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[k8s.io] Kubelet metrics api when querying /stats/summary [It] it should report resource usage through the stats api And the logs show following error: Jun 21 15:57:13 localhost journal: tee: /test-empty-dir-mnt: Is a directory
445 lines
15 KiB
Go
445 lines
15 KiB
Go
/*
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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");
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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_node
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"strings"
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"time"
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"k8s.io/kubernetes/pkg/api"
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apiUnversioned "k8s.io/kubernetes/pkg/api/unversioned"
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"k8s.io/kubernetes/pkg/kubelet/api/v1alpha1/stats"
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"k8s.io/kubernetes/pkg/util"
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"k8s.io/kubernetes/pkg/util/sets"
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"k8s.io/kubernetes/test/e2e/framework"
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"github.com/davecgh/go-spew/spew"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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var _ = framework.KubeDescribe("Kubelet", func() {
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f := NewDefaultFramework("kubelet-test")
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Context("when scheduling a busybox command in a pod", func() {
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podName := "busybox-scheduling-" + string(util.NewUUID())
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It("it should print the output to logs", func() {
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podClient := f.Client.Pods(f.Namespace.Name)
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pod := &api.Pod{
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ObjectMeta: api.ObjectMeta{
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Name: podName,
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},
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Spec: api.PodSpec{
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// Force the Pod to schedule to the node without a scheduler running
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NodeName: *nodeName,
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// Don't restart the Pod since it is expected to exit
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RestartPolicy: api.RestartPolicyNever,
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Containers: []api.Container{
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{
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Image: ImageRegistry[busyBoxImage],
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Name: podName,
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Command: []string{"sh", "-c", "echo 'Hello World' ; sleep 240"},
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},
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},
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},
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}
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defer podClient.Delete(pod.Name, nil)
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_, err := podClient.Create(pod)
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Expect(err).To(BeNil(), fmt.Sprintf("Error creating Pod %v", err))
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framework.ExpectNoError(f.WaitForPodRunning(pod.Name))
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Eventually(func() string {
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sinceTime := apiUnversioned.NewTime(time.Now().Add(time.Duration(-1 * time.Hour)))
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rc, err := podClient.GetLogs(podName, &api.PodLogOptions{SinceTime: &sinceTime}).Stream()
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if err != nil {
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return ""
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}
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defer rc.Close()
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buf := new(bytes.Buffer)
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buf.ReadFrom(rc)
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return buf.String()
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}, time.Minute, time.Second*4).Should(Equal("Hello World\n"))
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})
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})
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Context("when scheduling a read only busybox container", func() {
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podName := "busybox-readonly-fs" + string(util.NewUUID())
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It("it should not write to root filesystem", func() {
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podClient := f.Client.Pods(f.Namespace.Name)
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isReadOnly := true
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pod := &api.Pod{
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ObjectMeta: api.ObjectMeta{
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Name: podName,
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},
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Spec: api.PodSpec{
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// Force the Pod to schedule to the node without a scheduler running
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NodeName: *nodeName,
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// Don't restart the Pod since it is expected to exit
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RestartPolicy: api.RestartPolicyNever,
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Containers: []api.Container{
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{
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Image: ImageRegistry[busyBoxImage],
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Name: podName,
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Command: []string{"sh", "-c", "echo test > /file; sleep 240"},
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SecurityContext: &api.SecurityContext{
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ReadOnlyRootFilesystem: &isReadOnly,
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},
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},
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},
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},
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}
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defer podClient.Delete(pod.Name, nil)
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_, err := podClient.Create(pod)
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Expect(err).To(BeNil(), fmt.Sprintf("Error creating Pod %v", err))
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Eventually(func() string {
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rc, err := podClient.GetLogs(podName, &api.PodLogOptions{}).Stream()
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if err != nil {
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return ""
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}
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defer rc.Close()
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buf := new(bytes.Buffer)
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buf.ReadFrom(rc)
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return buf.String()
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}, time.Minute, time.Second*4).Should(Equal("sh: can't create /file: Read-only file system\n"))
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})
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})
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Describe("metrics api", func() {
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Context("when querying /stats/summary", func() {
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It("it should report resource usage through the stats api", func() {
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podNamePrefix := "stats-busybox-" + string(util.NewUUID())
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volumeNamePrefix := "test-empty-dir"
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podNames, volumes := createSummaryTestPods(f, podNamePrefix, 2, volumeNamePrefix)
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By("Returning stats summary")
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summary := stats.Summary{}
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Eventually(func() error {
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resp, err := http.Get(*kubeletAddress + "/stats/summary")
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if err != nil {
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return fmt.Errorf("Failed to get /stats/summary - %v", err)
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}
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contentsBytes, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return fmt.Errorf("Failed to read /stats/summary - %+v", resp)
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}
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contents := string(contentsBytes)
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decoder := json.NewDecoder(strings.NewReader(contents))
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err = decoder.Decode(&summary)
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if err != nil {
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return fmt.Errorf("Failed to parse /stats/summary to go struct: %+v", resp)
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}
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missingPods := podsMissingFromSummary(summary, podNames)
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if missingPods.Len() != 0 {
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return fmt.Errorf("expected pods not found. Following pods are missing - %v", missingPods)
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}
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missingVolumes := volumesMissingFromSummary(summary, volumes)
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if missingVolumes.Len() != 0 {
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return fmt.Errorf("expected volumes not found. Following volumes are missing - %v", missingVolumes)
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}
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if err := testSummaryMetrics(summary, podNamePrefix); err != nil {
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return err
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}
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return nil
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}, 5*time.Minute, time.Second*4).Should(BeNil())
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})
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})
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})
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})
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const (
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containerSuffix = "-c"
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)
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func createSummaryTestPods(f *framework.Framework, podNamePrefix string, count int, volumeNamePrefix string) (sets.String, sets.String) {
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podNames := sets.NewString()
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volumes := sets.NewString(volumeNamePrefix)
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for i := 0; i < count; i++ {
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podNames.Insert(fmt.Sprintf("%s%v", podNamePrefix, i))
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}
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for _, podName := range podNames.List() {
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createPod(f, podName, []api.Container{
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{
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Image: ImageRegistry[busyBoxImage],
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Command: []string{"sh", "-c", "while true; do echo 'hello world' | tee /test-empty-dir-mnt/file ; sleep 1; done"},
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Name: podName + containerSuffix,
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VolumeMounts: []api.VolumeMount{
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{MountPath: "/test-empty-dir-mnt", Name: volumeNamePrefix},
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},
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},
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}, []api.Volume{
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// TODO: Test secret volumes
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// TODO: Test hostpath volumes
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{Name: volumeNamePrefix, VolumeSource: api.VolumeSource{EmptyDir: &api.EmptyDirVolumeSource{}}},
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})
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}
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return podNames, volumes
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}
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func createPod(f *framework.Framework, podName string, containers []api.Container, volumes []api.Volume) {
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podClient := f.Client.Pods(f.Namespace.Name)
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pod := &api.Pod{
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ObjectMeta: api.ObjectMeta{
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Name: podName,
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},
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Spec: api.PodSpec{
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// Force the Pod to schedule to the node without a scheduler running
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NodeName: *nodeName,
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// Don't restart the Pod since it is expected to exit
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RestartPolicy: api.RestartPolicyNever,
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Containers: containers,
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Volumes: volumes,
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},
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}
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_, err := podClient.Create(pod)
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Expect(err).To(BeNil(), fmt.Sprintf("Error creating Pod %v", err))
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framework.ExpectNoError(f.WaitForPodRunning(pod.Name))
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}
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// Returns pods missing from summary.
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func podsMissingFromSummary(s stats.Summary, expectedPods sets.String) sets.String {
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expectedPods = sets.StringKeySet(expectedPods)
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for _, pod := range s.Pods {
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if expectedPods.Has(pod.PodRef.Name) {
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expectedPods.Delete(pod.PodRef.Name)
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}
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}
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return expectedPods
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}
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// Returns volumes missing from summary.
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func volumesMissingFromSummary(s stats.Summary, expectedVolumes sets.String) sets.String {
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for _, pod := range s.Pods {
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expectedPodVolumes := sets.StringKeySet(expectedVolumes)
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for _, vs := range pod.VolumeStats {
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if expectedPodVolumes.Has(vs.Name) {
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expectedPodVolumes.Delete(vs.Name)
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}
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}
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if expectedPodVolumes.Len() != 0 {
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return expectedPodVolumes
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}
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}
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return sets.NewString()
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}
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func testSummaryMetrics(s stats.Summary, podNamePrefix string) error {
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const (
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nonNilValue = "expected %q to not be nil"
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nonZeroValue = "expected %q to not be zero"
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)
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if s.Node.NodeName != *nodeName {
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return fmt.Errorf("unexpected node name - %q", s.Node.NodeName)
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}
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if s.Node.CPU.UsageCoreNanoSeconds == nil {
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return fmt.Errorf(nonNilValue, "cpu instantaneous")
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}
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if *s.Node.CPU.UsageCoreNanoSeconds == 0 {
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return fmt.Errorf(nonZeroValue, "cpu instantaneous")
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}
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if s.Node.Memory.UsageBytes == nil {
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return fmt.Errorf(nonNilValue, "memory")
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}
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if *s.Node.Memory.UsageBytes == 0 {
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return fmt.Errorf(nonZeroValue, "memory")
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}
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if s.Node.Memory.WorkingSetBytes == nil {
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return fmt.Errorf(nonNilValue, "memory working set")
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}
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if *s.Node.Memory.WorkingSetBytes == 0 {
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return fmt.Errorf(nonZeroValue, "memory working set")
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}
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if s.Node.Fs.AvailableBytes == nil {
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return fmt.Errorf(nonNilValue, "memory working set")
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}
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if *s.Node.Fs.AvailableBytes == 0 {
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return fmt.Errorf(nonZeroValue, "node Fs available")
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}
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if s.Node.Fs.CapacityBytes == nil {
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return fmt.Errorf(nonNilValue, "node fs capacity")
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}
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if *s.Node.Fs.CapacityBytes == 0 {
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return fmt.Errorf(nonZeroValue, "node fs capacity")
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}
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if s.Node.Fs.UsedBytes == nil {
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return fmt.Errorf(nonNilValue, "node fs used")
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}
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if *s.Node.Fs.UsedBytes == 0 {
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return fmt.Errorf(nonZeroValue, "node fs used")
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}
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if s.Node.Runtime == nil {
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return fmt.Errorf(nonNilValue, "node runtime")
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}
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if s.Node.Runtime.ImageFs == nil {
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return fmt.Errorf(nonNilValue, "runtime image Fs")
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}
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if s.Node.Runtime.ImageFs.AvailableBytes == nil {
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return fmt.Errorf(nonNilValue, "runtime image Fs available")
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}
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if *s.Node.Runtime.ImageFs.AvailableBytes == 0 {
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return fmt.Errorf(nonZeroValue, "runtime image Fs available")
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}
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if s.Node.Runtime.ImageFs.CapacityBytes == nil {
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return fmt.Errorf(nonNilValue, "runtime image Fs capacity")
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}
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if *s.Node.Runtime.ImageFs.CapacityBytes == 0 {
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return fmt.Errorf(nonZeroValue, "runtime image Fs capacity")
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}
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if s.Node.Runtime.ImageFs.UsedBytes == nil {
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return fmt.Errorf(nonNilValue, "runtime image Fs usage")
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}
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if *s.Node.Runtime.ImageFs.UsedBytes == 0 {
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return fmt.Errorf(nonZeroValue, "runtime image Fs usage")
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}
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sysContainers := map[string]stats.ContainerStats{}
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for _, container := range s.Node.SystemContainers {
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sysContainers[container.Name] = container
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if err := expectContainerStatsNotEmpty(&container); err != nil {
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return err
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}
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}
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if _, exists := sysContainers["kubelet"]; !exists {
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return fmt.Errorf("expected metrics for kubelet")
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}
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if _, exists := sysContainers["runtime"]; !exists {
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return fmt.Errorf("expected metrics for runtime")
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}
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// Verify Pods Stats are present
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podsList := []string{}
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By("Having resources for pods")
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for _, pod := range s.Pods {
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if !strings.HasPrefix(pod.PodRef.Name, podNamePrefix) {
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// Ignore pods created outside this test
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continue
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}
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podsList = append(podsList, pod.PodRef.Name)
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if len(pod.Containers) != 1 {
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return fmt.Errorf("expected only one container")
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}
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container := pod.Containers[0]
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if container.Name != (pod.PodRef.Name + containerSuffix) {
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return fmt.Errorf("unexpected container name - %q", container.Name)
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}
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if err := expectContainerStatsNotEmpty(&container); err != nil {
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return err
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}
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// emptydir volume
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foundExpectedVolume := false
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for _, vs := range pod.VolumeStats {
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if *vs.CapacityBytes == 0 {
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return fmt.Errorf(nonZeroValue, "volume capacity")
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}
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if *vs.AvailableBytes == 0 {
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return fmt.Errorf(nonZeroValue, "volume available")
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}
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if *vs.UsedBytes == 0 {
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return fmt.Errorf(nonZeroValue, "volume used")
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}
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if vs.Name == "test-empty-dir" {
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foundExpectedVolume = true
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}
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}
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if !foundExpectedVolume {
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return fmt.Errorf("expected 'test-empty-dir' volume")
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}
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// fs usage (not for system containers)
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if container.Rootfs == nil {
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return fmt.Errorf(nonNilValue+" - "+spew.Sdump(container), "container root fs")
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}
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if container.Rootfs.AvailableBytes == nil {
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return fmt.Errorf(nonNilValue+" - "+spew.Sdump(container), "container root fs available")
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}
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if *container.Rootfs.AvailableBytes == 0 {
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return fmt.Errorf(nonZeroValue+" - "+spew.Sdump(container), "container root fs available")
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}
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if container.Rootfs.CapacityBytes == nil {
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return fmt.Errorf(nonNilValue+" - "+spew.Sdump(container), "container root fs capacity")
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}
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if *container.Rootfs.CapacityBytes == 0 {
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return fmt.Errorf(nonZeroValue+" - "+spew.Sdump(container), "container root fs capacity")
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}
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if container.Rootfs.UsedBytes == nil {
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return fmt.Errorf(nonNilValue+" - "+spew.Sdump(container), "container root fs usage")
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}
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if *container.Rootfs.UsedBytes == 0 {
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return fmt.Errorf(nonZeroValue+" - "+spew.Sdump(container), "container root fs usage")
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}
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if container.Logs == nil {
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return fmt.Errorf(nonNilValue+" - "+spew.Sdump(container), "container logs")
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}
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if container.Logs.AvailableBytes == nil {
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return fmt.Errorf(nonNilValue+" - "+spew.Sdump(container), "container logs available")
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}
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if *container.Logs.AvailableBytes == 0 {
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return fmt.Errorf(nonZeroValue+" - "+spew.Sdump(container), "container logs available")
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}
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if container.Logs.CapacityBytes == nil {
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return fmt.Errorf(nonNilValue+" - "+spew.Sdump(container), "container logs capacity")
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}
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if *container.Logs.CapacityBytes == 0 {
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return fmt.Errorf(nonZeroValue+" - "+spew.Sdump(container), "container logs capacity")
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}
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if container.Logs.UsedBytes == nil {
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return fmt.Errorf(nonNilValue+" - "+spew.Sdump(container), "container logs usage")
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}
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if *container.Logs.UsedBytes == 0 {
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return fmt.Errorf(nonZeroValue+" - "+spew.Sdump(container), "container logs usage")
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}
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}
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return nil
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}
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func expectContainerStatsNotEmpty(container *stats.ContainerStats) error {
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// TODO: Test Network
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if container.CPU == nil {
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return fmt.Errorf("expected container cpu to be not nil - %q", spew.Sdump(container))
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}
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if container.CPU.UsageCoreNanoSeconds == nil {
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return fmt.Errorf("expected container cpu instantaneous usage to be not nil - %q", spew.Sdump(container))
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}
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if *container.CPU.UsageCoreNanoSeconds == 0 {
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return fmt.Errorf("expected container cpu instantaneous usage to be non zero - %q", spew.Sdump(container))
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}
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if container.Memory == nil {
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return fmt.Errorf("expected container memory to be not nil - %q", spew.Sdump(container))
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}
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if container.Memory.UsageBytes == nil {
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return fmt.Errorf("expected container memory usage to be not nil - %q", spew.Sdump(container))
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}
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if *container.Memory.UsageBytes == 0 {
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return fmt.Errorf("expected container memory usage to be non zero - %q", spew.Sdump(container))
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}
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if container.Memory.WorkingSetBytes == nil {
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return fmt.Errorf("expected container memory working set to be not nil - %q", spew.Sdump(container))
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}
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if *container.Memory.WorkingSetBytes == 0 {
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return fmt.Errorf("expected container memory working set to be non zero - %q", spew.Sdump(container))
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}
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return nil
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}
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