391 lines
12 KiB
Go
391 lines
12 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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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/kubernetes/pkg/api/resource"
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"k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/util/intstr"
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"k8s.io/kubernetes/pkg/util/uuid"
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"k8s.io/kubernetes/test/e2e/framework"
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"fmt"
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"strconv"
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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 (
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// These numbers are obtained empirically.
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// If you make them too low, you'll get flaky
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// tests instead of failing ones if the race bug reappears.
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// If you make volume counts or pod counts too high,
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// the tests may fail because mounting configmap/git_repo
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// volumes is not very fast and the tests may time out
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// waiting for pods to become Running.
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// And of course the higher are the numbers, the
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// slower are the tests.
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wrappedVolumeRaceConfigMapVolumeCount = 50
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wrappedVolumeRaceConfigMapPodCount = 5
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wrappedVolumeRaceConfigMapIterationCount = 3
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wrappedVolumeRaceGitRepoVolumeCount = 50
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wrappedVolumeRaceGitRepoPodCount = 5
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wrappedVolumeRaceGitRepoIterationCount = 3
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wrappedVolumeRaceRCNamePrefix = "wrapped-volume-race-"
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)
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var _ = framework.KubeDescribe("EmptyDir wrapper volumes", func() {
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f := framework.NewDefaultFramework("emptydir-wrapper")
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It("should not conflict [Volume]", func() {
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name := "emptydir-wrapper-test-" + string(uuid.NewUUID())
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volumeName := "secret-volume"
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volumeMountPath := "/etc/secret-volume"
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secret := &v1.Secret{
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ObjectMeta: metav1.ObjectMeta{
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Namespace: f.Namespace.Name,
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Name: name,
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},
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Data: map[string][]byte{
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"data-1": []byte("value-1\n"),
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},
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}
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var err error
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if secret, err = f.ClientSet.Core().Secrets(f.Namespace.Name).Create(secret); err != nil {
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framework.Failf("unable to create test secret %s: %v", secret.Name, err)
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}
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gitVolumeName := "git-volume"
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gitVolumeMountPath := "/etc/git-volume"
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gitURL, gitRepo, gitCleanup := createGitServer(f)
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defer gitCleanup()
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pod := &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: "pod-secrets-" + string(uuid.NewUUID()),
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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: volumeName,
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VolumeSource: v1.VolumeSource{
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Secret: &v1.SecretVolumeSource{
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SecretName: name,
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},
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},
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},
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{
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Name: gitVolumeName,
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VolumeSource: v1.VolumeSource{
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GitRepo: &v1.GitRepoVolumeSource{
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Repository: gitURL,
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Directory: gitRepo,
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},
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},
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},
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},
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Containers: []v1.Container{
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{
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Name: "secret-test",
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Image: "gcr.io/google_containers/test-webserver:e2e",
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VolumeMounts: []v1.VolumeMount{
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{
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Name: volumeName,
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MountPath: volumeMountPath,
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ReadOnly: true,
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},
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{
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Name: gitVolumeName,
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MountPath: gitVolumeMountPath,
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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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pod = f.PodClient().CreateSync(pod)
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defer func() {
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By("Cleaning up the secret")
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if err := f.ClientSet.Core().Secrets(f.Namespace.Name).Delete(secret.Name, nil); err != nil {
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framework.Failf("unable to delete secret %v: %v", secret.Name, err)
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}
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By("Cleaning up the git vol pod")
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if err = f.ClientSet.Core().Pods(f.Namespace.Name).Delete(pod.Name, metav1.NewDeleteOptions(0)); err != nil {
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framework.Failf("unable to delete git vol pod %v: %v", pod.Name, err)
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}
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}()
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})
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// The following two tests check for the problem fixed in #29641.
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// In order to reproduce it you need to revert the fix, e.g. via
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// git revert -n df1e925143daf34199b55ffb91d0598244888cce
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// or
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// curl -sL https://github.com/kubernetes/kubernetes/pull/29641.patch | patch -p1 -R
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//
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// After that these tests will fail because some of the pods
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// they create never enter Running state.
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//
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// They need to be [Serial] and [Slow] because they try to induce
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// the race by creating pods with many volumes and container volume mounts,
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// which takes considerable time and may interfere with other tests.
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//
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// Probably should also try making tests for secrets and downwardapi,
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// but these cases are harder because tmpfs-based emptyDir
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// appears to be less prone to the race problem.
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It("should not cause race condition when used for configmaps [Serial] [Slow] [Volume]", func() {
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configMapNames := createConfigmapsForRace(f)
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defer deleteConfigMaps(f, configMapNames)
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volumes, volumeMounts := makeConfigMapVolumes(configMapNames)
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for i := 0; i < wrappedVolumeRaceConfigMapIterationCount; i++ {
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testNoWrappedVolumeRace(f, volumes, volumeMounts, wrappedVolumeRaceConfigMapPodCount)
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}
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})
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It("should not cause race condition when used for git_repo [Serial] [Slow] [Volume]", func() {
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gitURL, gitRepo, cleanup := createGitServer(f)
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defer cleanup()
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volumes, volumeMounts := makeGitRepoVolumes(gitURL, gitRepo)
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for i := 0; i < wrappedVolumeRaceGitRepoIterationCount; i++ {
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testNoWrappedVolumeRace(f, volumes, volumeMounts, wrappedVolumeRaceGitRepoPodCount)
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}
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})
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})
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func createGitServer(f *framework.Framework) (gitURL string, gitRepo string, cleanup func()) {
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var err error
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gitServerPodName := "git-server-" + string(uuid.NewUUID())
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containerPort := 8000
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labels := map[string]string{"name": gitServerPodName}
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gitServerPod := &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: gitServerPodName,
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Labels: labels,
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},
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: "git-repo",
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Image: "gcr.io/google_containers/fakegitserver:0.1",
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ImagePullPolicy: "IfNotPresent",
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Ports: []v1.ContainerPort{
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{ContainerPort: int32(containerPort)},
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},
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},
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},
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},
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}
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f.PodClient().CreateSync(gitServerPod)
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// Portal IP and port
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httpPort := 2345
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gitServerSvc := &v1.Service{
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ObjectMeta: metav1.ObjectMeta{
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Name: "git-server-svc",
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},
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Spec: v1.ServiceSpec{
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Selector: labels,
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Ports: []v1.ServicePort{
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{
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Name: "http-portal",
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Port: int32(httpPort),
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TargetPort: intstr.FromInt(containerPort),
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},
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},
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},
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}
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if gitServerSvc, err = f.ClientSet.Core().Services(f.Namespace.Name).Create(gitServerSvc); err != nil {
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framework.Failf("unable to create test git server service %s: %v", gitServerSvc.Name, err)
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}
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return "http://" + gitServerSvc.Spec.ClusterIP + ":" + strconv.Itoa(httpPort), "test", func() {
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By("Cleaning up the git server pod")
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if err := f.ClientSet.Core().Pods(f.Namespace.Name).Delete(gitServerPod.Name, metav1.NewDeleteOptions(0)); err != nil {
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framework.Failf("unable to delete git server pod %v: %v", gitServerPod.Name, err)
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}
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By("Cleaning up the git server svc")
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if err := f.ClientSet.Core().Services(f.Namespace.Name).Delete(gitServerSvc.Name, nil); err != nil {
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framework.Failf("unable to delete git server svc %v: %v", gitServerSvc.Name, err)
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}
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}
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}
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func makeGitRepoVolumes(gitURL, gitRepo string) (volumes []v1.Volume, volumeMounts []v1.VolumeMount) {
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for i := 0; i < wrappedVolumeRaceGitRepoVolumeCount; i++ {
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volumeName := fmt.Sprintf("racey-git-repo-%d", i)
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volumes = append(volumes, v1.Volume{
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Name: volumeName,
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VolumeSource: v1.VolumeSource{
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GitRepo: &v1.GitRepoVolumeSource{
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Repository: gitURL,
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Directory: gitRepo,
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},
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},
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})
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volumeMounts = append(volumeMounts, v1.VolumeMount{
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Name: volumeName,
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MountPath: fmt.Sprintf("/etc/git-volume-%d", i),
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})
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}
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return
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}
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func createConfigmapsForRace(f *framework.Framework) (configMapNames []string) {
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By(fmt.Sprintf("Creating %d configmaps", wrappedVolumeRaceConfigMapVolumeCount))
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for i := 0; i < wrappedVolumeRaceConfigMapVolumeCount; i++ {
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configMapName := fmt.Sprintf("racey-configmap-%d", i)
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configMapNames = append(configMapNames, configMapName)
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configMap := &v1.ConfigMap{
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ObjectMeta: metav1.ObjectMeta{
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Namespace: f.Namespace.Name,
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Name: configMapName,
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},
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Data: map[string]string{
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"data-1": "value-1",
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},
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}
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_, err := f.ClientSet.Core().ConfigMaps(f.Namespace.Name).Create(configMap)
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framework.ExpectNoError(err)
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}
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return
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}
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func deleteConfigMaps(f *framework.Framework, configMapNames []string) {
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By("Cleaning up the configMaps")
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for _, configMapName := range configMapNames {
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err := f.ClientSet.Core().ConfigMaps(f.Namespace.Name).Delete(configMapName, nil)
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Expect(err).NotTo(HaveOccurred(), "unable to delete configMap %v", configMapName)
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}
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}
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func makeConfigMapVolumes(configMapNames []string) (volumes []v1.Volume, volumeMounts []v1.VolumeMount) {
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for i, configMapName := range configMapNames {
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volumeName := fmt.Sprintf("racey-configmap-%d", i)
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volumes = append(volumes, v1.Volume{
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Name: volumeName,
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VolumeSource: v1.VolumeSource{
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ConfigMap: &v1.ConfigMapVolumeSource{
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LocalObjectReference: v1.LocalObjectReference{
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Name: configMapName,
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},
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Items: []v1.KeyToPath{
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{
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Key: "data-1",
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Path: "data-1",
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},
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},
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},
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},
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})
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volumeMounts = append(volumeMounts, v1.VolumeMount{
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Name: volumeName,
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MountPath: fmt.Sprintf("/etc/config-%d", i),
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})
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}
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return
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}
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func testNoWrappedVolumeRace(f *framework.Framework, volumes []v1.Volume, volumeMounts []v1.VolumeMount, podCount int32) {
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rcName := wrappedVolumeRaceRCNamePrefix + string(uuid.NewUUID())
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nodeList := framework.GetReadySchedulableNodesOrDie(f.ClientSet)
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Expect(len(nodeList.Items)).To(BeNumerically(">", 0))
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targetNode := nodeList.Items[0]
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By("Creating RC which spawns configmap-volume pods")
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affinity := &v1.Affinity{
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NodeAffinity: &v1.NodeAffinity{
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RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
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NodeSelectorTerms: []v1.NodeSelectorTerm{
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{
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MatchExpressions: []v1.NodeSelectorRequirement{
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{
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Key: "kubernetes.io/hostname",
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Operator: v1.NodeSelectorOpIn,
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Values: []string{targetNode.Name},
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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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}
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rc := &v1.ReplicationController{
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ObjectMeta: metav1.ObjectMeta{
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Name: rcName,
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},
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Spec: v1.ReplicationControllerSpec{
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Replicas: &podCount,
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Selector: map[string]string{
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"name": rcName,
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},
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Template: &v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: map[string]string{"name": rcName},
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},
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: "test-container",
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Image: "gcr.io/google_containers/busybox:1.24",
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Command: []string{"sleep", "10000"},
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceCPU: resource.MustParse("10m"),
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},
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},
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VolumeMounts: volumeMounts,
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},
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},
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Affinity: affinity,
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DNSPolicy: v1.DNSDefault,
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Volumes: volumes,
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},
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},
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},
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}
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_, err := f.ClientSet.Core().ReplicationControllers(f.Namespace.Name).Create(rc)
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Expect(err).NotTo(HaveOccurred(), "error creating replication controller")
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defer func() {
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err := framework.DeleteRCAndPods(f.ClientSet, f.InternalClientset, f.Namespace.Name, rcName)
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framework.ExpectNoError(err)
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}()
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pods, err := framework.PodsCreated(f.ClientSet, f.Namespace.Name, rcName, podCount)
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By("Ensuring each pod is running")
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// Wait for the pods to enter the running state. Waiting loops until the pods
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// are running so non-running pods cause a timeout for this test.
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for _, pod := range pods.Items {
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if pod.DeletionTimestamp != nil {
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continue
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}
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err = f.WaitForPodRunning(pod.Name)
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Expect(err).NotTo(HaveOccurred(), "Failed waiting for pod %s to enter running state", pod.Name)
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}
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}
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