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e2e test for dynamic provisioning. #21140
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Original file line number | Diff line number | Diff line change |
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/* | ||
Copyright 2016 The Kubernetes Authors All rights reserved. | ||
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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 | ||
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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 | ||
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. | ||
*/ | ||
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package e2e | ||
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import ( | ||
"time" | ||
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"k8s.io/kubernetes/pkg/api" | ||
"k8s.io/kubernetes/pkg/api/resource" | ||
"k8s.io/kubernetes/pkg/api/unversioned" | ||
client "k8s.io/kubernetes/pkg/client/unversioned" | ||
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. "github.com/onsi/ginkgo" | ||
. "github.com/onsi/gomega" | ||
) | ||
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const ( | ||
// Requested size of the volume | ||
requestedSize = "1500Mi" | ||
// Expected size of the volume is 2GiB, because all three supported cloud | ||
// providers allocate volumes in 1GiB chunks. | ||
expectedSize = "2Gi" | ||
) | ||
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var _ = Describe("Dynamic provisioning", func() { | ||
framework := NewDefaultFramework("volume-provisioning") | ||
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// filled in BeforeEach | ||
var c *client.Client | ||
var ns string | ||
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BeforeEach(func() { | ||
c = framework.Client | ||
ns = framework.Namespace.Name | ||
}) | ||
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Describe("DynamicProvisioner", func() { | ||
It("should create and delete persistent volumes", func() { | ||
SkipUnlessProviderIs("openstack", "gce", "aws") | ||
By("creating a claim with a dynamic provisioning annotation") | ||
claim := createClaim(ns) | ||
defer func() { | ||
c.PersistentVolumeClaims(ns).Delete(claim.Name) | ||
}() | ||
claim, err := c.PersistentVolumeClaims(ns).Create(claim) | ||
Expect(err).NotTo(HaveOccurred()) | ||
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err = waitForPersistentVolumeClaimPhase(api.ClaimBound, c, ns, claim.Name, poll, claimProvisionTimeout) | ||
Expect(err).NotTo(HaveOccurred()) | ||
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By("checking the claim") | ||
// Get new copy of the claim | ||
claim, err = c.PersistentVolumeClaims(ns).Get(claim.Name) | ||
Expect(err).NotTo(HaveOccurred()) | ||
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// Get the bound PV | ||
pv, err := c.PersistentVolumes().Get(claim.Spec.VolumeName) | ||
Expect(err).NotTo(HaveOccurred()) | ||
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// Check sizes | ||
expectedCapacity := resource.MustParse(expectedSize) | ||
pvCapacity := pv.Spec.Capacity[api.ResourceName(api.ResourceStorage)] | ||
Expect(pvCapacity.Value()).To(Equal(expectedCapacity.Value())) | ||
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requestedCapacity := resource.MustParse(requestedSize) | ||
claimCapacity := claim.Spec.Resources.Requests[api.ResourceName(api.ResourceStorage)] | ||
Expect(claimCapacity.Value()).To(Equal(requestedCapacity.Value())) | ||
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// Check PV properties | ||
Expect(pv.Spec.PersistentVolumeReclaimPolicy).To(Equal(api.PersistentVolumeReclaimDelete)) | ||
expectedAccessModes := []api.PersistentVolumeAccessMode{api.ReadWriteOnce} | ||
Expect(pv.Spec.AccessModes).To(Equal(expectedAccessModes)) | ||
Expect(pv.Spec.ClaimRef.Name).To(Equal(claim.ObjectMeta.Name)) | ||
Expect(pv.Spec.ClaimRef.Namespace).To(Equal(claim.ObjectMeta.Namespace)) | ||
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// We start two pods: | ||
// - The first writes 'hello word' to the /mnt/test (= the volume). | ||
// - The second one runs grep 'hello world' on /mnt/test. | ||
// If both suceed, Kubernetes actually allocated something that is | ||
// persistent across pods. | ||
By("checking the created volume is writable") | ||
runInPodWithVolume(c, ns, claim.Name, "echo 'hello world' > /mnt/test/data") | ||
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By("checking the created volume is readable and retains data") | ||
runInPodWithVolume(c, ns, claim.Name, "grep 'hello world' /mnt/test/data") | ||
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// Ugly hack: if we delete the AWS/GCE/OpenStack volume here, it will | ||
// probably collide with destruction of the pods above - the pods | ||
// still have the volume attached (kubelet is slow...) and deletion | ||
// of attached volume is not allowed by AWS/GCE/OpenStack. | ||
// Kubernetes *will* retry deletion several times in | ||
// pvclaimbinder-sync-period. | ||
// So, technically, this sleep is not needed. On the other hand, | ||
// the sync perion is 10 minutes and we really don't want to wait | ||
// 10 minutes here. There is no way how to see if kubelet is | ||
// finished with cleaning volumes. A small sleep here actually | ||
// speeds up the test! | ||
// One minute should be enough to clean up the pods properly. | ||
// Detaching e.g. a Cinder volume takes some time. | ||
By("Sleeping to let kubelet destroy all pods") | ||
time.Sleep(time.Minute) | ||
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By("deleting the claim") | ||
expectNoError(c.PersistentVolumeClaims(ns).Delete(claim.Name)) | ||
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// Wait for the PV to get deleted too. | ||
expectNoError(waitForPersistentVolumeDeleted(c, pv.Name, 1*time.Second, 10*time.Minute)) | ||
}) | ||
}) | ||
}) | ||
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func createClaim(ns string) *api.PersistentVolumeClaim { | ||
return &api.PersistentVolumeClaim{ | ||
ObjectMeta: api.ObjectMeta{ | ||
GenerateName: "pvc-", | ||
Namespace: ns, | ||
Annotations: map[string]string{ | ||
"volume.alpha.kubernetes.io/storage-class": "", | ||
}, | ||
}, | ||
Spec: api.PersistentVolumeClaimSpec{ | ||
AccessModes: []api.PersistentVolumeAccessMode{ | ||
api.ReadWriteOnce, | ||
}, | ||
Resources: api.ResourceRequirements{ | ||
Requests: api.ResourceList{ | ||
api.ResourceName(api.ResourceStorage): resource.MustParse(requestedSize), | ||
}, | ||
}, | ||
}, | ||
} | ||
} | ||
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// runInPodWithVolume runs a command in a pod with given claim mounted to /mnt directory. | ||
func runInPodWithVolume(c *client.Client, ns, claimName, command string) { | ||
pod := &api.Pod{ | ||
TypeMeta: unversioned.TypeMeta{ | ||
Kind: "Pod", | ||
APIVersion: "v1", | ||
}, | ||
ObjectMeta: api.ObjectMeta{ | ||
GenerateName: "pvc-volume-tester-", | ||
}, | ||
Spec: api.PodSpec{ | ||
Containers: []api.Container{ | ||
{ | ||
Name: "volume-tester", | ||
Image: "gcr.io/google_containers/busybox", | ||
Command: []string{"/bin/sh"}, | ||
Args: []string{"-c", command}, | ||
VolumeMounts: []api.VolumeMount{ | ||
{ | ||
Name: "my-volume", | ||
MountPath: "/mnt/test", | ||
}, | ||
}, | ||
}, | ||
}, | ||
RestartPolicy: api.RestartPolicyNever, | ||
Volumes: []api.Volume{ | ||
{ | ||
Name: "my-volume", | ||
VolumeSource: api.VolumeSource{ | ||
PersistentVolumeClaim: &api.PersistentVolumeClaimVolumeSource{ | ||
ClaimName: claimName, | ||
ReadOnly: false, | ||
}, | ||
}, | ||
}, | ||
}, | ||
}, | ||
} | ||
pod, err := c.Pods(ns).Create(pod) | ||
defer func() { | ||
expectNoError(c.Pods(ns).Delete(pod.Name, nil)) | ||
}() | ||
expectNoError(err, "Failed to create pod: %v", err) | ||
expectNoError(waitForPodSuccessInNamespaceSlow(c, pod.Name, pod.Spec.Containers[0].Name, pod.Namespace)) | ||
} |
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Not for this PR. But this reminds me that we need to think through the logic that triggers deletion of auto-provisioned volumes. Opened up #22975