258 lines
9 KiB
Go
258 lines
9 KiB
Go
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/*
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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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// This test references
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// persistent_volumes.go
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// volumes.go
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package e2e
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import (
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"fmt"
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"time"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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"k8s.io/kubernetes/test/e2e/framework"
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)
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type testBody func(c clientset.Interface, f *framework.Framework, clientPod *v1.Pod, pvc *v1.PersistentVolumeClaim, pv *v1.PersistentVolume)
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type disruptiveTest struct {
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testItStmt string
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runTest testBody
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}
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type kubeletOpt string
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const (
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MinNodes = 2
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NodeStateTimeout = 1 * time.Minute
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kStart kubeletOpt = "start"
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kStop kubeletOpt = "stop"
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kRestart kubeletOpt = "restart"
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)
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var _ = framework.KubeDescribe("PersistentVolumes [Disruptive]", func() {
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f := framework.NewDefaultFramework("disruptive-pv")
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var (
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c clientset.Interface
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ns string
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nfsServerPod *v1.Pod
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nfsPVconfig persistentVolumeConfig
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nfsServerIP, clientNodeIP string
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clientNode *v1.Node
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)
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nfsServerConfig := VolumeTestConfig{
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namespace: v1.NamespaceDefault,
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prefix: "nfs",
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serverImage: NfsServerImage,
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serverPorts: []int{2049},
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serverArgs: []string{"-G", "777", "/exports"},
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}
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BeforeEach(func() {
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// To protect the NFS volume pod from the kubelet restart, we isolate it on its own node.
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framework.SkipUnlessNodeCountIsAtLeast(MinNodes)
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c = f.ClientSet
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ns = f.Namespace.Name
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// Start the NFS server pod.
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if nfsServerPod == nil {
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framework.Logf("[BeforeEach] Initializing NFS Server Pod")
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nfsServerPod = startVolumeServer(c, nfsServerConfig)
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framework.Logf("[BeforeEach] Configuring PersistentVolume")
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nfsServerIP = nfsServerPod.Status.PodIP
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Expect(nfsServerIP).NotTo(BeEmpty())
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nfsPVconfig = persistentVolumeConfig{
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namePrefix: "nfs-",
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pvSource: v1.PersistentVolumeSource{
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NFS: &v1.NFSVolumeSource{
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Server: nfsServerIP,
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Path: "/exports",
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ReadOnly: false,
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},
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},
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}
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}
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// Get the first ready node IP that is not hosting the NFS pod.
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if clientNodeIP == "" {
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framework.Logf("Designating test node")
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nodes := framework.GetReadySchedulableNodesOrDie(c)
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for _, node := range nodes.Items {
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if node.Name != nfsServerPod.Spec.NodeName {
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clientNode = &node
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clientNodeIP = framework.GetNodeExternalIP(clientNode)
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Expect(clientNodeIP).NotTo(BeEmpty())
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break
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}
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}
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}
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})
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AddCleanupAction(func() {
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if nfsServerPod != nil && c != nil {
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By("Deleting NFS server pod")
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nfsServerPodCleanup(c, nfsServerConfig)
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nfsServerPod = nil
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}
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})
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Context("when kubelet restarts", func() {
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var (
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clientPod *v1.Pod
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pv *v1.PersistentVolume
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pvc *v1.PersistentVolumeClaim
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)
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BeforeEach(func() {
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framework.Logf("Initializing test spec")
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clientPod, pv, pvc = initTestCase(f, c, nfsPVconfig, ns, clientNode.Name)
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})
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AfterEach(func() {
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framework.Logf("Tearing down test spec")
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tearDownTestCase(c, f, ns, clientPod, pvc, pv)
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pv, pvc, clientPod = nil, nil, nil
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})
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// Test table housing the It() title string and test spec. runTest is type testBody, defined at
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// the start of this file. To add tests, define a function mirroring the testBody signature and assign
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// to runTest.
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disruptiveTestTable := []disruptiveTest{
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{
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testItStmt: "Should test that a file written to the mount before kubelet restart is stat-able after restart.",
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runTest: testKubeletRestartsAndRestoresMount,
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},
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{
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testItStmt: "Should test that a volume mounted to a pod that is deleted while the kubelet is down unmounts when the kubelet returns.",
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runTest: testVolumeUnmountsFromDeletedPod,
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},
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}
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// Test loop executes each disruptiveTest iteratively.
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for _, test := range disruptiveTestTable {
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func(t disruptiveTest) {
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It(t.testItStmt, func() {
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By("Executing Spec")
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t.runTest(c, f, clientPod, pvc, pv)
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})
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}(test)
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}
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})
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})
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// testKubeletRestartsAndRestoresMount tests that a volume mounted to a pod remains mounted after a kubelet restarts
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func testKubeletRestartsAndRestoresMount(c clientset.Interface, f *framework.Framework, clientPod *v1.Pod, pvc *v1.PersistentVolumeClaim, pv *v1.PersistentVolume) {
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By("Writing to the volume.")
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file := "/mnt/_SUCCESS"
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_, err := podExec(clientPod, "touch "+file)
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Expect(err).NotTo(HaveOccurred())
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By("Restarting kubelet")
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kubeletCommand(kRestart, c, clientPod)
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By("Testing that written file is accessible.")
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_, err = podExec(clientPod, "cat "+file)
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Expect(err).NotTo(HaveOccurred())
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framework.Logf("Pod %s detected %s after kubelet restart", clientPod.Name, file)
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}
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// testVolumeUnmountsFromDeletedPod tests that a volume unmounts if the client pod was deleted while the kubelet was down.
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func testVolumeUnmountsFromDeletedPod(c clientset.Interface, f *framework.Framework, clientPod *v1.Pod, pvc *v1.PersistentVolumeClaim, pv *v1.PersistentVolume) {
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nodeIP, err := framework.GetHostExternalAddress(c, clientPod)
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Expect(err).NotTo(HaveOccurred())
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nodeIP = nodeIP + ":22"
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By("Expecting the volume mount to be found.")
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result, err := framework.SSH("mount | grep "+string(clientPod.UID), nodeIP, framework.TestContext.Provider)
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Expect(err).NotTo(HaveOccurred())
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Expect(result.Code).To(BeZero())
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By("Restarting the kubelet.")
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kubeletCommand(kStop, c, clientPod)
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deletePod(f, c, clientPod.Namespace, clientPod)
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kubeletCommand(kStart, c, clientPod)
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By("Expecting the volume mount not to be found.")
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result, err = framework.SSH("mount| grep "+string(clientPod.UID), nodeIP, framework.TestContext.Provider)
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Expect(err).NotTo(HaveOccurred())
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Expect(result.Code).NotTo(BeZero())
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framework.Logf("Volume mount detected on pod and written file is readable post-restart.")
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}
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// initTestCase initializes spec resources (pv, pvc, and pod) and returns pointers to be consumed by the test
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func initTestCase(f *framework.Framework, c clientset.Interface, pvConfig persistentVolumeConfig, ns, nodeName string) (*v1.Pod, *v1.PersistentVolume, *v1.PersistentVolumeClaim) {
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pv, pvc := createPVPVC(c, pvConfig, ns, false)
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pod := makePod(ns, pvc.Name)
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pod.Spec.NodeName = nodeName
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framework.Logf("Creating nfs client Pod %s on node %s", pod.Name, nodeName)
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pod, err := c.Core().Pods(ns).Create(pod)
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Expect(err).NotTo(HaveOccurred())
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err = framework.WaitForPodRunningInNamespace(c, pod)
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Expect(err).NotTo(HaveOccurred())
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pod, err = c.Core().Pods(ns).Get(pod.Name, metav1.GetOptions{})
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Expect(err).NotTo(HaveOccurred())
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pvc, err = c.Core().PersistentVolumeClaims(ns).Get(pvc.Name, metav1.GetOptions{})
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Expect(err).NotTo(HaveOccurred())
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pv, err = c.Core().PersistentVolumes().Get(pv.Name, metav1.GetOptions{})
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Expect(err).NotTo(HaveOccurred())
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return pod, pv, pvc
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}
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// tearDownTestCase destroy resources created by initTestCase.
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func tearDownTestCase(c clientset.Interface, f *framework.Framework, ns string, pod *v1.Pod, pvc *v1.PersistentVolumeClaim, pv *v1.PersistentVolume) {
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deletePod(f, c, ns, pod)
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deletePersistentVolumeClaim(c, pvc.Name, ns)
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deletePersistentVolume(c, pv.Name)
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}
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// kubeletCommand performs `start`, `restart`, or `stop` on the kubelet running on the node of the target pod.
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// Allowed kubeltOps are `kStart`, `kStop`, and `kRestart`
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func kubeletCommand(kOp kubeletOpt, c clientset.Interface, pod *v1.Pod) {
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nodeIP, err := framework.GetHostExternalAddress(c, pod)
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Expect(err).NotTo(HaveOccurred())
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nodeIP = nodeIP + ":22"
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sshResult, err := framework.SSH("sudo /etc/init.d/kubelet "+string(kOp), nodeIP, framework.TestContext.Provider)
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Expect(err).NotTo(HaveOccurred())
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framework.LogSSHResult(sshResult)
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// On restart, waiting for node NotReady prevents a race condition where the node takes a few moments to leave the
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// Ready state which in turn short circuits WaitForNodeToBeReady()
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if kOp == kStop || kOp == kRestart {
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if ok := framework.WaitForNodeToBeNotReady(c, pod.Spec.NodeName, NodeStateTimeout); !ok {
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framework.Failf("Node %s failed to enter NotReady state", pod.Spec.NodeName)
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}
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}
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if kOp == kStart || kOp == kRestart {
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if ok := framework.WaitForNodeToBeReady(c, pod.Spec.NodeName, NodeStateTimeout); !ok {
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framework.Failf("Node %s failed to enter Ready state", pod.Spec.NodeName)
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}
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}
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}
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// podExec wraps RunKubectl to execute a bash cmd in target pod
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func podExec(pod *v1.Pod, bashExec string) (string, error) {
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return framework.RunKubectl("exec", fmt.Sprintf("--namespace=%s", pod.Namespace), pod.Name, "--", "/bin/sh", "-c", bashExec)
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}
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