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dns_autoscaling.go 12.99 KB
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/*
Copyright 2016 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"
"strings"
"time"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/kubernetes/pkg/api/v1"
"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
"k8s.io/kubernetes/test/e2e/framework"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
const (
DNSdefaultTimeout = 5 * time.Minute
ClusterAddonLabelKey = "k8s-app"
DNSLabelName = "kube-dns"
DNSAutoscalerLabelName = "kube-dns-autoscaler"
)
var _ = framework.KubeDescribe("DNS horizontal autoscaling", func() {
f := framework.NewDefaultFramework("dns-autoscaling")
var c clientset.Interface
var previousParams map[string]string
var originDNSReplicasCount int
var DNSParams_1 DNSParamsLinear
var DNSParams_2 DNSParamsLinear
var DNSParams_3 DNSParamsLinear
BeforeEach(func() {
framework.SkipUnlessProviderIs("gce", "gke")
c = f.ClientSet
nodeCount := len(framework.GetReadySchedulableNodesOrDie(c).Items)
Expect(nodeCount).NotTo(BeZero())
By("Collecting original replicas count and DNS scaling params")
var err error
originDNSReplicasCount, err = getDNSReplicas(c)
Expect(err).NotTo(HaveOccurred())
pcm, err := fetchDNSScalingConfigMap(c)
Expect(err).NotTo(HaveOccurred())
previousParams = pcm.Data
if nodeCount <= 500 {
DNSParams_1 = DNSParamsLinear{
nodesPerReplica: 1,
}
DNSParams_2 = DNSParamsLinear{
nodesPerReplica: 2,
}
DNSParams_3 = DNSParamsLinear{
nodesPerReplica: 3,
coresPerReplica: 3,
}
} else {
// In large clusters, avoid creating/deleting too many DNS pods,
// it is supposed to be correctness test, not performance one.
// The default setup is: 256 cores/replica, 16 nodes/replica.
// With nodeCount > 500, nodes/13, nodes/14, nodes/15 and nodes/16
// are different numbers.
DNSParams_1 = DNSParamsLinear{
nodesPerReplica: 13,
}
DNSParams_2 = DNSParamsLinear{
nodesPerReplica: 14,
}
DNSParams_3 = DNSParamsLinear{
nodesPerReplica: 15,
coresPerReplica: 15,
}
}
})
// This test is separated because it is slow and need to run serially.
// Will take around 5 minutes to run on a 4 nodes cluster.
It("[Serial] [Slow] kube-dns-autoscaler should scale kube-dns pods when cluster size changed", func() {
By("Replace the dns autoscaling parameters with testing parameters")
err := updateDNSScalingConfigMap(c, packDNSScalingConfigMap(packLinearParams(&DNSParams_1)))
Expect(err).NotTo(HaveOccurred())
defer func() {
By("Restoring intial dns autoscaling parameters")
Expect(updateDNSScalingConfigMap(c, packDNSScalingConfigMap(previousParams))).NotTo(HaveOccurred())
By("Wait for number of running and ready kube-dns pods recover")
label := labels.SelectorFromSet(labels.Set(map[string]string{ClusterAddonLabelKey: DNSLabelName}))
_, err := framework.WaitForPodsWithLabelRunningReady(c, metav1.NamespaceSystem, label, originDNSReplicasCount, DNSdefaultTimeout)
Expect(err).NotTo(HaveOccurred())
}()
By("Wait for kube-dns scaled to expected number")
getExpectReplicasLinear := getExpectReplicasFuncLinear(c, &DNSParams_1)
Expect(waitForDNSReplicasSatisfied(c, getExpectReplicasLinear, DNSdefaultTimeout)).NotTo(HaveOccurred())
originalSizes := make(map[string]int)
sum := 0
for _, mig := range strings.Split(framework.TestContext.CloudConfig.NodeInstanceGroup, ",") {
size, err := GroupSize(mig)
Expect(err).NotTo(HaveOccurred())
By(fmt.Sprintf("Initial size of %s: %d", mig, size))
originalSizes[mig] = size
sum += size
}
By("Manually increase cluster size")
increasedSize := 0
increasedSizes := make(map[string]int)
for key, val := range originalSizes {
increasedSizes[key] = val + 1
increasedSize += increasedSizes[key]
}
setMigSizes(increasedSizes)
Expect(WaitForClusterSizeFunc(c,
func(size int) bool { return size == increasedSize }, scaleUpTimeout)).NotTo(HaveOccurred())
By("Wait for kube-dns scaled to expected number")
getExpectReplicasLinear = getExpectReplicasFuncLinear(c, &DNSParams_1)
Expect(waitForDNSReplicasSatisfied(c, getExpectReplicasLinear, DNSdefaultTimeout)).NotTo(HaveOccurred())
By("Replace the dns autoscaling parameters with another testing parameters")
err = updateDNSScalingConfigMap(c, packDNSScalingConfigMap(packLinearParams(&DNSParams_3)))
Expect(err).NotTo(HaveOccurred())
By("Wait for kube-dns scaled to expected number")
getExpectReplicasLinear = getExpectReplicasFuncLinear(c, &DNSParams_3)
Expect(waitForDNSReplicasSatisfied(c, getExpectReplicasLinear, DNSdefaultTimeout)).NotTo(HaveOccurred())
By("Restoring cluster size")
setMigSizes(originalSizes)
Expect(framework.WaitForClusterSize(c, sum, scaleDownTimeout)).NotTo(HaveOccurred())
By("Wait for kube-dns scaled to expected number")
Expect(waitForDNSReplicasSatisfied(c, getExpectReplicasLinear, DNSdefaultTimeout)).NotTo(HaveOccurred())
})
It("kube-dns-autoscaler should scale kube-dns pods in both nonfaulty and faulty scenarios", func() {
By("Replace the dns autoscaling parameters with testing parameters")
err := updateDNSScalingConfigMap(c, packDNSScalingConfigMap(packLinearParams(&DNSParams_1)))
Expect(err).NotTo(HaveOccurred())
defer func() {
By("Restoring intial dns autoscaling parameters")
Expect(updateDNSScalingConfigMap(c, packDNSScalingConfigMap(previousParams))).NotTo(HaveOccurred())
}()
By("Wait for kube-dns scaled to expected number")
getExpectReplicasLinear := getExpectReplicasFuncLinear(c, &DNSParams_1)
Expect(waitForDNSReplicasSatisfied(c, getExpectReplicasLinear, DNSdefaultTimeout)).NotTo(HaveOccurred())
By("--- Scenario: should scale kube-dns based on changed parameters ---")
By("Replace the dns autoscaling parameters with another testing parameters")
err = updateDNSScalingConfigMap(c, packDNSScalingConfigMap(packLinearParams(&DNSParams_3)))
Expect(err).NotTo(HaveOccurred())
By("Wait for kube-dns scaled to expected number")
getExpectReplicasLinear = getExpectReplicasFuncLinear(c, &DNSParams_3)
Expect(waitForDNSReplicasSatisfied(c, getExpectReplicasLinear, DNSdefaultTimeout)).NotTo(HaveOccurred())
By("--- Scenario: should re-create scaling parameters with default value when parameters got deleted ---")
By("Delete the ConfigMap for autoscaler")
err = deleteDNSScalingConfigMap(c)
Expect(err).NotTo(HaveOccurred())
By("Wait for the ConfigMap got re-created")
_, err = waitForDNSConfigMapCreated(c, DNSdefaultTimeout)
Expect(err).NotTo(HaveOccurred())
By("Replace the dns autoscaling parameters with another testing parameters")
err = updateDNSScalingConfigMap(c, packDNSScalingConfigMap(packLinearParams(&DNSParams_2)))
Expect(err).NotTo(HaveOccurred())
By("Wait for kube-dns scaled to expected number")
getExpectReplicasLinear = getExpectReplicasFuncLinear(c, &DNSParams_2)
Expect(waitForDNSReplicasSatisfied(c, getExpectReplicasLinear, DNSdefaultTimeout)).NotTo(HaveOccurred())
By("--- Scenario: should recover after autoscaler pod got deleted ---")
By("Delete the autoscaler pod for kube-dns")
Expect(deleteDNSAutoscalerPod(c)).NotTo(HaveOccurred())
By("Replace the dns autoscaling parameters with another testing parameters")
err = updateDNSScalingConfigMap(c, packDNSScalingConfigMap(packLinearParams(&DNSParams_1)))
Expect(err).NotTo(HaveOccurred())
By("Wait for kube-dns scaled to expected number")
getExpectReplicasLinear = getExpectReplicasFuncLinear(c, &DNSParams_1)
Expect(waitForDNSReplicasSatisfied(c, getExpectReplicasLinear, DNSdefaultTimeout)).NotTo(HaveOccurred())
})
})
type DNSParamsLinear struct {
nodesPerReplica float64
coresPerReplica float64
min int
max int
}
type getExpectReplicasFunc func(c clientset.Interface) int
func getExpectReplicasFuncLinear(c clientset.Interface, params *DNSParamsLinear) getExpectReplicasFunc {
return func(c clientset.Interface) int {
var replicasFromNodes float64
var replicasFromCores float64
nodes := framework.GetReadySchedulableNodesOrDie(c).Items
if params.nodesPerReplica > 0 {
replicasFromNodes = math.Ceil(float64(len(nodes)) / params.nodesPerReplica)
}
if params.coresPerReplica > 0 {
replicasFromCores = math.Ceil(float64(getScheduableCores(nodes)) / params.coresPerReplica)
}
return int(math.Max(1.0, math.Max(replicasFromNodes, replicasFromCores)))
}
}
func getScheduableCores(nodes []v1.Node) int64 {
var sc resource.Quantity
for _, node := range nodes {
if !node.Spec.Unschedulable {
sc.Add(node.Status.Capacity[v1.ResourceCPU])
}
}
scInt64, scOk := sc.AsInt64()
if !scOk {
framework.Logf("Unable to compute integer values of schedulable cores in the cluster")
return 0
}
return scInt64
}
func fetchDNSScalingConfigMap(c clientset.Interface) (*v1.ConfigMap, error) {
cm, err := c.Core().ConfigMaps(metav1.NamespaceSystem).Get(DNSAutoscalerLabelName, metav1.GetOptions{})
if err != nil {
return nil, err
}
return cm, nil
}
func deleteDNSScalingConfigMap(c clientset.Interface) error {
if err := c.Core().ConfigMaps(metav1.NamespaceSystem).Delete(DNSAutoscalerLabelName, nil); err != nil {
return err
}
framework.Logf("DNS autoscaling ConfigMap deleted.")
return nil
}
func packLinearParams(params *DNSParamsLinear) map[string]string {
paramsMap := make(map[string]string)
paramsMap["linear"] = fmt.Sprintf("{\"nodesPerReplica\": %v,\"coresPerReplica\": %v,\"min\": %v,\"max\": %v}",
params.nodesPerReplica,
params.coresPerReplica,
params.min,
params.max)
return paramsMap
}
func packDNSScalingConfigMap(params map[string]string) *v1.ConfigMap {
configMap := v1.ConfigMap{}
configMap.ObjectMeta.Name = DNSAutoscalerLabelName
configMap.ObjectMeta.Namespace = metav1.NamespaceSystem
configMap.Data = params
return &configMap
}
func updateDNSScalingConfigMap(c clientset.Interface, configMap *v1.ConfigMap) error {
_, err := c.Core().ConfigMaps(metav1.NamespaceSystem).Update(configMap)
if err != nil {
return err
}
framework.Logf("DNS autoscaling ConfigMap updated.")
return nil
}
func getDNSReplicas(c clientset.Interface) (int, error) {
label := labels.SelectorFromSet(labels.Set(map[string]string{ClusterAddonLabelKey: DNSLabelName}))
listOpts := metav1.ListOptions{LabelSelector: label.String()}
deployments, err := c.Extensions().Deployments(metav1.NamespaceSystem).List(listOpts)
if err != nil {
return 0, err
}
if len(deployments.Items) != 1 {
return 0, fmt.Errorf("expected 1 DNS deployment, got %v", len(deployments.Items))
}
deployment := deployments.Items[0]
return int(*(deployment.Spec.Replicas)), nil
}
func deleteDNSAutoscalerPod(c clientset.Interface) error {
label := labels.SelectorFromSet(labels.Set(map[string]string{ClusterAddonLabelKey: DNSAutoscalerLabelName}))
listOpts := metav1.ListOptions{LabelSelector: label.String()}
pods, err := c.Core().Pods(metav1.NamespaceSystem).List(listOpts)
if err != nil {
return err
}
if len(pods.Items) != 1 {
return fmt.Errorf("expected 1 autoscaler pod, got %v", len(pods.Items))
}
podName := pods.Items[0].Name
if err := c.Core().Pods(metav1.NamespaceSystem).Delete(podName, nil); err != nil {
return err
}
framework.Logf("DNS autoscaling pod %v deleted.", podName)
return nil
}
func waitForDNSReplicasSatisfied(c clientset.Interface, getExpected getExpectReplicasFunc, timeout time.Duration) (err error) {
var current int
var expected int
framework.Logf("Waiting up to %v for kube-dns to reach expected replicas", timeout)
condition := func() (bool, error) {
current, err = getDNSReplicas(c)
if err != nil {
return false, err
}
expected = getExpected(c)
if current != expected {
framework.Logf("Replicas not as expected: got %v, expected %v", current, expected)
return false, nil
}
return true, nil
}
if err = wait.Poll(2*time.Second, timeout, condition); err != nil {
return fmt.Errorf("err waiting for DNS replicas to satisfy %v, got %v: %v", expected, current, err)
}
framework.Logf("kube-dns reaches expected replicas: %v", expected)
return nil
}
func waitForDNSConfigMapCreated(c clientset.Interface, timeout time.Duration) (configMap *v1.ConfigMap, err error) {
framework.Logf("Waiting up to %v for DNS autoscaling ConfigMap got re-created", timeout)
condition := func() (bool, error) {
configMap, err = fetchDNSScalingConfigMap(c)
if err != nil {
return false, nil
}
return true, nil
}
if err = wait.Poll(time.Second, timeout, condition); err != nil {
return nil, fmt.Errorf("err waiting for DNS autoscaling ConfigMap got re-created: %v", err)
}
return configMap, nil
}
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