mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
synced 2025-11-03 19:58:17 +00:00
332 lines
11 KiB
Go
332 lines
11 KiB
Go
/*
|
|
Copyright 2016 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 e2e_node
|
|
|
|
import (
|
|
"fmt"
|
|
"strconv"
|
|
"time"
|
|
|
|
"k8s.io/api/core/v1"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
internalapi "k8s.io/cri-api/pkg/apis"
|
|
runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
|
|
"k8s.io/kubernetes/pkg/kubelet/types"
|
|
"k8s.io/kubernetes/test/e2e/framework"
|
|
|
|
. "github.com/onsi/ginkgo"
|
|
. "github.com/onsi/gomega"
|
|
)
|
|
|
|
const (
|
|
//TODO (dashpole): Once dynamic config is possible, test different values for maxPerPodContainer and maxContainers
|
|
// Currently using default values for maxPerPodContainer and maxTotalContainers
|
|
maxPerPodContainer = 1
|
|
maxTotalContainers = -1
|
|
|
|
garbageCollectDuration = 3 * time.Minute
|
|
setupDuration = 10 * time.Minute
|
|
runtimePollInterval = 10 * time.Second
|
|
)
|
|
|
|
type testPodSpec struct {
|
|
podName string
|
|
// containerPrefix must be unique for each pod, and cannot end in a number.
|
|
// containerPrefix is used to identify which containers belong to which pod in the test.
|
|
containerPrefix string
|
|
// the number of times each container should restart
|
|
restartCount int32
|
|
// the number of containers in the test pod
|
|
numContainers int
|
|
// a function that returns the number of containers currently on the node (including dead containers).
|
|
getContainerNames func() ([]string, error)
|
|
}
|
|
|
|
func (pod *testPodSpec) getContainerName(containerNumber int) string {
|
|
return fmt.Sprintf("%s%d", pod.containerPrefix, containerNumber)
|
|
}
|
|
|
|
type testRun struct {
|
|
// Name for logging purposes
|
|
testName string
|
|
// Pod specs for the test
|
|
testPods []*testPodSpec
|
|
}
|
|
|
|
// GarbageCollect tests that the Kubelet conforms to the Kubelet Garbage Collection Policy, found here:
|
|
// http://kubernetes.io/docs/admin/garbage-collection/
|
|
var _ = framework.KubeDescribe("GarbageCollect [Serial][NodeFeature:GarbageCollect]", func() {
|
|
f := framework.NewDefaultFramework("garbage-collect-test")
|
|
containerNamePrefix := "gc-test-container-"
|
|
podNamePrefix := "gc-test-pod-"
|
|
|
|
// These suffixes are appended to pod and container names.
|
|
// They differentiate pods from one another, and allow filtering
|
|
// by names to identify which containers belong to which pods
|
|
// They must be unique, and must not end in a number
|
|
first_suffix := "one-container-no-restarts"
|
|
second_suffix := "many-containers-many-restarts-one-pod"
|
|
third_suffix := "many-containers-many-restarts-"
|
|
tests := []testRun{
|
|
{
|
|
testName: "One Non-restarting Container",
|
|
testPods: []*testPodSpec{
|
|
{
|
|
podName: podNamePrefix + first_suffix,
|
|
containerPrefix: containerNamePrefix + first_suffix,
|
|
restartCount: 0,
|
|
numContainers: 1,
|
|
},
|
|
},
|
|
},
|
|
{
|
|
testName: "Many Restarting Containers",
|
|
testPods: []*testPodSpec{
|
|
{
|
|
podName: podNamePrefix + second_suffix,
|
|
containerPrefix: containerNamePrefix + second_suffix,
|
|
restartCount: 4,
|
|
numContainers: 4,
|
|
},
|
|
},
|
|
},
|
|
{
|
|
testName: "Many Pods with Many Restarting Containers",
|
|
testPods: []*testPodSpec{
|
|
{
|
|
podName: podNamePrefix + third_suffix + "one",
|
|
containerPrefix: containerNamePrefix + third_suffix + "one",
|
|
restartCount: 3,
|
|
numContainers: 4,
|
|
},
|
|
{
|
|
podName: podNamePrefix + third_suffix + "two",
|
|
containerPrefix: containerNamePrefix + third_suffix + "two",
|
|
restartCount: 2,
|
|
numContainers: 6,
|
|
},
|
|
{
|
|
podName: podNamePrefix + third_suffix + "three",
|
|
containerPrefix: containerNamePrefix + third_suffix + "three",
|
|
restartCount: 3,
|
|
numContainers: 5,
|
|
},
|
|
},
|
|
},
|
|
}
|
|
for _, test := range tests {
|
|
containerGCTest(f, test)
|
|
}
|
|
})
|
|
|
|
// Tests the following:
|
|
// pods are created, and all containers restart the specified number of times
|
|
// while containers are running, the number of copies of a single container does not exceed maxPerPodContainer
|
|
// while containers are running, the total number of containers does not exceed maxTotalContainers
|
|
// while containers are running, if not constrained by maxPerPodContainer or maxTotalContainers, keep an extra copy of each container
|
|
// once pods are killed, all containers are eventually cleaned up
|
|
func containerGCTest(f *framework.Framework, test testRun) {
|
|
var runtime internalapi.RuntimeService
|
|
BeforeEach(func() {
|
|
var err error
|
|
runtime, _, err = getCRIClient()
|
|
Expect(err).NotTo(HaveOccurred())
|
|
})
|
|
for _, pod := range test.testPods {
|
|
// Initialize the getContainerNames function to use CRI runtime client.
|
|
pod.getContainerNames = func() ([]string, error) {
|
|
relevantContainers := []string{}
|
|
containers, err := runtime.ListContainers(&runtimeapi.ContainerFilter{
|
|
LabelSelector: map[string]string{
|
|
types.KubernetesPodNameLabel: pod.podName,
|
|
types.KubernetesPodNamespaceLabel: f.Namespace.Name,
|
|
},
|
|
})
|
|
if err != nil {
|
|
return relevantContainers, err
|
|
}
|
|
for _, container := range containers {
|
|
relevantContainers = append(relevantContainers, container.Labels[types.KubernetesContainerNameLabel])
|
|
}
|
|
return relevantContainers, nil
|
|
}
|
|
}
|
|
|
|
Context(fmt.Sprintf("Garbage Collection Test: %s", test.testName), func() {
|
|
BeforeEach(func() {
|
|
realPods := getPods(test.testPods)
|
|
f.PodClient().CreateBatch(realPods)
|
|
By("Making sure all containers restart the specified number of times")
|
|
Eventually(func() error {
|
|
for _, podSpec := range test.testPods {
|
|
err := verifyPodRestartCount(f, podSpec.podName, podSpec.numContainers, podSpec.restartCount)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}, setupDuration, runtimePollInterval).Should(BeNil())
|
|
})
|
|
|
|
It(fmt.Sprintf("Should eventually garbage collect containers when we exceed the number of dead containers per container"), func() {
|
|
totalContainers := 0
|
|
for _, pod := range test.testPods {
|
|
totalContainers += pod.numContainers*2 + 1
|
|
}
|
|
Eventually(func() error {
|
|
total := 0
|
|
for _, pod := range test.testPods {
|
|
containerNames, err := pod.getContainerNames()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
total += len(containerNames)
|
|
// Check maxPerPodContainer for each container in the pod
|
|
for i := 0; i < pod.numContainers; i++ {
|
|
containerCount := 0
|
|
for _, containerName := range containerNames {
|
|
if containerName == pod.getContainerName(i) {
|
|
containerCount += 1
|
|
}
|
|
}
|
|
if containerCount > maxPerPodContainer+1 {
|
|
return fmt.Errorf("expected number of copies of container: %s, to be <= maxPerPodContainer: %d; list of containers: %v",
|
|
pod.getContainerName(i), maxPerPodContainer, containerNames)
|
|
}
|
|
}
|
|
}
|
|
//Check maxTotalContainers. Currently, the default is -1, so this will never happen until we can configure maxTotalContainers
|
|
if maxTotalContainers > 0 && totalContainers <= maxTotalContainers && total > maxTotalContainers {
|
|
return fmt.Errorf("expected total number of containers: %v, to be <= maxTotalContainers: %v", total, maxTotalContainers)
|
|
}
|
|
return nil
|
|
}, garbageCollectDuration, runtimePollInterval).Should(BeNil())
|
|
|
|
if maxPerPodContainer >= 2 && maxTotalContainers < 0 { // make sure constraints wouldn't make us gc old containers
|
|
By("Making sure the kubelet consistently keeps around an extra copy of each container.")
|
|
Consistently(func() error {
|
|
for _, pod := range test.testPods {
|
|
containerNames, err := pod.getContainerNames()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for i := 0; i < pod.numContainers; i++ {
|
|
containerCount := 0
|
|
for _, containerName := range containerNames {
|
|
if containerName == pod.getContainerName(i) {
|
|
containerCount += 1
|
|
}
|
|
}
|
|
if pod.restartCount > 0 && containerCount < maxPerPodContainer+1 {
|
|
return fmt.Errorf("expected pod %v to have extra copies of old containers", pod.podName)
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}, garbageCollectDuration, runtimePollInterval).Should(BeNil())
|
|
}
|
|
})
|
|
|
|
AfterEach(func() {
|
|
for _, pod := range test.testPods {
|
|
By(fmt.Sprintf("Deleting Pod %v", pod.podName))
|
|
f.PodClient().DeleteSync(pod.podName, &metav1.DeleteOptions{}, framework.DefaultPodDeletionTimeout)
|
|
}
|
|
|
|
By("Making sure all containers get cleaned up")
|
|
Eventually(func() error {
|
|
for _, pod := range test.testPods {
|
|
containerNames, err := pod.getContainerNames()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(containerNames) > 0 {
|
|
return fmt.Errorf("%v containers still remain", containerNames)
|
|
}
|
|
}
|
|
return nil
|
|
}, garbageCollectDuration, runtimePollInterval).Should(BeNil())
|
|
|
|
if CurrentGinkgoTestDescription().Failed && framework.TestContext.DumpLogsOnFailure {
|
|
logNodeEvents(f)
|
|
logPodEvents(f)
|
|
}
|
|
})
|
|
})
|
|
}
|
|
|
|
func getPods(specs []*testPodSpec) (pods []*v1.Pod) {
|
|
for _, spec := range specs {
|
|
By(fmt.Sprintf("Creating %v containers with restartCount: %v", spec.numContainers, spec.restartCount))
|
|
containers := []v1.Container{}
|
|
for i := 0; i < spec.numContainers; i++ {
|
|
containers = append(containers, v1.Container{
|
|
Image: busyboxImage,
|
|
Name: spec.getContainerName(i),
|
|
Command: getRestartingContainerCommand("/test-empty-dir-mnt", i, spec.restartCount, ""),
|
|
VolumeMounts: []v1.VolumeMount{
|
|
{MountPath: "/test-empty-dir-mnt", Name: "test-empty-dir"},
|
|
},
|
|
})
|
|
}
|
|
pods = append(pods, &v1.Pod{
|
|
ObjectMeta: metav1.ObjectMeta{Name: spec.podName},
|
|
Spec: v1.PodSpec{
|
|
RestartPolicy: v1.RestartPolicyAlways,
|
|
Containers: containers,
|
|
Volumes: []v1.Volume{
|
|
{Name: "test-empty-dir", VolumeSource: v1.VolumeSource{EmptyDir: &v1.EmptyDirVolumeSource{}}},
|
|
},
|
|
},
|
|
})
|
|
}
|
|
return
|
|
}
|
|
|
|
func getRestartingContainerCommand(path string, containerNum int, restarts int32, loopingCommand string) []string {
|
|
return []string{
|
|
"sh",
|
|
"-c",
|
|
fmt.Sprintf(`
|
|
f=%s/countfile%s
|
|
count=$(echo 'hello' >> $f ; wc -l $f | awk {'print $1'})
|
|
if [ $count -lt %d ]; then
|
|
exit 0
|
|
fi
|
|
while true; do %s sleep 1; done`,
|
|
path, strconv.Itoa(containerNum), restarts+1, loopingCommand),
|
|
}
|
|
}
|
|
|
|
func verifyPodRestartCount(f *framework.Framework, podName string, expectedNumContainers int, expectedRestartCount int32) error {
|
|
updatedPod, err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Get(podName, metav1.GetOptions{})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(updatedPod.Status.ContainerStatuses) != expectedNumContainers {
|
|
return fmt.Errorf("expected pod %s to have %d containers, actual: %d",
|
|
updatedPod.Name, expectedNumContainers, len(updatedPod.Status.ContainerStatuses))
|
|
}
|
|
for _, containerStatus := range updatedPod.Status.ContainerStatuses {
|
|
if containerStatus.RestartCount != expectedRestartCount {
|
|
return fmt.Errorf("pod %s had container with restartcount %d. Should have been at least %d",
|
|
updatedPod.Name, containerStatus.RestartCount, expectedRestartCount)
|
|
}
|
|
}
|
|
return nil
|
|
}
|