Update k0 to multi etcd

clusters/k0/default.nix

@@ -1,13 +1,25 @@
 # Pin the deployment package-set to a specific version of nixpkgs
-# with import <nixpkgs> {};
-with import ../nixos-21.05.nix {};
+# with import ../nixos-21.05.nix {};
+with import <nixpkgs> {};
 let
+  etcdNodes = {
+    k0-0 = "10.1.8.50";
+    k0-1 = "10.1.8.51";
+    k0-2 = "10.1.8.52";
+  };
 
   master = {
-    node.name = "k0-0";
-    node.address = "10.1.8.50";
-    features.k8s.master.enable = true;
-    features.k8s.nodes = nodes;
+    features.k8s = {
+      host.name = "k0-0";
+      host.address = "10.1.8.50";
+      master.enable = true;
+      nodes = nodes;
+      etcdCluster = {
+        enable = true;
+        existing = true;
+        nodes = etcdNodes;
+      };
+    };
     services.kubernetes.kubelet.unschedulable = true;
     imports = [ ./cluster.nix ./hw/k0-0.nix ];
   };
@@ -19,13 +31,24 @@ let
 
   mkNode = x: {
     "${x.name}" =
+    lib.mkMerge [
       {
-        node = x;
-        imports = [ ./cluster.nix  (./hw + "/${x.name}.nix") ];
-      };
+        features.k8s.host = x;
+      }
+      (if builtins.hasAttr x.name etcdNodes then
+        {
+          features.k8s.etcdCluster = {
+            enable = true;
+            existing = true;
+            nodes = etcdNodes;
+          };
+        }
+        else {})
+      ]
+      // { imports = [ ./cluster.nix  (./hw + "/${x.name}.nix") ]; };
   };
 
 in
   builtins.foldl' (a: x: a // mkNode x) {
-    "${master.node.name}" = master;
+    "${master.features.k8s.host.name}" = master;
   } nodes