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Add e2e test for configurable pod resolv.conf
This commit is contained in:
Zihong Zheng
parent
9e5e0c6a59
commit
a042ee3456
@ -17,255 +17,22 @@ limitations under the License.
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package network
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import (
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"context"
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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/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/uuid"
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"k8s.io/apimachinery/pkg/util/wait"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/kubernetes/pkg/api/testapi"
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"k8s.io/kubernetes/test/e2e/framework"
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imageutils "k8s.io/kubernetes/test/utils/image"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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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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func createDNSPod(namespace, wheezyProbeCmd, jessieProbeCmd string) *v1.Pod {
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dnsPod := &v1.Pod{
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TypeMeta: metav1.TypeMeta{
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Kind: "Pod",
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APIVersion: testapi.Groups[v1.GroupName].GroupVersion().String(),
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},
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ObjectMeta: metav1.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: v1.PodSpec{
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Volumes: []v1.Volume{
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{
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Name: "results",
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VolumeSource: v1.VolumeSource{
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EmptyDir: &v1.EmptyDirVolumeSource{},
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},
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},
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},
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Containers: []v1.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: imageutils.GetE2EImage(imageutils.TestWebserver),
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Ports: []v1.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: []v1.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: imageutils.GetE2EImage(imageutils.Dnsutils),
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Command: []string{"sh", "-c", wheezyProbeCmd},
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VolumeMounts: []v1.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: imageutils.GetE2EImage(imageutils.JessieDnsutils),
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Command: []string{"sh", "-c", jessieProbeCmd},
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VolumeMounts: []v1.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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dnsPod.Spec.Hostname = dnsTestPodHostName
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dnsPod.Spec.Subdomain = dnsTestServiceName
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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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// createTargetedProbeCommand returns a command line that performs a DNS lookup for a specific record type
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func createTargetedProbeCommand(nameToResolve string, lookup string, fileNamePrefix string) (string, string) {
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fileName := fmt.Sprintf("%s_udp@%s", fileNamePrefix, nameToResolve)
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probeCmd := fmt.Sprintf("dig +short +tries=12 +norecurse %s %s > /results/%s", nameToResolve, lookup, fileName)
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return probeCmd, fileName
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}
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func assertFilesExist(fileNames []string, fileDir string, pod *v1.Pod, client clientset.Interface) {
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assertFilesContain(fileNames, fileDir, pod, client, false, "")
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}
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func assertFilesContain(fileNames []string, fileDir string, pod *v1.Pod, client clientset.Interface, check bool, expected string) {
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var failed []string
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framework.ExpectNoError(wait.Poll(time.Second*10, time.Second*600, func() (bool, error) {
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failed = []string{}
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ctx, cancel := context.WithTimeout(context.Background(), framework.SingleCallTimeout)
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defer cancel()
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for _, fileName := range fileNames {
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contents, err := client.CoreV1().RESTClient().Get().
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Context(ctx).
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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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if err != nil {
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if ctx.Err() != nil {
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framework.Failf("Unable to read %s from pod %s: %v", fileName, pod.Name, err)
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} else {
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framework.Logf("Unable to read %s from pod %s: %v", fileName, pod.Name, err)
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}
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failed = append(failed, fileName)
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} else if check && strings.TrimSpace(string(contents)) != expected {
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framework.Logf("File %s from pod %s contains '%s' instead of '%s'", fileName, pod.Name, string(contents), expected)
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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 *v1.Pod, fileNames []string) {
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By("submitting the pod to kubernetes")
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podClient := f.ClientSet.CoreV1().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, metav1.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, metav1.GetOptions{})
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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 probers")
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assertFilesExist(fileNames, "results", pod, f.ClientSet)
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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 validateTargetedProbeOutput(f *framework.Framework, pod *v1.Pod, fileNames []string, value string) {
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By("submitting the pod to kubernetes")
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podClient := f.ClientSet.CoreV1().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, metav1.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, metav1.GetOptions{})
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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 the expected value for each expected name.
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By("looking for the results for each expected name from probers")
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assertFilesContain(fileNames, "results", pod, f.ClientSet, true, value)
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framework.Logf("DNS probes using %s succeeded\n", pod.Name)
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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 _ = SIGDescribe("DNS", func() {
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f := framework.NewDefaultFramework("dns")
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@ -295,7 +62,7 @@ var _ = SIGDescribe("DNS", func() {
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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)
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pod := createDNSPod(f.Namespace.Name, wheezyProbeCmd, jessieProbeCmd, dnsTestPodHostName, dnsTestServiceName)
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validateDNSResults(f, pod, append(wheezyFileNames, jessieFileNames...))
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})
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@ -345,7 +112,7 @@ var _ = SIGDescribe("DNS", func() {
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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)
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pod := createDNSPod(f.Namespace.Name, wheezyProbeCmd, jessieProbeCmd, dnsTestPodHostName, dnsTestServiceName)
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pod.ObjectMeta.Labels = testServiceSelector
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validateDNSResults(f, pod, append(wheezyFileNames, jessieFileNames...))
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@ -378,7 +145,7 @@ var _ = SIGDescribe("DNS", func() {
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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)
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pod1 := createDNSPod(f.Namespace.Name, wheezyProbeCmd, jessieProbeCmd, dnsTestPodHostName, dnsTestServiceName)
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pod1.ObjectMeta.Labels = testServiceSelector
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pod1.Spec.Hostname = podHostname
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pod1.Spec.Subdomain = serviceName
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@ -407,7 +174,7 @@ var _ = SIGDescribe("DNS", func() {
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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)
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pod1 := createDNSPod(f.Namespace.Name, wheezyProbeCmd, jessieProbeCmd, dnsTestPodHostName, dnsTestServiceName)
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validateTargetedProbeOutput(f, pod1, []string{wheezyFileName, jessieFileName}, "foo.example.com.")
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@ -424,7 +191,7 @@ var _ = SIGDescribe("DNS", func() {
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// Run a pod which probes DNS and exposes the results by HTTP.
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By("creating a second pod to probe DNS")
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pod2 := createDNSPod(f.Namespace.Name, wheezyProbeCmd, jessieProbeCmd)
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pod2 := createDNSPod(f.Namespace.Name, wheezyProbeCmd, jessieProbeCmd, dnsTestPodHostName, dnsTestServiceName)
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validateTargetedProbeOutput(f, pod2, []string{wheezyFileName, jessieFileName}, "bar.example.com.")
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@ -444,11 +211,111 @@ var _ = SIGDescribe("DNS", func() {
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// Run a pod which probes DNS and exposes the results by HTTP.
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By("creating a third pod to probe DNS")
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pod3 := createDNSPod(f.Namespace.Name, wheezyProbeCmd, jessieProbeCmd)
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pod3 := createDNSPod(f.Namespace.Name, wheezyProbeCmd, jessieProbeCmd, dnsTestPodHostName, dnsTestServiceName)
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svc, err := f.ClientSet.CoreV1().Services(f.Namespace.Name).Get(externalNameService.Name, metav1.GetOptions{})
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Expect(err).NotTo(HaveOccurred())
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validateTargetedProbeOutput(f, pod3, []string{wheezyFileName, jessieFileName}, svc.Spec.ClusterIP)
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})
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It("should support configurable pod resolv.conf", func() {
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By("Preparing a test DNS service with injected DNS names...")
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testInjectedIP := "1.1.1.1"
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testDNSNameShort := "notexistname"
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testSearchPath := "resolv.conf.local"
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testDNSNameFull := fmt.Sprintf("%s.%s", testDNSNameShort, testSearchPath)
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testServerPod := generateDNSServerPod(map[string]string{
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testDNSNameFull: testInjectedIP,
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})
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testServerPod, err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Create(testServerPod)
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Expect(err).NotTo(HaveOccurred(), "failed to create pod %s", testServerPod.Name)
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framework.Logf("Created pod %v", testServerPod)
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defer func() {
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framework.Logf("Deleting pod %s...", testServerPod.Name)
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if err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Delete(testServerPod.Name, metav1.NewDeleteOptions(0)); err != nil {
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framework.Failf("Failed to delete pod %s: %v", testServerPod.Name, err)
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}
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}()
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Expect(f.WaitForPodRunning(testServerPod.Name)).NotTo(HaveOccurred(), "failed to wait for pod %s to be running", testServerPod.Name)
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// Retrieve server pod IP.
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testServerPod, err = f.ClientSet.CoreV1().Pods(f.Namespace.Name).Get(testServerPod.Name, metav1.GetOptions{})
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Expect(err).NotTo(HaveOccurred(), "failed to get pod %v", testServerPod.Name)
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testServerIP := testServerPod.Status.PodIP
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framework.Logf("testServerIP is %s", testServerIP)
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By("Creating a pod with dnsPolicy=None and customized dnsConfig...")
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testUtilsPod := generateDNSUtilsPod()
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testUtilsPod.Spec.DNSPolicy = v1.DNSNone
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testNdotsValue := "2"
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testUtilsPod.Spec.DNSConfig = &v1.PodDNSConfig{
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Nameservers: []string{testServerIP},
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Searches: []string{testSearchPath},
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Options: []v1.PodDNSConfigOption{
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{
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Name: "ndots",
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Value: &testNdotsValue,
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},
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},
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}
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testUtilsPod, err = f.ClientSet.CoreV1().Pods(f.Namespace.Name).Create(testUtilsPod)
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Expect(err).NotTo(HaveOccurred(), "failed to create pod %s", testUtilsPod.Name)
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framework.Logf("Created pod %v", testUtilsPod)
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defer func() {
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framework.Logf("Deleting pod %s...", testUtilsPod.Name)
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if err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Delete(testUtilsPod.Name, metav1.NewDeleteOptions(0)); err != nil {
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framework.Failf("Failed to delete pod %s: %v", testUtilsPod.Name, err)
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}
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}()
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Expect(f.WaitForPodRunning(testUtilsPod.Name)).NotTo(HaveOccurred(), "failed to wait for pod %s to be running", testUtilsPod.Name)
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By("Verifying customized DNS option is configured on pod...")
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// TODO: Figure out a better way other than checking the actual resolv,conf file.
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cmd := []string{"cat", "/etc/resolv.conf"}
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stdout, stderr, err := f.ExecWithOptions(framework.ExecOptions{
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Command: cmd,
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Namespace: f.Namespace.Name,
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PodName: testUtilsPod.Name,
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ContainerName: "util",
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CaptureStdout: true,
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CaptureStderr: true,
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})
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Expect(err).NotTo(HaveOccurred(), "failed to examine resolv,conf file on pod, stdout: %v, stderr: %v, err: %v", stdout, stderr, err)
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if !strings.Contains(stdout, "ndots:2") {
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framework.Failf("customized DNS options not found in resolv.conf, got: %s", stdout)
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}
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By("Verifying customized name server and search path are working...")
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// Do dig on not-exist-dns-name and see if the injected DNS record is returned.
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// This verifies both:
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// - Custom search path is appended.
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// - DNS query is sent to the specified server.
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cmd = []string{"/usr/bin/dig", "+short", "+search", testDNSNameShort}
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digFunc := func() (bool, error) {
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stdout, stderr, err := f.ExecWithOptions(framework.ExecOptions{
|
||||
Command: cmd,
|
||||
Namespace: f.Namespace.Name,
|
||||
PodName: testUtilsPod.Name,
|
||||
ContainerName: "util",
|
||||
CaptureStdout: true,
|
||||
CaptureStderr: true,
|
||||
})
|
||||
if err != nil {
|
||||
framework.Logf("Failed to execute dig command, stdout:%v, stderr: %v, err: %v", stdout, stderr, err)
|
||||
return false, nil
|
||||
}
|
||||
res := strings.Split(stdout, "\n")
|
||||
if len(res) != 1 || res[0] != testInjectedIP {
|
||||
framework.Logf("Expect command `%v` to return %s, got: %v", cmd, testInjectedIP, res)
|
||||
return false, nil
|
||||
}
|
||||
return true, nil
|
||||
}
|
||||
err = wait.PollImmediate(5*time.Second, 3*time.Minute, digFunc)
|
||||
Expect(err).NotTo(HaveOccurred(), "failed to verify customized name server and search path")
|
||||
|
||||
// TODO: Add more test cases for other DNSPolicies.
|
||||
})
|
||||
})
|
||||
|
||||
@ -17,6 +17,7 @@ limitations under the License.
|
||||
package network
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"strings"
|
||||
"time"
|
||||
@ -27,8 +28,10 @@ import (
|
||||
"k8s.io/apimachinery/pkg/fields"
|
||||
"k8s.io/apimachinery/pkg/labels"
|
||||
"k8s.io/apimachinery/pkg/util/intstr"
|
||||
"k8s.io/apimachinery/pkg/util/uuid"
|
||||
"k8s.io/apimachinery/pkg/util/wait"
|
||||
clientset "k8s.io/client-go/kubernetes"
|
||||
"k8s.io/kubernetes/pkg/api/testapi"
|
||||
"k8s.io/kubernetes/test/e2e/framework"
|
||||
imageutils "k8s.io/kubernetes/test/utils/image"
|
||||
|
||||
@ -229,13 +232,12 @@ func (t *dnsTestCommon) deleteUtilPod() {
|
||||
}
|
||||
}
|
||||
|
||||
func (t *dnsTestCommon) createDNSServer(aRecords map[string]string) {
|
||||
t.dnsServerPod = &v1.Pod{
|
||||
func generateDNSServerPod(aRecords map[string]string) *v1.Pod {
|
||||
pod := &v1.Pod{
|
||||
TypeMeta: metav1.TypeMeta{
|
||||
Kind: "Pod",
|
||||
},
|
||||
ObjectMeta: metav1.ObjectMeta{
|
||||
Namespace: t.f.Namespace.Name,
|
||||
GenerateName: "e2e-dns-configmap-dns-server-",
|
||||
},
|
||||
Spec: v1.PodSpec{
|
||||
@ -257,10 +259,15 @@ func (t *dnsTestCommon) createDNSServer(aRecords map[string]string) {
|
||||
}
|
||||
|
||||
for name, ip := range aRecords {
|
||||
t.dnsServerPod.Spec.Containers[0].Command = append(
|
||||
t.dnsServerPod.Spec.Containers[0].Command,
|
||||
pod.Spec.Containers[0].Command = append(
|
||||
pod.Spec.Containers[0].Command,
|
||||
fmt.Sprintf("-A/%v/%v", name, ip))
|
||||
}
|
||||
return pod
|
||||
}
|
||||
|
||||
func (t *dnsTestCommon) createDNSServer(aRecords map[string]string) {
|
||||
t.dnsServerPod = generateDNSServerPod(aRecords)
|
||||
|
||||
var err error
|
||||
t.dnsServerPod, err = t.c.CoreV1().Pods(t.f.Namespace.Name).Create(t.dnsServerPod)
|
||||
@ -280,3 +287,252 @@ func (t *dnsTestCommon) deleteDNSServerPod() {
|
||||
t.utilPod.Namespace, t.dnsServerPod.Name, err)
|
||||
}
|
||||
}
|
||||
|
||||
func createDNSPod(namespace, wheezyProbeCmd, jessieProbeCmd, podHostName, serviceName string) *v1.Pod {
|
||||
dnsPod := &v1.Pod{
|
||||
TypeMeta: metav1.TypeMeta{
|
||||
Kind: "Pod",
|
||||
APIVersion: testapi.Groups[v1.GroupName].GroupVersion().String(),
|
||||
},
|
||||
ObjectMeta: metav1.ObjectMeta{
|
||||
Name: "dns-test-" + string(uuid.NewUUID()),
|
||||
Namespace: namespace,
|
||||
},
|
||||
Spec: v1.PodSpec{
|
||||
Volumes: []v1.Volume{
|
||||
{
|
||||
Name: "results",
|
||||
VolumeSource: v1.VolumeSource{
|
||||
EmptyDir: &v1.EmptyDirVolumeSource{},
|
||||
},
|
||||
},
|
||||
},
|
||||
Containers: []v1.Container{
|
||||
// TODO: Consider scraping logs instead of running a webserver.
|
||||
{
|
||||
Name: "webserver",
|
||||
Image: imageutils.GetE2EImage(imageutils.TestWebserver),
|
||||
Ports: []v1.ContainerPort{
|
||||
{
|
||||
Name: "http",
|
||||
ContainerPort: 80,
|
||||
},
|
||||
},
|
||||
VolumeMounts: []v1.VolumeMount{
|
||||
{
|
||||
Name: "results",
|
||||
MountPath: "/results",
|
||||
},
|
||||
},
|
||||
},
|
||||
{
|
||||
Name: "querier",
|
||||
Image: imageutils.GetE2EImage(imageutils.Dnsutils),
|
||||
Command: []string{"sh", "-c", wheezyProbeCmd},
|
||||
VolumeMounts: []v1.VolumeMount{
|
||||
{
|
||||
Name: "results",
|
||||
MountPath: "/results",
|
||||
},
|
||||
},
|
||||
},
|
||||
{
|
||||
Name: "jessie-querier",
|
||||
Image: imageutils.GetE2EImage(imageutils.JessieDnsutils),
|
||||
Command: []string{"sh", "-c", jessieProbeCmd},
|
||||
VolumeMounts: []v1.VolumeMount{
|
||||
{
|
||||
Name: "results",
|
||||
MountPath: "/results",
|
||||
},
|
||||
},
|
||||
},
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
dnsPod.Spec.Hostname = podHostName
|
||||
dnsPod.Spec.Subdomain = serviceName
|
||||
|
||||
return dnsPod
|
||||
}
|
||||
|
||||
func createProbeCommand(namesToResolve []string, hostEntries []string, ptrLookupIP string, fileNamePrefix, namespace string) (string, []string) {
|
||||
fileNames := make([]string, 0, len(namesToResolve)*2)
|
||||
probeCmd := "for i in `seq 1 600`; do "
|
||||
for _, name := range namesToResolve {
|
||||
// Resolve by TCP and UDP DNS. Use $$(...) because $(...) is
|
||||
// expanded by kubernetes (though this won't expand so should
|
||||
// remain a literal, safe > sorry).
|
||||
lookup := "A"
|
||||
if strings.HasPrefix(name, "_") {
|
||||
lookup = "SRV"
|
||||
}
|
||||
fileName := fmt.Sprintf("%s_udp@%s", fileNamePrefix, name)
|
||||
fileNames = append(fileNames, fileName)
|
||||
probeCmd += fmt.Sprintf(`test -n "$$(dig +notcp +noall +answer +search %s %s)" && echo OK > /results/%s;`, name, lookup, fileName)
|
||||
fileName = fmt.Sprintf("%s_tcp@%s", fileNamePrefix, name)
|
||||
fileNames = append(fileNames, fileName)
|
||||
probeCmd += fmt.Sprintf(`test -n "$$(dig +tcp +noall +answer +search %s %s)" && echo OK > /results/%s;`, name, lookup, fileName)
|
||||
}
|
||||
|
||||
for _, name := range hostEntries {
|
||||
fileName := fmt.Sprintf("%s_hosts@%s", fileNamePrefix, name)
|
||||
fileNames = append(fileNames, fileName)
|
||||
probeCmd += fmt.Sprintf(`test -n "$$(getent hosts %s)" && echo OK > /results/%s;`, name, fileName)
|
||||
}
|
||||
|
||||
podARecByUDPFileName := fmt.Sprintf("%s_udp@PodARecord", fileNamePrefix)
|
||||
podARecByTCPFileName := fmt.Sprintf("%s_tcp@PodARecord", fileNamePrefix)
|
||||
probeCmd += fmt.Sprintf(`podARec=$$(hostname -i| awk -F. '{print $$1"-"$$2"-"$$3"-"$$4".%s.pod.cluster.local"}');`, namespace)
|
||||
probeCmd += fmt.Sprintf(`test -n "$$(dig +notcp +noall +answer +search $${podARec} A)" && echo OK > /results/%s;`, podARecByUDPFileName)
|
||||
probeCmd += fmt.Sprintf(`test -n "$$(dig +tcp +noall +answer +search $${podARec} A)" && echo OK > /results/%s;`, podARecByTCPFileName)
|
||||
fileNames = append(fileNames, podARecByUDPFileName)
|
||||
fileNames = append(fileNames, podARecByTCPFileName)
|
||||
|
||||
if len(ptrLookupIP) > 0 {
|
||||
ptrLookup := fmt.Sprintf("%s.in-addr.arpa.", strings.Join(reverseArray(strings.Split(ptrLookupIP, ".")), "."))
|
||||
ptrRecByUDPFileName := fmt.Sprintf("%s_udp@PTR", ptrLookupIP)
|
||||
ptrRecByTCPFileName := fmt.Sprintf("%s_tcp@PTR", ptrLookupIP)
|
||||
probeCmd += fmt.Sprintf(`test -n "$$(dig +notcp +noall +answer +search %s PTR)" && echo OK > /results/%s;`, ptrLookup, ptrRecByUDPFileName)
|
||||
probeCmd += fmt.Sprintf(`test -n "$$(dig +tcp +noall +answer +search %s PTR)" && echo OK > /results/%s;`, ptrLookup, ptrRecByTCPFileName)
|
||||
fileNames = append(fileNames, ptrRecByUDPFileName)
|
||||
fileNames = append(fileNames, ptrRecByTCPFileName)
|
||||
}
|
||||
|
||||
probeCmd += "sleep 1; done"
|
||||
return probeCmd, fileNames
|
||||
}
|
||||
|
||||
// createTargetedProbeCommand returns a command line that performs a DNS lookup for a specific record type
|
||||
func createTargetedProbeCommand(nameToResolve string, lookup string, fileNamePrefix string) (string, string) {
|
||||
fileName := fmt.Sprintf("%s_udp@%s", fileNamePrefix, nameToResolve)
|
||||
probeCmd := fmt.Sprintf("dig +short +tries=12 +norecurse %s %s > /results/%s", nameToResolve, lookup, fileName)
|
||||
return probeCmd, fileName
|
||||
}
|
||||
|
||||
func assertFilesExist(fileNames []string, fileDir string, pod *v1.Pod, client clientset.Interface) {
|
||||
assertFilesContain(fileNames, fileDir, pod, client, false, "")
|
||||
}
|
||||
|
||||
func assertFilesContain(fileNames []string, fileDir string, pod *v1.Pod, client clientset.Interface, check bool, expected string) {
|
||||
var failed []string
|
||||
|
||||
framework.ExpectNoError(wait.Poll(time.Second*10, time.Second*600, func() (bool, error) {
|
||||
failed = []string{}
|
||||
|
||||
ctx, cancel := context.WithTimeout(context.Background(), framework.SingleCallTimeout)
|
||||
defer cancel()
|
||||
|
||||
for _, fileName := range fileNames {
|
||||
contents, err := client.CoreV1().RESTClient().Get().
|
||||
Context(ctx).
|
||||
Namespace(pod.Namespace).
|
||||
Resource("pods").
|
||||
SubResource("proxy").
|
||||
Name(pod.Name).
|
||||
Suffix(fileDir, fileName).
|
||||
Do().Raw()
|
||||
|
||||
if err != nil {
|
||||
if ctx.Err() != nil {
|
||||
framework.Failf("Unable to read %s from pod %s: %v", fileName, pod.Name, err)
|
||||
} else {
|
||||
framework.Logf("Unable to read %s from pod %s: %v", fileName, pod.Name, err)
|
||||
}
|
||||
failed = append(failed, fileName)
|
||||
} else if check && strings.TrimSpace(string(contents)) != expected {
|
||||
framework.Logf("File %s from pod %s contains '%s' instead of '%s'", fileName, pod.Name, string(contents), expected)
|
||||
failed = append(failed, fileName)
|
||||
}
|
||||
}
|
||||
if len(failed) == 0 {
|
||||
return true, nil
|
||||
}
|
||||
framework.Logf("Lookups using %s failed for: %v\n", pod.Name, failed)
|
||||
return false, nil
|
||||
}))
|
||||
Expect(len(failed)).To(Equal(0))
|
||||
}
|
||||
|
||||
func validateDNSResults(f *framework.Framework, pod *v1.Pod, fileNames []string) {
|
||||
By("submitting the pod to kubernetes")
|
||||
podClient := f.ClientSet.CoreV1().Pods(f.Namespace.Name)
|
||||
defer func() {
|
||||
By("deleting the pod")
|
||||
defer GinkgoRecover()
|
||||
podClient.Delete(pod.Name, metav1.NewDeleteOptions(0))
|
||||
}()
|
||||
if _, err := podClient.Create(pod); err != nil {
|
||||
framework.Failf("Failed to create %s pod: %v", pod.Name, err)
|
||||
}
|
||||
|
||||
framework.ExpectNoError(f.WaitForPodRunning(pod.Name))
|
||||
|
||||
By("retrieving the pod")
|
||||
pod, err := podClient.Get(pod.Name, metav1.GetOptions{})
|
||||
if err != nil {
|
||||
framework.Failf("Failed to get pod %s: %v", pod.Name, err)
|
||||
}
|
||||
// Try to find results for each expected name.
|
||||
By("looking for the results for each expected name from probers")
|
||||
assertFilesExist(fileNames, "results", pod, f.ClientSet)
|
||||
|
||||
// TODO: probe from the host, too.
|
||||
|
||||
framework.Logf("DNS probes using %s succeeded\n", pod.Name)
|
||||
}
|
||||
|
||||
func validateTargetedProbeOutput(f *framework.Framework, pod *v1.Pod, fileNames []string, value string) {
|
||||
By("submitting the pod to kubernetes")
|
||||
podClient := f.ClientSet.CoreV1().Pods(f.Namespace.Name)
|
||||
defer func() {
|
||||
By("deleting the pod")
|
||||
defer GinkgoRecover()
|
||||
podClient.Delete(pod.Name, metav1.NewDeleteOptions(0))
|
||||
}()
|
||||
if _, err := podClient.Create(pod); err != nil {
|
||||
framework.Failf("Failed to create %s pod: %v", pod.Name, err)
|
||||
}
|
||||
|
||||
framework.ExpectNoError(f.WaitForPodRunning(pod.Name))
|
||||
|
||||
By("retrieving the pod")
|
||||
pod, err := podClient.Get(pod.Name, metav1.GetOptions{})
|
||||
if err != nil {
|
||||
framework.Failf("Failed to get pod %s: %v", pod.Name, err)
|
||||
}
|
||||
// Try to find the expected value for each expected name.
|
||||
By("looking for the results for each expected name from probers")
|
||||
assertFilesContain(fileNames, "results", pod, f.ClientSet, true, value)
|
||||
|
||||
framework.Logf("DNS probes using %s succeeded\n", pod.Name)
|
||||
}
|
||||
|
||||
func reverseArray(arr []string) []string {
|
||||
for i := 0; i < len(arr)/2; i++ {
|
||||
j := len(arr) - i - 1
|
||||
arr[i], arr[j] = arr[j], arr[i]
|
||||
}
|
||||
return arr
|
||||
}
|
||||
|
||||
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"},
|
||||
},
|
||||
},
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user