406 lines
13 KiB
Go
406 lines
13 KiB
Go
/*
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Copyright 2015 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 common
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import (
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"fmt"
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"time"
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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/util/intstr"
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"k8s.io/kubernetes/pkg/util/uuid"
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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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const (
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probTestContainerName = "test-webserver"
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probTestInitialDelaySeconds = 15
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defaultObservationTimeout = time.Minute * 2
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)
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var _ = framework.KubeDescribe("Probing container", func() {
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f := framework.NewDefaultFramework("container-probe")
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var podClient *framework.PodClient
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probe := webserverProbeBuilder{}
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BeforeEach(func() {
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podClient = f.PodClient()
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})
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It("with readiness probe should not be ready before initial delay and never restart [Conformance]", func() {
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p := podClient.Create(makePodSpec(probe.withInitialDelay().build(), nil))
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f.WaitForPodReady(p.Name)
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p, err := podClient.Get(p.Name, metav1.GetOptions{})
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framework.ExpectNoError(err)
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isReady, err := testutils.PodRunningReady(p)
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framework.ExpectNoError(err)
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Expect(isReady).To(BeTrue(), "pod should be ready")
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// We assume the pod became ready when the container became ready. This
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// is true for a single container pod.
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readyTime, err := getTransitionTimeForReadyCondition(p)
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framework.ExpectNoError(err)
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startedTime, err := getContainerStartedTime(p, probTestContainerName)
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framework.ExpectNoError(err)
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framework.Logf("Container started at %v, pod became ready at %v", startedTime, readyTime)
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initialDelay := probTestInitialDelaySeconds * time.Second
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if readyTime.Sub(startedTime) < initialDelay {
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framework.Failf("Pod became ready before it's %v initial delay", initialDelay)
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}
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restartCount := getRestartCount(p)
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Expect(restartCount == 0).To(BeTrue(), "pod should have a restart count of 0 but got %v", restartCount)
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})
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It("with readiness probe that fails should never be ready and never restart [Conformance]", func() {
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p := podClient.Create(makePodSpec(probe.withFailing().build(), nil))
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Consistently(func() (bool, error) {
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p, err := podClient.Get(p.Name, metav1.GetOptions{})
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if err != nil {
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return false, err
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}
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return v1.IsPodReady(p), nil
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}, 1*time.Minute, 1*time.Second).ShouldNot(BeTrue(), "pod should not be ready")
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p, err := podClient.Get(p.Name, metav1.GetOptions{})
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framework.ExpectNoError(err)
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isReady, err := testutils.PodRunningReady(p)
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Expect(isReady).NotTo(BeTrue(), "pod should be not ready")
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restartCount := getRestartCount(p)
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Expect(restartCount == 0).To(BeTrue(), "pod should have a restart count of 0 but got %v", restartCount)
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})
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It("should be restarted with a exec \"cat /tmp/health\" liveness probe [Conformance]", func() {
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runLivenessTest(f, &v1.Pod{
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ObjectMeta: v1.ObjectMeta{
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Name: "liveness-exec",
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Labels: map[string]string{"test": "liveness"},
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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: "liveness",
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Image: "gcr.io/google_containers/busybox:1.24",
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Command: []string{"/bin/sh", "-c", "echo ok >/tmp/health; sleep 10; rm -rf /tmp/health; sleep 600"},
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LivenessProbe: &v1.Probe{
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Handler: v1.Handler{
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Exec: &v1.ExecAction{
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Command: []string{"cat", "/tmp/health"},
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},
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},
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InitialDelaySeconds: 15,
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FailureThreshold: 1,
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},
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},
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},
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},
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}, 1, defaultObservationTimeout)
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})
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It("should *not* be restarted with a exec \"cat /tmp/health\" liveness probe [Conformance]", func() {
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runLivenessTest(f, &v1.Pod{
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ObjectMeta: v1.ObjectMeta{
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Name: "liveness-exec",
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Labels: map[string]string{"test": "liveness"},
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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: "liveness",
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Image: "gcr.io/google_containers/busybox:1.24",
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Command: []string{"/bin/sh", "-c", "echo ok >/tmp/health; sleep 600"},
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LivenessProbe: &v1.Probe{
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Handler: v1.Handler{
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Exec: &v1.ExecAction{
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Command: []string{"cat", "/tmp/health"},
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},
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},
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InitialDelaySeconds: 15,
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FailureThreshold: 1,
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},
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},
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},
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},
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}, 0, defaultObservationTimeout)
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})
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It("should be restarted with a /healthz http liveness probe [Conformance]", func() {
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runLivenessTest(f, &v1.Pod{
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ObjectMeta: v1.ObjectMeta{
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Name: "liveness-http",
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Labels: map[string]string{"test": "liveness"},
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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: "liveness",
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Image: "gcr.io/google_containers/liveness:e2e",
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Command: []string{"/server"},
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LivenessProbe: &v1.Probe{
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Handler: v1.Handler{
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HTTPGet: &v1.HTTPGetAction{
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Path: "/healthz",
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Port: intstr.FromInt(8080),
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},
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},
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InitialDelaySeconds: 15,
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FailureThreshold: 1,
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},
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},
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},
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},
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}, 1, defaultObservationTimeout)
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})
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// Slow by design (5 min)
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It("should have monotonically increasing restart count [Conformance] [Slow]", func() {
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runLivenessTest(f, &v1.Pod{
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ObjectMeta: v1.ObjectMeta{
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Name: "liveness-http",
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Labels: map[string]string{"test": "liveness"},
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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: "liveness",
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Image: "gcr.io/google_containers/liveness:e2e",
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Command: []string{"/server"},
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LivenessProbe: &v1.Probe{
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Handler: v1.Handler{
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HTTPGet: &v1.HTTPGetAction{
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Path: "/healthz",
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Port: intstr.FromInt(8080),
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},
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},
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InitialDelaySeconds: 5,
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FailureThreshold: 1,
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},
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},
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},
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},
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}, 5, time.Minute*5)
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})
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It("should *not* be restarted with a /healthz http liveness probe [Conformance]", func() {
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runLivenessTest(f, &v1.Pod{
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ObjectMeta: v1.ObjectMeta{
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Name: "liveness-http",
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Labels: map[string]string{"test": "liveness"},
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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: "liveness",
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Image: "gcr.io/google_containers/nginx-slim:0.7",
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Ports: []v1.ContainerPort{{ContainerPort: 80}},
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LivenessProbe: &v1.Probe{
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Handler: v1.Handler{
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HTTPGet: &v1.HTTPGetAction{
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Path: "/",
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Port: intstr.FromInt(80),
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},
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},
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InitialDelaySeconds: 15,
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TimeoutSeconds: 5,
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FailureThreshold: 1,
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},
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},
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},
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},
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}, 0, defaultObservationTimeout)
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})
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It("should be restarted with a docker exec liveness probe with timeout [Conformance]", func() {
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// TODO: enable this test once the default exec handler supports timeout.
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Skip("The default exec handler, dockertools.NativeExecHandler, does not support timeouts due to a limitation in the Docker Remote API")
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runLivenessTest(f, &v1.Pod{
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ObjectMeta: v1.ObjectMeta{
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Name: "liveness-exec",
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Labels: map[string]string{"test": "liveness"},
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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: "liveness",
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Image: "gcr.io/google_containers/busybox:1.24",
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Command: []string{"/bin/sh", "-c", "sleep 600"},
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LivenessProbe: &v1.Probe{
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Handler: v1.Handler{
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Exec: &v1.ExecAction{
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Command: []string{"/bin/sh", "-c", "sleep 10"},
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},
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},
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InitialDelaySeconds: 15,
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TimeoutSeconds: 1,
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FailureThreshold: 1,
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},
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},
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},
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},
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}, 1, defaultObservationTimeout)
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})
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})
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func getContainerStartedTime(p *v1.Pod, containerName string) (time.Time, error) {
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for _, status := range p.Status.ContainerStatuses {
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if status.Name != containerName {
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continue
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}
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if status.State.Running == nil {
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return time.Time{}, fmt.Errorf("Container is not running")
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}
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return status.State.Running.StartedAt.Time, nil
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}
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return time.Time{}, fmt.Errorf("cannot find container named %q", containerName)
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}
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func getTransitionTimeForReadyCondition(p *v1.Pod) (time.Time, error) {
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for _, cond := range p.Status.Conditions {
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if cond.Type == v1.PodReady {
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return cond.LastTransitionTime.Time, nil
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}
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}
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return time.Time{}, fmt.Errorf("No ready condition can be found for pod")
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}
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func getRestartCount(p *v1.Pod) int {
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count := 0
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for _, containerStatus := range p.Status.ContainerStatuses {
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count += int(containerStatus.RestartCount)
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}
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return count
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}
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func makePodSpec(readinessProbe, livenessProbe *v1.Probe) *v1.Pod {
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pod := &v1.Pod{
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ObjectMeta: v1.ObjectMeta{Name: "test-webserver-" + string(uuid.NewUUID())},
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: probTestContainerName,
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Image: "gcr.io/google_containers/test-webserver:e2e",
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LivenessProbe: livenessProbe,
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ReadinessProbe: readinessProbe,
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},
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},
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},
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}
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return pod
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}
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type webserverProbeBuilder struct {
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failing bool
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initialDelay bool
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}
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func (b webserverProbeBuilder) withFailing() webserverProbeBuilder {
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b.failing = true
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return b
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}
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func (b webserverProbeBuilder) withInitialDelay() webserverProbeBuilder {
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b.initialDelay = true
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return b
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}
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func (b webserverProbeBuilder) build() *v1.Probe {
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probe := &v1.Probe{
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Handler: v1.Handler{
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HTTPGet: &v1.HTTPGetAction{
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Port: intstr.FromInt(80),
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Path: "/",
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},
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},
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}
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if b.initialDelay {
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probe.InitialDelaySeconds = probTestInitialDelaySeconds
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}
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if b.failing {
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probe.HTTPGet.Port = intstr.FromInt(81)
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}
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return probe
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}
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func runLivenessTest(f *framework.Framework, pod *v1.Pod, expectNumRestarts int, timeout time.Duration) {
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podClient := f.PodClient()
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ns := f.Namespace.Name
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Expect(pod.Spec.Containers).NotTo(BeEmpty())
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containerName := pod.Spec.Containers[0].Name
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// At the end of the test, clean up by removing the pod.
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defer func() {
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By("deleting the pod")
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podClient.Delete(pod.Name, v1.NewDeleteOptions(0))
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}()
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By(fmt.Sprintf("Creating pod %s in namespace %s", pod.Name, ns))
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podClient.Create(pod)
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// Wait until the pod is not pending. (Here we need to check for something other than
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// 'Pending' other than checking for 'Running', since when failures occur, we go to
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// 'Terminated' which can cause indefinite blocking.)
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framework.ExpectNoError(framework.WaitForPodNotPending(f.ClientSet, ns, pod.Name, pod.ResourceVersion),
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fmt.Sprintf("starting pod %s in namespace %s", pod.Name, ns))
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framework.Logf("Started pod %s in namespace %s", pod.Name, ns)
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// Check the pod's current state and verify that restartCount is present.
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By("checking the pod's current state and verifying that restartCount is present")
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pod, err := podClient.Get(pod.Name, metav1.GetOptions{})
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framework.ExpectNoError(err, fmt.Sprintf("getting pod %s in namespace %s", pod.Name, ns))
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initialRestartCount := v1.GetExistingContainerStatus(pod.Status.ContainerStatuses, containerName).RestartCount
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framework.Logf("Initial restart count of pod %s is %d", pod.Name, initialRestartCount)
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// Wait for the restart state to be as desired.
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deadline := time.Now().Add(timeout)
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lastRestartCount := initialRestartCount
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observedRestarts := int32(0)
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for start := time.Now(); time.Now().Before(deadline); time.Sleep(2 * time.Second) {
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pod, err = podClient.Get(pod.Name, metav1.GetOptions{})
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framework.ExpectNoError(err, fmt.Sprintf("getting pod %s", pod.Name))
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restartCount := v1.GetExistingContainerStatus(pod.Status.ContainerStatuses, containerName).RestartCount
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if restartCount != lastRestartCount {
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framework.Logf("Restart count of pod %s/%s is now %d (%v elapsed)",
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ns, pod.Name, restartCount, time.Since(start))
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if restartCount < lastRestartCount {
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framework.Failf("Restart count should increment monotonically: restart cont of pod %s/%s changed from %d to %d",
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ns, pod.Name, lastRestartCount, restartCount)
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}
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}
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observedRestarts = restartCount - initialRestartCount
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if expectNumRestarts > 0 && int(observedRestarts) >= expectNumRestarts {
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// Stop if we have observed more than expectNumRestarts restarts.
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break
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}
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lastRestartCount = restartCount
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}
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// If we expected 0 restarts, fail if observed any restart.
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// If we expected n restarts (n > 0), fail if we observed < n restarts.
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if (expectNumRestarts == 0 && observedRestarts > 0) || (expectNumRestarts > 0 &&
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int(observedRestarts) < expectNumRestarts) {
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framework.Failf("pod %s/%s - expected number of restarts: %d, found restarts: %d",
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ns, pod.Name, expectNumRestarts, observedRestarts)
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}
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}
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