242 lines
8.2 KiB
Go
242 lines
8.2 KiB
Go
/*
|
|
Copyright 2015 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package e2e
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
|
|
. "github.com/onsi/ginkgo"
|
|
. "github.com/onsi/gomega"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/labels"
|
|
"k8s.io/apimachinery/pkg/util/sets"
|
|
"k8s.io/kubernetes/pkg/api/v1"
|
|
"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
|
|
"k8s.io/kubernetes/pkg/util/intstr"
|
|
"k8s.io/kubernetes/pkg/util/uuid"
|
|
"k8s.io/kubernetes/test/e2e/framework"
|
|
testutils "k8s.io/kubernetes/test/utils"
|
|
)
|
|
|
|
var _ = framework.KubeDescribe("Multi-AZ Clusters", func() {
|
|
f := framework.NewDefaultFramework("multi-az")
|
|
var zoneCount int
|
|
var err error
|
|
image := "gcr.io/google_containers/serve_hostname:v1.4"
|
|
BeforeEach(func() {
|
|
framework.SkipUnlessProviderIs("gce", "gke", "aws")
|
|
if zoneCount <= 0 {
|
|
zoneCount, err = getZoneCount(f.ClientSet)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
}
|
|
By(fmt.Sprintf("Checking for multi-zone cluster. Zone count = %d", zoneCount))
|
|
msg := fmt.Sprintf("Zone count is %d, only run for multi-zone clusters, skipping test", zoneCount)
|
|
framework.SkipUnlessAtLeast(zoneCount, 2, msg)
|
|
// TODO: SkipUnlessDefaultScheduler() // Non-default schedulers might not spread
|
|
})
|
|
It("should spread the pods of a service across zones", func() {
|
|
SpreadServiceOrFail(f, (2*zoneCount)+1, image)
|
|
})
|
|
|
|
It("should spread the pods of a replication controller across zones", func() {
|
|
SpreadRCOrFail(f, int32((2*zoneCount)+1), image)
|
|
})
|
|
})
|
|
|
|
// Check that the pods comprising a service get spread evenly across available zones
|
|
func SpreadServiceOrFail(f *framework.Framework, replicaCount int, image string) {
|
|
// First create the service
|
|
serviceName := "test-service"
|
|
serviceSpec := &v1.Service{
|
|
ObjectMeta: metav1.ObjectMeta{
|
|
Name: serviceName,
|
|
Namespace: f.Namespace.Name,
|
|
},
|
|
Spec: v1.ServiceSpec{
|
|
Selector: map[string]string{
|
|
"service": serviceName,
|
|
},
|
|
Ports: []v1.ServicePort{{
|
|
Port: 80,
|
|
TargetPort: intstr.FromInt(80),
|
|
}},
|
|
},
|
|
}
|
|
_, err := f.ClientSet.Core().Services(f.Namespace.Name).Create(serviceSpec)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
|
|
// Now create some pods behind the service
|
|
podSpec := &v1.Pod{
|
|
ObjectMeta: metav1.ObjectMeta{
|
|
Name: serviceName,
|
|
Labels: map[string]string{"service": serviceName},
|
|
},
|
|
Spec: v1.PodSpec{
|
|
Containers: []v1.Container{
|
|
{
|
|
Name: "test",
|
|
Image: framework.GetPauseImageName(f.ClientSet),
|
|
},
|
|
},
|
|
},
|
|
}
|
|
|
|
// Caution: StartPods requires at least one pod to replicate.
|
|
// Based on the callers, replicas is always positive number: zoneCount >= 0 implies (2*zoneCount)+1 > 0.
|
|
// Thus, no need to test for it. Once the precondition changes to zero number of replicas,
|
|
// test for replicaCount > 0. Otherwise, StartPods panics.
|
|
framework.ExpectNoError(testutils.StartPods(f.ClientSet, replicaCount, f.Namespace.Name, serviceName, *podSpec, false, framework.Logf))
|
|
|
|
// Wait for all of them to be scheduled
|
|
selector := labels.SelectorFromSet(labels.Set(map[string]string{"service": serviceName}))
|
|
pods, err := framework.WaitForPodsWithLabelScheduled(f.ClientSet, f.Namespace.Name, selector)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
|
|
// Now make sure they're spread across zones
|
|
zoneNames, err := getZoneNames(f.ClientSet)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(checkZoneSpreading(f.ClientSet, pods, zoneNames)).To(Equal(true))
|
|
}
|
|
|
|
// Find the name of the zone in which a Node is running
|
|
func getZoneNameForNode(node v1.Node) (string, error) {
|
|
for key, value := range node.Labels {
|
|
if key == metav1.LabelZoneFailureDomain {
|
|
return value, nil
|
|
}
|
|
}
|
|
return "", fmt.Errorf("Zone name for node %s not found. No label with key %s",
|
|
node.Name, metav1.LabelZoneFailureDomain)
|
|
}
|
|
|
|
// Find the names of all zones in which we have nodes in this cluster.
|
|
func getZoneNames(c clientset.Interface) ([]string, error) {
|
|
zoneNames := sets.NewString()
|
|
nodes, err := c.Core().Nodes().List(metav1.ListOptions{})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, node := range nodes.Items {
|
|
zoneName, err := getZoneNameForNode(node)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
zoneNames.Insert(zoneName)
|
|
}
|
|
return zoneNames.List(), nil
|
|
}
|
|
|
|
// Return the number of zones in which we have nodes in this cluster.
|
|
func getZoneCount(c clientset.Interface) (int, error) {
|
|
zoneNames, err := getZoneNames(c)
|
|
if err != nil {
|
|
return -1, err
|
|
}
|
|
return len(zoneNames), nil
|
|
}
|
|
|
|
// Find the name of the zone in which the pod is scheduled
|
|
func getZoneNameForPod(c clientset.Interface, pod v1.Pod) (string, error) {
|
|
By(fmt.Sprintf("Getting zone name for pod %s, on node %s", pod.Name, pod.Spec.NodeName))
|
|
node, err := c.Core().Nodes().Get(pod.Spec.NodeName, metav1.GetOptions{})
|
|
Expect(err).NotTo(HaveOccurred())
|
|
return getZoneNameForNode(*node)
|
|
}
|
|
|
|
// Determine whether a set of pods are approximately evenly spread
|
|
// across a given set of zones
|
|
func checkZoneSpreading(c clientset.Interface, pods *v1.PodList, zoneNames []string) (bool, error) {
|
|
podsPerZone := make(map[string]int)
|
|
for _, zoneName := range zoneNames {
|
|
podsPerZone[zoneName] = 0
|
|
}
|
|
for _, pod := range pods.Items {
|
|
if pod.DeletionTimestamp != nil {
|
|
continue
|
|
}
|
|
zoneName, err := getZoneNameForPod(c, pod)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
podsPerZone[zoneName] = podsPerZone[zoneName] + 1
|
|
}
|
|
minPodsPerZone := math.MaxInt32
|
|
maxPodsPerZone := 0
|
|
for _, podCount := range podsPerZone {
|
|
if podCount < minPodsPerZone {
|
|
minPodsPerZone = podCount
|
|
}
|
|
if podCount > maxPodsPerZone {
|
|
maxPodsPerZone = podCount
|
|
}
|
|
}
|
|
Expect(minPodsPerZone).To(BeNumerically("~", maxPodsPerZone, 1),
|
|
"Pods were not evenly spread across zones. %d in one zone and %d in another zone",
|
|
minPodsPerZone, maxPodsPerZone)
|
|
return true, nil
|
|
}
|
|
|
|
// Check that the pods comprising a replication controller get spread evenly across available zones
|
|
func SpreadRCOrFail(f *framework.Framework, replicaCount int32, image string) {
|
|
name := "ubelite-spread-rc-" + string(uuid.NewUUID())
|
|
By(fmt.Sprintf("Creating replication controller %s", name))
|
|
controller, err := f.ClientSet.Core().ReplicationControllers(f.Namespace.Name).Create(&v1.ReplicationController{
|
|
ObjectMeta: metav1.ObjectMeta{
|
|
Namespace: f.Namespace.Name,
|
|
Name: name,
|
|
},
|
|
Spec: v1.ReplicationControllerSpec{
|
|
Replicas: &replicaCount,
|
|
Selector: map[string]string{
|
|
"name": name,
|
|
},
|
|
Template: &v1.PodTemplateSpec{
|
|
ObjectMeta: metav1.ObjectMeta{
|
|
Labels: map[string]string{"name": name},
|
|
},
|
|
Spec: v1.PodSpec{
|
|
Containers: []v1.Container{
|
|
{
|
|
Name: name,
|
|
Image: image,
|
|
Ports: []v1.ContainerPort{{ContainerPort: 9376}},
|
|
},
|
|
},
|
|
},
|
|
},
|
|
},
|
|
})
|
|
Expect(err).NotTo(HaveOccurred())
|
|
// Cleanup the replication controller when we are done.
|
|
defer func() {
|
|
// Resize the replication controller to zero to get rid of pods.
|
|
if err := framework.DeleteRCAndPods(f.ClientSet, f.InternalClientset, f.Namespace.Name, controller.Name); err != nil {
|
|
framework.Logf("Failed to cleanup replication controller %v: %v.", controller.Name, err)
|
|
}
|
|
}()
|
|
// List the pods, making sure we observe all the replicas.
|
|
selector := labels.SelectorFromSet(labels.Set(map[string]string{"name": name}))
|
|
pods, err := framework.PodsCreated(f.ClientSet, f.Namespace.Name, name, replicaCount)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
|
|
// Wait for all of them to be scheduled
|
|
By(fmt.Sprintf("Waiting for %d replicas of %s to be scheduled. Selector: %v", replicaCount, name, selector))
|
|
pods, err = framework.WaitForPodsWithLabelScheduled(f.ClientSet, f.Namespace.Name, selector)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
|
|
// Now make sure they're spread across zones
|
|
zoneNames, err := getZoneNames(f.ClientSet)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(checkZoneSpreading(f.ClientSet, pods, zoneNames)).To(Equal(true))
|
|
}
|