nixos/kubernetes: major module refactor

- All kubernetes components have been seperated into different files
- All TLS-enabled ports have been deprecated and disabled by default
- EasyCert option added to support automatic cluster PKI-bootstrap
- RBAC has been enforced for all cluster components by default
- NixOS kubernetes test cases make use of easyCerts to setup PKI

1 files changed, 80 insertions, 0 deletions

diff --git a/nixos/modules/services/cluster/kubernetes/proxy.nix b/nixos/modules/services/cluster/kubernetes/proxy.nix
new file mode 100644
index 00000000000..6bcf2eaca82
--- /dev/null
+++ b/nixos/modules/services/cluster/kubernetes/proxy.nix
@@ -0,0 +1,80 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  top = config.services.kubernetes;
+  cfg = top.proxy;
+in
+{
+
+  ###### interface
+  options.services.kubernetes.proxy = with lib.types; {
+
+    bindAddress = mkOption {
+      description = "Kubernetes proxy listening address.";
+      default = "0.0.0.0";
+      type = str;
+    };
+
+    enable = mkEnableOption "Whether to enable Kubernetes proxy.";
+
+    extraOpts = mkOption {
+      description = "Kubernetes proxy extra command line options.";
+      default = "";
+      type = str;
+    };
+
+    featureGates = mkOption {
+      description = "List set of feature gates";
+      default = top.featureGates;
+      type = listOf str;
+    };
+
+    kubeconfig = top.lib.mkKubeConfigOptions "Kubernetes proxy";
+
+    verbosity = mkOption {
+      description = ''
+        Optional glog verbosity level for logging statements. See
+        <link xlink:href="https://github.com/kubernetes/community/blob/master/contributors/devel/logging.md"/>
+      '';
+      default = null;
+      type = nullOr int;
+    };
+
+  };
+
+  ###### implementation
+  config = mkIf cfg.enable {
+    systemd.services.kube-proxy = {
+      description = "Kubernetes Proxy Service";
+      wantedBy = [ "kubernetes.target" ];
+      after = [ "kube-apiserver.service" ];
+      path = with pkgs; [ iptables conntrack_tools ];
+      serviceConfig = {
+        Slice = "kubernetes.slice";
+        ExecStart = ''${top.package}/bin/kube-proxy \
+          --bind-address=${cfg.bindAddress} \
+          ${optionalString (top.clusterCidr!=null)
+            "--cluster-cidr=${top.clusterCidr}"} \
+          ${optionalString (cfg.featureGates != [])
+            "--feature-gates=${concatMapStringsSep "," (feature: "${feature}=true") cfg.featureGates}"} \
+          --kubeconfig=${top.lib.mkKubeConfig "kube-proxy" cfg.kubeconfig} \
+          ${optionalString (cfg.verbosity != null) "--v=${toString cfg.verbosity}"} \
+          ${cfg.extraOpts}
+        '';
+        WorkingDirectory = top.dataDir;
+      };
+    };
+
+    services.kubernetes.pki.certs = {
+      kubeProxyClient = top.lib.mkCert {
+        name = "kube-proxy-client";
+        CN = "system:kube-proxy";
+        action = "systemctl restart kube-proxy.service";
+      };
+    };
+
+    services.kubernetes.proxy.kubeconfig.server = mkDefault top.apiserverAddress;
+  };
+}