/
snapshottable.go
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/
snapshottable.go
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/*
Copyright 2018 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package testsuites
import (
"context"
"fmt"
"strings"
"time"
"github.com/onsi/ginkgo"
"github.com/onsi/gomega"
v1 "k8s.io/api/core/v1"
storagev1 "k8s.io/api/storage/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/client-go/dynamic"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/kubernetes/test/e2e/framework"
e2epod "k8s.io/kubernetes/test/e2e/framework/pod"
e2epv "k8s.io/kubernetes/test/e2e/framework/pv"
e2eskipper "k8s.io/kubernetes/test/e2e/framework/skipper"
e2evolume "k8s.io/kubernetes/test/e2e/framework/volume"
storageframework "k8s.io/kubernetes/test/e2e/storage/framework"
"k8s.io/kubernetes/test/e2e/storage/utils"
storageutils "k8s.io/kubernetes/test/e2e/storage/utils"
)
// data file name
const datapath = "/mnt/test/data"
type snapshottableTestSuite struct {
tsInfo storageframework.TestSuiteInfo
}
var (
sDriver storageframework.SnapshottableTestDriver
dDriver storageframework.DynamicPVTestDriver
)
// InitCustomSnapshottableTestSuite returns snapshottableTestSuite that implements TestSuite interface
// using custom test patterns
func InitCustomSnapshottableTestSuite(patterns []storageframework.TestPattern) storageframework.TestSuite {
return &snapshottableTestSuite{
tsInfo: storageframework.TestSuiteInfo{
Name: "snapshottable",
TestPatterns: patterns,
SupportedSizeRange: e2evolume.SizeRange{
Min: "1Mi",
},
FeatureTag: "[Feature:VolumeSnapshotDataSource]",
},
}
}
// InitSnapshottableTestSuite returns snapshottableTestSuite that implements TestSuite interface
// using testsuite default patterns
func InitSnapshottableTestSuite() storageframework.TestSuite {
patterns := []storageframework.TestPattern{
storageframework.DynamicSnapshotDelete,
storageframework.DynamicSnapshotRetain,
storageframework.PreprovisionedSnapshotDelete,
storageframework.PreprovisionedSnapshotRetain,
}
return InitCustomSnapshottableTestSuite(patterns)
}
func (s *snapshottableTestSuite) GetTestSuiteInfo() storageframework.TestSuiteInfo {
return s.tsInfo
}
func (s *snapshottableTestSuite) SkipUnsupportedTests(driver storageframework.TestDriver, pattern storageframework.TestPattern) {
// Check preconditions.
dInfo := driver.GetDriverInfo()
ok := false
_, ok = driver.(storageframework.SnapshottableTestDriver)
if !dInfo.Capabilities[storageframework.CapSnapshotDataSource] || !ok {
e2eskipper.Skipf("Driver %q does not support snapshots - skipping", dInfo.Name)
}
_, ok = driver.(storageframework.DynamicPVTestDriver)
if !ok {
e2eskipper.Skipf("Driver %q does not support dynamic provisioning - skipping", driver.GetDriverInfo().Name)
}
}
func (s *snapshottableTestSuite) DefineTests(driver storageframework.TestDriver, pattern storageframework.TestPattern) {
// Beware that it also registers an AfterEach which renders f unusable. Any code using
// f must run inside an It or Context callback.
f := framework.NewDefaultFramework("snapshotting")
ginkgo.Describe("volume snapshot controller", func() {
var (
err error
config *storageframework.PerTestConfig
driverCleanup func()
cleanupSteps []func()
cs clientset.Interface
dc dynamic.Interface
pvc *v1.PersistentVolumeClaim
sc *storagev1.StorageClass
claimSize string
originalMntTestData string
)
init := func() {
sDriver, _ = driver.(storageframework.SnapshottableTestDriver)
dDriver, _ = driver.(storageframework.DynamicPVTestDriver)
cleanupSteps = make([]func(), 0)
// init snap class, create a source PV, PVC, Pod
cs = f.ClientSet
dc = f.DynamicClient
// Now do the more expensive test initialization.
config, driverCleanup = driver.PrepareTest(f)
cleanupSteps = append(cleanupSteps, driverCleanup)
var volumeResource *storageframework.VolumeResource
cleanupSteps = append(cleanupSteps, func() {
framework.ExpectNoError(volumeResource.CleanupResource())
})
volumeResource = storageframework.CreateVolumeResource(dDriver, config, pattern, s.GetTestSuiteInfo().SupportedSizeRange)
pvc = volumeResource.Pvc
sc = volumeResource.Sc
claimSize = pvc.Spec.Resources.Requests.Storage().String()
ginkgo.By("[init] starting a pod to use the claim")
originalMntTestData = fmt.Sprintf("hello from %s namespace", pvc.GetNamespace())
command := fmt.Sprintf("echo '%s' > %s", originalMntTestData, datapath)
pod := RunInPodWithVolume(cs, f.Timeouts, pvc.Namespace, pvc.Name, "pvc-snapshottable-tester", command, config.ClientNodeSelection)
err = e2epv.WaitForPersistentVolumeClaimPhase(v1.ClaimBound, cs, pvc.Namespace, pvc.Name, framework.Poll, f.Timeouts.ClaimProvision)
framework.ExpectNoError(err)
// Get new copy of the claim
ginkgo.By("[init] checking the claim")
pvc, err = cs.CoreV1().PersistentVolumeClaims(pvc.Namespace).Get(context.TODO(), pvc.Name, metav1.GetOptions{})
framework.ExpectNoError(err)
// Get the bound PV
ginkgo.By("[init] checking the PV")
pv, err := cs.CoreV1().PersistentVolumes().Get(context.TODO(), pvc.Spec.VolumeName, metav1.GetOptions{})
framework.ExpectNoError(err)
// At this point we know that:
// - a pod was created with a PV that's supposed to have data
//
// However there's a caching issue that @jinxu97 explained and it's related with the pod & volume
// lifecycle in windows, to understand it we first analyze what the volumemanager does:
// - when a pod is delete the volumemanager will try to cleanup the volume mounts
// - NodeUnpublishVolume: unbinds the bind mount from the container
// - Linux: the data is flushed to disk
// - Windows: we delete a symlink, data's not flushed yet to disk
// - NodeUnstageVolume: unmount the global mount
// - Linux: disk is detached
// - Windows: data is flushed to disk and the disk is detached
//
// Pod deletion might not guarantee a data flush to disk, however NodeUnstageVolume adds the logic
// to flush the data to disk (see #81690 for details).
//
// In the following code by checking if the PV is not in the node.Status.VolumesInUse field we
// ensure that the volume is not used by the node anymore (an indicator that NodeUnstageVolume has
// already finished)
if framework.NodeOSDistroIs("windows") {
nodeName := pod.Spec.NodeName
gomega.Expect(nodeName).NotTo(gomega.BeEmpty(), "pod.Spec.NodeName must not be empty")
ginkgo.By(fmt.Sprintf("[init] waiting until the node=%s is not using the volume=%s", nodeName, pv.Name))
success := storageutils.WaitUntil(framework.Poll, f.Timeouts.PVDelete, func() bool {
node, err := cs.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
framework.ExpectNoError(err)
volumesInUse := node.Status.VolumesInUse
framework.Logf("current volumes in use: %+v", volumesInUse)
for i := 0; i < len(volumesInUse); i++ {
if strings.HasSuffix(string(volumesInUse[i]), pv.Name) {
return false
}
}
return true
})
framework.ExpectEqual(success, true)
}
}
cleanup := func() {
// Don't register an AfterEach then a cleanup step because the order
// of execution will do the AfterEach first then the cleanup step.
// Also AfterEach cleanup registration is not fine grained enough
// Adding to the cleanup steps allows you to register cleanup only when it is needed
// Ideally we could replace this with https://golang.org/pkg/testing/#T.Cleanup
// Depending on how far the test executed, cleanup accordingly
// Execute in reverse order, similar to defer stack
for i := len(cleanupSteps) - 1; i >= 0; i-- {
err := storageutils.TryFunc(cleanupSteps[i])
framework.ExpectNoError(err, "while running cleanup steps")
}
}
ginkgo.BeforeEach(func() {
init()
})
ginkgo.AfterEach(func() {
cleanup()
})
ginkgo.Context("", func() {
var (
vs *unstructured.Unstructured
vscontent *unstructured.Unstructured
vsc *unstructured.Unstructured
)
ginkgo.BeforeEach(func() {
var sr *storageframework.SnapshotResource
cleanupSteps = append(cleanupSteps, func() {
framework.ExpectNoError(sr.CleanupResource(f.Timeouts))
})
parameters := map[string]string{}
sr = storageframework.CreateSnapshotResource(sDriver, config, pattern, pvc.GetName(), pvc.GetNamespace(), f.Timeouts, parameters)
vs = sr.Vs
vscontent = sr.Vscontent
vsc = sr.Vsclass
})
ginkgo.It("should check snapshot fields, check restore correctly works after modifying source data, check deletion", func() {
// Get new copy of the snapshot
ginkgo.By("checking the snapshot")
vs, err = dc.Resource(storageutils.SnapshotGVR).Namespace(vs.GetNamespace()).Get(context.TODO(), vs.GetName(), metav1.GetOptions{})
framework.ExpectNoError(err)
// Get the bound snapshotContent
snapshotStatus := vs.Object["status"].(map[string]interface{})
snapshotContentName := snapshotStatus["boundVolumeSnapshotContentName"].(string)
vscontent, err = dc.Resource(storageutils.SnapshotContentGVR).Get(context.TODO(), snapshotContentName, metav1.GetOptions{})
framework.ExpectNoError(err)
snapshotContentSpec := vscontent.Object["spec"].(map[string]interface{})
volumeSnapshotRef := snapshotContentSpec["volumeSnapshotRef"].(map[string]interface{})
// Check SnapshotContent properties
ginkgo.By("checking the SnapshotContent")
// PreprovisionedCreatedSnapshot do not need to set volume snapshot class name
if pattern.SnapshotType != storageframework.PreprovisionedCreatedSnapshot {
framework.ExpectEqual(snapshotContentSpec["volumeSnapshotClassName"], vsc.GetName())
}
framework.ExpectEqual(volumeSnapshotRef["name"], vs.GetName())
framework.ExpectEqual(volumeSnapshotRef["namespace"], vs.GetNamespace())
ginkgo.By("Modifying source data test")
var restoredPVC *v1.PersistentVolumeClaim
var restoredPod *v1.Pod
modifiedMntTestData := fmt.Sprintf("modified data from %s namespace", pvc.GetNamespace())
ginkgo.By("modifying the data in the source PVC")
command := fmt.Sprintf("echo '%s' > %s", modifiedMntTestData, datapath)
RunInPodWithVolume(cs, f.Timeouts, pvc.Namespace, pvc.Name, "pvc-snapshottable-data-tester", command, config.ClientNodeSelection)
ginkgo.By("creating a pvc from the snapshot")
restoredPVC = e2epv.MakePersistentVolumeClaim(e2epv.PersistentVolumeClaimConfig{
ClaimSize: claimSize,
StorageClassName: &(sc.Name),
}, config.Framework.Namespace.Name)
group := "snapshot.storage.k8s.io"
restoredPVC.Spec.DataSource = &v1.TypedLocalObjectReference{
APIGroup: &group,
Kind: "VolumeSnapshot",
Name: vs.GetName(),
}
restoredPVC, err = cs.CoreV1().PersistentVolumeClaims(restoredPVC.Namespace).Create(context.TODO(), restoredPVC, metav1.CreateOptions{})
framework.ExpectNoError(err)
cleanupSteps = append(cleanupSteps, func() {
framework.Logf("deleting claim %q/%q", restoredPVC.Namespace, restoredPVC.Name)
// typically this claim has already been deleted
err = cs.CoreV1().PersistentVolumeClaims(restoredPVC.Namespace).Delete(context.TODO(), restoredPVC.Name, metav1.DeleteOptions{})
if err != nil && !apierrors.IsNotFound(err) {
framework.Failf("Error deleting claim %q. Error: %v", restoredPVC.Name, err)
}
})
ginkgo.By("starting a pod to use the claim")
restoredPod = StartInPodWithVolume(cs, restoredPVC.Namespace, restoredPVC.Name, "restored-pvc-tester", "sleep 300", config.ClientNodeSelection)
cleanupSteps = append(cleanupSteps, func() {
StopPod(cs, restoredPod)
})
framework.ExpectNoError(e2epod.WaitTimeoutForPodRunningInNamespace(cs, restoredPod.Name, restoredPod.Namespace, f.Timeouts.PodStartSlow))
commands := e2evolume.GenerateReadFileCmd(datapath)
_, err = framework.LookForStringInPodExec(restoredPod.Namespace, restoredPod.Name, commands, originalMntTestData, time.Minute)
framework.ExpectNoError(err)
ginkgo.By("should delete the VolumeSnapshotContent according to its deletion policy")
// Delete both Snapshot and restored Pod/PVC at the same time because different storage systems
// have different ordering of deletion. Some may require delete the restored PVC first before
// Snapshot deletion and some are opposite.
err = storageutils.DeleteSnapshotWithoutWaiting(dc, vs.GetNamespace(), vs.GetName())
framework.ExpectNoError(err)
framework.Logf("deleting restored pod %q/%q", restoredPod.Namespace, restoredPod.Name)
err = cs.CoreV1().Pods(restoredPod.Namespace).Delete(context.TODO(), restoredPod.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err)
framework.Logf("deleting restored PVC %q/%q", restoredPVC.Namespace, restoredPVC.Name)
err = cs.CoreV1().PersistentVolumeClaims(restoredPVC.Namespace).Delete(context.TODO(), restoredPVC.Name, metav1.DeleteOptions{})
framework.ExpectNoError(err)
// Wait for the Snapshot to be actually deleted from API server
err = storageutils.WaitForNamespacedGVRDeletion(dc, storageutils.SnapshotGVR, vs.GetNamespace(), vs.GetNamespace(), framework.Poll, f.Timeouts.SnapshotDelete)
switch pattern.SnapshotDeletionPolicy {
case storageframework.DeleteSnapshot:
ginkgo.By("checking the SnapshotContent has been deleted")
err = utils.WaitForGVRDeletion(dc, storageutils.SnapshotContentGVR, vscontent.GetName(), framework.Poll, f.Timeouts.SnapshotDelete)
framework.ExpectNoError(err)
case storageframework.RetainSnapshot:
ginkgo.By("checking the SnapshotContent has not been deleted")
err = utils.WaitForGVRDeletion(dc, storageutils.SnapshotContentGVR, vscontent.GetName(), 1*time.Second /* poll */, 30*time.Second /* timeout */)
framework.ExpectError(err)
}
})
})
})
}