Fix kube config for backend and frontend config CRDs

cmd/glbc/app/clients.go

@@ -44,18 +44,17 @@ const (
 	cloudClientRetryInterval = 10 * time.Second
 )
 
-// NewKubeConfig returns a Kubernetes client config given the command line settings.
-func NewKubeConfig() (*rest.Config, error) {
-	config, err := newKubeConfig()
-	if err != nil {
-		return nil, err
-	}
+// KubeConfigForProtobuf returns a shallow copy of client config after updating
+// content type to protobuf.
+func KubeConfigForProtobuf(kubeConfig *rest.Config) *rest.Config {
+	configShallowCopy := *kubeConfig
 	// Use protobufs for communication with apiserver
-	config.ContentType = "application/vnd.kubernetes.protobuf"
-	return config, nil
+	configShallowCopy.ContentType = "application/vnd.kubernetes.protobuf"
+	return &configShallowCopy
 }
 
-func newKubeConfig() (*rest.Config, error) {
+// NewKubeConfig returns a Kubernetes client config given the command line settings.
+func NewKubeConfig() (*rest.Config, error) {
 	if flags.F.InCluster {
 		klog.V(0).Infof("Using in cluster configuration")
 		return rest.InClusterConfig()

cmd/glbc/main.go

@@ -73,14 +73,15 @@ func main() {
 	if err != nil {
 		klog.Fatalf("Failed to create kubernetes client config: %v", err)
 	}
+	kubeConfigForProtobuf := app.KubeConfigForProtobuf(kubeConfig)
 
-	kubeClient, err := kubernetes.NewForConfig(kubeConfig)
+	kubeClient, err := kubernetes.NewForConfig(kubeConfigForProtobuf)
 	if err != nil {
 		klog.Fatalf("Failed to create kubernetes client: %v", err)
 	}
 
 	// Due to scaling issues, leader election must be configured with a separate k8s client.
-	leaderElectKubeClient, err := kubernetes.NewForConfig(restclient.AddUserAgent(kubeConfig, "leader-election"))
+	leaderElectKubeClient, err := kubernetes.NewForConfig(restclient.AddUserAgent(kubeConfigForProtobuf, "leader-election"))
 	if err != nil {
 		klog.Fatalf("Failed to create kubernetes client for leader election: %v", err)
 	}