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initializers.go
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initializers.go
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/*
Copyright 2017 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 extension
import (
"fmt"
"strings"
"time"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
"k8s.io/api/admissionregistration/v1alpha1"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
clientretry "k8s.io/kubernetes/pkg/client/retry"
"k8s.io/kubernetes/test/e2e/framework"
)
var _ = framework.KubeDescribe("Initializers", func() {
f := framework.NewDefaultFramework("initializers")
// TODO: Add failure traps once we have JustAfterEach
// See https://github.com/onsi/ginkgo/issues/303
It("should be invisible to controllers by default", func() {
ns := f.Namespace.Name
c := f.ClientSet
podName := "uninitialized-pod"
framework.Logf("Creating pod %s", podName)
ch := make(chan struct{})
go func() {
_, err := c.Core().Pods(ns).Create(newUninitializedPod(podName))
Expect(err).NotTo(HaveOccurred())
close(ch)
}()
// wait to ensure the scheduler does not act on an uninitialized pod
err := wait.PollImmediate(2*time.Second, 15*time.Second, func() (bool, error) {
p, err := c.Core().Pods(ns).Get(podName, metav1.GetOptions{})
if err != nil {
if errors.IsNotFound(err) {
return false, nil
}
return false, err
}
return len(p.Spec.NodeName) > 0, nil
})
Expect(err).To(Equal(wait.ErrWaitTimeout))
// verify that we can update an initializing pod
pod, err := c.Core().Pods(ns).Get(podName, metav1.GetOptions{})
Expect(err).NotTo(HaveOccurred())
pod.Annotations = map[string]string{"update-1": "test"}
pod, err = c.Core().Pods(ns).Update(pod)
Expect(err).NotTo(HaveOccurred())
// verify the list call filters out uninitialized pods
pods, err := c.Core().Pods(ns).List(metav1.ListOptions{IncludeUninitialized: true})
Expect(err).NotTo(HaveOccurred())
Expect(pods.Items).To(HaveLen(1))
pods, err = c.Core().Pods(ns).List(metav1.ListOptions{})
Expect(err).NotTo(HaveOccurred())
Expect(pods.Items).To(HaveLen(0))
// clear initializers
pod.Initializers = nil
pod, err = c.Core().Pods(ns).Update(pod)
Expect(err).NotTo(HaveOccurred())
// pod should now start running
err = framework.WaitForPodRunningInNamespace(c, pod)
Expect(err).NotTo(HaveOccurred())
// ensure create call returns
<-ch
// verify that we cannot start the pod initializing again
pod, err = c.Core().Pods(ns).Get(podName, metav1.GetOptions{})
Expect(err).NotTo(HaveOccurred())
pod.Initializers = &metav1.Initializers{
Pending: []metav1.Initializer{{Name: "Other"}},
}
_, err = c.Core().Pods(ns).Update(pod)
if !errors.IsInvalid(err) || !strings.Contains(err.Error(), "immutable") {
Fail(fmt.Sprintf("expected invalid error: %v", err))
}
})
It("should dynamically register and apply initializers to pods [Serial]", func() {
ns := f.Namespace.Name
c := f.ClientSet
podName := "uninitialized-pod"
framework.Logf("Creating pod %s", podName)
// create and register an initializer
initializerName := "pod.test.e2e.kubernetes.io"
initializerConfigName := "e2e-test-initializer"
_, err := c.AdmissionregistrationV1alpha1().InitializerConfigurations().Create(&v1alpha1.InitializerConfiguration{
ObjectMeta: metav1.ObjectMeta{Name: initializerConfigName},
Initializers: []v1alpha1.Initializer{
{
Name: initializerName,
Rules: []v1alpha1.Rule{
{APIGroups: []string{""}, APIVersions: []string{"*"}, Resources: []string{"pods"}},
},
},
},
})
if errors.IsNotFound(err) {
framework.Skipf("dynamic configuration of initializers requires the alpha admissionregistration.k8s.io group to be enabled")
}
Expect(err).NotTo(HaveOccurred())
// we must remove the initializer when the test is complete and ensure no pods are pending for that initializer
defer func() {
if err := c.AdmissionregistrationV1alpha1().InitializerConfigurations().Delete(initializerConfigName, nil); err != nil && !errors.IsNotFound(err) {
framework.Logf("got error on deleting %s", initializerConfigName)
}
// poller configuration is 1 second, wait at least that long
time.Sleep(3 * time.Second)
// clear our initializer from anyone who got it
removeInitializersFromAllPods(c, initializerName)
}()
// poller configuration is 1 second, wait at least that long
time.Sleep(3 * time.Second)
// run create that blocks
ch := make(chan struct{})
go func() {
defer close(ch)
_, err := c.Core().Pods(ns).Create(newPod(podName))
Expect(err).NotTo(HaveOccurred())
}()
// wait until the pod shows up uninitialized
By("Waiting until the pod is visible to a client")
var pod *v1.Pod
err = wait.PollImmediate(2*time.Second, 15*time.Second, func() (bool, error) {
pod, err = c.Core().Pods(ns).Get(podName, metav1.GetOptions{IncludeUninitialized: true})
if errors.IsNotFound(err) {
return false, nil
}
if err != nil {
return false, err
}
return true, nil
})
Expect(err).NotTo(HaveOccurred())
Expect(pod.Initializers).NotTo(BeNil())
Expect(pod.Initializers.Pending).To(HaveLen(1))
Expect(pod.Initializers.Pending[0].Name).To(Equal(initializerName))
// pretend we are an initializer
By("Completing initialization")
pod.Initializers = nil
pod, err = c.Core().Pods(ns).Update(pod)
Expect(err).NotTo(HaveOccurred())
// ensure create call returns
<-ch
// pod should now start running
err = framework.WaitForPodRunningInNamespace(c, pod)
Expect(err).NotTo(HaveOccurred())
// bypass initialization by explicitly passing an empty pending list
By("Setting an empty initializer as an admin to bypass initialization")
podName = "preinitialized-pod"
pod = newUninitializedPod(podName)
pod.Initializers.Pending = nil
pod, err = c.Core().Pods(ns).Create(pod)
Expect(err).NotTo(HaveOccurred())
Expect(pod.Initializers).To(BeNil())
// bypass initialization for mirror pods
By("Creating a mirror pod that bypasses initialization")
podName = "mirror-pod"
pod = newPod(podName)
pod.Annotations = map[string]string{
v1.MirrorPodAnnotationKey: "true",
}
pod.Spec.NodeName = "node-does-not-yet-exist"
pod, err = c.Core().Pods(ns).Create(pod)
Expect(err).NotTo(HaveOccurred())
Expect(pod.Initializers).To(BeNil())
Expect(pod.Annotations[v1.MirrorPodAnnotationKey]).To(Equal("true"))
})
})
func newUninitializedPod(podName string) *v1.Pod {
pod := newPod(podName)
pod.Initializers = &metav1.Initializers{
Pending: []metav1.Initializer{{Name: "Test"}},
}
return pod
}
func newPod(podName string) *v1.Pod {
containerName := fmt.Sprintf("%s-container", podName)
port := 8080
pod := &v1.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: podName,
},
Spec: v1.PodSpec{
Containers: []v1.Container{
{
Name: containerName,
Image: "gcr.io/google_containers/porter:4524579c0eb935c056c8e75563b4e1eda31587e0",
Env: []v1.EnvVar{{Name: fmt.Sprintf("SERVE_PORT_%d", port), Value: "foo"}},
Ports: []v1.ContainerPort{{ContainerPort: int32(port)}},
},
},
RestartPolicy: v1.RestartPolicyNever,
},
}
return pod
}
// removeInitializersFromAllPods walks all pods and ensures they don't have the provided initializer,
// to guarantee completing the test doesn't block the entire cluster.
func removeInitializersFromAllPods(c clientset.Interface, initializerName string) {
pods, err := c.Core().Pods("").List(metav1.ListOptions{IncludeUninitialized: true})
if err != nil {
return
}
for _, p := range pods.Items {
if p.Initializers == nil {
continue
}
err := clientretry.RetryOnConflict(clientretry.DefaultRetry, func() error {
pod, err := c.Core().Pods(p.Namespace).Get(p.Name, metav1.GetOptions{IncludeUninitialized: true})
if err != nil {
if errors.IsNotFound(err) {
return nil
}
return err
}
if pod.Initializers == nil {
return nil
}
var updated []metav1.Initializer
for _, pending := range pod.Initializers.Pending {
if pending.Name != initializerName {
updated = append(updated, pending)
}
}
if len(updated) == len(pod.Initializers.Pending) {
return nil
}
pod.Initializers.Pending = updated
if len(updated) == 0 {
pod.Initializers = nil
}
framework.Logf("Found initializer on pod %s in ns %s", pod.Name, pod.Namespace)
_, err = c.Core().Pods(p.Namespace).Update(pod)
return err
})
if err != nil {
framework.Logf("Unable to remove initializer from pod %s in ns %s: %v", p.Name, p.Namespace, err)
}
}
}