Controller: Use Protocol Buffers for API access.

cmd/nginx/main.go

@@ -29,6 +29,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus/collectors"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	kuberuntime "k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/util/wait"
 	discovery "k8s.io/apimachinery/pkg/version"
 	"k8s.io/client-go/kubernetes"
@@ -202,6 +203,8 @@ func createApiserverClient(apiserverHost, rootCAFile, kubeConfig string) (*kuber
 		cfg.TLSClientConfig = tlsClientConfig
 	}
 
+	cfg.ContentType = kuberuntime.ContentTypeProtobuf
+
 	klog.InfoS("Creating API client", "host", cfg.Host)
 
 	client, err := kubernetes.NewForConfig(cfg)

cmd/plugin/request/request.go

@@ -25,6 +25,7 @@ import (
 	discoveryv1 "k8s.io/api/discovery/v1"
 	networking "k8s.io/api/networking/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/cli-runtime/pkg/genericclioptions"
 	appsv1client "k8s.io/client-go/kubernetes/typed/apps/v1"
 	corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
@@ -97,6 +98,7 @@ func GetDeployments(flags *genericclioptions.ConfigFlags, namespace string) ([]a
 	if err != nil {
 		return make([]appsv1.Deployment, 0), err
 	}
+	rawConfig.ContentType = runtime.ContentTypeProtobuf
 
 	api, err := appsv1client.NewForConfig(rawConfig)
 	if err != nil {
@@ -117,6 +119,7 @@ func GetIngressDefinitions(flags *genericclioptions.ConfigFlags, namespace strin
 	if err != nil {
 		return make([]networking.Ingress, 0), err
 	}
+	rawConfig.ContentType = runtime.ContentTypeProtobuf
 
 	api, err := typednetworking.NewForConfig(rawConfig)
 	if err != nil {
@@ -193,6 +196,7 @@ func getEndpointSlices(flags *genericclioptions.ConfigFlags, namespace string) (
 	if err != nil {
 		return nil, err
 	}
+	rawConfig.ContentType = runtime.ContentTypeProtobuf
 
 	api, err := discoveryv1client.NewForConfig(rawConfig)
 	if err != nil {
@@ -259,6 +263,7 @@ func getPods(flags *genericclioptions.ConfigFlags) ([]apiv1.Pod, error) {
 	if err != nil {
 		return make([]apiv1.Pod, 0), err
 	}
+	rawConfig.ContentType = runtime.ContentTypeProtobuf
 
 	api, err := corev1.NewForConfig(rawConfig)
 	if err != nil {
@@ -280,6 +285,7 @@ func getLabeledPods(flags *genericclioptions.ConfigFlags, label string) ([]apiv1
 	if err != nil {
 		return make([]apiv1.Pod, 0), err
 	}
+	rawConfig.ContentType = runtime.ContentTypeProtobuf
 
 	api, err := corev1.NewForConfig(rawConfig)
 	if err != nil {
@@ -319,6 +325,7 @@ func getServices(flags *genericclioptions.ConfigFlags) ([]apiv1.Service, error)
 	if err != nil {
 		return make([]apiv1.Service, 0), err
 	}
+	rawConfig.ContentType = runtime.ContentTypeProtobuf
 
 	api, err := corev1.NewForConfig(rawConfig)
 	if err != nil {

images/kube-webhook-certgen/rootfs/cmd/root.go

@@ -6,7 +6,9 @@ import (
 	"github.com/onrik/logrus/filename"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
+	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/clientcmd"
 	"k8s.io/kube-aggregator/pkg/client/clientset_generated/clientset"
 )
@@ -88,8 +90,10 @@ func newKubernetesClients(kubeconfig string) (kubernetes.Interface, clientset.In
 	if err != nil {
 		log.WithError(err).Fatal("error building kubernetes config")
 	}
+	coreConfig := rest.CopyConfig(config)
+	coreConfig.ContentType = runtime.ContentTypeProtobuf
 
-	c, err := kubernetes.NewForConfig(config)
+	c, err := kubernetes.NewForConfig(coreConfig)
 	if err != nil {
 		log.WithError(err).Fatal("error creating kubernetes client")
 	}

internal/ingress/controller/store/store_test.go

@@ -32,6 +32,7 @@ import (
 	k8sErrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/tools/cache"
 	"sigs.k8s.io/controller-runtime/pkg/envtest"
@@ -98,6 +99,7 @@ func TestStore(t *testing.T) {
 
 	defer te.Stop() //nolint:errcheck // Ignore the error
 
+	cfg.ContentType = runtime.ContentTypeProtobuf
 	clientSet, err := kubernetes.NewForConfig(cfg)
 	if err != nil {
 		t.Fatalf("error: %v", err)

test/e2e/framework/framework.go

@@ -35,6 +35,7 @@ import (
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/fields"
+	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/kubernetes/scheme"
@@ -129,7 +130,9 @@ func (f *Framework) CreateEnvironment() {
 		// TODO: remove after k8s v1.22
 		f.KubeConfig.WarningHandler = rest.NoWarnings{}
 
-		f.KubeClientSet, err = kubernetes.NewForConfig(f.KubeConfig)
+		coreConfig := rest.CopyConfig(f.KubeConfig)
+		coreConfig.ContentType = runtime.ContentTypeProtobuf
+		f.KubeClientSet, err = kubernetes.NewForConfig(coreConfig)
 		assert.Nil(ginkgo.GinkgoT(), err, "creating a kubernetes client")
 	}