Merge pull request kubernetes#74925 from lee0c/windows-dns-config-tests

Windows dns config test

Author: k8s-ci-robot

test/e2e/windows/BUILD

@@ -6,6 +6,7 @@ go_library(
     name = "go_default_library",
     srcs = [
         "density.go",
+        "dns.go",
         "framework.go",
         "gmsa.go",
         "hybrid_network.go",

test/e2e/windows/dns.go

@@ -0,0 +1,112 @@
+/*
+Copyright 2019 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 windows
+
+import (
+	"regexp"
+	"strings"
+
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/kubernetes/test/e2e/framework"
+	e2elog "k8s.io/kubernetes/test/e2e/framework/log"
+	imageutils "k8s.io/kubernetes/test/utils/image"
+
+	"github.com/onsi/ginkgo"
+)
+
+const dnsTestPodHostName = "dns-querier-1"
+const dnsTestServiceName = "dns-test-service"
+
+var _ = SIGDescribe("DNS", func() {
+
+	ginkgo.BeforeEach(func() {
+		framework.SkipUnlessNodeOSDistroIs("windows")
+	})
+
+	f := framework.NewDefaultFramework("dns")
+
+	ginkgo.It("should support configurable pod DNS servers", func() {
+		ginkgo.By("Preparing a test DNS service with injected DNS names...")
+		testInjectedIP := "1.1.1.1"
+		testSearchPath := "resolv.conf.local"
+
+		ginkgo.By("Creating a pod with dnsPolicy=None and customized dnsConfig...")
+		testUtilsPod := generateDNSUtilsPod()
+		testUtilsPod.Spec.DNSPolicy = v1.DNSNone
+		testUtilsPod.Spec.DNSConfig = &v1.PodDNSConfig{
+			Nameservers: []string{testInjectedIP},
+			Searches:    []string{testSearchPath},
+		}
+		testUtilsPod, err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Create(testUtilsPod)
+		framework.ExpectNoError(err)
+		e2elog.Logf("Created pod %v", testUtilsPod)
+		defer func() {
+			e2elog.Logf("Deleting pod %s...", testUtilsPod.Name)
+			if err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Delete(testUtilsPod.Name, metav1.NewDeleteOptions(0)); err != nil {
+				e2elog.Failf("Failed to delete pod %s: %v", testUtilsPod.Name, err)
+			}
+		}()
+		framework.ExpectNoError(f.WaitForPodRunning(testUtilsPod.Name), "failed to wait for pod %s to be running", testUtilsPod.Name)
+
+		ginkgo.By("Verifying customized DNS option is configured on pod...")
+		cmd := []string{"ipconfig", "/all"}
+		stdout, _, err := f.ExecWithOptions(framework.ExecOptions{
+			Command:       cmd,
+			Namespace:     f.Namespace.Name,
+			PodName:       testUtilsPod.Name,
+			ContainerName: "util",
+			CaptureStdout: true,
+			CaptureStderr: true,
+		})
+		framework.ExpectNoError(err)
+
+		e2elog.Logf("ipconfig /all:\n%s", stdout)
+		dnsRegex, err := regexp.Compile(`DNS Servers[\s*.]*:(\s*[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})+`)
+
+		if dnsRegex.MatchString(stdout) {
+			match := dnsRegex.FindString(stdout)
+
+			if !strings.Contains(match, testInjectedIP) {
+				e2elog.Failf("customized DNS options not found in ipconfig /all, got: %s", match)
+			}
+		} else {
+			e2elog.Failf("cannot find DNS server info in ipconfig /all output: \n%s", stdout)
+		}
+		// TODO: Add more test cases for other DNSPolicies.
+	})
+})
+
+func generateDNSUtilsPod() *v1.Pod {
+	return &v1.Pod{
+		TypeMeta: metav1.TypeMeta{
+			Kind: "Pod",
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			GenerateName: "e2e-dns-utils-",
+		},
+		Spec: v1.PodSpec{
+			Containers: []v1.Container{
+				{
+					Name:    "util",
+					Image:   imageutils.GetE2EImage(imageutils.Dnsutils),
+					Command: []string{"sleep", "10000"},
+				},
+			},
+		},
+	}
+}