Merge pull request kubernetes#95907 from aojea/testdualslices

dualstack endpoints integration tests

Author: k8s-ci-robot

test/integration/dualstack/BUILD

@@ -3,18 +3,23 @@ load("@io_bazel_rules_go//go:def.bzl", "go_test")
 go_test(
     name = "go_default_test",
     srcs = [
+        "dualstack_endpoints_test.go",
         "dualstack_test.go",
         "main_test.go",
     ],
     tags = ["integration"],
     deps = [
+        "//pkg/controller/endpoint:go_default_library",
+        "//pkg/controller/endpointslice:go_default_library",
         "//pkg/features:go_default_library",
         "//staging/src/k8s.io/api/core/v1:go_default_library",
+        "//staging/src/k8s.io/api/discovery/v1beta1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/api/errors:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/intstr:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/wait:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/util/feature:go_default_library",
+        "//staging/src/k8s.io/client-go/informers:go_default_library",
         "//staging/src/k8s.io/client-go/kubernetes:go_default_library",
         "//staging/src/k8s.io/client-go/rest:go_default_library",
         "//staging/src/k8s.io/component-base/featuregate/testing:go_default_library",

test/integration/dualstack/dualstack_endpoints_test.go

@@ -0,0 +1,292 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package dualstack
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"testing"
+	"time"
+
+	v1 "k8s.io/api/core/v1"
+	discovery "k8s.io/api/discovery/v1beta1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/intstr"
+	"k8s.io/apimachinery/pkg/util/wait"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	"k8s.io/client-go/informers"
+	clientset "k8s.io/client-go/kubernetes"
+	restclient "k8s.io/client-go/rest"
+	featuregatetesting "k8s.io/component-base/featuregate/testing"
+	"k8s.io/kubernetes/pkg/controller/endpoint"
+	"k8s.io/kubernetes/pkg/controller/endpointslice"
+	"k8s.io/kubernetes/pkg/features"
+	"k8s.io/kubernetes/test/integration/framework"
+)
+
+func TestDualStackEndpoints(t *testing.T) {
+	// Create an IPv4IPv6 dual stack control-plane
+	serviceCIDR := "10.0.0.0/16"
+	secondaryServiceCIDR := "2001:db8:1::/48"
+	labelMap := func() map[string]string {
+		return map[string]string{"foo": "bar"}
+	}
+
+	dualStack := true
+	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.IPv6DualStack, dualStack)()
+
+	cfg := framework.NewIntegrationTestMasterConfig()
+	_, cidr, err := net.ParseCIDR(serviceCIDR)
+	if err != nil {
+		t.Fatalf("Bad cidr: %v", err)
+	}
+	cfg.ExtraConfig.ServiceIPRange = *cidr
+
+	_, secCidr, err := net.ParseCIDR(secondaryServiceCIDR)
+	if err != nil {
+		t.Fatalf("Bad cidr: %v", err)
+	}
+	cfg.ExtraConfig.SecondaryServiceIPRange = *secCidr
+
+	_, s, closeFn := framework.RunAMaster(cfg)
+	defer closeFn()
+
+	client := clientset.NewForConfigOrDie(&restclient.Config{Host: s.URL})
+
+	// Wait until the default "kubernetes" service is created.
+	if err = wait.Poll(250*time.Millisecond, time.Minute, func() (bool, error) {
+		_, err := client.CoreV1().Services(metav1.NamespaceDefault).Get(context.TODO(), "kubernetes", metav1.GetOptions{})
+		if err != nil && !apierrors.IsNotFound(err) {
+			return false, err
+		}
+		return !apierrors.IsNotFound(err), nil
+	}); err != nil {
+		t.Fatalf("Creating kubernetes service timed out")
+	}
+
+	resyncPeriod := 0 * time.Hour
+	informers := informers.NewSharedInformerFactory(client, resyncPeriod)
+
+	// Create fake node
+	testNode := &v1.Node{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "fakenode",
+		},
+		Spec: v1.NodeSpec{Unschedulable: false},
+		Status: v1.NodeStatus{
+			Conditions: []v1.NodeCondition{
+				{
+					Type:              v1.NodeReady,
+					Status:            v1.ConditionTrue,
+					Reason:            fmt.Sprintf("schedulable condition"),
+					LastHeartbeatTime: metav1.Time{Time: time.Now()},
+				},
+			},
+		},
+	}
+	if _, err := client.CoreV1().Nodes().Create(context.TODO(), testNode, metav1.CreateOptions{}); err != nil {
+		t.Fatalf("Failed to create Node %q: %v", testNode.Name, err)
+	}
+
+	epController := endpoint.NewEndpointController(
+		informers.Core().V1().Pods(),
+		informers.Core().V1().Services(),
+		informers.Core().V1().Endpoints(),
+		client,
+		1*time.Second)
+
+	epsController := endpointslice.NewController(
+		informers.Core().V1().Pods(),
+		informers.Core().V1().Services(),
+		informers.Core().V1().Nodes(),
+		informers.Discovery().V1beta1().EndpointSlices(),
+		int32(100),
+		client,
+		1*time.Second)
+
+	// Start informer and controllers
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+	informers.Start(stopCh)
+	// use only one worker to serialize the updates
+	go epController.Run(1, stopCh)
+	go epsController.Run(1, stopCh)
+
+	var testcases = []struct {
+		name           string
+		serviceType    v1.ServiceType
+		ipFamilies     []v1.IPFamily
+		ipFamilyPolicy v1.IPFamilyPolicyType
+	}{
+		{
+			name:           "Service IPv4 Only",
+			serviceType:    v1.ServiceTypeClusterIP,
+			ipFamilies:     []v1.IPFamily{v1.IPv4Protocol},
+			ipFamilyPolicy: v1.IPFamilyPolicySingleStack,
+		},
+		{
+			name:           "Service IPv6 Only",
+			serviceType:    v1.ServiceTypeClusterIP,
+			ipFamilies:     []v1.IPFamily{v1.IPv6Protocol},
+			ipFamilyPolicy: v1.IPFamilyPolicySingleStack,
+		},
+		{
+			name:           "Service IPv6 IPv4 Dual Stack",
+			serviceType:    v1.ServiceTypeClusterIP,
+			ipFamilies:     []v1.IPFamily{v1.IPv6Protocol, v1.IPv4Protocol},
+			ipFamilyPolicy: v1.IPFamilyPolicyRequireDualStack,
+		},
+		{
+			name:           "Service IPv4 IPv6 Dual Stack",
+			serviceType:    v1.ServiceTypeClusterIP,
+			ipFamilies:     []v1.IPFamily{v1.IPv4Protocol, v1.IPv6Protocol},
+			ipFamilyPolicy: v1.IPFamilyPolicyRequireDualStack,
+		},
+	}
+
+	for i, tc := range testcases {
+		t.Run(tc.name, func(t *testing.T) {
+			ns := framework.CreateTestingNamespace(fmt.Sprintf("test-endpointslice-dualstack-%d", i), s, t)
+			defer framework.DeleteTestingNamespace(ns, s, t)
+
+			// Create a pod with labels
+			pod := &v1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "test-pod",
+					Namespace: ns.Name,
+					Labels:    labelMap(),
+				},
+				Spec: v1.PodSpec{
+					NodeName: "fakenode",
+					Containers: []v1.Container{
+						{
+							Name:  "fake-name",
+							Image: "fakeimage",
+						},
+					},
+				},
+			}
+
+			createdPod, err := client.CoreV1().Pods(ns.Name).Create(context.TODO(), pod, metav1.CreateOptions{})
+			if err != nil {
+				t.Fatalf("Failed to create pod %s: %v", pod.Name, err)
+			}
+
+			// Set pod IPs
+			podIPbyFamily := map[v1.IPFamily]string{v1.IPv4Protocol: "1.1.1.1", v1.IPv6Protocol: "2001:db2::65"}
+			createdPod.Status = v1.PodStatus{
+				Phase:  v1.PodRunning,
+				PodIPs: []v1.PodIP{{IP: podIPbyFamily[v1.IPv4Protocol]}, {IP: podIPbyFamily[v1.IPv6Protocol]}},
+			}
+			_, err = client.CoreV1().Pods(ns.Name).UpdateStatus(context.TODO(), createdPod, metav1.UpdateOptions{})
+			if err != nil {
+				t.Fatalf("Failed to update status of pod %s: %v", pod.Name, err)
+			}
+
+			svc := &v1.Service{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      fmt.Sprintf("svc-test-%d", i), // use different services for each test
+					Namespace: ns.Name,
+					Labels:    labelMap(),
+				},
+				Spec: v1.ServiceSpec{
+					Type:           v1.ServiceTypeClusterIP,
+					IPFamilies:     tc.ipFamilies,
+					IPFamilyPolicy: &tc.ipFamilyPolicy,
+					Selector:       labelMap(),
+					Ports: []v1.ServicePort{
+						{
+							Name:       fmt.Sprintf("port-test-%d", i),
+							Port:       443,
+							TargetPort: intstr.IntOrString{IntVal: 443},
+							Protocol:   "TCP",
+						},
+					},
+				},
+			}
+
+			// create a service
+			_, err = client.CoreV1().Services(ns.Name).Create(context.TODO(), svc, metav1.CreateOptions{})
+			if err != nil {
+				t.Fatalf("Error creating service: %v", err)
+			}
+
+			// wait until endpoints are created
+			// legacy endpoints are not dual stack
+			// and use the address of the first IP family
+			if err := wait.PollImmediate(1*time.Second, wait.ForeverTestTimeout, func() (bool, error) {
+				e, err := client.CoreV1().Endpoints(ns.Name).Get(context.TODO(), svc.Name, metav1.GetOptions{})
+				if err != nil {
+					t.Logf("Error fetching endpoints: %v", err)
+					return false, nil
+				}
+				// check if the endpoint addresses match the pod IP of the first IPFamily of the service
+				// since this is an integration test PodIPs are not "ready"
+				if len(e.Subsets) > 0 && len(e.Subsets[0].NotReadyAddresses) > 0 {
+					if e.Subsets[0].NotReadyAddresses[0].IP == podIPbyFamily[tc.ipFamilies[0]] {
+						return true, nil
+					}
+					t.Logf("Endpoint address %s does not match PodIP %s ", e.Subsets[0].Addresses[0].IP, podIPbyFamily[tc.ipFamilies[0]])
+				}
+				t.Logf("Endpoint does not contain addresses: %s", e.Name)
+				return false, nil
+			}); err != nil {
+				t.Fatalf("Endpoints not found: %v", err)
+			}
+
+			// wait until the endpoint slices are created
+			err = wait.PollImmediate(1*time.Second, wait.ForeverTestTimeout, func() (bool, error) {
+				lSelector := discovery.LabelServiceName + "=" + svc.Name
+				esList, err := client.DiscoveryV1beta1().EndpointSlices(ns.Name).List(context.TODO(), metav1.ListOptions{LabelSelector: lSelector})
+				if err != nil {
+					t.Logf("Error listing EndpointSlices: %v", err)
+					return false, nil
+				}
+				// there must be an endpoint slice per ipFamily
+				if len(esList.Items) != len(tc.ipFamilies) {
+					t.Logf("Waiting for EndpointSlice to be created %v", esList)
+					return false, nil
+				}
+				// there must be an endpoint address per each IP family
+				for _, ipFamily := range tc.ipFamilies {
+					found := false
+					for _, slice := range esList.Items {
+						// check if the endpoint addresses match the pod IPs
+						if len(slice.Endpoints) > 0 && len(slice.Endpoints[0].Addresses) > 0 {
+							if string(ipFamily) == string(slice.AddressType) &&
+								slice.Endpoints[0].Addresses[0] == podIPbyFamily[ipFamily] {
+								found = true
+								break
+							}
+						}
+						t.Logf("Waiting endpoint slice to contain addresses")
+					}
+					if !found {
+						t.Logf("Endpoint slices does not contain PodIP %s", podIPbyFamily[ipFamily])
+						return false, nil
+					}
+				}
+				return true, nil
+			})
+			if err != nil {
+				t.Fatalf("Error waiting for endpoint slices: %v", err)
+			}
+		})
+	}
+}