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dualstack endpoints integration tests

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add integration tests to verify the behaviour of the endpoints
and endpointslices controller with dual stack services.

Since services can be single or dual stack, endpoints should be
generated for each IP family in the endpoint slice controller.

The legacy endpoint controller only will generate endpoints
in the first IP family configured in the service.

integration fix
This commit is contained in:
Antonio Ojea 2020-09-29 22:46:40 +02:00
parent 1f0371bb3f
commit 6526714e9a
2 changed files with 297 additions and 0 deletions
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5
test/integration/dualstack/BUILD
View File

@ -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",

292
test/integration/dualstack/dualstack_endpoints_test.go Normal file
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@ -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)
}
})
}
}