mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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554 lines
18 KiB
Go
554 lines
18 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package disruption
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import (
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"fmt"
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"reflect"
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"runtime/debug"
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"testing"
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"time"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/apimachinery/registered"
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extensions "k8s.io/kubernetes/pkg/apis/extensions/v1beta1"
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metav1 "k8s.io/kubernetes/pkg/apis/meta/v1"
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policy "k8s.io/kubernetes/pkg/apis/policy/v1beta1"
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"k8s.io/kubernetes/pkg/client/cache"
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"k8s.io/kubernetes/pkg/client/record"
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"k8s.io/kubernetes/pkg/controller"
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"k8s.io/kubernetes/pkg/util/intstr"
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"k8s.io/kubernetes/pkg/util/uuid"
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"k8s.io/kubernetes/pkg/util/workqueue"
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)
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type pdbStates map[string]policy.PodDisruptionBudget
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func (ps *pdbStates) Set(pdb *policy.PodDisruptionBudget) error {
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key, err := controller.KeyFunc(pdb)
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if err != nil {
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return err
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}
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obj, err := api.Scheme.DeepCopy(pdb)
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if err != nil {
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return err
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}
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(*ps)[key] = *obj.(*policy.PodDisruptionBudget)
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return nil
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}
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func (ps *pdbStates) Get(key string) policy.PodDisruptionBudget {
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return (*ps)[key]
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}
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func (ps *pdbStates) VerifyPdbStatus(t *testing.T, key string, disruptionsAllowed, currentHealthy, desiredHealthy, expectedPods int32,
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disruptedPodMap map[string]metav1.Time) {
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actualPDB := ps.Get(key)
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expectedStatus := policy.PodDisruptionBudgetStatus{
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PodDisruptionsAllowed: disruptionsAllowed,
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CurrentHealthy: currentHealthy,
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DesiredHealthy: desiredHealthy,
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ExpectedPods: expectedPods,
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DisruptedPods: disruptedPodMap,
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ObservedGeneration: actualPDB.Generation,
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}
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actualStatus := actualPDB.Status
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if !reflect.DeepEqual(actualStatus, expectedStatus) {
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debug.PrintStack()
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t.Fatalf("PDB %q status mismatch. Expected %+v but got %+v.", key, expectedStatus, actualStatus)
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}
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}
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func (ps *pdbStates) VerifyDisruptionAllowed(t *testing.T, key string, disruptionsAllowed int32) {
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pdb := ps.Get(key)
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if pdb.Status.PodDisruptionsAllowed != disruptionsAllowed {
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debug.PrintStack()
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t.Fatalf("PodDisruptionAllowed mismatch for PDB %q. Expected %v but got %v.", key, disruptionsAllowed, pdb.Status.PodDisruptionsAllowed)
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}
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}
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func newFakeDisruptionController() (*DisruptionController, *pdbStates) {
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ps := &pdbStates{}
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dc := &DisruptionController{
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pdbLister: cache.StoreToPodDisruptionBudgetLister{Store: cache.NewStore(controller.KeyFunc)},
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podLister: cache.StoreToPodLister{Indexer: cache.NewIndexer(controller.KeyFunc, cache.Indexers{})},
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rcLister: cache.StoreToReplicationControllerLister{Indexer: cache.NewIndexer(controller.KeyFunc, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})},
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rsLister: cache.StoreToReplicaSetLister{Indexer: cache.NewIndexer(controller.KeyFunc, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})},
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dLister: cache.StoreToDeploymentLister{Indexer: cache.NewIndexer(controller.KeyFunc, cache.Indexers{})},
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getUpdater: func() updater { return ps.Set },
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broadcaster: record.NewBroadcaster(),
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}
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dc.recorder = dc.broadcaster.NewRecorder(v1.EventSource{Component: "disruption_test"})
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return dc, ps
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}
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func fooBar() map[string]string {
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return map[string]string{"foo": "bar"}
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}
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func newSel(labels map[string]string) *metav1.LabelSelector {
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return &metav1.LabelSelector{MatchLabels: labels}
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}
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func newSelFooBar() *metav1.LabelSelector {
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return newSel(map[string]string{"foo": "bar"})
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}
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func newPodDisruptionBudget(t *testing.T, minAvailable intstr.IntOrString) (*policy.PodDisruptionBudget, string) {
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pdb := &policy.PodDisruptionBudget{
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TypeMeta: metav1.TypeMeta{APIVersion: registered.GroupOrDie(v1.GroupName).GroupVersion.String()},
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ObjectMeta: v1.ObjectMeta{
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UID: uuid.NewUUID(),
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Name: "foobar",
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Namespace: v1.NamespaceDefault,
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ResourceVersion: "18",
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},
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Spec: policy.PodDisruptionBudgetSpec{
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MinAvailable: minAvailable,
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Selector: newSelFooBar(),
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},
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}
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pdbName, err := controller.KeyFunc(pdb)
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if err != nil {
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t.Fatalf("Unexpected error naming pdb %q: %v", pdb.Name, err)
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}
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return pdb, pdbName
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}
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func newPod(t *testing.T, name string) (*v1.Pod, string) {
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pod := &v1.Pod{
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TypeMeta: metav1.TypeMeta{APIVersion: registered.GroupOrDie(v1.GroupName).GroupVersion.String()},
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ObjectMeta: v1.ObjectMeta{
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UID: uuid.NewUUID(),
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Annotations: make(map[string]string),
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Name: name,
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Namespace: v1.NamespaceDefault,
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ResourceVersion: "18",
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Labels: fooBar(),
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},
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Spec: v1.PodSpec{},
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Status: v1.PodStatus{
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Conditions: []v1.PodCondition{
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{Type: v1.PodReady, Status: v1.ConditionTrue},
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},
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},
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}
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podName, err := controller.KeyFunc(pod)
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if err != nil {
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t.Fatalf("Unexpected error naming pod %q: %v", pod.Name, err)
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}
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return pod, podName
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}
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func newReplicationController(t *testing.T, size int32) (*v1.ReplicationController, string) {
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rc := &v1.ReplicationController{
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TypeMeta: metav1.TypeMeta{APIVersion: registered.GroupOrDie(v1.GroupName).GroupVersion.String()},
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ObjectMeta: v1.ObjectMeta{
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UID: uuid.NewUUID(),
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Name: "foobar",
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Namespace: v1.NamespaceDefault,
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ResourceVersion: "18",
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Labels: fooBar(),
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},
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Spec: v1.ReplicationControllerSpec{
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Replicas: &size,
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Selector: fooBar(),
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},
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}
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rcName, err := controller.KeyFunc(rc)
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if err != nil {
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t.Fatalf("Unexpected error naming RC %q", rc.Name)
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}
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return rc, rcName
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}
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func newDeployment(t *testing.T, size int32) (*extensions.Deployment, string) {
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d := &extensions.Deployment{
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TypeMeta: metav1.TypeMeta{APIVersion: registered.GroupOrDie(v1.GroupName).GroupVersion.String()},
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ObjectMeta: v1.ObjectMeta{
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UID: uuid.NewUUID(),
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Name: "foobar",
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Namespace: v1.NamespaceDefault,
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ResourceVersion: "18",
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Labels: fooBar(),
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},
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Spec: extensions.DeploymentSpec{
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Replicas: &size,
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Selector: newSelFooBar(),
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},
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}
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dName, err := controller.KeyFunc(d)
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if err != nil {
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t.Fatalf("Unexpected error naming Deployment %q: %v", d.Name, err)
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}
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return d, dName
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}
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func newReplicaSet(t *testing.T, size int32) (*extensions.ReplicaSet, string) {
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rs := &extensions.ReplicaSet{
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TypeMeta: metav1.TypeMeta{APIVersion: registered.GroupOrDie(v1.GroupName).GroupVersion.String()},
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ObjectMeta: v1.ObjectMeta{
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UID: uuid.NewUUID(),
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Name: "foobar",
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Namespace: v1.NamespaceDefault,
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ResourceVersion: "18",
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Labels: fooBar(),
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},
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Spec: extensions.ReplicaSetSpec{
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Replicas: &size,
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Selector: newSelFooBar(),
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},
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}
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rsName, err := controller.KeyFunc(rs)
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if err != nil {
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t.Fatalf("Unexpected error naming ReplicaSet %q: %v", rs.Name, err)
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}
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return rs, rsName
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}
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func update(t *testing.T, store cache.Store, obj interface{}) {
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if err := store.Update(obj); err != nil {
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t.Fatalf("Could not add %+v to %+v: %v", obj, store, err)
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}
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}
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func add(t *testing.T, store cache.Store, obj interface{}) {
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if err := store.Add(obj); err != nil {
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t.Fatalf("Could not add %+v to %+v: %v", obj, store, err)
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}
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}
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// Create one with no selector. Verify it matches 0 pods.
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func TestNoSelector(t *testing.T) {
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dc, ps := newFakeDisruptionController()
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pdb, pdbName := newPodDisruptionBudget(t, intstr.FromInt(3))
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pdb.Spec.Selector = &metav1.LabelSelector{}
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pod, _ := newPod(t, "yo-yo-yo")
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add(t, dc.pdbLister.Store, pdb)
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dc.sync(pdbName)
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ps.VerifyPdbStatus(t, pdbName, 0, 0, 3, 0, map[string]metav1.Time{})
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add(t, dc.podLister.Indexer, pod)
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dc.sync(pdbName)
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ps.VerifyPdbStatus(t, pdbName, 0, 0, 3, 0, map[string]metav1.Time{})
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}
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// Verify that available/expected counts go up as we add pods, then verify that
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// available count goes down when we make a pod unavailable.
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func TestUnavailable(t *testing.T) {
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dc, ps := newFakeDisruptionController()
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pdb, pdbName := newPodDisruptionBudget(t, intstr.FromInt(3))
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add(t, dc.pdbLister.Store, pdb)
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dc.sync(pdbName)
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// Add three pods, verifying that the counts go up at each step.
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pods := []*v1.Pod{}
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for i := int32(0); i < 4; i++ {
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ps.VerifyPdbStatus(t, pdbName, 0, i, 3, i, map[string]metav1.Time{})
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pod, _ := newPod(t, fmt.Sprintf("yo-yo-yo %d", i))
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pods = append(pods, pod)
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add(t, dc.podLister.Indexer, pod)
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dc.sync(pdbName)
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}
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ps.VerifyPdbStatus(t, pdbName, 1, 4, 3, 4, map[string]metav1.Time{})
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// Now set one pod as unavailable
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pods[0].Status.Conditions = []v1.PodCondition{}
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update(t, dc.podLister.Indexer, pods[0])
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dc.sync(pdbName)
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// Verify expected update
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ps.VerifyPdbStatus(t, pdbName, 0, 3, 3, 4, map[string]metav1.Time{})
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}
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// Create a pod with no controller, and verify that a PDB with a percentage
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// specified won't allow a disruption.
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func TestNakedPod(t *testing.T) {
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dc, ps := newFakeDisruptionController()
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pdb, pdbName := newPodDisruptionBudget(t, intstr.FromString("28%"))
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add(t, dc.pdbLister.Store, pdb)
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dc.sync(pdbName)
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// This verifies that when a PDB has 0 pods, disruptions are not allowed.
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ps.VerifyDisruptionAllowed(t, pdbName, 0)
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pod, _ := newPod(t, "naked")
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add(t, dc.podLister.Indexer, pod)
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dc.sync(pdbName)
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ps.VerifyDisruptionAllowed(t, pdbName, 0)
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}
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// Verify that we count the scale of a ReplicaSet even when it has no Deployment.
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func TestReplicaSet(t *testing.T) {
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dc, ps := newFakeDisruptionController()
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pdb, pdbName := newPodDisruptionBudget(t, intstr.FromString("20%"))
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add(t, dc.pdbLister.Store, pdb)
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rs, _ := newReplicaSet(t, 10)
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add(t, dc.rsLister.Indexer, rs)
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pod, _ := newPod(t, "pod")
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add(t, dc.podLister.Indexer, pod)
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dc.sync(pdbName)
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ps.VerifyPdbStatus(t, pdbName, 0, 1, 2, 10, map[string]metav1.Time{})
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}
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// Verify that multiple controllers doesn't allow the PDB to be set true.
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func TestMultipleControllers(t *testing.T) {
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const rcCount = 2
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const podCount = 2
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dc, ps := newFakeDisruptionController()
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pdb, pdbName := newPodDisruptionBudget(t, intstr.FromString("1%"))
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add(t, dc.pdbLister.Store, pdb)
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for i := 0; i < podCount; i++ {
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pod, _ := newPod(t, fmt.Sprintf("pod %d", i))
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add(t, dc.podLister.Indexer, pod)
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}
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dc.sync(pdbName)
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// No controllers yet => no disruption allowed
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ps.VerifyDisruptionAllowed(t, pdbName, 0)
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rc, _ := newReplicationController(t, 1)
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rc.Name = "rc 1"
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add(t, dc.rcLister.Indexer, rc)
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dc.sync(pdbName)
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// One RC and 200%>1% healthy => disruption allowed
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ps.VerifyDisruptionAllowed(t, pdbName, 1)
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rc, _ = newReplicationController(t, 1)
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rc.Name = "rc 2"
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add(t, dc.rcLister.Indexer, rc)
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dc.sync(pdbName)
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// 100%>1% healthy BUT two RCs => no disruption allowed
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ps.VerifyDisruptionAllowed(t, pdbName, 0)
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}
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func TestReplicationController(t *testing.T) {
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// The budget in this test matches foo=bar, but the RC and its pods match
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// {foo=bar, baz=quux}. Later, when we add a rogue pod with only a foo=bar
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// label, it will match the budget but have no controllers, which should
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// trigger the controller to set PodDisruptionAllowed to false.
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labels := map[string]string{
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"foo": "bar",
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"baz": "quux",
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}
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dc, ps := newFakeDisruptionController()
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// 34% should round up to 2
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pdb, pdbName := newPodDisruptionBudget(t, intstr.FromString("34%"))
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add(t, dc.pdbLister.Store, pdb)
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rc, _ := newReplicationController(t, 3)
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rc.Spec.Selector = labels
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add(t, dc.rcLister.Indexer, rc)
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dc.sync(pdbName)
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// It starts out at 0 expected because, with no pods, the PDB doesn't know
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// about the RC. This is a known bug. TODO(mml): file issue
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ps.VerifyPdbStatus(t, pdbName, 0, 0, 0, 0, map[string]metav1.Time{})
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pods := []*v1.Pod{}
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for i := int32(0); i < 3; i++ {
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pod, _ := newPod(t, fmt.Sprintf("foobar %d", i))
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pods = append(pods, pod)
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pod.Labels = labels
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add(t, dc.podLister.Indexer, pod)
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dc.sync(pdbName)
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if i < 2 {
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ps.VerifyPdbStatus(t, pdbName, 0, i+1, 2, 3, map[string]metav1.Time{})
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} else {
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ps.VerifyPdbStatus(t, pdbName, 1, 3, 2, 3, map[string]metav1.Time{})
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}
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}
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rogue, _ := newPod(t, "rogue")
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add(t, dc.podLister.Indexer, rogue)
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dc.sync(pdbName)
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ps.VerifyDisruptionAllowed(t, pdbName, 0)
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}
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func TestTwoControllers(t *testing.T) {
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// Most of this test is in verifying intermediate cases as we define the
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// three controllers and create the pods.
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rcLabels := map[string]string{
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"foo": "bar",
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"baz": "quux",
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}
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dLabels := map[string]string{
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"foo": "bar",
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"baz": "quuux",
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}
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dc, ps := newFakeDisruptionController()
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// These constants are related, but I avoid calculating the correct values in
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// code. If you update a parameter here, recalculate the correct values for
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// all of them. Further down in the test, we use these to control loops, and
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// that level of logic is enough complexity for me.
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const collectionSize int32 = 11 // How big each collection is
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const minAvailable string = "28%" // minAvailable we'll specify
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const minimumOne int32 = 4 // integer minimum with one controller
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const minimumTwo int32 = 7 // integer minimum with two controllers
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pdb, pdbName := newPodDisruptionBudget(t, intstr.FromString("28%"))
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add(t, dc.pdbLister.Store, pdb)
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rc, _ := newReplicationController(t, collectionSize)
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rc.Spec.Selector = rcLabels
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add(t, dc.rcLister.Indexer, rc)
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dc.sync(pdbName)
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ps.VerifyPdbStatus(t, pdbName, 0, 0, 0, 0, map[string]metav1.Time{})
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pods := []*v1.Pod{}
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unavailablePods := collectionSize - minimumOne - 1
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for i := int32(1); i <= collectionSize; i++ {
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pod, _ := newPod(t, fmt.Sprintf("quux %d", i))
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pods = append(pods, pod)
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pod.Labels = rcLabels
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if i <= unavailablePods {
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pod.Status.Conditions = []v1.PodCondition{}
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}
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add(t, dc.podLister.Indexer, pod)
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dc.sync(pdbName)
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if i <= unavailablePods {
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ps.VerifyPdbStatus(t, pdbName, 0, 0, minimumOne, collectionSize, map[string]metav1.Time{})
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} else if i-unavailablePods <= minimumOne {
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ps.VerifyPdbStatus(t, pdbName, 0, i-unavailablePods, minimumOne, collectionSize, map[string]metav1.Time{})
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} else {
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ps.VerifyPdbStatus(t, pdbName, 1, i-unavailablePods, minimumOne, collectionSize, map[string]metav1.Time{})
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}
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}
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d, _ := newDeployment(t, collectionSize)
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d.Spec.Selector = newSel(dLabels)
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add(t, dc.dLister.Indexer, d)
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dc.sync(pdbName)
|
|
ps.VerifyPdbStatus(t, pdbName, 1, minimumOne+1, minimumOne, collectionSize, map[string]metav1.Time{})
|
|
|
|
rs, _ := newReplicaSet(t, collectionSize)
|
|
rs.Spec.Selector = newSel(dLabels)
|
|
rs.Labels = dLabels
|
|
add(t, dc.rsLister.Indexer, rs)
|
|
dc.sync(pdbName)
|
|
ps.VerifyPdbStatus(t, pdbName, 1, minimumOne+1, minimumOne, collectionSize, map[string]metav1.Time{})
|
|
|
|
// By the end of this loop, the number of ready pods should be N+2 (hence minimumTwo+2).
|
|
unavailablePods = 2*collectionSize - (minimumTwo + 2) - unavailablePods
|
|
for i := int32(1); i <= collectionSize; i++ {
|
|
pod, _ := newPod(t, fmt.Sprintf("quuux %d", i))
|
|
pods = append(pods, pod)
|
|
pod.Labels = dLabels
|
|
if i <= unavailablePods {
|
|
pod.Status.Conditions = []v1.PodCondition{}
|
|
}
|
|
add(t, dc.podLister.Indexer, pod)
|
|
dc.sync(pdbName)
|
|
if i <= unavailablePods {
|
|
ps.VerifyPdbStatus(t, pdbName, 0, minimumOne+1, minimumTwo, 2*collectionSize, map[string]metav1.Time{})
|
|
} else if i-unavailablePods <= minimumTwo-(minimumOne+1) {
|
|
ps.VerifyPdbStatus(t, pdbName, 0, (minimumOne+1)+(i-unavailablePods), minimumTwo, 2*collectionSize, map[string]metav1.Time{})
|
|
} else {
|
|
ps.VerifyPdbStatus(t, pdbName, i-unavailablePods-(minimumTwo-(minimumOne+1)),
|
|
(minimumOne+1)+(i-unavailablePods), minimumTwo, 2*collectionSize, map[string]metav1.Time{})
|
|
}
|
|
}
|
|
|
|
// Now we verify we can bring down 1 pod and a disruption is still permitted,
|
|
// but if we bring down two, it's not. Then we make the pod ready again and
|
|
// verify that a disruption is permitted again.
|
|
ps.VerifyPdbStatus(t, pdbName, 2, 2+minimumTwo, minimumTwo, 2*collectionSize, map[string]metav1.Time{})
|
|
pods[collectionSize-1].Status.Conditions = []v1.PodCondition{}
|
|
update(t, dc.podLister.Indexer, pods[collectionSize-1])
|
|
dc.sync(pdbName)
|
|
ps.VerifyPdbStatus(t, pdbName, 1, 1+minimumTwo, minimumTwo, 2*collectionSize, map[string]metav1.Time{})
|
|
|
|
pods[collectionSize-2].Status.Conditions = []v1.PodCondition{}
|
|
update(t, dc.podLister.Indexer, pods[collectionSize-2])
|
|
dc.sync(pdbName)
|
|
ps.VerifyPdbStatus(t, pdbName, 0, minimumTwo, minimumTwo, 2*collectionSize, map[string]metav1.Time{})
|
|
|
|
pods[collectionSize-1].Status.Conditions = []v1.PodCondition{{Type: v1.PodReady, Status: v1.ConditionTrue}}
|
|
update(t, dc.podLister.Indexer, pods[collectionSize-1])
|
|
dc.sync(pdbName)
|
|
ps.VerifyPdbStatus(t, pdbName, 1, 1+minimumTwo, minimumTwo, 2*collectionSize, map[string]metav1.Time{})
|
|
}
|
|
|
|
// Test pdb doesn't exist
|
|
func TestPDBNotExist(t *testing.T) {
|
|
dc, _ := newFakeDisruptionController()
|
|
pdb, _ := newPodDisruptionBudget(t, intstr.FromString("67%"))
|
|
add(t, dc.pdbLister.Store, pdb)
|
|
if err := dc.sync("notExist"); err != nil {
|
|
t.Errorf("Unexpected error: %v, expect nil", err)
|
|
}
|
|
}
|
|
|
|
func TestUpdateDisruptedPods(t *testing.T) {
|
|
dc, ps := newFakeDisruptionController()
|
|
dc.recheckQueue = workqueue.NewNamedDelayingQueue("pdb-queue")
|
|
pdb, pdbName := newPodDisruptionBudget(t, intstr.FromInt(1))
|
|
currentTime := time.Now()
|
|
pdb.Status.DisruptedPods = map[string]metav1.Time{
|
|
"p1": {Time: currentTime}, // Should be removed, pod deletion started.
|
|
"p2": {Time: currentTime.Add(-5 * time.Minute)}, // Should be removed, expired.
|
|
"p3": {Time: currentTime}, // Should remain, pod untouched.
|
|
"notthere": {Time: currentTime}, // Should be removed, pod deleted.
|
|
}
|
|
add(t, dc.pdbLister.Store, pdb)
|
|
|
|
pod1, _ := newPod(t, "p1")
|
|
pod1.DeletionTimestamp = &metav1.Time{Time: time.Now()}
|
|
pod2, _ := newPod(t, "p2")
|
|
pod3, _ := newPod(t, "p3")
|
|
|
|
add(t, dc.podLister.Indexer, pod1)
|
|
add(t, dc.podLister.Indexer, pod2)
|
|
add(t, dc.podLister.Indexer, pod3)
|
|
|
|
dc.sync(pdbName)
|
|
|
|
ps.VerifyPdbStatus(t, pdbName, 0, 1, 1, 3, map[string]metav1.Time{"p3": {Time: currentTime}})
|
|
}
|