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Merge pull request #47256 from aleksandra-malinowska/autoscaling-system-pods-test

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Automatic merge from submit-queue

Add new e2e test for cluster size autoscaler (evicting system pods)

This test verifies that cluster autoscaler drains nodes with system pods running if they have a PDB.
This commit is contained in:
Kubernetes Submit Queue 2017-06-20 04:09:23 -07:00 committed by GitHub
commit 5e8f44f195
1 changed files with 20 additions and 13 deletions
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33
test/e2e/autoscaling/cluster_size_autoscaling.go
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@ -419,7 +419,7 @@ var _ = framework.KubeDescribe("Cluster size autoscaling [Slow]", func() {
})
It("should be able to scale down when rescheduling a pod is required and pdb allows for it[Feature:ClusterSizeAutoscalingScaleDown]", func() {
runDrainTest(f, originalSizes, 1, 1, func(increasedSize int) {
runDrainTest(f, originalSizes, f.Namespace.Name, 1, 1, func(increasedSize int) {
By("Some node should be removed")
framework.ExpectNoError(WaitForClusterSizeFunc(f.ClientSet,
func(size int) bool { return size < increasedSize }, scaleDownTimeout))
@ -427,7 +427,7 @@ var _ = framework.KubeDescribe("Cluster size autoscaling [Slow]", func() {
})
It("shouldn't be able to scale down when rescheduling a pod is required, but pdb doesn't allow drain[Feature:ClusterSizeAutoscalingScaleDown]", func() {
runDrainTest(f, originalSizes, 1, 0, func(increasedSize int) {
runDrainTest(f, originalSizes, f.Namespace.Name, 1, 0, func(increasedSize int) {
By("No nodes should be removed")
time.Sleep(scaleDownTimeout)
nodes := framework.GetReadySchedulableNodesOrDie(f.ClientSet)
@ -436,7 +436,15 @@ var _ = framework.KubeDescribe("Cluster size autoscaling [Slow]", func() {
})
It("should be able to scale down by draining multiple pods one by one as dictated by pdb[Feature:ClusterSizeAutoscalingScaleDown]", func() {
runDrainTest(f, originalSizes, 2, 1, func(increasedSize int) {
runDrainTest(f, originalSizes, f.Namespace.Name, 2, 1, func(increasedSize int) {
By("Some node should be removed")
framework.ExpectNoError(WaitForClusterSizeFunc(f.ClientSet,
func(size int) bool { return size < increasedSize }, scaleDownTimeout))
})
})
It("should be able to scale down by draining system pods with pdb[Feature:ClusterSizeAutoscalingScaleDown]", func() {
runDrainTest(f, originalSizes, "kube-system", 2, 1, func(increasedSize int) {
By("Some node should be removed")
framework.ExpectNoError(WaitForClusterSizeFunc(f.ClientSet,
func(size int) bool { return size < increasedSize }, scaleDownTimeout))
@ -492,20 +500,19 @@ func execCmd(args ...string) *exec.Cmd {
return exec.Command(args[0], args[1:]...)
}
func runDrainTest(f *framework.Framework, migSizes map[string]int, podsPerNode, pdbSize int, verifyFunction func(int)) {
func runDrainTest(f *framework.Framework, migSizes map[string]int, namespace string, podsPerNode, pdbSize int, verifyFunction func(int)) {
increasedSize := manuallyIncreaseClusterSize(f, migSizes)
nodes, err := f.ClientSet.Core().Nodes().List(metav1.ListOptions{FieldSelector: fields.Set{
"spec.unschedulable": "false",
}.AsSelector().String()})
framework.ExpectNoError(err)
namespace := f.Namespace.Name
numPods := len(nodes.Items) * podsPerNode
testId := string(uuid.NewUUID()) // So that we can label and find pods
labelMap := map[string]string{"test_id": testId}
framework.ExpectNoError(runReplicatedPodOnEachNode(f, nodes.Items, podsPerNode, "reschedulable-pods", labelMap))
framework.ExpectNoError(runReplicatedPodOnEachNode(f, nodes.Items, namespace, podsPerNode, "reschedulable-pods", labelMap))
defer framework.DeleteRCAndPods(f.ClientSet, f.InternalClientset, f.Namespace.Name, "reschedulable-pods")
defer framework.DeleteRCAndPods(f.ClientSet, f.InternalClientset, namespace, "reschedulable-pods")
By("Create a PodDisruptionBudget")
minAvailable := intstr.FromInt(numPods - pdbSize)
@ -898,7 +905,7 @@ func makeNodeSchedulable(c clientset.Interface, node *v1.Node) error {
// 3. for each node:
// 3a. enable scheduling on that node
// 3b. increase number of replicas in RC by podsPerNode
func runReplicatedPodOnEachNode(f *framework.Framework, nodes []v1.Node, podsPerNode int, id string, labels map[string]string) error {
func runReplicatedPodOnEachNode(f *framework.Framework, nodes []v1.Node, namespace string, podsPerNode int, id string, labels map[string]string) error {
By("Run a pod on each node")
for _, node := range nodes {
err := makeNodeUnschedulable(f.ClientSet, &node)
@ -915,7 +922,7 @@ func runReplicatedPodOnEachNode(f *framework.Framework, nodes []v1.Node, podsPer
Client: f.ClientSet,
InternalClient: f.InternalClientset,
Name: id,
Namespace: f.Namespace.Name,
Namespace: namespace,
Timeout: defaultTimeout,
Image: framework.GetPauseImageName(f.ClientSet),
Replicas: 0,
@ -925,7 +932,7 @@ func runReplicatedPodOnEachNode(f *framework.Framework, nodes []v1.Node, podsPer
if err != nil {
return err
}
rc, err := f.ClientSet.Core().ReplicationControllers(f.Namespace.Name).Get(id, metav1.GetOptions{})
rc, err := f.ClientSet.Core().ReplicationControllers(namespace).Get(id, metav1.GetOptions{})
if err != nil {
return err
}
@ -939,7 +946,7 @@ func runReplicatedPodOnEachNode(f *framework.Framework, nodes []v1.Node, podsPer
// (we retry 409 errors in case rc reference got out of sync)
for j := 0; j < 3; j++ {
*rc.Spec.Replicas = int32((i + 1) * podsPerNode)
rc, err = f.ClientSet.Core().ReplicationControllers(f.Namespace.Name).Update(rc)
rc, err = f.ClientSet.Core().ReplicationControllers(namespace).Update(rc)
if err == nil {
break
}
@ -947,14 +954,14 @@ func runReplicatedPodOnEachNode(f *framework.Framework, nodes []v1.Node, podsPer
return err
}
glog.Warningf("Got 409 conflict when trying to scale RC, retries left: %v", 3-j)
rc, err = f.ClientSet.Core().ReplicationControllers(f.Namespace.Name).Get(id, metav1.GetOptions{})
rc, err = f.ClientSet.Core().ReplicationControllers(namespace).Get(id, metav1.GetOptions{})
if err != nil {
return err
}
}
err = wait.PollImmediate(5*time.Second, podTimeout, func() (bool, error) {
rc, err = f.ClientSet.Core().ReplicationControllers(f.Namespace.Name).Get(id, metav1.GetOptions{})
rc, err = f.ClientSet.Core().ReplicationControllers(namespace).Get(id, metav1.GetOptions{})
if err != nil || rc.Status.ReadyReplicas < int32((i+1)*podsPerNode) {
return false, nil
}