nix-dotfiles/modules/kubernetes.nix

{
  config,
  pkgs,
  lib,
  ...
}:

{
  options = {
    services.kubernetes = {
      enable = lib.mkOption {
        type = lib.types.bool;
        default = false;
        description = "Whether to enable Kubernetes services";
      };

      version = lib.mkOption {
        type = lib.types.str;
        default = "1.28.0";
        description = "Kubernetes version to use";
      };

      clusterName = lib.mkOption {
        type = lib.types.str;
        default = "palatine-hill-cluster";
        description = "Name of the Kubernetes cluster";
      };

      controlPlaneEndpoint = lib.mkOption {
        type = lib.types.str;
        default = "localhost:6443";
        description = "Control plane endpoint";
      };

      networking = lib.mkOption {
        type = lib.types.attrs;
        default = { };
        description = "Kubernetes networking configuration";
      };
    };
  };

  config = lib.mkIf config.services.kubernetes.enable {
    environment.systemPackages = with pkgs; [
      kubectl
      kubernetes
    ];

    # Enable containerd for Kubernetes
    virtualisation.containerd.enable = true;

    # Enable kubelet
    services.kubelet = {
      enable = true;
      extraFlags = {
        "pod-infra-container-image" = "registry.k8s.io/pause:3.9";
      };
    };

    # Enable kubeadm for cluster initialization
    environment.etc."kubeadm.yaml".text = ''
      apiVersion: kubeadm.k8s.io/v1beta3
      kind: InitConfiguration
      localAPIEndpoint:
        advertiseAddress: 127.0.0.1
        bindPort: 6443
      ---
      apiVersion: kubeadm.k8s.io/v1beta3
      kind: ClusterConfiguration
      clusterName: ${config.services.kubernetes.clusterName}
      controlPlaneEndpoint: ${config.services.kubernetes.controlPlaneEndpoint}
      networking:
        serviceSubnet: 10.96.0.0/12
        podSubnet: 10.244.0.0/16
        dnsDomain: cluster.local
    '';
  };
}