242 lines
8.1 KiB
Go
242 lines
8.1 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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"math"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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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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testutils "k8s.io/kubernetes/test/utils"
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)
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var _ = framework.KubeDescribe("Multi-AZ Clusters", func() {
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f := framework.NewDefaultFramework("multi-az")
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var zoneCount int
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var err error
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image := "gcr.io/google_containers/serve_hostname:v1.4"
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BeforeEach(func() {
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framework.SkipUnlessProviderIs("gce", "gke", "aws")
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if zoneCount <= 0 {
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zoneCount, err = getZoneCount(f.ClientSet)
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Expect(err).NotTo(HaveOccurred())
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}
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By(fmt.Sprintf("Checking for multi-zone cluster. Zone count = %d", zoneCount))
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msg := fmt.Sprintf("Zone count is %d, only run for multi-zone clusters, skipping test", zoneCount)
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framework.SkipUnlessAtLeast(zoneCount, 2, msg)
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// TODO: SkipUnlessDefaultScheduler() // Non-default schedulers might not spread
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})
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It("should spread the pods of a service across zones", func() {
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SpreadServiceOrFail(f, (2*zoneCount)+1, image)
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})
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It("should spread the pods of a replication controller across zones", func() {
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SpreadRCOrFail(f, int32((2*zoneCount)+1), image)
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})
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})
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// Check that the pods comprising a service get spread evenly across available zones
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func SpreadServiceOrFail(f *framework.Framework, replicaCount int, image string) {
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// First create the service
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serviceName := "test-service"
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serviceSpec := &v1.Service{
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ObjectMeta: v1.ObjectMeta{
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Name: serviceName,
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Namespace: f.Namespace.Name,
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},
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Spec: v1.ServiceSpec{
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Selector: map[string]string{
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"service": serviceName,
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},
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Ports: []v1.ServicePort{{
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Port: 80,
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TargetPort: intstr.FromInt(80),
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}},
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},
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}
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_, err := f.ClientSet.Core().Services(f.Namespace.Name).Create(serviceSpec)
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Expect(err).NotTo(HaveOccurred())
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// Now create some pods behind the service
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podSpec := &v1.Pod{
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ObjectMeta: v1.ObjectMeta{
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Name: serviceName,
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Labels: map[string]string{"service": serviceName},
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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",
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Image: framework.GetPauseImageName(f.ClientSet),
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},
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},
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},
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}
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// Caution: StartPods requires at least one pod to replicate.
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// Based on the callers, replicas is always positive number: zoneCount >= 0 implies (2*zoneCount)+1 > 0.
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// Thus, no need to test for it. Once the precondition changes to zero number of replicas,
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// test for replicaCount > 0. Otherwise, StartPods panics.
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framework.ExpectNoError(testutils.StartPods(f.ClientSet, replicaCount, f.Namespace.Name, serviceName, *podSpec, false, framework.Logf))
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// Wait for all of them to be scheduled
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selector := labels.SelectorFromSet(labels.Set(map[string]string{"service": serviceName}))
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pods, err := framework.WaitForPodsWithLabelScheduled(f.ClientSet, f.Namespace.Name, selector)
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Expect(err).NotTo(HaveOccurred())
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// Now make sure they're spread across zones
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zoneNames, err := getZoneNames(f.ClientSet)
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Expect(err).NotTo(HaveOccurred())
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Expect(checkZoneSpreading(f.ClientSet, pods, zoneNames)).To(Equal(true))
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}
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// Find the name of the zone in which a Node is running
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func getZoneNameForNode(node v1.Node) (string, error) {
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for key, value := range node.Labels {
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if key == metav1.LabelZoneFailureDomain {
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return value, nil
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}
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}
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return "", fmt.Errorf("Zone name for node %s not found. No label with key %s",
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node.Name, metav1.LabelZoneFailureDomain)
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}
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// Find the names of all zones in which we have nodes in this cluster.
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func getZoneNames(c clientset.Interface) ([]string, error) {
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zoneNames := sets.NewString()
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nodes, err := c.Core().Nodes().List(v1.ListOptions{})
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if err != nil {
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return nil, err
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}
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for _, node := range nodes.Items {
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zoneName, err := getZoneNameForNode(node)
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Expect(err).NotTo(HaveOccurred())
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zoneNames.Insert(zoneName)
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}
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return zoneNames.List(), nil
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}
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// Return the number of zones in which we have nodes in this cluster.
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func getZoneCount(c clientset.Interface) (int, error) {
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zoneNames, err := getZoneNames(c)
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if err != nil {
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return -1, err
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}
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return len(zoneNames), nil
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}
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// Find the name of the zone in which the pod is scheduled
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func getZoneNameForPod(c clientset.Interface, pod v1.Pod) (string, error) {
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By(fmt.Sprintf("Getting zone name for pod %s, on node %s", pod.Name, pod.Spec.NodeName))
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node, err := c.Core().Nodes().Get(pod.Spec.NodeName, metav1.GetOptions{})
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Expect(err).NotTo(HaveOccurred())
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return getZoneNameForNode(*node)
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}
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// Determine whether a set of pods are approximately evenly spread
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// across a given set of zones
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func checkZoneSpreading(c clientset.Interface, pods *v1.PodList, zoneNames []string) (bool, error) {
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podsPerZone := make(map[string]int)
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for _, zoneName := range zoneNames {
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podsPerZone[zoneName] = 0
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}
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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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zoneName, err := getZoneNameForPod(c, pod)
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Expect(err).NotTo(HaveOccurred())
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podsPerZone[zoneName] = podsPerZone[zoneName] + 1
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}
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minPodsPerZone := math.MaxInt32
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maxPodsPerZone := 0
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for _, podCount := range podsPerZone {
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if podCount < minPodsPerZone {
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minPodsPerZone = podCount
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}
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if podCount > maxPodsPerZone {
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maxPodsPerZone = podCount
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}
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}
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Expect(minPodsPerZone).To(BeNumerically("~", maxPodsPerZone, 1),
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"Pods were not evenly spread across zones. %d in one zone and %d in another zone",
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minPodsPerZone, maxPodsPerZone)
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return true, nil
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}
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// Check that the pods comprising a replication controller get spread evenly across available zones
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func SpreadRCOrFail(f *framework.Framework, replicaCount int32, image string) {
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name := "ubelite-spread-rc-" + string(uuid.NewUUID())
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By(fmt.Sprintf("Creating replication controller %s", name))
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controller, err := f.ClientSet.Core().ReplicationControllers(f.Namespace.Name).Create(&v1.ReplicationController{
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ObjectMeta: v1.ObjectMeta{
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Namespace: f.Namespace.Name,
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Name: name,
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},
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Spec: v1.ReplicationControllerSpec{
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Replicas: &replicaCount,
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Selector: map[string]string{
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"name": name,
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},
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Template: &v1.PodTemplateSpec{
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ObjectMeta: v1.ObjectMeta{
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Labels: map[string]string{"name": name},
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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: name,
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Image: image,
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Ports: []v1.ContainerPort{{ContainerPort: 9376}},
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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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Expect(err).NotTo(HaveOccurred())
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// Cleanup the replication controller when we are done.
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defer func() {
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// Resize the replication controller to zero to get rid of pods.
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if err := framework.DeleteRCAndPods(f.ClientSet, f.InternalClientset, f.Namespace.Name, controller.Name); err != nil {
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framework.Logf("Failed to cleanup replication controller %v: %v.", controller.Name, err)
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}
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}()
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// List the pods, making sure we observe all the replicas.
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selector := labels.SelectorFromSet(labels.Set(map[string]string{"name": name}))
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pods, err := framework.PodsCreated(f.ClientSet, f.Namespace.Name, name, replicaCount)
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Expect(err).NotTo(HaveOccurred())
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// Wait for all of them to be scheduled
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By(fmt.Sprintf("Waiting for %d replicas of %s to be scheduled. Selector: %v", replicaCount, name, selector))
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pods, err = framework.WaitForPodsWithLabelScheduled(f.ClientSet, f.Namespace.Name, selector)
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Expect(err).NotTo(HaveOccurred())
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// Now make sure they're spread across zones
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zoneNames, err := getZoneNames(f.ClientSet)
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Expect(err).NotTo(HaveOccurred())
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Expect(checkZoneSpreading(f.ClientSet, pods, zoneNames)).To(Equal(true))
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}
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