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392 lines
14 KiB
Go
392 lines
14 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package e2e
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import (
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"fmt"
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"strings"
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"time"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/pod"
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"k8s.io/kubernetes/pkg/api/unversioned"
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"k8s.io/kubernetes/pkg/apimachinery/registered"
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client "k8s.io/kubernetes/pkg/client/unversioned"
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"k8s.io/kubernetes/pkg/labels"
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"k8s.io/kubernetes/pkg/util/uuid"
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"k8s.io/kubernetes/pkg/util/wait"
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"k8s.io/kubernetes/test/e2e/framework"
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)
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const dnsTestPodHostName = "dns-querier-1"
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const dnsTestServiceName = "dns-test-service"
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var dnsServiceLabelSelector = labels.Set{
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"k8s-app": "kube-dns",
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"kubernetes.io/cluster-service": "true",
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}.AsSelector()
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func createDNSPod(namespace, wheezyProbeCmd, jessieProbeCmd string, useAnnotation bool) *api.Pod {
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dnsPod := &api.Pod{
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TypeMeta: unversioned.TypeMeta{
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Kind: "Pod",
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APIVersion: registered.GroupOrDie(api.GroupName).GroupVersion.String(),
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},
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ObjectMeta: api.ObjectMeta{
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Name: "dns-test-" + string(uuid.NewUUID()),
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Namespace: namespace,
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},
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Spec: api.PodSpec{
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Volumes: []api.Volume{
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{
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Name: "results",
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VolumeSource: api.VolumeSource{
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EmptyDir: &api.EmptyDirVolumeSource{},
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},
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},
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},
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Containers: []api.Container{
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// TODO: Consider scraping logs instead of running a webserver.
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{
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Name: "webserver",
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Image: "gcr.io/google_containers/test-webserver:e2e",
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Ports: []api.ContainerPort{
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{
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Name: "http",
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ContainerPort: 80,
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},
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},
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VolumeMounts: []api.VolumeMount{
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{
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Name: "results",
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MountPath: "/results",
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},
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},
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},
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{
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Name: "querier",
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Image: "gcr.io/google_containers/dnsutils:e2e",
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Command: []string{"sh", "-c", wheezyProbeCmd},
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VolumeMounts: []api.VolumeMount{
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{
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Name: "results",
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MountPath: "/results",
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},
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},
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},
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{
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Name: "jessie-querier",
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Image: "gcr.io/google_containers/jessie-dnsutils:e2e",
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Command: []string{"sh", "-c", jessieProbeCmd},
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VolumeMounts: []api.VolumeMount{
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{
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Name: "results",
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MountPath: "/results",
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},
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},
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},
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},
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},
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}
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if useAnnotation {
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dnsPod.ObjectMeta.Annotations = map[string]string{
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pod.PodHostnameAnnotation: dnsTestPodHostName,
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pod.PodSubdomainAnnotation: dnsTestServiceName,
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}
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} else {
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dnsPod.Spec.Hostname = dnsTestPodHostName
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dnsPod.Spec.Subdomain = dnsTestServiceName
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}
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return dnsPod
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}
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func createProbeCommand(namesToResolve []string, hostEntries []string, ptrLookupIP string, fileNamePrefix, namespace string) (string, []string) {
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fileNames := make([]string, 0, len(namesToResolve)*2)
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probeCmd := "for i in `seq 1 600`; do "
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for _, name := range namesToResolve {
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// Resolve by TCP and UDP DNS. Use $$(...) because $(...) is
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// expanded by kubernetes (though this won't expand so should
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// remain a literal, safe > sorry).
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lookup := "A"
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if strings.HasPrefix(name, "_") {
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lookup = "SRV"
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}
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fileName := fmt.Sprintf("%s_udp@%s", fileNamePrefix, name)
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fileNames = append(fileNames, fileName)
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probeCmd += fmt.Sprintf(`test -n "$$(dig +notcp +noall +answer +search %s %s)" && echo OK > /results/%s;`, name, lookup, fileName)
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fileName = fmt.Sprintf("%s_tcp@%s", fileNamePrefix, name)
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fileNames = append(fileNames, fileName)
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probeCmd += fmt.Sprintf(`test -n "$$(dig +tcp +noall +answer +search %s %s)" && echo OK > /results/%s;`, name, lookup, fileName)
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}
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for _, name := range hostEntries {
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fileName := fmt.Sprintf("%s_hosts@%s", fileNamePrefix, name)
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fileNames = append(fileNames, fileName)
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probeCmd += fmt.Sprintf(`test -n "$$(getent hosts %s)" && echo OK > /results/%s;`, name, fileName)
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}
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podARecByUDPFileName := fmt.Sprintf("%s_udp@PodARecord", fileNamePrefix)
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podARecByTCPFileName := fmt.Sprintf("%s_tcp@PodARecord", fileNamePrefix)
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probeCmd += fmt.Sprintf(`podARec=$$(hostname -i| awk -F. '{print $$1"-"$$2"-"$$3"-"$$4".%s.pod.cluster.local"}');`, namespace)
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probeCmd += fmt.Sprintf(`test -n "$$(dig +notcp +noall +answer +search $${podARec} A)" && echo OK > /results/%s;`, podARecByUDPFileName)
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probeCmd += fmt.Sprintf(`test -n "$$(dig +tcp +noall +answer +search $${podARec} A)" && echo OK > /results/%s;`, podARecByTCPFileName)
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fileNames = append(fileNames, podARecByUDPFileName)
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fileNames = append(fileNames, podARecByTCPFileName)
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if len(ptrLookupIP) > 0 {
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ptrLookup := fmt.Sprintf("%s.in-addr.arpa.", strings.Join(reverseArray(strings.Split(ptrLookupIP, ".")), "."))
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ptrRecByUDPFileName := fmt.Sprintf("%s_udp@PTR", ptrLookupIP)
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ptrRecByTCPFileName := fmt.Sprintf("%s_tcp@PTR", ptrLookupIP)
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probeCmd += fmt.Sprintf(`test -n "$$(dig +notcp +noall +answer +search %s PTR)" && echo OK > /results/%s;`, ptrLookup, ptrRecByUDPFileName)
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probeCmd += fmt.Sprintf(`test -n "$$(dig +tcp +noall +answer +search %s PTR)" && echo OK > /results/%s;`, ptrLookup, ptrRecByTCPFileName)
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fileNames = append(fileNames, ptrRecByUDPFileName)
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fileNames = append(fileNames, ptrRecByTCPFileName)
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}
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probeCmd += "sleep 1; done"
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return probeCmd, fileNames
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}
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func assertFilesExist(fileNames []string, fileDir string, pod *api.Pod, client *client.Client) {
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var failed []string
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framework.ExpectNoError(wait.Poll(time.Second*2, time.Second*60, func() (bool, error) {
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failed = []string{}
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subResourceProxyAvailable, err := framework.ServerVersionGTE(framework.SubResourcePodProxyVersion, client)
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if err != nil {
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return false, err
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}
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for _, fileName := range fileNames {
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if subResourceProxyAvailable {
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_, err = client.Get().
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Namespace(pod.Namespace).
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Resource("pods").
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SubResource("proxy").
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Name(pod.Name).
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Suffix(fileDir, fileName).
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Do().Raw()
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} else {
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_, err = client.Get().
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Prefix("proxy").
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Resource("pods").
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Namespace(pod.Namespace).
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Name(pod.Name).
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Suffix(fileDir, fileName).
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Do().Raw()
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}
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if err != nil {
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framework.Logf("Unable to read %s from pod %s: %v", fileName, pod.Name, err)
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failed = append(failed, fileName)
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}
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}
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if len(failed) == 0 {
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return true, nil
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}
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framework.Logf("Lookups using %s failed for: %v\n", pod.Name, failed)
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return false, nil
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}))
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Expect(len(failed)).To(Equal(0))
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}
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func validateDNSResults(f *framework.Framework, pod *api.Pod, fileNames []string) {
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By("submitting the pod to kubernetes")
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podClient := f.Client.Pods(f.Namespace.Name)
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defer func() {
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By("deleting the pod")
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defer GinkgoRecover()
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podClient.Delete(pod.Name, api.NewDeleteOptions(0))
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}()
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if _, err := podClient.Create(pod); err != nil {
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framework.Failf("Failed to create %s pod: %v", pod.Name, err)
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}
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framework.ExpectNoError(f.WaitForPodRunning(pod.Name))
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By("retrieving the pod")
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pod, err := podClient.Get(pod.Name)
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if err != nil {
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framework.Failf("Failed to get pod %s: %v", pod.Name, err)
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}
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// Try to find results for each expected name.
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By("looking for the results for each expected name from probiers")
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assertFilesExist(fileNames, "results", pod, f.Client)
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// TODO: probe from the host, too.
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framework.Logf("DNS probes using %s succeeded\n", pod.Name)
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}
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func verifyDNSPodIsRunning(f *framework.Framework) {
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systemClient := f.Client.Pods(api.NamespaceSystem)
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By("Waiting for DNS Service to be Running")
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options := api.ListOptions{LabelSelector: dnsServiceLabelSelector}
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dnsPods, err := systemClient.List(options)
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if err != nil {
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framework.Failf("Failed to list all dns service pods")
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}
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if len(dnsPods.Items) < 1 {
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framework.Failf("No pods match the label selector %v", dnsServiceLabelSelector.String())
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}
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pod := dnsPods.Items[0]
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framework.ExpectNoError(framework.WaitForPodRunningInNamespace(f.Client, &pod))
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}
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func createServiceSpec(serviceName string, isHeadless bool, selector map[string]string) *api.Service {
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headlessService := &api.Service{
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ObjectMeta: api.ObjectMeta{
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Name: serviceName,
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},
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Spec: api.ServiceSpec{
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Ports: []api.ServicePort{
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{Port: 80, Name: "http", Protocol: "TCP"},
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},
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Selector: selector,
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},
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}
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if isHeadless {
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headlessService.Spec.ClusterIP = "None"
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}
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return headlessService
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}
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func reverseArray(arr []string) []string {
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for i := 0; i < len(arr)/2; i++ {
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j := len(arr) - i - 1
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arr[i], arr[j] = arr[j], arr[i]
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}
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return arr
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}
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var _ = framework.KubeDescribe("DNS", func() {
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f := framework.NewDefaultFramework("dns")
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It("should provide DNS for the cluster [Conformance]", func() {
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// All the names we need to be able to resolve.
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// TODO: Spin up a separate test service and test that dns works for that service.
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namesToResolve := []string{
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"kubernetes.default",
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"kubernetes.default.svc",
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"kubernetes.default.svc.cluster.local",
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"google.com",
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}
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// Added due to #8512. This is critical for GCE and GKE deployments.
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if framework.ProviderIs("gce", "gke") {
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namesToResolve = append(namesToResolve, "metadata")
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}
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hostFQDN := fmt.Sprintf("%s.%s.%s.svc.cluster.local", dnsTestPodHostName, dnsTestServiceName, f.Namespace.Name)
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hostEntries := []string{hostFQDN, dnsTestPodHostName}
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wheezyProbeCmd, wheezyFileNames := createProbeCommand(namesToResolve, hostEntries, "", "wheezy", f.Namespace.Name)
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jessieProbeCmd, jessieFileNames := createProbeCommand(namesToResolve, hostEntries, "", "jessie", f.Namespace.Name)
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By("Running these commands on wheezy:" + wheezyProbeCmd + "\n")
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By("Running these commands on jessie:" + jessieProbeCmd + "\n")
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// Run a pod which probes DNS and exposes the results by HTTP.
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By("creating a pod to probe DNS")
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pod := createDNSPod(f.Namespace.Name, wheezyProbeCmd, jessieProbeCmd, true)
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validateDNSResults(f, pod, append(wheezyFileNames, jessieFileNames...))
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})
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It("should provide DNS for services [Conformance]", func() {
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// Create a test headless service.
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By("Creating a test headless service")
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testServiceSelector := map[string]string{
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"dns-test": "true",
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}
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headlessService := createServiceSpec(dnsTestServiceName, true, testServiceSelector)
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_, err := f.Client.Services(f.Namespace.Name).Create(headlessService)
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Expect(err).NotTo(HaveOccurred())
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defer func() {
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By("deleting the test headless service")
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defer GinkgoRecover()
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f.Client.Services(f.Namespace.Name).Delete(headlessService.Name)
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}()
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regularService := createServiceSpec("test-service-2", false, testServiceSelector)
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regularService, err = f.Client.Services(f.Namespace.Name).Create(regularService)
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Expect(err).NotTo(HaveOccurred())
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defer func() {
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By("deleting the test service")
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defer GinkgoRecover()
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f.Client.Services(f.Namespace.Name).Delete(regularService.Name)
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}()
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// All the names we need to be able to resolve.
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// TODO: Create more endpoints and ensure that multiple A records are returned
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// for headless service.
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namesToResolve := []string{
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fmt.Sprintf("%s", headlessService.Name),
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fmt.Sprintf("%s.%s", headlessService.Name, f.Namespace.Name),
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fmt.Sprintf("%s.%s.svc", headlessService.Name, f.Namespace.Name),
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fmt.Sprintf("_http._tcp.%s.%s.svc", headlessService.Name, f.Namespace.Name),
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fmt.Sprintf("_http._tcp.%s.%s.svc", regularService.Name, f.Namespace.Name),
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}
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wheezyProbeCmd, wheezyFileNames := createProbeCommand(namesToResolve, nil, regularService.Spec.ClusterIP, "wheezy", f.Namespace.Name)
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jessieProbeCmd, jessieFileNames := createProbeCommand(namesToResolve, nil, regularService.Spec.ClusterIP, "jessie", f.Namespace.Name)
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By("Running these commands on wheezy:" + wheezyProbeCmd + "\n")
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By("Running these commands on jessie:" + jessieProbeCmd + "\n")
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// Run a pod which probes DNS and exposes the results by HTTP.
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By("creating a pod to probe DNS")
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pod := createDNSPod(f.Namespace.Name, wheezyProbeCmd, jessieProbeCmd, false)
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pod.ObjectMeta.Labels = testServiceSelector
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validateDNSResults(f, pod, append(wheezyFileNames, jessieFileNames...))
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})
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It("should provide DNS for pods for Hostname and Subdomain Annotation", func() {
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// Create a test headless service.
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By("Creating a test headless service")
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testServiceSelector := map[string]string{
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"dns-test-hostname-attribute": "true",
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}
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serviceName := "dns-test-service-2"
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podHostname := "dns-querier-2"
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headlessService := createServiceSpec(serviceName, true, testServiceSelector)
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_, err := f.Client.Services(f.Namespace.Name).Create(headlessService)
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Expect(err).NotTo(HaveOccurred())
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defer func() {
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By("deleting the test headless service")
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defer GinkgoRecover()
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f.Client.Services(f.Namespace.Name).Delete(headlessService.Name)
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}()
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hostFQDN := fmt.Sprintf("%s.%s.%s.svc.cluster.local", podHostname, serviceName, f.Namespace.Name)
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hostNames := []string{hostFQDN, podHostname}
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namesToResolve := []string{hostFQDN}
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wheezyProbeCmd, wheezyFileNames := createProbeCommand(namesToResolve, hostNames, "", "wheezy", f.Namespace.Name)
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jessieProbeCmd, jessieFileNames := createProbeCommand(namesToResolve, hostNames, "", "jessie", f.Namespace.Name)
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By("Running these commands on wheezy:" + wheezyProbeCmd + "\n")
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By("Running these commands on jessie:" + jessieProbeCmd + "\n")
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// Run a pod which probes DNS and exposes the results by HTTP.
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By("creating a pod to probe DNS")
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pod1 := createDNSPod(f.Namespace.Name, wheezyProbeCmd, jessieProbeCmd, true)
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pod1.ObjectMeta.Labels = testServiceSelector
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pod1.ObjectMeta.Annotations = map[string]string{
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pod.PodHostnameAnnotation: podHostname,
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pod.PodSubdomainAnnotation: serviceName,
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}
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validateDNSResults(f, pod1, append(wheezyFileNames, jessieFileNames...))
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})
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})
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