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Merge pull request #95187 from twosigma/addingfailscenario
Adding failure scenario for long FQDN and setHostnameAsFQDN feature
This commit is contained in:
Kubernetes Prow Robot
GitHub
commit
eca53507be
@ -163,6 +163,7 @@ go_test(
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"//pkg/kubelet/cm/cpuset:go_default_library",
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"//pkg/kubelet/cm/topologymanager:go_default_library",
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"//pkg/kubelet/container:go_default_library",
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"//pkg/kubelet/events:go_default_library",
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"//pkg/kubelet/eviction:go_default_library",
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"//pkg/kubelet/eviction/api:go_default_library",
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"//pkg/kubelet/images:go_default_library",
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@ -201,6 +202,7 @@ go_test(
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"//staging/src/k8s.io/mount-utils:go_default_library",
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"//test/e2e/common:go_default_library",
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"//test/e2e/framework:go_default_library",
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"//test/e2e/framework/events:go_default_library",
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"//test/e2e/framework/gpu:go_default_library",
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"//test/e2e/framework/kubectl:go_default_library",
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"//test/e2e/framework/manifest:go_default_library",
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@ -24,10 +24,16 @@ import (
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"crypto/rand"
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"fmt"
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"math/big"
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"time"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/fields"
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"k8s.io/kubernetes/pkg/kubelet/events"
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"k8s.io/kubernetes/test/e2e/framework"
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e2eevents "k8s.io/kubernetes/test/e2e/framework/events"
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e2epod "k8s.io/kubernetes/test/e2e/framework/pod"
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imageutils "k8s.io/kubernetes/test/utils/image"
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"github.com/onsi/ginkgo"
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@ -41,8 +47,8 @@ func generatePodName(base string) string {
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return fmt.Sprintf("%s-%d", base, id)
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}
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func testPod() *v1.Pod {
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podName := generatePodName("hostfqdn")
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func testPod(podnamebase string) *v1.Pod {
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podName := generatePodName(podnamebase)
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pod := &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: podName,
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@ -65,6 +71,10 @@ func testPod() *v1.Pod {
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var _ = SIGDescribe("Hostname of Pod [Feature:SetHostnameAsFQDN][NodeAlphaFeature:SetHostnameAsFQDN]", func() {
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f := framework.NewDefaultFramework("hostfqdn")
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dnsDomain := "cluster.local"
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if cdn := framework.TestContext.ClusterDNSDomain; cdn != "" {
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dnsDomain = cdn
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}
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/*
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Release: v1.19
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@ -72,11 +82,11 @@ var _ = SIGDescribe("Hostname of Pod [Feature:SetHostnameAsFQDN][NodeAlphaFeatur
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Description: A Pod that does not define the subdomain field in it spec, does not have FQDN.
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*/
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ginkgo.It("a pod without subdomain field does not have FQDN", func() {
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pod := testPod()
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pod := testPod("hostfqdn")
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pod.Spec.Containers[0].Command = []string{"sh", "-c", "echo $(hostname)';'$(hostname -f)';'"}
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output := []string{fmt.Sprintf("%s;%s;", pod.ObjectMeta.Name, pod.ObjectMeta.Name)}
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// Create Pod
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f.TestContainerOutput("shotname only", pod, 0, output)
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f.TestContainerOutput("shortname only", pod, 0, output)
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})
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/*
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@ -86,14 +96,14 @@ var _ = SIGDescribe("Hostname of Pod [Feature:SetHostnameAsFQDN][NodeAlphaFeatur
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Hence, SetHostnameAsFQDN feature has no effect.
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*/
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ginkgo.It("a pod without FQDN is not affected by SetHostnameAsFQDN field", func() {
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pod := testPod()
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pod := testPod("hostfqdn")
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// Setting setHostnameAsFQDN field to true should have no effect.
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setHostnameAsFQDN := true
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pod.Spec.SetHostnameAsFQDN = &setHostnameAsFQDN
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pod.Spec.Containers[0].Command = []string{"sh", "-c", "echo $(hostname)';'$(hostname -f)';'"}
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output := []string{fmt.Sprintf("%s;%s;", pod.ObjectMeta.Name, pod.ObjectMeta.Name)}
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// Create Pod
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f.TestContainerOutput("shotname only", pod, 0, output)
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f.TestContainerOutput("shortname only", pod, 0, output)
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})
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/*
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@ -103,16 +113,16 @@ var _ = SIGDescribe("Hostname of Pod [Feature:SetHostnameAsFQDN][NodeAlphaFeatur
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hostname command returns shortname (pod name in this case), and hostname -f returns FQDN.
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*/
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ginkgo.It("a pod with subdomain field has FQDN, hostname is shortname", func() {
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pod := testPod()
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pod := testPod("hostfqdn")
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pod.Spec.Containers[0].Command = []string{"sh", "-c", "echo $(hostname)';'$(hostname -f)';'"}
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subdomain := "t"
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// Set PodSpec subdomain field to generate FQDN for pod
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pod.Spec.Subdomain = subdomain
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// Expected Pod FQDN
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hostFQDN := fmt.Sprintf("%s.%s.%s.svc.%s", pod.ObjectMeta.Name, subdomain, f.Namespace.Name, framework.TestContext.ClusterDNSDomain)
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hostFQDN := fmt.Sprintf("%s.%s.%s.svc.%s", pod.ObjectMeta.Name, subdomain, f.Namespace.Name, dnsDomain)
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output := []string{fmt.Sprintf("%s;%s;", pod.ObjectMeta.Name, hostFQDN)}
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// Create Pod
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f.TestContainerOutput("shotname and fqdn", pod, 0, output)
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f.TestContainerOutput("shortname and fqdn", pod, 0, output)
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})
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/*
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@ -122,7 +132,7 @@ var _ = SIGDescribe("Hostname of Pod [Feature:SetHostnameAsFQDN][NodeAlphaFeatur
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hostname is set to be the FQDN. In this case, both commands hostname and hostname -f return the FQDN of the Pod.
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*/
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ginkgo.It("a pod with subdomain field has FQDN, when setHostnameAsFQDN is set to true, the FQDN is set as hostname", func() {
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pod := testPod()
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pod := testPod("hostfqdn")
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pod.Spec.Containers[0].Command = []string{"sh", "-c", "echo $(hostname)';'$(hostname -f)';'"}
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subdomain := "t"
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// Set PodSpec subdomain field to generate FQDN for pod
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@ -131,7 +141,7 @@ var _ = SIGDescribe("Hostname of Pod [Feature:SetHostnameAsFQDN][NodeAlphaFeatur
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setHostnameAsFQDN := true
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pod.Spec.SetHostnameAsFQDN = &setHostnameAsFQDN
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// Expected Pod FQDN
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hostFQDN := fmt.Sprintf("%s.%s.%s.svc.%s", pod.ObjectMeta.Name, subdomain, f.Namespace.Name, framework.TestContext.ClusterDNSDomain)
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hostFQDN := fmt.Sprintf("%s.%s.%s.svc.%s", pod.ObjectMeta.Name, subdomain, f.Namespace.Name, dnsDomain)
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// Fail if FQDN is longer than 64 characters, otherwise the Pod will remain pending until test timeout.
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// In Linux, 64 characters is the limit of the hostname kernel field, which this test sets to the pod FQDN.
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framework.ExpectEqual(len(hostFQDN) < 65, true, fmt.Sprintf("The FQDN of the Pod cannot be longer than 64 characters, requested %s which is %d characters long.", hostFQDN, len(hostFQDN)))
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@ -140,4 +150,81 @@ var _ = SIGDescribe("Hostname of Pod [Feature:SetHostnameAsFQDN][NodeAlphaFeatur
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f.TestContainerOutput("fqdn and fqdn", pod, 0, output)
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})
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/*
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Release: v1.20
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Testname: Fail to Create Pod with longer than 64 bytes FQDN when setHostnameAsFQDN field set to true.
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Description: A Pod that defines the subdomain field in it spec has FQDN.
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When setHostnameAsFQDN: true, the hostname is set to be
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the FQDN. Since kernel limit is 64 bytes for hostname field,
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if pod FQDN is longer than 64 bytes it will generate events
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regarding FailedCreatePodSandBox.
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*/
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ginkgo.It("a pod configured to set FQDN as hostname will remain in Pending "+
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"state generating FailedCreatePodSandBox events when the FQDN is "+
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"longer than 64 bytes", func() {
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// 55 characters for name plus -<int>.t.svc.cluster.local is way more than 64 bytes
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pod := testPod("hostfqdnveryveryveryverylongforfqdntobemorethan64bytes")
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pod.Spec.Containers[0].Command = []string{"sh", "-c", "echo $(hostname)';'$(hostname -f)';'"}
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subdomain := "t"
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// Set PodSpec subdomain field to generate FQDN for pod
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pod.Spec.Subdomain = subdomain
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// Set PodSpec setHostnameAsFQDN to set FQDN as hostname
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setHostnameAsFQDN := true
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pod.Spec.SetHostnameAsFQDN = &setHostnameAsFQDN
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// Create Pod
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launchedPod := f.PodClient().Create(pod)
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// Ensure we delete pod
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defer f.PodClient().DeleteSync(launchedPod.Name, metav1.DeleteOptions{}, framework.DefaultPodDeletionTimeout)
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// Pod should remain in the pending state generating events with reason FailedCreatePodSandBox
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// Expected Message Error Event
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expectedMessage := "Failed to create pod sandbox: failed " +
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"to construct FQDN from pod hostname and cluster domain, FQDN "
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framework.Logf("Waiting for Pod to generate FailedCreatePodSandBox event.")
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// Wait for event with reason FailedCreatePodSandBox
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expectSandboxFailureEvent(f, launchedPod, expectedMessage)
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// Check Pod is in Pending Phase
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err := checkPodIsPending(f, launchedPod.ObjectMeta.Name, launchedPod.ObjectMeta.Namespace)
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framework.ExpectNoError(err)
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})
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})
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// expectSandboxFailureEvent polls for an event with reason "FailedCreatePodSandBox" containing the
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// expected message string.
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func expectSandboxFailureEvent(f *framework.Framework, pod *v1.Pod, msg string) {
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eventSelector := fields.Set{
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"involvedObject.kind": "Pod",
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"involvedObject.name": pod.Name,
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"involvedObject.namespace": f.Namespace.Name,
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"reason": events.FailedCreatePodSandBox,
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}.AsSelector().String()
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framework.ExpectNoError(e2eevents.WaitTimeoutForEvent(
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f.ClientSet, f.Namespace.Name, eventSelector, msg, framework.PodEventTimeout))
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}
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func checkPodIsPending(f *framework.Framework, podName, namespace string) error {
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c := f.ClientSet
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// we call this functoin after we saw event failing to create Pod, hence
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// pod has already been created and it should be in Pending status. Giving
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// 30 seconds to fetch the pod to avoid failing for transient issues getting
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// pods.
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fetchPodTimeout := 30 * time.Second
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return e2epod.WaitForPodCondition(c, namespace, podName, "Failed to Create Pod", fetchPodTimeout, func(pod *v1.Pod) (bool, error) {
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// We are looking for the pod to be scheduled and in Pending state
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if pod.Status.Phase == v1.PodPending {
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for _, cond := range pod.Status.Conditions {
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if cond.Type == v1.PodScheduled && cond.Status == v1.ConditionTrue {
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return true, nil
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}
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}
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}
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// If pod gets to this status, either FQDN is shorter than 64bytes
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// or setHostnameAsFQDN feature is not enable/in use.
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if pod.Status.Phase == v1.PodRunning || pod.Status.Phase == v1.PodSucceeded || pod.Status.Phase == v1.PodFailed {
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return true, fmt.Errorf("Expected pod %q in namespace %q to be in phase Pending, but got phase: %v", podName, namespace, pod.Status.Phase)
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}
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return false, nil
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})
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}
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