Add penguin configuration

systems/x86_64-linux/penguin/default.nix

@@ -0,0 +1,76 @@
+{
+  pkgs,
+  inputs,
+  lib,
+  ...
+}:
+let
+  inherit (inputs) disko agenix home-manager;
+in
+{
+  imports = [
+    disko.nixosModules.disko
+    agenix.nixosModules.default
+    home-manager.nixosModules.home-manager
+    ./disko-config.nix
+    ./hardware-configuration.nix
+  ];
+  config = {
+
+    my_users.enable = true;
+    my_nix.enable = true;
+
+    networking.hostName = "penguin";
+
+    boot = {
+      tmp.cleanOnBoot = true;
+      loader = {
+        systemd-boot.enable = true;
+        efi.canTouchEfiVariables = true;
+      };
+    };
+
+    time.timeZone = "Asia/Singapore";
+
+    networking.firewall = {
+      enable = true;
+      allowedTCPPorts = [
+        22
+        3000
+        3001
+      ];
+      networkmanager.enable = true;
+      nftables.enable = true;
+      trustedInterfaces = [ "tailscale0" ];
+    };
+
+    services.openssh = {
+      enable = true;
+      settings.PasswordAuthentication = false;
+    };
+
+    users.users.cs3223 = lib.snowfall.mkUser {
+      isNormalUser = true;
+      extraGroups = [ "wheel" ];
+    };
+
+    services.tailscale.enable = true;
+    nixpkgs.config = {
+      rocmSupport = true;
+    };
+
+    programs._1password.enable = true;
+
+    environment.systemPackages = with pkgs; [
+      git
+      neovim
+    ];
+
+    virtualisation.podman = {
+      enable = true;
+      dockerCompat = true;
+      defaultNetwork.settings.dns_enabled = true;
+    };
+    system.stateVersion = "25.11";
+  };
+}

systems/x86_64-linux/penguin/disko-config.nix

@@ -0,0 +1,91 @@
+{
+  disko.devices = {
+    disk = {
+      disk1 = {
+        type = "disk";
+        device = "/dev/nvme1n1";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              size = "512M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [ "umask=0077" ];
+              };
+            };
+            crypt_p1 = {
+              size = "100%";
+              content = {
+                type = "luks";
+                name = "crypt_p1";
+                passwordFile = "/tmp/disk.key";
+                settings = {
+                  allowDiscards = true;
+                };
+              };
+            };
+          };
+        };
+      };
+      disk2 = {
+        type = "disk";
+        device = "/dev/nvme2n1";
+        content = {
+          type = "gpt";
+          partitions = {
+            crypt_p2 = {
+              size = "100%";
+              content = {
+                type = "luks";
+                name = "crypt_p2";
+                settings = {
+                  allowDiscards = true;
+                };
+                content = {
+                  type = "btrfs";
+                  extraArgs = [
+                    "-d raid1"
+                    "/dev/mapper/crypt_p1"
+                  ];
+                  subvolumes = {
+                    "@" = { };
+                    "@/root" = {
+                      mountpoint = "/";
+                      mountOptions = [
+                        "compress=zstd"
+                        "noatime"
+                      ];
+                    };
+                    "@/home" = {
+                      mountpoint = "/home";
+                      mountOptions = [
+                        "compress=zstd"
+                        "noatime"
+                      ];
+                    };
+                    "@/nix" = {
+                      mountpoint = "/nix";
+                      mountOptions = [
+                        "compress=zstd"
+                        "noatime"
+                      ];
+                    };
+                    "@/swap" = {
+                      # mountpoint = "/.swapvol";
+                      # swap.swapfile.size = "64G";
+                      mountOptions = [ "noatime" ];
+                    };
+                  };
+                };
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}

systems/x86_64-linux/penguin/hardware-configuration.nix

@@ -0,0 +1,29 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "nvme" "usbhid" "usb_storage" "sd_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-amd" ];
+  boot.extraModulePackages = [ ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp3s0.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp4s0.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp5s0f0np0.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp5s0f1np1.useDHCP = lib.mkDefault true;
+  # networking.interfaces.wlp6s0.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}