Add raccoon workstation with Nvidia GPU

The raccoon workstation has a Nvidia GTX 960 GPU which will be used for
CUDA experiments. The configuration uses the production Nvidia driver
at version 550 which still supports the GPU. The current CUDA 12.2
version is also supported by the driver.

The workstation has Internet access directly from the gateway, but name
resolution via Google DNS servers seems to be blocked, so we use BSC
servers for now.

The NixOS system is installed in a partition alongside the old Debian
system, until we decide that is no longer neccesary to keep both. The
old /home partition is not used as we are using the same UIDs and groups
from the xeon machines, which don't match the ones here.

flake.nix

@@ -17,13 +17,14 @@ let
 in
   {
     nixosConfigurations = {
-      hut   = mkConf "hut";
-      owl1  = mkConf "owl1";
-      owl2  = mkConf "owl2";
-      eudy  = mkConf "eudy";
-      koro  = mkConf "koro";
-      bay   = mkConf "bay";
-      lake2 = mkConf "lake2";
+      hut     = mkConf "hut";
+      owl1    = mkConf "owl1";
+      owl2    = mkConf "owl2";
+      eudy    = mkConf "eudy";
+      koro    = mkConf "koro";
+      bay     = mkConf "bay";
+      lake2   = mkConf "lake2";
+      raccoon = mkConf "raccoon";
     };
 
     packages.x86_64-linux = self.nixosConfigurations.hut.pkgs // {

m/common/base/net.nix

@@ -12,6 +12,8 @@
 
     hosts = {
       "84.88.53.236" = [ "ssfhead.bsc.es" "ssfhead" ];
+      "84.88.51.152" = [ "knights3.bsc.es" "raccoon" ];
+      "84.88.51.142" = [ "raccoon-ipmi" ];
     };
   };
 }

m/common/base/users.nix

@@ -68,7 +68,7 @@
         home = "/home/Computational/anavarro";
         description = "Antoni Navarro";
         group = "Computational";
-        hosts = [ "hut" ];
+        hosts = [ "hut" "raccoon" ];
         hashedPassword = "$6$QdNDsuLehoZTYZlb$CDhCouYDPrhoiB7/seu7RF.Gqg4zMQz0n5sA4U1KDgHaZOxy2as9pbIGeF8tOHJKRoZajk5GiaZv0rZMn7Oq31";
         openssh.authorizedKeys.keys = [
           "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILWjRSlKgzBPZQhIeEtk6Lvws2XNcYwHcwPv4osSgst5 anavarro@ssfhead"

m/raccoon/configuration.nix

@@ -0,0 +1,32 @@
+{ config, pkgs, lib, modulesPath, ... }:
+
+{
+  imports = [
+    ../common/base.nix
+  ];
+
+  # Don't install Grub on the disk yet
+  boot.loader.grub.device = "nodev";
+
+  networking = {
+    hostName = "raccoon";
+    # Only BSC DNSs seem to be reachable from the office VLAN
+    nameservers = [ "84.88.52.35" "84.88.52.36" ];
+    defaultGateway = "84.88.51.129";
+    interfaces.eno0.ipv4.addresses = [ {
+      address = "84.88.51.152";
+      prefixLength = 25;
+    } ];
+  };
+
+  # Configure Nvidia driver to use with CUDA
+  hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.production;
+  hardware.opengl = {
+    enable = true;
+    driSupport = true;
+    setLdLibraryPath = true;
+  };
+  nixpkgs.config.allowUnfree = true;
+  nixpkgs.config.nvidia.acceptLicense = true;
+  services.xserver.videoDrivers = [ "nvidia" ];
+}