479 lines
20 KiB
Go
479 lines
20 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 e2e
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import (
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"fmt"
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"strings"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/apimachinery/pkg/watch"
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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/client/cache"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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"k8s.io/kubernetes/pkg/fields"
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"k8s.io/kubernetes/test/e2e/framework"
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testutils "k8s.io/kubernetes/test/utils"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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// Blocks outgoing network traffic on 'node'. Then runs testFunc and returns its status.
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// At the end (even in case of errors), the network traffic is brought back to normal.
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// This function executes commands on a node so it will work only for some
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// environments.
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func testUnderTemporaryNetworkFailure(c clientset.Interface, ns string, node *v1.Node, testFunc func()) {
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host := framework.GetNodeExternalIP(node)
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master := framework.GetMasterAddress(c)
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By(fmt.Sprintf("block network traffic from node %s to the master", node.Name))
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defer func() {
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// This code will execute even if setting the iptables rule failed.
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// It is on purpose because we may have an error even if the new rule
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// had been inserted. (yes, we could look at the error code and ssh error
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// separately, but I prefer to stay on the safe side).
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By(fmt.Sprintf("Unblock network traffic from node %s to the master", node.Name))
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framework.UnblockNetwork(host, master)
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}()
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framework.Logf("Waiting %v to ensure node %s is ready before beginning test...", resizeNodeReadyTimeout, node.Name)
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if !framework.WaitForNodeToBe(c, node.Name, v1.NodeReady, true, resizeNodeReadyTimeout) {
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framework.Failf("Node %s did not become ready within %v", node.Name, resizeNodeReadyTimeout)
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}
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framework.BlockNetwork(host, master)
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framework.Logf("Waiting %v for node %s to be not ready after simulated network failure", resizeNodeNotReadyTimeout, node.Name)
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if !framework.WaitForNodeToBe(c, node.Name, v1.NodeReady, false, resizeNodeNotReadyTimeout) {
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framework.Failf("Node %s did not become not-ready within %v", node.Name, resizeNodeNotReadyTimeout)
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}
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testFunc()
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// network traffic is unblocked in a deferred function
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}
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func expectNodeReadiness(isReady bool, newNode chan *v1.Node) {
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timeout := false
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expected := false
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timer := time.After(nodeReadinessTimeout)
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for !expected && !timeout {
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select {
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case n := <-newNode:
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if framework.IsNodeConditionSetAsExpected(n, v1.NodeReady, isReady) {
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expected = true
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} else {
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framework.Logf("Observed node ready status is NOT %v as expected", isReady)
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}
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case <-timer:
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timeout = true
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}
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}
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if !expected {
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framework.Failf("Failed to observe node ready status change to %v", isReady)
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}
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}
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func podOnNode(podName, nodeName string, image string) *v1.Pod {
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return &v1.Pod{
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ObjectMeta: v1.ObjectMeta{
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Name: podName,
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Labels: map[string]string{
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"name": podName,
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},
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},
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: podName,
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Image: image,
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Ports: []v1.ContainerPort{{ContainerPort: 9376}},
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},
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},
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NodeName: nodeName,
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RestartPolicy: v1.RestartPolicyNever,
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},
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}
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}
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func newPodOnNode(c clientset.Interface, namespace, podName, nodeName string) error {
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pod, err := c.Core().Pods(namespace).Create(podOnNode(podName, nodeName, serveHostnameImage))
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if err == nil {
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framework.Logf("Created pod %s on node %s", pod.ObjectMeta.Name, nodeName)
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} else {
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framework.Logf("Failed to create pod %s on node %s: %v", podName, nodeName, err)
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}
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return err
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}
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var _ = framework.KubeDescribe("Network Partition [Disruptive] [Slow]", func() {
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f := framework.NewDefaultFramework("network-partition")
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var systemPodsNo int32
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var c clientset.Interface
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var ns string
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ignoreLabels := framework.ImagePullerLabels
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var group string
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BeforeEach(func() {
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c = f.ClientSet
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ns = f.Namespace.Name
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systemPods, err := framework.GetPodsInNamespace(c, ns, ignoreLabels)
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Expect(err).NotTo(HaveOccurred())
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systemPodsNo = int32(len(systemPods))
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if strings.Index(framework.TestContext.CloudConfig.NodeInstanceGroup, ",") >= 0 {
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framework.Failf("Test dose not support cluster setup with more than one MIG: %s", framework.TestContext.CloudConfig.NodeInstanceGroup)
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} else {
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group = framework.TestContext.CloudConfig.NodeInstanceGroup
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}
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})
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framework.KubeDescribe("Pods", func() {
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Context("should return to running and ready state after network partition is healed", func() {
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BeforeEach(func() {
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framework.SkipUnlessProviderIs("gce", "gke", "aws")
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framework.SkipUnlessNodeCountIsAtLeast(2)
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})
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// What happens in this test:
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// Network traffic from a node to master is cut off to simulate network partition
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// Expect to observe:
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// 1. Node is marked NotReady after timeout by nodecontroller (40seconds)
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// 2. All pods on node are marked NotReady shortly after #1
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// 3. Node and pods return to Ready after connectivivty recovers
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It("All pods on the unreachable node should be marked as NotReady upon the node turn NotReady "+
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"AND all pods should be mark back to Ready when the node get back to Ready before pod eviction timeout", func() {
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By("choose a node - we will block all network traffic on this node")
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var podOpts v1.ListOptions
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nodeOpts := v1.ListOptions{}
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nodes, err := c.Core().Nodes().List(nodeOpts)
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Expect(err).NotTo(HaveOccurred())
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framework.FilterNodes(nodes, func(node v1.Node) bool {
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if !framework.IsNodeConditionSetAsExpected(&node, v1.NodeReady, true) {
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return false
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}
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podOpts = v1.ListOptions{FieldSelector: fields.OneTermEqualSelector(api.PodHostField, node.Name).String()}
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pods, err := c.Core().Pods(v1.NamespaceAll).List(podOpts)
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if err != nil || len(pods.Items) <= 0 {
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return false
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}
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return true
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})
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if len(nodes.Items) <= 0 {
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framework.Failf("No eligible node were found: %d", len(nodes.Items))
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}
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node := nodes.Items[0]
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podOpts = v1.ListOptions{FieldSelector: fields.OneTermEqualSelector(api.PodHostField, node.Name).String()}
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if err = framework.WaitForMatchPodsCondition(c, podOpts, "Running and Ready", podReadyTimeout, testutils.PodRunningReady); err != nil {
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framework.Failf("Pods on node %s are not ready and running within %v: %v", node.Name, podReadyTimeout, err)
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}
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By("Set up watch on node status")
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nodeSelector := fields.OneTermEqualSelector("metadata.name", node.Name)
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stopCh := make(chan struct{})
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newNode := make(chan *v1.Node)
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var controller cache.Controller
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_, controller = cache.NewInformer(
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&cache.ListWatch{
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ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
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options.FieldSelector = nodeSelector.String()
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obj, err := f.ClientSet.Core().Nodes().List(options)
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return runtime.Object(obj), err
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},
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WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
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options.FieldSelector = nodeSelector.String()
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return f.ClientSet.Core().Nodes().Watch(options)
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},
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},
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&v1.Node{},
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0,
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cache.ResourceEventHandlerFuncs{
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UpdateFunc: func(oldObj, newObj interface{}) {
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n, ok := newObj.(*v1.Node)
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Expect(ok).To(Equal(true))
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newNode <- n
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},
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},
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)
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defer func() {
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// Will not explicitly close newNode channel here due to
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// race condition where stopCh and newNode are closed but informer onUpdate still executes.
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close(stopCh)
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}()
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go controller.Run(stopCh)
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By(fmt.Sprintf("Block traffic from node %s to the master", node.Name))
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host := framework.GetNodeExternalIP(&node)
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master := framework.GetMasterAddress(c)
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defer func() {
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By(fmt.Sprintf("Unblock traffic from node %s to the master", node.Name))
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framework.UnblockNetwork(host, master)
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if CurrentGinkgoTestDescription().Failed {
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return
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}
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By("Expect to observe node and pod status change from NotReady to Ready after network connectivity recovers")
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expectNodeReadiness(true, newNode)
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if err = framework.WaitForMatchPodsCondition(c, podOpts, "Running and Ready", podReadyTimeout, testutils.PodRunningReady); err != nil {
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framework.Failf("Pods on node %s did not become ready and running within %v: %v", node.Name, podReadyTimeout, err)
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}
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}()
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framework.BlockNetwork(host, master)
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By("Expect to observe node and pod status change from Ready to NotReady after network partition")
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expectNodeReadiness(false, newNode)
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if err = framework.WaitForMatchPodsCondition(c, podOpts, "NotReady", podNotReadyTimeout, testutils.PodNotReady); err != nil {
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framework.Failf("Pods on node %s did not become NotReady within %v: %v", node.Name, podNotReadyTimeout, err)
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}
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})
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})
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})
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framework.KubeDescribe("[ReplicationController]", func() {
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It("should recreate pods scheduled on the unreachable node "+
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"AND allow scheduling of pods on a node after it rejoins the cluster", func() {
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// Create a replication controller for a service that serves its hostname.
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// The source for the Docker container kubernetes/serve_hostname is in contrib/for-demos/serve_hostname
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name := "my-hostname-net"
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newSVCByName(c, ns, name)
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replicas := int32(framework.TestContext.CloudConfig.NumNodes)
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newRCByName(c, ns, name, replicas, nil)
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err := framework.VerifyPods(c, ns, name, true, replicas)
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Expect(err).NotTo(HaveOccurred(), "Each pod should start running and responding")
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By("choose a node with at least one pod - we will block some network traffic on this node")
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label := labels.SelectorFromSet(labels.Set(map[string]string{"name": name}))
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options := v1.ListOptions{LabelSelector: label.String()}
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pods, err := c.Core().Pods(ns).List(options) // list pods after all have been scheduled
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Expect(err).NotTo(HaveOccurred())
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nodeName := pods.Items[0].Spec.NodeName
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node, err := c.Core().Nodes().Get(nodeName, metav1.GetOptions{})
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Expect(err).NotTo(HaveOccurred())
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// This creates a temporary network partition, verifies that 'podNameToDisappear',
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// that belongs to replication controller 'rcName', really disappeared (because its
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// grace period is set to 0).
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// Finally, it checks that the replication controller recreates the
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// pods on another node and that now the number of replicas is equal 'replicas'.
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By(fmt.Sprintf("blocking network traffic from node %s", node.Name))
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testUnderTemporaryNetworkFailure(c, ns, node, func() {
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framework.Logf("Waiting for pod %s to be removed", pods.Items[0].Name)
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err := framework.WaitForRCPodToDisappear(c, ns, name, pods.Items[0].Name)
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Expect(err).NotTo(HaveOccurred())
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By("verifying whether the pod from the unreachable node is recreated")
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err = framework.VerifyPods(c, ns, name, true, replicas)
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Expect(err).NotTo(HaveOccurred())
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})
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framework.Logf("Waiting %v for node %s to be ready once temporary network failure ends", resizeNodeReadyTimeout, node.Name)
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if !framework.WaitForNodeToBeReady(c, node.Name, resizeNodeReadyTimeout) {
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framework.Failf("Node %s did not become ready within %v", node.Name, resizeNodeReadyTimeout)
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}
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// sleep a bit, to allow Watch in NodeController to catch up.
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time.Sleep(5 * time.Second)
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By("verify whether new pods can be created on the re-attached node")
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// increasing the RC size is not a valid way to test this
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// since we have no guarantees the pod will be scheduled on our node.
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additionalPod := "additionalpod"
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err = newPodOnNode(c, ns, additionalPod, node.Name)
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Expect(err).NotTo(HaveOccurred())
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err = framework.VerifyPods(c, ns, additionalPod, true, 1)
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Expect(err).NotTo(HaveOccurred())
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// verify that it is really on the requested node
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{
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pod, err := c.Core().Pods(ns).Get(additionalPod, metav1.GetOptions{})
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Expect(err).NotTo(HaveOccurred())
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if pod.Spec.NodeName != node.Name {
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framework.Logf("Pod %s found on invalid node: %s instead of %s", pod.Name, pod.Spec.NodeName, node.Name)
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}
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}
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})
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It("should eagerly create replacement pod during network partition when termination grace is non-zero", func() {
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// Create a replication controller for a service that serves its hostname.
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// The source for the Docker container kubernetes/serve_hostname is in contrib/for-demos/serve_hostname
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name := "my-hostname-net"
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gracePeriod := int64(30)
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newSVCByName(c, ns, name)
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replicas := int32(framework.TestContext.CloudConfig.NumNodes)
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newRCByName(c, ns, name, replicas, &gracePeriod)
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err := framework.VerifyPods(c, ns, name, true, replicas)
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Expect(err).NotTo(HaveOccurred(), "Each pod should start running and responding")
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By("choose a node with at least one pod - we will block some network traffic on this node")
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label := labels.SelectorFromSet(labels.Set(map[string]string{"name": name}))
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options := v1.ListOptions{LabelSelector: label.String()}
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pods, err := c.Core().Pods(ns).List(options) // list pods after all have been scheduled
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Expect(err).NotTo(HaveOccurred())
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nodeName := pods.Items[0].Spec.NodeName
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node, err := c.Core().Nodes().Get(nodeName, metav1.GetOptions{})
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Expect(err).NotTo(HaveOccurred())
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// This creates a temporary network partition, verifies that 'podNameToDisappear',
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// that belongs to replication controller 'rcName', did not disappear (because its
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// grace period is set to 30).
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// Finally, it checks that the replication controller recreates the
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// pods on another node and that now the number of replicas is equal 'replicas + 1'.
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By(fmt.Sprintf("blocking network traffic from node %s", node.Name))
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testUnderTemporaryNetworkFailure(c, ns, node, func() {
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framework.Logf("Waiting for pod %s to be removed", pods.Items[0].Name)
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err := framework.WaitForRCPodToDisappear(c, ns, name, pods.Items[0].Name)
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Expect(err).To(Equal(wait.ErrWaitTimeout), "Pod was not deleted during network partition.")
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By(fmt.Sprintf("verifying that there are %v running pods during partition", replicas))
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_, err = framework.PodsCreated(c, ns, name, replicas)
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Expect(err).NotTo(HaveOccurred())
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})
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framework.Logf("Waiting %v for node %s to be ready once temporary network failure ends", resizeNodeReadyTimeout, node.Name)
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if !framework.WaitForNodeToBeReady(c, node.Name, resizeNodeReadyTimeout) {
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framework.Failf("Node %s did not become ready within %v", node.Name, resizeNodeReadyTimeout)
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}
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})
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})
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framework.KubeDescribe("[StatefulSet]", func() {
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psName := "ss"
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labels := map[string]string{
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"foo": "bar",
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}
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headlessSvcName := "test"
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BeforeEach(func() {
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framework.SkipUnlessProviderIs("gce", "gke")
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By("creating service " + headlessSvcName + " in namespace " + f.Namespace.Name)
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headlessService := createServiceSpec(headlessSvcName, "", true, labels)
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_, err := f.ClientSet.Core().Services(f.Namespace.Name).Create(headlessService)
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framework.ExpectNoError(err)
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c = f.ClientSet
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ns = f.Namespace.Name
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})
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AfterEach(func() {
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if CurrentGinkgoTestDescription().Failed {
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dumpDebugInfo(c, ns)
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}
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framework.Logf("Deleting all stateful set in ns %v", ns)
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deleteAllStatefulSets(c, ns)
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})
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It("should come back up if node goes down [Slow] [Disruptive]", func() {
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petMounts := []v1.VolumeMount{{Name: "datadir", MountPath: "/data/"}}
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podMounts := []v1.VolumeMount{{Name: "home", MountPath: "/home"}}
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ps := newStatefulSet(psName, ns, headlessSvcName, 3, petMounts, podMounts, labels)
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_, err := c.Apps().StatefulSets(ns).Create(ps)
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Expect(err).NotTo(HaveOccurred())
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pst := statefulSetTester{c: c}
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nn := framework.TestContext.CloudConfig.NumNodes
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nodeNames, err := framework.CheckNodesReady(f.ClientSet, framework.NodeReadyInitialTimeout, nn)
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framework.ExpectNoError(err)
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restartNodes(f, nodeNames)
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By("waiting for pods to be running again")
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pst.waitForRunningAndReady(*ps.Spec.Replicas, ps)
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})
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It("should not reschedule stateful pods if there is a network partition [Slow] [Disruptive]", func() {
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ps := newStatefulSet(psName, ns, headlessSvcName, 3, []v1.VolumeMount{}, []v1.VolumeMount{}, labels)
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_, err := c.Apps().StatefulSets(ns).Create(ps)
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Expect(err).NotTo(HaveOccurred())
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pst := statefulSetTester{c: c}
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pst.waitForRunningAndReady(*ps.Spec.Replicas, ps)
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pod := pst.getPodList(ps).Items[0]
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node, err := c.Core().Nodes().Get(pod.Spec.NodeName, metav1.GetOptions{})
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framework.ExpectNoError(err)
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// Blocks outgoing network traffic on 'node'. Then verifies that 'podNameToDisappear',
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// that belongs to StatefulSet 'statefulSetName', **does not** disappear due to forced deletion from the apiserver.
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// The grace period on the stateful pods is set to a value > 0.
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testUnderTemporaryNetworkFailure(c, ns, node, func() {
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framework.Logf("Checking that the NodeController does not force delete stateful pods %v", pod.Name)
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err := framework.WaitTimeoutForPodNoLongerRunningInNamespace(c, pod.Name, ns, pod.ResourceVersion, 10*time.Minute)
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Expect(err).To(Equal(wait.ErrWaitTimeout), "Pod was not deleted during network partition.")
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})
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framework.Logf("Waiting %v for node %s to be ready once temporary network failure ends", resizeNodeReadyTimeout, node.Name)
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if !framework.WaitForNodeToBeReady(c, node.Name, resizeNodeReadyTimeout) {
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framework.Failf("Node %s did not become ready within %v", node.Name, resizeNodeReadyTimeout)
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}
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By("waiting for pods to be running again")
|
|
pst.waitForRunningAndReady(*ps.Spec.Replicas, ps)
|
|
})
|
|
})
|
|
|
|
framework.KubeDescribe("[Job]", func() {
|
|
It("should create new pods when node is partitioned", func() {
|
|
parallelism := int32(2)
|
|
completions := int32(4)
|
|
|
|
job := newTestJob("notTerminate", "network-partition", v1.RestartPolicyNever, parallelism, completions)
|
|
job, err := createJob(f.ClientSet, f.Namespace.Name, job)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
label := labels.SelectorFromSet(labels.Set(map[string]string{jobSelectorKey: job.Name}))
|
|
|
|
By(fmt.Sprintf("verifying that there are now %v running pods", parallelism))
|
|
_, err = framework.PodsCreatedByLabel(c, ns, job.Name, parallelism, label)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
|
|
By("choose a node with at least one pod - we will block some network traffic on this node")
|
|
options := v1.ListOptions{LabelSelector: label.String()}
|
|
pods, err := c.Core().Pods(ns).List(options) // list pods after all have been scheduled
|
|
Expect(err).NotTo(HaveOccurred())
|
|
nodeName := pods.Items[0].Spec.NodeName
|
|
|
|
node, err := c.Core().Nodes().Get(nodeName, metav1.GetOptions{})
|
|
Expect(err).NotTo(HaveOccurred())
|
|
|
|
// This creates a temporary network partition, verifies that the job has 'parallelism' number of
|
|
// running pods after the node-controller detects node unreachable.
|
|
By(fmt.Sprintf("blocking network traffic from node %s", node.Name))
|
|
testUnderTemporaryNetworkFailure(c, ns, node, func() {
|
|
framework.Logf("Waiting for pod %s to be removed", pods.Items[0].Name)
|
|
err := framework.WaitForPodToDisappear(c, ns, pods.Items[0].Name, label, 20*time.Second, 10*time.Minute)
|
|
Expect(err).To(Equal(wait.ErrWaitTimeout), "Pod was not deleted during network partition.")
|
|
|
|
By(fmt.Sprintf("verifying that there are now %v running pods", parallelism))
|
|
_, err = framework.PodsCreatedByLabel(c, ns, job.Name, parallelism, label)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
})
|
|
|
|
framework.Logf("Waiting %v for node %s to be ready once temporary network failure ends", resizeNodeReadyTimeout, node.Name)
|
|
if !framework.WaitForNodeToBeReady(c, node.Name, resizeNodeReadyTimeout) {
|
|
framework.Failf("Node %s did not become ready within %v", node.Name, resizeNodeReadyTimeout)
|
|
}
|
|
})
|
|
})
|
|
})
|