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rc.go 11.29 KB
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/*
Copyright 2015 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 apps
import (
"fmt"
"time"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/util/uuid"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/kubernetes/pkg/controller/replication"
"k8s.io/kubernetes/test/e2e/framework"
imageutils "k8s.io/kubernetes/test/utils/image"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = SIGDescribe("ReplicationController", func() {
f := framework.NewDefaultFramework("replication-controller")
framework.ConformanceIt("should serve a basic image on each replica with a public image ", func() {
TestReplicationControllerServeImageOrFail(f, "basic", framework.ServeHostnameImage)
})
It("should serve a basic image on each replica with a private image", func() {
// requires private images
framework.SkipUnlessProviderIs("gce", "gke")
privateimage := imageutils.ServeHostname
privateimage.SetRegistry(imageutils.PrivateRegistry)
TestReplicationControllerServeImageOrFail(f, "private", imageutils.GetE2EImage(privateimage))
})
It("should surface a failure condition on a common issue like exceeded quota", func() {
testReplicationControllerConditionCheck(f)
})
It("should adopt matching pods on creation", func() {
testRCAdoptMatchingOrphans(f)
})
It("should release no longer matching pods", func() {
testRCReleaseControlledNotMatching(f)
})
})
func newRC(rsName string, replicas int32, rcPodLabels map[string]string, imageName string, image string) *v1.ReplicationController {
zero := int64(0)
return &v1.ReplicationController{
ObjectMeta: metav1.ObjectMeta{
Name: rsName,
},
Spec: v1.ReplicationControllerSpec{
Replicas: func(i int32) *int32 { return &i }(replicas),
Template: &v1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: rcPodLabels,
},
Spec: v1.PodSpec{
TerminationGracePeriodSeconds: &zero,
Containers: []v1.Container{
{
Name: imageName,
Image: image,
},
},
},
},
},
}
}
// A basic test to check the deployment of an image using
// a replication controller. The image serves its hostname
// which is checked for each replica.
func TestReplicationControllerServeImageOrFail(f *framework.Framework, test string, image string) {
name := "my-hostname-" + test + "-" + string(uuid.NewUUID())
replicas := int32(1)
// Create a replication controller for a service
// that serves its hostname.
// The source for the Docker containter kubernetes/serve_hostname is
// in contrib/for-demos/serve_hostname
By(fmt.Sprintf("Creating replication controller %s", name))
newRC := newRC(name, replicas, map[string]string{"name": name}, name, image)
newRC.Spec.Template.Spec.Containers[0].Ports = []v1.ContainerPort{{ContainerPort: 9376}}
_, err := f.ClientSet.CoreV1().ReplicationControllers(f.Namespace.Name).Create(newRC)
Expect(err).NotTo(HaveOccurred())
// Check that pods for the new RC were created.
// TODO: Maybe switch PodsCreated to just check owner references.
pods, err := framework.PodsCreated(f.ClientSet, f.Namespace.Name, name, replicas)
Expect(err).NotTo(HaveOccurred())
// Wait for the pods to enter the running state. Waiting loops until the pods
// are running so non-running pods cause a timeout for this test.
framework.Logf("Ensuring all pods for ReplicationController %q are running", name)
running := int32(0)
for _, pod := range pods.Items {
if pod.DeletionTimestamp != nil {
continue
}
err = f.WaitForPodRunning(pod.Name)
if err != nil {
updatePod, getErr := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Get(pod.Name, metav1.GetOptions{})
if getErr == nil {
err = fmt.Errorf("Pod %q never run (phase: %s, conditions: %+v): %v", updatePod.Name, updatePod.Status.Phase, updatePod.Status.Conditions, err)
} else {
err = fmt.Errorf("Pod %q never run: %v", pod.Name, err)
}
}
Expect(err).NotTo(HaveOccurred())
framework.Logf("Pod %q is running (conditions: %+v)", pod.Name, pod.Status.Conditions)
running++
}
// Sanity check
if running != replicas {
Expect(fmt.Errorf("unexpected number of running pods: %+v", pods.Items)).NotTo(HaveOccurred())
}
// Verify that something is listening.
framework.Logf("Trying to dial the pod")
retryTimeout := 2 * time.Minute
retryInterval := 5 * time.Second
label := labels.SelectorFromSet(labels.Set(map[string]string{"name": name}))
err = wait.Poll(retryInterval, retryTimeout, framework.PodProxyResponseChecker(f.ClientSet, f.Namespace.Name, label, name, true, pods).CheckAllResponses)
if err != nil {
framework.Failf("Did not get expected responses within the timeout period of %.2f seconds.", retryTimeout.Seconds())
}
}
// 1. Create a quota restricting pods in the current namespace to 2.
// 2. Create a replication controller that wants to run 3 pods.
// 3. Check replication controller conditions for a ReplicaFailure condition.
// 4. Relax quota or scale down the controller and observe the condition is gone.
func testReplicationControllerConditionCheck(f *framework.Framework) {
c := f.ClientSet
namespace := f.Namespace.Name
name := "condition-test"
framework.Logf("Creating quota %q that allows only two pods to run in the current namespace", name)
quota := newPodQuota(name, "2")
_, err := c.CoreV1().ResourceQuotas(namespace).Create(quota)
Expect(err).NotTo(HaveOccurred())
err = wait.PollImmediate(1*time.Second, 1*time.Minute, func() (bool, error) {
quota, err = c.CoreV1().ResourceQuotas(namespace).Get(name, metav1.GetOptions{})
if err != nil {
return false, err
}
podQuota := quota.Status.Hard[v1.ResourcePods]
quantity := resource.MustParse("2")
return (&podQuota).Cmp(quantity) == 0, nil
})
if err == wait.ErrWaitTimeout {
err = fmt.Errorf("resource quota %q never synced", name)
}
Expect(err).NotTo(HaveOccurred())
By(fmt.Sprintf("Creating rc %q that asks for more than the allowed pod quota", name))
rc := newRC(name, 3, map[string]string{"name": name}, NginxImageName, NginxImage)
rc, err = c.CoreV1().ReplicationControllers(namespace).Create(rc)
Expect(err).NotTo(HaveOccurred())
By(fmt.Sprintf("Checking rc %q has the desired failure condition set", name))
generation := rc.Generation
conditions := rc.Status.Conditions
err = wait.PollImmediate(1*time.Second, 1*time.Minute, func() (bool, error) {
rc, err = c.CoreV1().ReplicationControllers(namespace).Get(name, metav1.GetOptions{})
if err != nil {
return false, err
}
if generation > rc.Status.ObservedGeneration {
return false, nil
}
conditions = rc.Status.Conditions
cond := replication.GetCondition(rc.Status, v1.ReplicationControllerReplicaFailure)
return cond != nil, nil
})
if err == wait.ErrWaitTimeout {
err = fmt.Errorf("rc manager never added the failure condition for rc %q: %#v", name, conditions)
}
Expect(err).NotTo(HaveOccurred())
By(fmt.Sprintf("Scaling down rc %q to satisfy pod quota", name))
rc, err = framework.UpdateReplicationControllerWithRetries(c, namespace, name, func(update *v1.ReplicationController) {
x := int32(2)
update.Spec.Replicas = &x
})
Expect(err).NotTo(HaveOccurred())
By(fmt.Sprintf("Checking rc %q has no failure condition set", name))
generation = rc.Generation
conditions = rc.Status.Conditions
err = wait.PollImmediate(1*time.Second, 1*time.Minute, func() (bool, error) {
rc, err = c.CoreV1().ReplicationControllers(namespace).Get(name, metav1.GetOptions{})
if err != nil {
return false, err
}
if generation > rc.Status.ObservedGeneration {
return false, nil
}
conditions = rc.Status.Conditions
cond := replication.GetCondition(rc.Status, v1.ReplicationControllerReplicaFailure)
return cond == nil, nil
})
if err == wait.ErrWaitTimeout {
err = fmt.Errorf("rc manager never removed the failure condition for rc %q: %#v", name, conditions)
}
Expect(err).NotTo(HaveOccurred())
}
func testRCAdoptMatchingOrphans(f *framework.Framework) {
name := "pod-adoption"
By(fmt.Sprintf("Given a Pod with a 'name' label %s is created", name))
p := f.PodClient().CreateSync(&v1.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Labels: map[string]string{
"name": name,
},
},
Spec: v1.PodSpec{
Containers: []v1.Container{
{
Name: name,
Image: NginxImageName,
},
},
},
})
By("When a replication controller with a matching selector is created")
replicas := int32(1)
rcSt := newRC(name, replicas, map[string]string{"name": name}, name, NginxImageName)
rcSt.Spec.Selector = map[string]string{"name": name}
rc, err := f.ClientSet.CoreV1().ReplicationControllers(f.Namespace.Name).Create(rcSt)
Expect(err).NotTo(HaveOccurred())
By("Then the orphan pod is adopted")
err = wait.PollImmediate(1*time.Second, 1*time.Minute, func() (bool, error) {
p2, err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Get(p.Name, metav1.GetOptions{})
// The Pod p should either be adopted or deleted by the RC
if errors.IsNotFound(err) {
return true, nil
}
Expect(err).NotTo(HaveOccurred())
for _, owner := range p2.OwnerReferences {
if *owner.Controller && owner.UID == rc.UID {
// pod adopted
return true, nil
}
}
// pod still not adopted
return false, nil
})
Expect(err).NotTo(HaveOccurred())
}
func testRCReleaseControlledNotMatching(f *framework.Framework) {
name := "pod-release"
By("Given a ReplicationController is created")
replicas := int32(1)
rcSt := newRC(name, replicas, map[string]string{"name": name}, name, NginxImageName)
rcSt.Spec.Selector = map[string]string{"name": name}
rc, err := f.ClientSet.CoreV1().ReplicationControllers(f.Namespace.Name).Create(rcSt)
Expect(err).NotTo(HaveOccurred())
By("When the matched label of one of its pods change")
pods, err := framework.PodsCreated(f.ClientSet, f.Namespace.Name, rc.Name, replicas)
Expect(err).NotTo(HaveOccurred())
p := pods.Items[0]
err = wait.PollImmediate(1*time.Second, 1*time.Minute, func() (bool, error) {
pod, err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Get(p.Name, metav1.GetOptions{})
Expect(err).NotTo(HaveOccurred())
pod.Labels = map[string]string{"name": "not-matching-name"}
_, err = f.ClientSet.CoreV1().Pods(f.Namespace.Name).Update(pod)
if err != nil && errors.IsConflict(err) {
return false, nil
}
if err != nil {
return false, err
}
return true, nil
})
Expect(err).NotTo(HaveOccurred())
By("Then the pod is released")
err = wait.PollImmediate(1*time.Second, 1*time.Minute, func() (bool, error) {
p2, err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Get(p.Name, metav1.GetOptions{})
Expect(err).NotTo(HaveOccurred())
for _, owner := range p2.OwnerReferences {
if *owner.Controller && owner.UID == rc.UID {
// pod still belonging to the replication controller
return false, nil
}
}
// pod already released
return true, nil
})
Expect(err).NotTo(HaveOccurred())
}
Go
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https://gitee.com/meoom/kubernetes.git
git@gitee.com:meoom/kubernetes.git
meoom
kubernetes
kubernetes
v1.9.4

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