Refactor disruption e2e test and add some eviction test cases.

test/e2e/disruption.go

@@ -23,14 +23,24 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 	release_1_4 "k8s.io/client-go/1.4/kubernetes"
+	apiapi "k8s.io/client-go/1.4/pkg/api"
 	"k8s.io/client-go/1.4/pkg/api/unversioned"
 	api "k8s.io/client-go/1.4/pkg/api/v1"
+	extensions "k8s.io/client-go/1.4/pkg/apis/extensions/v1beta1"
 	policy "k8s.io/client-go/1.4/pkg/apis/policy/v1alpha1"
 	"k8s.io/client-go/1.4/pkg/util/intstr"
 	"k8s.io/kubernetes/pkg/util/wait"
 	"k8s.io/kubernetes/test/e2e/framework"
 )
 
+// timeout is used for most polling/waiting activities
+const timeout = 60 * time.Second
+
+// schedulingTimeout is longer specifically because sometimes we need to wait
+// awhile to guarantee that we've been patient waiting for something ordinary
+// to happen: a pod to get scheduled and move into Ready
+const schedulingTimeout = 5 * time.Minute
+
 var _ = framework.KubeDescribe("DisruptionController", func() {
 	f := framework.NewDefaultFramework("disruption")
 	var ns string
@@ -55,7 +65,7 @@ var _ = framework.KubeDescribe("DisruptionController", func() {
 
 		// Since disruptionAllowed starts out false, if we see it ever become true,
 		// that means the controller is working.
-		err := wait.PollImmediate(framework.Poll, 60*time.Second, func() (bool, error) {
+		err := wait.PollImmediate(framework.Poll, timeout, func() (bool, error) {
 			pdb, err := cs.Policy().PodDisruptionBudgets(ns).Get("foo")
 			if err != nil {
 				return false, err
@@ -66,29 +76,75 @@ var _ = framework.KubeDescribe("DisruptionController", func() {
 
 	})
 
-	It("should allow an eviction when there is no PDB", func() {
-		createPodsOrDie(cs, ns, 1)
-
-		pod, err := cs.Pods(ns).Get("pod-0")
-		Expect(err).NotTo(HaveOccurred())
-
-		e := &policy.Eviction{
-			ObjectMeta: api.ObjectMeta{
-				Name:      pod.Name,
-				Namespace: ns,
+	evictionCases := []struct {
+		description    string
+		minAvailable   intstr.IntOrString
+		podCount       int
+		replicaSetSize int32
+		shouldDeny     bool
+		exclusive      bool
+	}{
+		{
+			description:  "no PDB",
+			minAvailable: intstr.FromString(""),
+			podCount:     1,
+			shouldDeny:   false,
+		}, {
+			description:  "too few pods, absolute",
+			minAvailable: intstr.FromInt(2),
+			podCount:     1,
+			shouldDeny:   true,
+		}, {
+			description:  "enough pods, absolute",
+			minAvailable: intstr.FromInt(2),
+			podCount:     2,
+			shouldDeny:   false,
+		}, {
+			description:    "enough pods, replicaSet, percentage",
+			minAvailable:   intstr.FromString("100%"),
+			replicaSetSize: 10,
+			exclusive:      false,
+			shouldDeny:     false,
+		}, {
+			description:    "too few pods, replicaSet, percentage",
+			minAvailable:   intstr.FromString("100%"),
+			replicaSetSize: 10,
+			exclusive:      true,
+			shouldDeny:     true,
 		},
 	}
+	for _, c := range evictionCases {
+		expectation := "should allow an eviction"
+		if c.shouldDeny {
+			expectation = "should not allow an eviction"
+		}
+		It(fmt.Sprintf("evictions: %s => %s", c.description, expectation), func() {
+			createPodsOrDie(cs, ns, c.podCount)
+			if c.replicaSetSize > 0 {
+				createReplicaSetOrDie(cs, ns, c.replicaSetSize, c.exclusive)
+			}
 
-		err = cs.Pods(ns).Evict(e)
-		Expect(err).NotTo(HaveOccurred())
+			if c.minAvailable.String() != "" {
+				createPodDisruptionBudgetOrDie(cs, ns, c.minAvailable)
+			}
+
+			// Locate a running pod.
+			var pod api.Pod
+			err := wait.PollImmediate(framework.Poll, schedulingTimeout, func() (bool, error) {
+				podList, err := cs.Pods(ns).List(apiapi.ListOptions{})
+				if err != nil {
+					return false, err
+				}
+
+				for i := range podList.Items {
+					if podList.Items[i].Status.Phase == api.PodRunning {
+						pod = podList.Items[i]
+						return true, nil
+					}
+				}
+
+				return false, nil
 			})
-
-	It("should not allow an eviction when too few pods", func() {
-		createPodDisruptionBudgetOrDie(cs, ns, intstr.FromInt(2))
-
-		createPodsOrDie(cs, ns, 1)
-
-		pod, err := cs.Pods(ns).Get("pod-0")
 			Expect(err).NotTo(HaveOccurred())
 
 			e := &policy.Eviction{
@@ -98,32 +154,17 @@ var _ = framework.KubeDescribe("DisruptionController", func() {
 				},
 			}
 
+			if c.shouldDeny {
 				// Since disruptionAllowed starts out false, wait at least 60s hoping that
 				// this gives the controller enough time to have truly set the status.
-		time.Sleep(60 * time.Second)
+				time.Sleep(timeout)
 
 				err = cs.Pods(ns).Evict(e)
 				Expect(err).Should(MatchError("Cannot evict pod as it would violate the pod's disruption budget."))
-	})
-
-	It("should allow an eviction when enough pods", func() {
-		createPodDisruptionBudgetOrDie(cs, ns, intstr.FromInt(2))
-
-		createPodsOrDie(cs, ns, 2)
-
-		pod, err := cs.Pods(ns).Get("pod-0")
-		Expect(err).NotTo(HaveOccurred())
-
-		e := &policy.Eviction{
-			ObjectMeta: api.ObjectMeta{
-				Name:      pod.Name,
-				Namespace: ns,
-			},
-		}
-
+			} else {
 				// Since disruptionAllowed starts out false, if an eviction is ever allowed,
 				// that means the controller is working.
-		err = wait.PollImmediate(framework.Poll, 60*time.Second, func() (bool, error) {
+				err = wait.PollImmediate(framework.Poll, timeout, func() (bool, error) {
 					err = cs.Pods(ns).Evict(e)
 					if err != nil {
 						return false, nil
@@ -132,7 +173,10 @@ var _ = framework.KubeDescribe("DisruptionController", func() {
 					}
 				})
 				Expect(err).NotTo(HaveOccurred())
+			}
 		})
+	}
+
 })
 
 func createPodDisruptionBudgetOrDie(cs *release_1_4.Clientset, ns string, minAvailable intstr.IntOrString) {
@@ -173,3 +217,39 @@ func createPodsOrDie(cs *release_1_4.Clientset, ns string, n int) {
 		framework.ExpectNoError(err, "Creating pod %q in namespace %q", pod.Name, ns)
 	}
 }
+
+func createReplicaSetOrDie(cs *release_1_4.Clientset, ns string, size int32, exclusive bool) {
+	container := api.Container{
+		Name:  "busybox",
+		Image: "gcr.io/google_containers/echoserver:1.4",
+	}
+	if exclusive {
+		container.Ports = []api.ContainerPort{
+			{HostPort: 5555, ContainerPort: 5555},
+		}
+	}
+
+	rs := &extensions.ReplicaSet{
+		ObjectMeta: api.ObjectMeta{
+			Name:      "rs",
+			Namespace: ns,
+		},
+		Spec: extensions.ReplicaSetSpec{
+			Replicas: &size,
+			Selector: &extensions.LabelSelector{
+				MatchLabels: map[string]string{"foo": "bar"},
+			},
+			Template: api.PodTemplateSpec{
+				ObjectMeta: api.ObjectMeta{
+					Labels: map[string]string{"foo": "bar"},
+				},
+				Spec: api.PodSpec{
+					Containers: []api.Container{container},
+				},
+			},
+		},
+	}
+
+	_, err := cs.Extensions().ReplicaSets(ns).Create(rs)
+	framework.ExpectNoError(err, "Creating replica set %q in namespace %q", rs.Name, ns)
+}