Add kube-scheduler.

nix/kubernetes/roles/kube_scheduler/default.nix

@@ -0,0 +1,51 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  # shellCommand = cmd: (lib.concatMapStringsSep " " lib.strings.escapeShellArg cmd);
+  shellCommand = cmd: (builtins.concatStringsSep " " cmd);
+in
+{
+  imports = [ ];
+
+  options.me = {
+    kube_scheduler.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install kube_scheduler.";
+    };
+  };
+
+  config = lib.mkIf config.me.kube_scheduler.enable {
+    systemd.services.kube-scheduler = {
+      enable = true;
+      description = "Kubernetes Scheduler";
+      documentation = [ "https://github.com/kubernetes/kubernetes" ];
+      wantedBy = [ "kubernetes.target" ];
+      after = [ "kube-apiserver.service" ];
+      # path = with pkgs; [
+      #   zfs
+      # ];
+      unitConfig.DefaultDependencies = "no";
+      serviceConfig = {
+        ExecStart = (
+          shellCommand [
+            # NEW:
+            "${pkgs.kubernetes}/bin/kube-scheduler"
+            "--config=${./files/kube-scheduler.yaml}"
+            "--v=2"
+          ]
+        );
+        Restart = "on-failure";
+        RestartSec = 5;
+        LimitNOFILE = 65536;
+        User = "kubernetes";
+      };
+    };
+  };
+}