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clusterautoscaler.go
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clusterautoscaler.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
/**
Overview
- Tests Shoot cluster autoscaling
AfterSuite
- Cleanup Workload in Shoot
Test:
1. Create a Deployment with affinity that does not allow Pods to be co-located in the same Node
2. Scale up the Deployment and see one Node added (because of the Pod affinity)
3. Scale down the Deployment and see one Node removed (after spec.kubernetes.clusterAutoscaler.scaleDownUnneededTime|scaleDownDelayAfterAdd)
Expected Output
- Scale-up/down should work properly
**/
package operations
import (
"context"
"time"
"github.com/onsi/ginkgo/v2"
"github.com/onsi/gomega"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/test/framework"
"github.com/gardener/gardener/test/framework/resources/templates"
)
const (
podAntiAffinityDeploymentName = "pod-anti-affinity"
podAntiAffinityDeploymentNamespace = metav1.NamespaceDefault
scaleDownDelayAfterAdd = 1 * time.Minute
scaleDownUnneededTime = 1 * time.Minute
testTimeout = 60 * time.Minute
scaleUpTimeout = 20 * time.Minute
scaleDownTimeout = 20 * time.Minute
cleanupTimeout = 20 * time.Minute
)
var _ = ginkgo.Describe("Shoot clusterautoscaler testing", func() {
var (
f = framework.NewShootFramework(nil)
testWorkerPoolName = "ca-test"
origClusterAutoscalerConfig *gardencorev1beta1.ClusterAutoscaler
origWorkers []gardencorev1beta1.Worker
origMinWorkers int32
origMaxWorkers int32
)
f.Default().Serial().CIt("should autoscale a single worker group", func(ctx context.Context) {
var (
shoot = f.Shoot
workerPoolName = shoot.Spec.Provider.Workers[0].Name
)
origClusterAutoscalerConfig = shoot.Spec.Kubernetes.ClusterAutoscaler.DeepCopy()
origMinWorkers = shoot.Spec.Provider.Workers[0].Minimum
origMaxWorkers = shoot.Spec.Provider.Workers[0].Maximum
ginkgo.By("Update shoot spec for test")
// set clusterautoscaler params to lower values so we don't have to wait too long
// and ensure the worker pool has maximum > minimum
err := f.UpdateShoot(ctx, func(s *gardencorev1beta1.Shoot) error {
if s.Spec.Kubernetes.ClusterAutoscaler == nil {
s.Spec.Kubernetes.ClusterAutoscaler = &gardencorev1beta1.ClusterAutoscaler{}
}
s.Spec.Kubernetes.ClusterAutoscaler.ScaleDownDelayAfterAdd = &metav1.Duration{Duration: scaleDownDelayAfterAdd}
s.Spec.Kubernetes.ClusterAutoscaler.ScaleDownUnneededTime = &metav1.Duration{Duration: scaleDownUnneededTime}
if origMaxWorkers != origMinWorkers+1 {
s.Spec.Provider.Workers[0].Maximum = origMinWorkers + 1
}
return nil
})
framework.ExpectNoError(err)
ginkgo.By("Create pod-anti-affinity deployment")
values := podAntiAffinityValues{
Name: podAntiAffinityDeploymentName,
Namespace: podAntiAffinityDeploymentNamespace,
Replicas: origMinWorkers,
WorkerPool: workerPoolName,
}
err = f.RenderAndDeployTemplate(ctx, f.ShootClient, templates.PodAntiAffinityDeploymentName, values)
framework.ExpectNoError(err)
err = f.WaitUntilDeploymentIsReady(ctx, values.Name, values.Namespace, f.ShootClient)
framework.ExpectNoError(err)
ginkgo.By("Scale up pod-anti-affinity deployment")
err = kubernetes.ScaleDeployment(ctx, f.ShootClient.Client(), client.ObjectKey{Namespace: values.Namespace, Name: values.Name}, origMinWorkers+1)
framework.ExpectNoError(err)
ginkgo.By("Ensure one node should be added to the worker pool")
err = framework.WaitForNNodesToBeHealthyInWorkerPool(ctx, f.ShootClient, int(origMinWorkers+1), &workerPoolName, scaleUpTimeout)
framework.ExpectNoError(err)
ginkgo.By("Ensure that pod-anti-affinity deployment is healthy again")
err = f.WaitUntilDeploymentIsReady(ctx, values.Name, values.Namespace, f.ShootClient)
framework.ExpectNoError(err)
ginkgo.By("Scale down pod-anti-affinity deployment")
err = kubernetes.ScaleDeployment(ctx, f.ShootClient.Client(), client.ObjectKey{Namespace: values.Namespace, Name: values.Name}, origMinWorkers)
framework.ExpectNoError(err)
ginkgo.By("Ensure that one node was removed from the worker pool")
err = framework.WaitForNNodesToBeHealthyInWorkerPool(ctx, f.ShootClient, int(origMinWorkers), &workerPoolName, scaleDownTimeout)
framework.ExpectNoError(err)
}, testTimeout, framework.WithCAfterTest(func(ctx context.Context) {
ginkgo.By("Revert shoot spec changes by test")
err := f.UpdateShoot(ctx, func(s *gardencorev1beta1.Shoot) error {
s.Spec.Kubernetes.ClusterAutoscaler = origClusterAutoscalerConfig
s.Spec.Provider.Workers[0].Maximum = origMaxWorkers
return nil
})
framework.ExpectNoError(err)
ginkgo.By("Delete pod-anti-affinity deployment")
err = kubernetesutils.DeleteObject(ctx, f.ShootClient.Client(), &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: podAntiAffinityDeploymentName,
Namespace: podAntiAffinityDeploymentNamespace,
},
})
framework.ExpectNoError(err)
}, cleanupTimeout))
f.Default().Serial().CIt("should autoscale a single worker group to/from zero", func(ctx context.Context) {
var shoot = f.Shoot
origClusterAutoscalerConfig = shoot.Spec.Kubernetes.ClusterAutoscaler.DeepCopy()
origWorkers = shoot.Spec.Provider.Workers
// Create a dedicated worker-pool for cluster autoscaler.
testWorkerPool := origWorkers[0]
testWorkerPool.Name = testWorkerPoolName
testWorkerPool.Minimum = 0
testWorkerPool.Maximum = 2
testWorkerPool.Taints = []corev1.Taint{
{
Key: testWorkerPoolName,
Effect: corev1.TaintEffectNoSchedule,
Value: testWorkerPoolName,
},
}
ginkgo.By("Update shoot spec for test")
err := f.UpdateShoot(ctx, func(s *gardencorev1beta1.Shoot) error {
s.Spec.Provider.Workers = append(shoot.Spec.Provider.Workers, testWorkerPool)
if s.Spec.Kubernetes.ClusterAutoscaler == nil {
s.Spec.Kubernetes.ClusterAutoscaler = &gardencorev1beta1.ClusterAutoscaler{}
}
s.Spec.Kubernetes.ClusterAutoscaler.ScaleDownDelayAfterAdd = &metav1.Duration{Duration: scaleDownDelayAfterAdd}
s.Spec.Kubernetes.ClusterAutoscaler.ScaleDownUnneededTime = &metav1.Duration{Duration: scaleDownUnneededTime}
return nil
})
framework.ExpectNoError(err)
nodeList, err := framework.GetAllNodesInWorkerPool(ctx, f.ShootClient, &testWorkerPoolName)
framework.ExpectNoError(err)
nodeCount := len(nodeList.Items)
gomega.Expect(nodeCount).To(gomega.BeEquivalentTo(testWorkerPool.Minimum), "shoot should have minimum node count before the test")
ginkgo.By("Create pod-anti-affinity deployment")
values := podAntiAffinityValues{
Name: podAntiAffinityDeploymentName,
Namespace: podAntiAffinityDeploymentNamespace,
Replicas: 0, // This is to test the scale-from-zero.
WorkerPool: testWorkerPoolName,
TolerationKey: testWorkerPoolName,
}
err = f.RenderAndDeployTemplate(ctx, f.ShootClient, templates.PodAntiAffinityDeploymentName, values)
framework.ExpectNoError(err)
err = f.WaitUntilDeploymentIsReady(ctx, values.Name, values.Namespace, f.ShootClient)
framework.ExpectNoError(err)
ginkgo.By("Scale up pod-anti-affinity deployment")
err = kubernetes.ScaleDeployment(ctx, f.ShootClient.Client(), client.ObjectKey{Namespace: values.Namespace, Name: values.Name}, 1)
framework.ExpectNoError(err)
ginkgo.By("One node should be added to the worker pool")
err = framework.WaitForNNodesToBeHealthyInWorkerPool(ctx, f.ShootClient, 1, &testWorkerPoolName, scaleUpTimeout)
framework.ExpectNoError(err)
ginkgo.By("Pod-anti-affinity deployment should get healthy again")
err = f.WaitUntilDeploymentIsReady(ctx, values.Name, values.Namespace, f.ShootClient)
framework.ExpectNoError(err)
ginkgo.By("Scale down pod-anti-affinity deployment")
err = kubernetes.ScaleDeployment(ctx, f.ShootClient.Client(), client.ObjectKey{Namespace: values.Namespace, Name: values.Name}, 0)
framework.ExpectNoError(err)
ginkgo.By("Worker pool should be scaled-down to 0")
err = framework.WaitForNNodesToBeHealthyInWorkerPool(ctx, f.ShootClient, 0, &testWorkerPoolName, scaleDownTimeout)
framework.ExpectNoError(err)
}, testTimeout, framework.WithCAfterTest(func(ctx context.Context) {
ginkgo.By("Revert shoot spec changes by test")
err := f.UpdateShoot(ctx, func(s *gardencorev1beta1.Shoot) error {
s.Spec.Kubernetes.ClusterAutoscaler = origClusterAutoscalerConfig
for i, worker := range s.Spec.Provider.Workers {
if worker.Name == testWorkerPoolName {
// Remove the dedicated ca-test workerpool
s.Spec.Provider.Workers[i] = s.Spec.Provider.Workers[len(s.Spec.Provider.Workers)-1]
s.Spec.Provider.Workers = s.Spec.Provider.Workers[:len(s.Spec.Provider.Workers)-1]
break
}
}
return nil
})
framework.ExpectNoError(err)
ginkgo.By("Delete pod-anti-affinity deployment")
err = kubernetesutils.DeleteObject(ctx, f.ShootClient.Client(), &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: podAntiAffinityDeploymentName,
Namespace: podAntiAffinityDeploymentNamespace,
},
})
framework.ExpectNoError(err)
}, cleanupTimeout))
})
type podAntiAffinityValues struct {
Name string
Namespace string
Replicas int32
WorkerPool string
TolerationKey string
}