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autoscaling_utils.go
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autoscaling_utils.go
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/*
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 common
import (
"context"
"fmt"
"strconv"
"sync"
"time"
autoscalingv1 "k8s.io/api/autoscaling/v1"
"k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/apimachinery/pkg/util/wait"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
"k8s.io/kubernetes/test/e2e/framework"
testutils "k8s.io/kubernetes/test/utils"
. "github.com/onsi/ginkgo"
imageutils "k8s.io/kubernetes/test/utils/image"
)
const (
dynamicConsumptionTimeInSeconds = 30
staticConsumptionTimeInSeconds = 3600
dynamicRequestSizeInMillicores = 20
dynamicRequestSizeInMegabytes = 100
dynamicRequestSizeCustomMetric = 10
port = 80
targetPort = 8080
timeoutRC = 120 * time.Second
startServiceTimeout = time.Minute
startServiceInterval = 5 * time.Second
rcIsNil = "ERROR: replicationController = nil"
deploymentIsNil = "ERROR: deployment = nil"
rsIsNil = "ERROR: replicaset = nil"
invalidKind = "ERROR: invalid workload kind for resource consumer"
customMetricName = "QPS"
serviceInitializationTimeout = 2 * time.Minute
serviceInitializationInterval = 15 * time.Second
)
var (
resourceConsumerImage = imageutils.GetE2EImage(imageutils.ResourceConsumer)
resourceConsumerControllerImage = imageutils.GetE2EImage(imageutils.ResourceController)
)
var (
KindRC = schema.GroupVersionKind{Version: "v1", Kind: "ReplicationController"}
KindDeployment = schema.GroupVersionKind{Group: "apps", Version: "v1beta2", Kind: "Deployment"}
KindReplicaSet = schema.GroupVersionKind{Group: "apps", Version: "v1beta2", Kind: "ReplicaSet"}
subresource = "scale"
)
/*
ResourceConsumer is a tool for testing. It helps create specified usage of CPU or memory (Warning: memory not supported)
typical use case:
rc.ConsumeCPU(600)
// ... check your assumption here
rc.ConsumeCPU(300)
// ... check your assumption here
*/
type ResourceConsumer struct {
name string
controllerName string
kind schema.GroupVersionKind
nsName string
clientSet clientset.Interface
internalClientset *internalclientset.Clientset
cpu chan int
mem chan int
customMetric chan int
stopCPU chan int
stopMem chan int
stopCustomMetric chan int
stopWaitGroup sync.WaitGroup
consumptionTimeInSeconds int
sleepTime time.Duration
requestSizeInMillicores int
requestSizeInMegabytes int
requestSizeCustomMetric int
}
func GetResourceConsumerImage() string {
return resourceConsumerImage
}
func NewDynamicResourceConsumer(name, nsName string, kind schema.GroupVersionKind, replicas, initCPUTotal, initMemoryTotal, initCustomMetric int, cpuLimit, memLimit int64, clientset clientset.Interface, internalClientset *internalclientset.Clientset) *ResourceConsumer {
return newResourceConsumer(name, nsName, kind, replicas, initCPUTotal, initMemoryTotal, initCustomMetric, dynamicConsumptionTimeInSeconds,
dynamicRequestSizeInMillicores, dynamicRequestSizeInMegabytes, dynamicRequestSizeCustomMetric, cpuLimit, memLimit, clientset, internalClientset)
}
// TODO this still defaults to replication controller
func NewStaticResourceConsumer(name, nsName string, replicas, initCPUTotal, initMemoryTotal, initCustomMetric int, cpuLimit, memLimit int64, clientset clientset.Interface, internalClientset *internalclientset.Clientset) *ResourceConsumer {
return newResourceConsumer(name, nsName, KindRC, replicas, initCPUTotal, initMemoryTotal, initCustomMetric, staticConsumptionTimeInSeconds,
initCPUTotal/replicas, initMemoryTotal/replicas, initCustomMetric/replicas, cpuLimit, memLimit, clientset, internalClientset)
}
/*
NewResourceConsumer creates new ResourceConsumer
initCPUTotal argument is in millicores
initMemoryTotal argument is in megabytes
memLimit argument is in megabytes, memLimit is a maximum amount of memory that can be consumed by a single pod
cpuLimit argument is in millicores, cpuLimit is a maximum amount of cpu that can be consumed by a single pod
*/
func newResourceConsumer(name, nsName string, kind schema.GroupVersionKind, replicas, initCPUTotal, initMemoryTotal, initCustomMetric, consumptionTimeInSeconds, requestSizeInMillicores,
requestSizeInMegabytes int, requestSizeCustomMetric int, cpuLimit, memLimit int64, clientset clientset.Interface, internalClientset *internalclientset.Clientset) *ResourceConsumer {
runServiceAndWorkloadForResourceConsumer(clientset, internalClientset, nsName, name, kind, replicas, cpuLimit, memLimit)
rc := &ResourceConsumer{
name: name,
controllerName: name + "-ctrl",
kind: kind,
nsName: nsName,
clientSet: clientset,
internalClientset: internalClientset,
cpu: make(chan int),
mem: make(chan int),
customMetric: make(chan int),
stopCPU: make(chan int),
stopMem: make(chan int),
stopCustomMetric: make(chan int),
consumptionTimeInSeconds: consumptionTimeInSeconds,
sleepTime: time.Duration(consumptionTimeInSeconds) * time.Second,
requestSizeInMillicores: requestSizeInMillicores,
requestSizeInMegabytes: requestSizeInMegabytes,
requestSizeCustomMetric: requestSizeCustomMetric,
}
go rc.makeConsumeCPURequests()
rc.ConsumeCPU(initCPUTotal)
go rc.makeConsumeMemRequests()
rc.ConsumeMem(initMemoryTotal)
go rc.makeConsumeCustomMetric()
rc.ConsumeCustomMetric(initCustomMetric)
return rc
}
// ConsumeCPU consumes given number of CPU
func (rc *ResourceConsumer) ConsumeCPU(millicores int) {
framework.Logf("RC %s: consume %v millicores in total", rc.name, millicores)
rc.cpu <- millicores
}
// ConsumeMem consumes given number of Mem
func (rc *ResourceConsumer) ConsumeMem(megabytes int) {
framework.Logf("RC %s: consume %v MB in total", rc.name, megabytes)
rc.mem <- megabytes
}
// ConsumeMem consumes given number of custom metric
func (rc *ResourceConsumer) ConsumeCustomMetric(amount int) {
framework.Logf("RC %s: consume custom metric %v in total", rc.name, amount)
rc.customMetric <- amount
}
func (rc *ResourceConsumer) makeConsumeCPURequests() {
defer GinkgoRecover()
rc.stopWaitGroup.Add(1)
defer rc.stopWaitGroup.Done()
sleepTime := time.Duration(0)
millicores := 0
for {
select {
case millicores = <-rc.cpu:
framework.Logf("RC %s: setting consumption to %v millicores in total", rc.name, millicores)
case <-time.After(sleepTime):
framework.Logf("RC %s: sending request to consume %d millicores", rc.name, millicores)
rc.sendConsumeCPURequest(millicores)
sleepTime = rc.sleepTime
case <-rc.stopCPU:
framework.Logf("RC %s: stopping CPU consumer", rc.name)
return
}
}
}
func (rc *ResourceConsumer) makeConsumeMemRequests() {
defer GinkgoRecover()
rc.stopWaitGroup.Add(1)
defer rc.stopWaitGroup.Done()
sleepTime := time.Duration(0)
megabytes := 0
for {
select {
case megabytes = <-rc.mem:
framework.Logf("RC %s: setting consumption to %v MB in total", rc.name, megabytes)
case <-time.After(sleepTime):
framework.Logf("RC %s: sending request to consume %d MB", rc.name, megabytes)
rc.sendConsumeMemRequest(megabytes)
sleepTime = rc.sleepTime
case <-rc.stopMem:
framework.Logf("RC %s: stopping mem consumer", rc.name)
return
}
}
}
func (rc *ResourceConsumer) makeConsumeCustomMetric() {
defer GinkgoRecover()
rc.stopWaitGroup.Add(1)
defer rc.stopWaitGroup.Done()
sleepTime := time.Duration(0)
delta := 0
for {
select {
case delta := <-rc.customMetric:
framework.Logf("RC %s: setting bump of metric %s to %d in total", rc.name, customMetricName, delta)
case <-time.After(sleepTime):
framework.Logf("RC %s: sending request to consume %d of custom metric %s", rc.name, delta, customMetricName)
rc.sendConsumeCustomMetric(delta)
sleepTime = rc.sleepTime
case <-rc.stopCustomMetric:
framework.Logf("RC %s: stopping metric consumer", rc.name)
return
}
}
}
func (rc *ResourceConsumer) sendConsumeCPURequest(millicores int) {
ctx, cancel := context.WithTimeout(context.Background(), framework.SingleCallTimeout)
defer cancel()
err := wait.PollImmediate(serviceInitializationInterval, serviceInitializationTimeout, func() (bool, error) {
proxyRequest, err := framework.GetServicesProxyRequest(rc.clientSet, rc.clientSet.Core().RESTClient().Post())
framework.ExpectNoError(err)
req := proxyRequest.Namespace(rc.nsName).
Context(ctx).
Name(rc.controllerName).
Suffix("ConsumeCPU").
Param("millicores", strconv.Itoa(millicores)).
Param("durationSec", strconv.Itoa(rc.consumptionTimeInSeconds)).
Param("requestSizeMillicores", strconv.Itoa(rc.requestSizeInMillicores))
framework.Logf("ConsumeCPU URL: %v", *req.URL())
_, err = req.DoRaw()
if err != nil {
framework.Logf("ConsumeCPU failure: %v", err)
return false, nil
}
return true, nil
})
framework.ExpectNoError(err)
}
// sendConsumeMemRequest sends POST request for memory consumption
func (rc *ResourceConsumer) sendConsumeMemRequest(megabytes int) {
ctx, cancel := context.WithTimeout(context.Background(), framework.SingleCallTimeout)
defer cancel()
err := wait.PollImmediate(serviceInitializationInterval, serviceInitializationTimeout, func() (bool, error) {
proxyRequest, err := framework.GetServicesProxyRequest(rc.clientSet, rc.clientSet.Core().RESTClient().Post())
framework.ExpectNoError(err)
req := proxyRequest.Namespace(rc.nsName).
Context(ctx).
Name(rc.controllerName).
Suffix("ConsumeMem").
Param("megabytes", strconv.Itoa(megabytes)).
Param("durationSec", strconv.Itoa(rc.consumptionTimeInSeconds)).
Param("requestSizeMegabytes", strconv.Itoa(rc.requestSizeInMegabytes))
framework.Logf("ConsumeMem URL: %v", *req.URL())
_, err = req.DoRaw()
if err != nil {
framework.Logf("ConsumeMem failure: %v", err)
return false, nil
}
return true, nil
})
framework.ExpectNoError(err)
}
// sendConsumeCustomMetric sends POST request for custom metric consumption
func (rc *ResourceConsumer) sendConsumeCustomMetric(delta int) {
ctx, cancel := context.WithTimeout(context.Background(), framework.SingleCallTimeout)
defer cancel()
err := wait.PollImmediate(serviceInitializationInterval, serviceInitializationTimeout, func() (bool, error) {
proxyRequest, err := framework.GetServicesProxyRequest(rc.clientSet, rc.clientSet.Core().RESTClient().Post())
framework.ExpectNoError(err)
req := proxyRequest.Namespace(rc.nsName).
Context(ctx).
Name(rc.controllerName).
Suffix("BumpMetric").
Param("metric", customMetricName).
Param("delta", strconv.Itoa(delta)).
Param("durationSec", strconv.Itoa(rc.consumptionTimeInSeconds)).
Param("requestSizeMetrics", strconv.Itoa(rc.requestSizeCustomMetric))
framework.Logf("ConsumeCustomMetric URL: %v", *req.URL())
_, err = req.DoRaw()
if err != nil {
framework.Logf("ConsumeCustomMetric failure: %v", err)
return false, nil
}
return true, nil
})
framework.ExpectNoError(err)
}
func (rc *ResourceConsumer) GetReplicas() int {
switch rc.kind {
case KindRC:
replicationController, err := rc.clientSet.Core().ReplicationControllers(rc.nsName).Get(rc.name, metav1.GetOptions{})
framework.ExpectNoError(err)
if replicationController == nil {
framework.Failf(rcIsNil)
}
return int(replicationController.Status.ReadyReplicas)
case KindDeployment:
deployment, err := rc.clientSet.Extensions().Deployments(rc.nsName).Get(rc.name, metav1.GetOptions{})
framework.ExpectNoError(err)
if deployment == nil {
framework.Failf(deploymentIsNil)
}
return int(deployment.Status.ReadyReplicas)
case KindReplicaSet:
rs, err := rc.clientSet.Extensions().ReplicaSets(rc.nsName).Get(rc.name, metav1.GetOptions{})
framework.ExpectNoError(err)
if rs == nil {
framework.Failf(rsIsNil)
}
return int(rs.Status.ReadyReplicas)
default:
framework.Failf(invalidKind)
}
return 0
}
func (rc *ResourceConsumer) WaitForReplicas(desiredReplicas int, duration time.Duration) {
interval := 20 * time.Second
err := wait.PollImmediate(interval, duration, func() (bool, error) {
replicas := rc.GetReplicas()
framework.Logf("waiting for %d replicas (current: %d)", desiredReplicas, replicas)
return replicas == desiredReplicas, nil // Expected number of replicas found. Exit.
})
framework.ExpectNoErrorWithOffset(1, err, "timeout waiting %v for %d replicas", duration, desiredReplicas)
}
func (rc *ResourceConsumer) EnsureDesiredReplicas(desiredReplicas int, duration time.Duration) {
interval := 10 * time.Second
err := wait.PollImmediate(interval, duration, func() (bool, error) {
replicas := rc.GetReplicas()
framework.Logf("expecting there to be %d replicas (are: %d)", desiredReplicas, replicas)
if replicas != desiredReplicas {
return false, fmt.Errorf("number of replicas changed unexpectedly")
} else {
return false, nil // Expected number of replicas found. Continue polling until timeout.
}
})
// The call above always returns an error, but if it is timeout, it's OK (condition satisfied all the time).
if err == wait.ErrWaitTimeout {
framework.Logf("Number of replicas was stable over %v", duration)
return
}
framework.ExpectNoErrorWithOffset(1, err)
}
// Pause stops background goroutines responsible for consuming resources.
func (rc *ResourceConsumer) Pause() {
By(fmt.Sprintf("HPA pausing RC %s", rc.name))
rc.stopCPU <- 0
rc.stopMem <- 0
rc.stopCustomMetric <- 0
rc.stopWaitGroup.Wait()
}
// Pause starts background goroutines responsible for consuming resources.
func (rc *ResourceConsumer) Resume() {
By(fmt.Sprintf("HPA resuming RC %s", rc.name))
go rc.makeConsumeCPURequests()
go rc.makeConsumeMemRequests()
go rc.makeConsumeCustomMetric()
}
func (rc *ResourceConsumer) CleanUp() {
By(fmt.Sprintf("Removing consuming RC %s", rc.name))
close(rc.stopCPU)
close(rc.stopMem)
close(rc.stopCustomMetric)
rc.stopWaitGroup.Wait()
// Wait some time to ensure all child goroutines are finished.
time.Sleep(10 * time.Second)
kind := rc.kind.GroupKind()
framework.ExpectNoError(framework.DeleteResourceAndPods(rc.clientSet, rc.internalClientset, kind, rc.nsName, rc.name))
framework.ExpectNoError(rc.clientSet.Core().Services(rc.nsName).Delete(rc.name, nil))
framework.ExpectNoError(framework.DeleteResourceAndPods(rc.clientSet, rc.internalClientset, api.Kind("ReplicationController"), rc.nsName, rc.controllerName))
framework.ExpectNoError(rc.clientSet.Core().Services(rc.nsName).Delete(rc.controllerName, nil))
}
func runServiceAndWorkloadForResourceConsumer(c clientset.Interface, internalClient internalclientset.Interface, ns, name string, kind schema.GroupVersionKind, replicas int, cpuLimitMillis, memLimitMb int64) {
By(fmt.Sprintf("Running consuming RC %s via %s with %v replicas", name, kind, replicas))
_, err := c.Core().Services(ns).Create(&v1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: name,
},
Spec: v1.ServiceSpec{
Ports: []v1.ServicePort{{
Port: port,
TargetPort: intstr.FromInt(targetPort),
}},
Selector: map[string]string{
"name": name,
},
},
})
framework.ExpectNoError(err)
rcConfig := testutils.RCConfig{
Client: c,
InternalClient: internalClient,
Image: resourceConsumerImage,
Name: name,
Namespace: ns,
Timeout: timeoutRC,
Replicas: replicas,
CpuRequest: cpuLimitMillis,
CpuLimit: cpuLimitMillis,
MemRequest: memLimitMb * 1024 * 1024, // MemLimit is in bytes
MemLimit: memLimitMb * 1024 * 1024,
}
switch kind {
case KindRC:
framework.ExpectNoError(framework.RunRC(rcConfig))
break
case KindDeployment:
dpConfig := testutils.DeploymentConfig{
RCConfig: rcConfig,
}
framework.ExpectNoError(framework.RunDeployment(dpConfig))
break
case KindReplicaSet:
rsConfig := testutils.ReplicaSetConfig{
RCConfig: rcConfig,
}
By(fmt.Sprintf("creating replicaset %s in namespace %s", rsConfig.Name, rsConfig.Namespace))
framework.ExpectNoError(framework.RunReplicaSet(rsConfig))
break
default:
framework.Failf(invalidKind)
}
By(fmt.Sprintf("Running controller"))
controllerName := name + "-ctrl"
_, err = c.Core().Services(ns).Create(&v1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: controllerName,
},
Spec: v1.ServiceSpec{
Ports: []v1.ServicePort{{
Port: port,
TargetPort: intstr.FromInt(targetPort),
}},
Selector: map[string]string{
"name": controllerName,
},
},
})
framework.ExpectNoError(err)
dnsClusterFirst := v1.DNSClusterFirst
controllerRcConfig := testutils.RCConfig{
Client: c,
Image: resourceConsumerControllerImage,
Name: controllerName,
Namespace: ns,
Timeout: timeoutRC,
Replicas: 1,
Command: []string{"/controller", "--consumer-service-name=" + name, "--consumer-service-namespace=" + ns, "--consumer-port=80"},
DNSPolicy: &dnsClusterFirst,
}
framework.ExpectNoError(framework.RunRC(controllerRcConfig))
// Wait for endpoints to propagate for the controller service.
framework.ExpectNoError(framework.WaitForServiceEndpointsNum(
c, ns, controllerName, 1, startServiceInterval, startServiceTimeout))
}
func CreateCPUHorizontalPodAutoscaler(rc *ResourceConsumer, cpu, minReplicas, maxRepl int32) *autoscalingv1.HorizontalPodAutoscaler {
hpa := &autoscalingv1.HorizontalPodAutoscaler{
ObjectMeta: metav1.ObjectMeta{
Name: rc.name,
Namespace: rc.nsName,
},
Spec: autoscalingv1.HorizontalPodAutoscalerSpec{
ScaleTargetRef: autoscalingv1.CrossVersionObjectReference{
APIVersion: rc.kind.GroupVersion().String(),
Kind: rc.kind.Kind,
Name: rc.name,
},
MinReplicas: &minReplicas,
MaxReplicas: maxRepl,
TargetCPUUtilizationPercentage: &cpu,
},
}
hpa, errHPA := rc.clientSet.Autoscaling().HorizontalPodAutoscalers(rc.nsName).Create(hpa)
framework.ExpectNoError(errHPA)
return hpa
}
func DeleteHorizontalPodAutoscaler(rc *ResourceConsumer, autoscalerName string) {
rc.clientSet.Autoscaling().HorizontalPodAutoscalers(rc.nsName).Delete(autoscalerName, nil)
}