Don't try to create routes for nodes w/o CIDRs assigned.

pkg/controller/route/routecontroller.go

@@ -75,6 +75,10 @@ func (rc *RouteController) reconcile(nodes []api.Node, routes []*cloudprovider.R
 		routeMap[route.TargetInstance] = route
 	}
 	for _, node := range nodes {
+		// Skip if the node hasn't been assigned a CIDR yet.
+		if node.Spec.PodCIDR == "" {
+			continue
+		}
 		// Check if we have a route for this node w/ the correct CIDR.
 		r := routeMap[node.Name]
 		if r == nil || r.DestinationCIDR != node.Spec.PodCIDR {

pkg/controller/route/routecontroller_test.go

@@ -145,6 +145,17 @@ func TestReconcile(t *testing.T) {
 				{cluster + "-02", "node-2", "10.120.1.0/24"},
 			},
 		},
+		// 2 nodes, one node without CIDR assigned.
+		{
+			nodes: []api.Node{
+				{ObjectMeta: api.ObjectMeta{Name: "node-1", UID: "01"}, Spec: api.NodeSpec{PodCIDR: "10.120.0.0/24"}},
+				{ObjectMeta: api.ObjectMeta{Name: "node-2", UID: "02"}, Spec: api.NodeSpec{PodCIDR: ""}},
+			},
+			initialRoutes: []*cloudprovider.Route{},
+			expectedRoutes: []*cloudprovider.Route{
+				{cluster + "-01", "node-1", "10.120.0.0/24"},
+			},
+		},
 	}
 	for i, testCase := range testCases {
 		cloud := &fakecloud.FakeCloud{RouteMap: make(map[string]*fakecloud.FakeRoute)}