refactor: generate kubeadm host configs from flake

nixos/kubeadm/README.md

@@ -12,6 +12,7 @@ This folder defines role-based NixOS configs for a kubeadm cluster.
 - Shared Kubernetes/node prerequisites in `modules/k8s-common.nix`
 - Shared cluster defaults in `modules/k8s-cluster-settings.nix`
 - Role-specific settings for control planes and workers
+- Generated per-node host configs from `flake.nix` (no duplicated host files)
 - Bootstrap helper commands:
   - `th-kubeadm-init`
   - `th-kubeadm-join-control-plane`
@@ -20,7 +21,7 @@ This folder defines role-based NixOS configs for a kubeadm cluster.
 
 ## Hardware config files
 
-Each host file optionally imports `hosts/hardware/<host>.nix` if present.
+The flake automatically imports `hosts/hardware/<host>.nix` if present.
 Copy each node's generated hardware config into this folder:
 
 ```bash

nixos/kubeadm/flake.nix

@@ -8,19 +8,31 @@
   outputs = { nixpkgs, ... }:
     let
       system = "x86_64-linux";
-      mkHost = hostModules:
+      lib = nixpkgs.lib;
+
+      mkNode = { name, role }:
+        let
+          roleModule = if role == "control-plane" then ./modules/k8s-control-plane.nix else ./modules/k8s-worker.nix;
+          hardwarePath = ./hosts/hardware + "/${name}.nix";
+        in
         nixpkgs.lib.nixosSystem {
           inherit system;
-          modules = hostModules;
+          modules = [
+            ./modules/k8s-cluster-settings.nix
+            ./modules/k8s-common.nix
+            roleModule
+            ({ lib, ... }: {
+              imports = lib.optional (builtins.pathExists hardwarePath) hardwarePath;
+              networking.hostName = name;
+              system.stateVersion = "25.05";
+            })
+          ];
         };
     in {
-      nixosConfigurations = {
+      nixosConfigurations = lib.genAttrs [ "cp-1" "cp-2" "cp-3" "wk-1" "wk-2" "wk-3" ] (name:
-        cp-1 = mkHost [ ./hosts/cp-1.nix ];
+        mkNode {
-        cp-2 = mkHost [ ./hosts/cp-2.nix ];
+          inherit name;
-        cp-3 = mkHost [ ./hosts/cp-3.nix ];
+          role = if lib.hasPrefix "cp-" name then "control-plane" else "worker";
-        wk-1 = mkHost [ ./hosts/wk-1.nix ];
+        });
-        wk-2 = mkHost [ ./hosts/wk-2.nix ];
-        wk-3 = mkHost [ ./hosts/wk-3.nix ];
-      };
     };
 }

nixos/kubeadm/hosts/cp-1.nix

@@ -1,15 +0,0 @@
-{ lib, ... }:
-
-{
-  imports =
-    [
-      ../modules/k8s-cluster-settings.nix
-      ../modules/k8s-common.nix
-      ../modules/k8s-control-plane.nix
-    ]
-    ++ lib.optional (builtins.pathExists ./hardware/cp-1.nix) ./hardware/cp-1.nix;
-
-  networking.hostName = "cp-1";
-
-  system.stateVersion = "25.05";
-}

nixos/kubeadm/hosts/cp-2.nix

@@ -1,15 +0,0 @@
-{ lib, ... }:
-
-{
-  imports =
-    [
-      ../modules/k8s-cluster-settings.nix
-      ../modules/k8s-common.nix
-      ../modules/k8s-control-plane.nix
-    ]
-    ++ lib.optional (builtins.pathExists ./hardware/cp-2.nix) ./hardware/cp-2.nix;
-
-  networking.hostName = "cp-2";
-
-  system.stateVersion = "25.05";
-}

nixos/kubeadm/hosts/cp-3.nix

@@ -1,15 +0,0 @@
-{ lib, ... }:
-
-{
-  imports =
-    [
-      ../modules/k8s-cluster-settings.nix
-      ../modules/k8s-common.nix
-      ../modules/k8s-control-plane.nix
-    ]
-    ++ lib.optional (builtins.pathExists ./hardware/cp-3.nix) ./hardware/cp-3.nix;
-
-  networking.hostName = "cp-3";
-
-  system.stateVersion = "25.05";
-}

nixos/kubeadm/hosts/wk-1.nix

@@ -1,15 +0,0 @@
-{ lib, ... }:
-
-{
-  imports =
-    [
-      ../modules/k8s-cluster-settings.nix
-      ../modules/k8s-common.nix
-      ../modules/k8s-worker.nix
-    ]
-    ++ lib.optional (builtins.pathExists ./hardware/wk-1.nix) ./hardware/wk-1.nix;
-
-  networking.hostName = "wk-1";
-
-  system.stateVersion = "25.05";
-}

nixos/kubeadm/hosts/wk-2.nix

@@ -1,15 +0,0 @@
-{ lib, ... }:
-
-{
-  imports =
-    [
-      ../modules/k8s-cluster-settings.nix
-      ../modules/k8s-common.nix
-      ../modules/k8s-worker.nix
-    ]
-    ++ lib.optional (builtins.pathExists ./hardware/wk-2.nix) ./hardware/wk-2.nix;
-
-  networking.hostName = "wk-2";
-
-  system.stateVersion = "25.05";
-}

nixos/kubeadm/hosts/wk-3.nix

@@ -1,15 +0,0 @@
-{ lib, ... }:
-
-{
-  imports =
-    [
-      ../modules/k8s-cluster-settings.nix
-      ../modules/k8s-common.nix
-      ../modules/k8s-worker.nix
-    ]
-    ++ lib.optional (builtins.pathExists ./hardware/wk-3.nix) ./hardware/wk-3.nix;
-
-  networking.hostName = "wk-3";
-
-  system.stateVersion = "25.05";
-}