[Federation] Make the dnsProvider configurable in kubefed init

federation/pkg/kubefed/init/init.go

@@ -118,6 +118,7 @@ func NewCmdInit(cmdOut io.Writer, config util.AdminConfig) *cobra.Command {
 	util.AddSubcommandFlags(cmd)
 	cmd.Flags().String("dns-zone-name", "", "DNS suffix for this federation. Federated Service DNS names are published with this suffix.")
 	cmd.Flags().String("image", defaultImage, "Image to use for federation API server and controller manager binaries.")
+	cmd.Flags().String("dns-provider", "google-clouddns", "Dns provider to be used for this deployment.")
 	return cmd
 }
 
@@ -138,6 +139,7 @@ func initFederation(cmdOut io.Writer, config util.AdminConfig, cmd *cobra.Comman
 	}
 	dnsZoneName := cmdutil.GetFlagString(cmd, "dns-zone-name")
 	image := cmdutil.GetFlagString(cmd, "image")
+	dnsProvider := cmdutil.GetFlagString(cmd, "dns-provider")
 
 	hostFactory := config.HostFactory(initFlags.Host, initFlags.Kubeconfig)
 	hostClientset, err := hostFactory.ClientSet()
@@ -210,7 +212,7 @@ func initFederation(cmdOut io.Writer, config util.AdminConfig, cmd *cobra.Comman
 	}
 
 	// 7. Create federation controller manager
-	_, err = createControllerManager(hostClientset, initFlags.FederationSystemNamespace, initFlags.Name, cmName, image, cmKubeconfigName, dnsZoneName)
+	_, err = createControllerManager(hostClientset, initFlags.FederationSystemNamespace, initFlags.Name, cmName, image, cmKubeconfigName, dnsZoneName, dnsProvider)
 	if err != nil {
 		return err
 	}
@@ -479,7 +481,7 @@ func createAPIServer(clientset *client.Clientset, namespace, name, image, creden
 	return clientset.Extensions().Deployments(namespace).Create(dep)
 }
 
-func createControllerManager(clientset *client.Clientset, namespace, name, cmName, image, kubeconfigName, dnsZoneName string) (*extensions.Deployment, error) {
+func createControllerManager(clientset *client.Clientset, namespace, name, cmName, image, kubeconfigName, dnsZoneName, dnsProvider string) (*extensions.Deployment, error) {
 	dep := &extensions.Deployment{
 		ObjectMeta: api.ObjectMeta{
 			Name:      cmName,
@@ -503,7 +505,7 @@ func createControllerManager(clientset *client.Clientset, namespace, name, cmNam
 								"federation-controller-manager",
 								"--master=https://federation-apiserver",
 								"--kubeconfig=/etc/federation/controller-manager/kubeconfig",
-								"--dns-provider=gce",
+								fmt.Sprintf("--dns-provider=%s", dnsProvider),
 								"--dns-provider-config=",
 								fmt.Sprintf("--federation-name=%s", name),
 								fmt.Sprintf("--zone-name=%s", dnsZoneName),