark"
+            ];
+            sshUser = "root";
+            sshKey = "/root/.ssh/id_ed25519";
+            # publicHostKey = 
+          }
+        ];
+    };
+}