147 lines
3.3 KiB
Go
147 lines
3.3 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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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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"os"
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"time"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
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"github.com/golang/glog"
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)
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// TestClusterDNS checks that cluster DNS works.
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func TestClusterDNS(c *client.Client) bool {
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// TODO:
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// https://github.com/GoogleCloudPlatform/kubernetes/issues/3305
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// (but even if it's fixed, this will need a version check for
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// skewed version tests)
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if os.Getenv("KUBERNETES_PROVIDER") == "gke" {
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glog.Infof("skipping TestClusterDNS on gke")
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return true
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}
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podClient := c.Pods(api.NamespaceDefault)
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//TODO: Wait for skyDNS
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// All the names we need to be able to resolve.
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namesToResolve := []string{
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"kubernetes-ro",
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"kubernetes-ro.default",
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"kubernetes-ro.default.kubernetes.local",
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"google.com",
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}
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probeCmd := "for i in `seq 1 600`; do "
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for _, name := range namesToResolve {
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probeCmd += fmt.Sprintf("wget -O /dev/null %s && echo OK > /results/%s;", name, name)
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}
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probeCmd += "sleep 1; done"
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// Run a pod which probes DNS and exposes the results by HTTP.
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pod := &api.Pod{
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TypeMeta: api.TypeMeta{
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Kind: "Pod",
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APIVersion: "v1beta1",
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},
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ObjectMeta: api.ObjectMeta{
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Name: "dns-test",
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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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Source: &api.VolumeSource{
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EmptyDir: &api.EmptyDir{},
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},
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},
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},
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Containers: []api.Container{
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{
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Name: "webserver",
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Image: "kubernetes/test-webserver",
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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: "pinger",
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Image: "busybox",
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Command: []string{"sh", "-c", probeCmd},
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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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_, err := podClient.Create(pod)
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if err != nil {
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glog.Errorf("Failed to create dns-test pod: %v", err)
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return false
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}
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defer podClient.Delete(pod.Name)
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waitForPodRunning(c, pod.Name)
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pod, err = podClient.Get(pod.Name)
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if err != nil {
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glog.Errorf("Failed to get pod: %v", err)
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return false
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}
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// Try to find results for each expected name.
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var failed []string
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for try := 1; try < 100; try++ {
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failed = []string{}
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for _, name := range namesToResolve {
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_, err := c.Get().
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Prefix("proxy").
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Resource("pods").
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Namespace("default").
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Name(pod.Name).
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Suffix("results", name).
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Do().Raw()
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if err != nil {
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failed = append(failed, name)
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}
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}
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if len(failed) == 0 {
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break
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}
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glog.Infof("lookups failed for: %v", failed)
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time.Sleep(3 * time.Second)
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}
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if len(failed) != 0 {
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glog.Errorf("DNS failed for: %v", failed)
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return false
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}
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// TODO: probe from the host, too.
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glog.Info("DNS probes succeeded")
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return true
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}
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