3eadd1a9ea
A number of race conditions exist when pods are terminated early in
their lifecycle because components in the kubelet need to know "no
running containers" or "containers can't be started from now on" but
were relying on outdated state.
Only the pod worker knows whether containers are being started for
a given pod, which is required to know when a pod is "terminated"
(no running containers, none coming). Move that responsibility and
podKiller function into the pod workers, and have everything that
was killing the pod go into the UpdatePod loop. Split syncPod into
three phases - setup, terminate containers, and cleanup pod - and
have transitions between those methods be visible to other
components. After this change, to kill a pod you tell the pod worker
to UpdatePod({UpdateType: SyncPodKill, Pod: pod}).
Several places in the kubelet were incorrect about whether they
were handling terminating (should stop running, might have
containers) or terminated (no running containers) pods. The pod worker
exposes methods that allow other loops to know when to set up or tear
down resources based on the state of the pod - these methods remove
the possibility of race conditions by ensuring a single component is
responsible for knowing each pod's allowed state and other components
simply delegate to checking whether they are in the window by UID.
Removing containers now no longer blocks final pod deletion in the
API server and are handled as background cleanup. Node shutdown
no longer marks pods as failed as they can be restarted in the
next step.
See https://docs.google.com/document/d/1Pic5TPntdJnYfIpBeZndDelM-AbS4FN9H2GTLFhoJ04/edit# for details
592 lines
17 KiB
Go
592 lines
17 KiB
Go
/*
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Copyright 2016 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 kubelet
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import (
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"fmt"
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"testing"
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"github.com/stretchr/testify/assert"
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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/runtime"
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"k8s.io/apimachinery/pkg/types"
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core "k8s.io/client-go/testing"
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"k8s.io/kubernetes/pkg/volume"
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volumetest "k8s.io/kubernetes/pkg/volume/testing"
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"k8s.io/kubernetes/pkg/volume/util"
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)
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func TestListVolumesForPod(t *testing.T) {
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testKubelet := newTestKubelet(t, false /* controllerAttachDetachEnabled */)
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defer testKubelet.Cleanup()
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kubelet := testKubelet.kubelet
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pod := podWithUIDNameNsSpec("12345678", "foo", "test", v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: "container1",
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VolumeMounts: []v1.VolumeMount{
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{
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Name: "vol1",
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MountPath: "/mnt/vol1",
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},
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{
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Name: "vol2",
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MountPath: "/mnt/vol2",
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},
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},
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},
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},
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Volumes: []v1.Volume{
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{
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Name: "vol1",
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VolumeSource: v1.VolumeSource{
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GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
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PDName: "fake-device1",
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},
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},
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},
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{
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Name: "vol2",
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VolumeSource: v1.VolumeSource{
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GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
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PDName: "fake-device2",
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},
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},
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},
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},
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})
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stopCh := runVolumeManager(kubelet)
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defer close(stopCh)
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kubelet.podManager.SetPods([]*v1.Pod{pod})
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err := kubelet.volumeManager.WaitForAttachAndMount(pod)
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assert.NoError(t, err)
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podName := util.GetUniquePodName(pod)
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volumesToReturn, volumeExsit := kubelet.ListVolumesForPod(types.UID(podName))
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assert.True(t, volumeExsit, "expected to find volumes for pod %q", podName)
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outerVolumeSpecName1 := "vol1"
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assert.NotNil(t, volumesToReturn[outerVolumeSpecName1], "key %s", outerVolumeSpecName1)
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outerVolumeSpecName2 := "vol2"
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assert.NotNil(t, volumesToReturn[outerVolumeSpecName2], "key %s", outerVolumeSpecName2)
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}
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func TestPodVolumesExist(t *testing.T) {
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testKubelet := newTestKubelet(t, false /* controllerAttachDetachEnabled */)
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defer testKubelet.Cleanup()
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kubelet := testKubelet.kubelet
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pods := []*v1.Pod{
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "pod1",
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UID: "pod1uid",
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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: "container1",
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VolumeMounts: []v1.VolumeMount{
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{
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Name: "vol1",
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MountPath: "/mnt/vol1",
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},
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},
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},
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},
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Volumes: []v1.Volume{
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{
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Name: "vol1",
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VolumeSource: v1.VolumeSource{
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GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
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PDName: "fake-device1",
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},
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},
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},
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},
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},
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},
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "pod2",
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UID: "pod2uid",
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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: "container2",
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VolumeMounts: []v1.VolumeMount{
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{
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Name: "vol2",
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MountPath: "/mnt/vol2",
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},
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},
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},
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},
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Volumes: []v1.Volume{
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{
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Name: "vol2",
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VolumeSource: v1.VolumeSource{
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GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
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PDName: "fake-device2",
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},
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},
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},
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},
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},
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},
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: "pod3",
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UID: "pod3uid",
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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: "container3",
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VolumeMounts: []v1.VolumeMount{
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{
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Name: "vol3",
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MountPath: "/mnt/vol3",
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},
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},
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},
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},
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Volumes: []v1.Volume{
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{
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Name: "vol3",
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VolumeSource: v1.VolumeSource{
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GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
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PDName: "fake-device3",
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},
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},
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},
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},
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},
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},
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}
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stopCh := runVolumeManager(kubelet)
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defer close(stopCh)
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kubelet.podManager.SetPods(pods)
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for _, pod := range pods {
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err := kubelet.volumeManager.WaitForAttachAndMount(pod)
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assert.NoError(t, err)
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}
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for _, pod := range pods {
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podVolumesExist := kubelet.podVolumesExist(pod.UID)
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assert.True(t, podVolumesExist, "pod %q", pod.UID)
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}
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}
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func TestVolumeAttachAndMountControllerDisabled(t *testing.T) {
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testKubelet := newTestKubelet(t, false /* controllerAttachDetachEnabled */)
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defer testKubelet.Cleanup()
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kubelet := testKubelet.kubelet
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pod := podWithUIDNameNsSpec("12345678", "foo", "test", v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: "container1",
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VolumeMounts: []v1.VolumeMount{
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{
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Name: "vol1",
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MountPath: "/mnt/vol1",
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},
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},
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},
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},
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Volumes: []v1.Volume{
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{
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Name: "vol1",
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VolumeSource: v1.VolumeSource{
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GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
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PDName: "fake-device",
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},
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},
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},
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},
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})
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stopCh := runVolumeManager(kubelet)
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defer close(stopCh)
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kubelet.podManager.SetPods([]*v1.Pod{pod})
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err := kubelet.volumeManager.WaitForAttachAndMount(pod)
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assert.NoError(t, err)
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podVolumes := kubelet.volumeManager.GetMountedVolumesForPod(
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util.GetUniquePodName(pod))
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expectedPodVolumes := []string{"vol1"}
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assert.Len(t, podVolumes, len(expectedPodVolumes), "Volumes for pod %+v", pod)
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for _, name := range expectedPodVolumes {
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assert.Contains(t, podVolumes, name, "Volumes for pod %+v", pod)
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}
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assert.True(t, testKubelet.volumePlugin.GetNewAttacherCallCount() >= 1, "Expected plugin NewAttacher to be called at least once")
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assert.NoError(t, volumetest.VerifyWaitForAttachCallCount(
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1 /* expectedWaitForAttachCallCount */, testKubelet.volumePlugin))
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assert.NoError(t, volumetest.VerifyAttachCallCount(
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1 /* expectedAttachCallCount */, testKubelet.volumePlugin))
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assert.NoError(t, volumetest.VerifyMountDeviceCallCount(
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1 /* expectedMountDeviceCallCount */, testKubelet.volumePlugin))
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assert.NoError(t, volumetest.VerifySetUpCallCount(
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1 /* expectedSetUpCallCount */, testKubelet.volumePlugin))
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}
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func TestVolumeUnmountAndDetachControllerDisabled(t *testing.T) {
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testKubelet := newTestKubelet(t, false /* controllerAttachDetachEnabled */)
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defer testKubelet.Cleanup()
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kubelet := testKubelet.kubelet
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pod := podWithUIDNameNsSpec("12345678", "foo", "test", v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: "container1",
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VolumeMounts: []v1.VolumeMount{
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{
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Name: "vol1",
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MountPath: "/mnt/vol1",
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},
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},
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},
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},
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Volumes: []v1.Volume{
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{
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Name: "vol1",
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VolumeSource: v1.VolumeSource{
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GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
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PDName: "fake-device",
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},
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},
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},
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},
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})
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stopCh := runVolumeManager(kubelet)
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defer close(stopCh)
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// Add pod
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kubelet.podManager.SetPods([]*v1.Pod{pod})
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// Verify volumes attached
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err := kubelet.volumeManager.WaitForAttachAndMount(pod)
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assert.NoError(t, err)
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podVolumes := kubelet.volumeManager.GetMountedVolumesForPod(
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util.GetUniquePodName(pod))
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expectedPodVolumes := []string{"vol1"}
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assert.Len(t, podVolumes, len(expectedPodVolumes), "Volumes for pod %+v", pod)
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for _, name := range expectedPodVolumes {
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assert.Contains(t, podVolumes, name, "Volumes for pod %+v", pod)
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}
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assert.True(t, testKubelet.volumePlugin.GetNewAttacherCallCount() >= 1, "Expected plugin NewAttacher to be called at least once")
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assert.NoError(t, volumetest.VerifyWaitForAttachCallCount(
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1 /* expectedWaitForAttachCallCount */, testKubelet.volumePlugin))
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assert.NoError(t, volumetest.VerifyAttachCallCount(
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1 /* expectedAttachCallCount */, testKubelet.volumePlugin))
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assert.NoError(t, volumetest.VerifyMountDeviceCallCount(
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1 /* expectedMountDeviceCallCount */, testKubelet.volumePlugin))
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assert.NoError(t, volumetest.VerifySetUpCallCount(
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1 /* expectedSetUpCallCount */, testKubelet.volumePlugin))
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// Remove pod
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// TODO: this may not be threadsafe (technically waitForVolumeUnmount)
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kubelet.podWorkers.(*fakePodWorkers).removeRuntime = map[types.UID]bool{pod.UID: true}
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kubelet.podManager.SetPods([]*v1.Pod{})
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assert.NoError(t, kubelet.volumeManager.WaitForUnmount(pod))
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if actual := kubelet.volumeManager.GetMountedVolumesForPod(util.GetUniquePodName(pod)); len(actual) > 0 {
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t.Fatalf("expected volume unmount to wait for no volumes: %v", actual)
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}
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// Verify volumes unmounted
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podVolumes = kubelet.volumeManager.GetMountedVolumesForPod(
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util.GetUniquePodName(pod))
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assert.Len(t, podVolumes, 0,
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"Expected volumes to be unmounted and detached. But some volumes are still mounted: %#v", podVolumes)
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assert.NoError(t, volumetest.VerifyTearDownCallCount(
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1 /* expectedTearDownCallCount */, testKubelet.volumePlugin))
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// Verify volumes detached and no longer reported as in use
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assert.NoError(t, waitForVolumeDetach(v1.UniqueVolumeName("fake/fake-device"), kubelet.volumeManager))
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assert.True(t, testKubelet.volumePlugin.GetNewAttacherCallCount() >= 1, "Expected plugin NewAttacher to be called at least once")
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assert.NoError(t, volumetest.VerifyDetachCallCount(
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1 /* expectedDetachCallCount */, testKubelet.volumePlugin))
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}
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func TestVolumeAttachAndMountControllerEnabled(t *testing.T) {
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testKubelet := newTestKubelet(t, true /* controllerAttachDetachEnabled */)
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defer testKubelet.Cleanup()
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kubelet := testKubelet.kubelet
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kubeClient := testKubelet.fakeKubeClient
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kubeClient.AddReactor("get", "nodes",
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func(action core.Action) (bool, runtime.Object, error) {
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return true, &v1.Node{
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ObjectMeta: metav1.ObjectMeta{Name: testKubeletHostname},
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Status: v1.NodeStatus{
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VolumesAttached: []v1.AttachedVolume{
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{
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Name: "fake/fake-device",
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DevicePath: "fake/path",
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},
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}},
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}, nil
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})
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kubeClient.AddReactor("*", "*", func(action core.Action) (bool, runtime.Object, error) {
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return true, nil, fmt.Errorf("no reaction implemented for %s", action)
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})
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pod := podWithUIDNameNsSpec("12345678", "foo", "test", v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: "container1",
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VolumeMounts: []v1.VolumeMount{
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{
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Name: "vol1",
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MountPath: "/mnt/vol1",
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},
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},
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},
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},
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Volumes: []v1.Volume{
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{
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Name: "vol1",
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VolumeSource: v1.VolumeSource{
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GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
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PDName: "fake-device",
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},
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},
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},
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},
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})
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stopCh := runVolumeManager(kubelet)
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defer close(stopCh)
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kubelet.podManager.SetPods([]*v1.Pod{pod})
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// Fake node status update
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go simulateVolumeInUseUpdate(
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v1.UniqueVolumeName("fake/fake-device"),
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stopCh,
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kubelet.volumeManager)
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assert.NoError(t, kubelet.volumeManager.WaitForAttachAndMount(pod))
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podVolumes := kubelet.volumeManager.GetMountedVolumesForPod(
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util.GetUniquePodName(pod))
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allPodVolumes := kubelet.volumeManager.GetPossiblyMountedVolumesForPod(
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util.GetUniquePodName(pod))
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assert.Equal(t, podVolumes, allPodVolumes, "GetMountedVolumesForPod and GetPossiblyMountedVolumesForPod should return the same volumes")
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expectedPodVolumes := []string{"vol1"}
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assert.Len(t, podVolumes, len(expectedPodVolumes), "Volumes for pod %+v", pod)
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for _, name := range expectedPodVolumes {
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assert.Contains(t, podVolumes, name, "Volumes for pod %+v", pod)
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}
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assert.True(t, testKubelet.volumePlugin.GetNewAttacherCallCount() >= 1, "Expected plugin NewAttacher to be called at least once")
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assert.NoError(t, volumetest.VerifyWaitForAttachCallCount(
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1 /* expectedWaitForAttachCallCount */, testKubelet.volumePlugin))
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assert.NoError(t, volumetest.VerifyZeroAttachCalls(testKubelet.volumePlugin))
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assert.NoError(t, volumetest.VerifyMountDeviceCallCount(
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1 /* expectedMountDeviceCallCount */, testKubelet.volumePlugin))
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assert.NoError(t, volumetest.VerifySetUpCallCount(
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1 /* expectedSetUpCallCount */, testKubelet.volumePlugin))
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}
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|
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func TestVolumeUnmountAndDetachControllerEnabled(t *testing.T) {
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testKubelet := newTestKubelet(t, true /* controllerAttachDetachEnabled */)
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defer testKubelet.Cleanup()
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kubelet := testKubelet.kubelet
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kubeClient := testKubelet.fakeKubeClient
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kubeClient.AddReactor("get", "nodes",
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func(action core.Action) (bool, runtime.Object, error) {
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return true, &v1.Node{
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ObjectMeta: metav1.ObjectMeta{Name: testKubeletHostname},
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Status: v1.NodeStatus{
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VolumesAttached: []v1.AttachedVolume{
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{
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Name: "fake/fake-device",
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DevicePath: "fake/path",
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},
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}},
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}, nil
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})
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kubeClient.AddReactor("*", "*", func(action core.Action) (bool, runtime.Object, error) {
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return true, nil, fmt.Errorf("no reaction implemented for %s", action)
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})
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|
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pod := podWithUIDNameNsSpec("12345678", "foo", "test", v1.PodSpec{
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Containers: []v1.Container{
|
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{
|
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Name: "container1",
|
|
VolumeMounts: []v1.VolumeMount{
|
|
{
|
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Name: "vol1",
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MountPath: "/mnt/vol1",
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},
|
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},
|
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},
|
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},
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|
Volumes: []v1.Volume{
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{
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Name: "vol1",
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VolumeSource: v1.VolumeSource{
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GCEPersistentDisk: &v1.GCEPersistentDiskVolumeSource{
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PDName: "fake-device",
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},
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},
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},
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},
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})
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|
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stopCh := runVolumeManager(kubelet)
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defer close(stopCh)
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|
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// Add pod
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kubelet.podManager.SetPods([]*v1.Pod{pod})
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|
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// Fake node status update
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go simulateVolumeInUseUpdate(
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v1.UniqueVolumeName("fake/fake-device"),
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stopCh,
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kubelet.volumeManager)
|
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|
|
// Verify volumes attached
|
|
assert.NoError(t, kubelet.volumeManager.WaitForAttachAndMount(pod))
|
|
|
|
podVolumes := kubelet.volumeManager.GetMountedVolumesForPod(
|
|
util.GetUniquePodName(pod))
|
|
allPodVolumes := kubelet.volumeManager.GetPossiblyMountedVolumesForPod(
|
|
util.GetUniquePodName(pod))
|
|
assert.Equal(t, podVolumes, allPodVolumes, "GetMountedVolumesForPod and GetPossiblyMountedVolumesForPod should return the same volumes")
|
|
|
|
expectedPodVolumes := []string{"vol1"}
|
|
assert.Len(t, podVolumes, len(expectedPodVolumes), "Volumes for pod %+v", pod)
|
|
for _, name := range expectedPodVolumes {
|
|
assert.Contains(t, podVolumes, name, "Volumes for pod %+v", pod)
|
|
}
|
|
|
|
assert.True(t, testKubelet.volumePlugin.GetNewAttacherCallCount() >= 1, "Expected plugin NewAttacher to be called at least once")
|
|
assert.NoError(t, volumetest.VerifyWaitForAttachCallCount(
|
|
1 /* expectedWaitForAttachCallCount */, testKubelet.volumePlugin))
|
|
assert.NoError(t, volumetest.VerifyZeroAttachCalls(testKubelet.volumePlugin))
|
|
assert.NoError(t, volumetest.VerifyMountDeviceCallCount(
|
|
1 /* expectedMountDeviceCallCount */, testKubelet.volumePlugin))
|
|
assert.NoError(t, volumetest.VerifySetUpCallCount(
|
|
1 /* expectedSetUpCallCount */, testKubelet.volumePlugin))
|
|
|
|
// Remove pod
|
|
kubelet.podWorkers.(*fakePodWorkers).removeRuntime = map[types.UID]bool{pod.UID: true}
|
|
kubelet.podManager.SetPods([]*v1.Pod{})
|
|
|
|
assert.NoError(t, waitForVolumeUnmount(kubelet.volumeManager, pod))
|
|
|
|
// Verify volumes unmounted
|
|
podVolumes = kubelet.volumeManager.GetMountedVolumesForPod(
|
|
util.GetUniquePodName(pod))
|
|
allPodVolumes = kubelet.volumeManager.GetPossiblyMountedVolumesForPod(
|
|
util.GetUniquePodName(pod))
|
|
assert.Equal(t, podVolumes, allPodVolumes, "GetMountedVolumesForPod and GetPossiblyMountedVolumesForPod should return the same volumes")
|
|
|
|
assert.Len(t, podVolumes, 0,
|
|
"Expected volumes to be unmounted and detached. But some volumes are still mounted: %#v", podVolumes)
|
|
|
|
assert.NoError(t, volumetest.VerifyTearDownCallCount(
|
|
1 /* expectedTearDownCallCount */, testKubelet.volumePlugin))
|
|
|
|
// Verify volumes detached and no longer reported as in use
|
|
assert.NoError(t, waitForVolumeDetach(v1.UniqueVolumeName("fake/fake-device"), kubelet.volumeManager))
|
|
assert.True(t, testKubelet.volumePlugin.GetNewAttacherCallCount() >= 1, "Expected plugin NewAttacher to be called at least once")
|
|
assert.NoError(t, volumetest.VerifyZeroDetachCallCount(testKubelet.volumePlugin))
|
|
}
|
|
|
|
type stubVolume struct {
|
|
path string
|
|
volume.MetricsNil
|
|
}
|
|
|
|
func (f *stubVolume) GetPath() string {
|
|
return f.path
|
|
}
|
|
|
|
func (f *stubVolume) GetAttributes() volume.Attributes {
|
|
return volume.Attributes{}
|
|
}
|
|
|
|
func (f *stubVolume) CanMount() error {
|
|
return nil
|
|
}
|
|
|
|
func (f *stubVolume) SetUp(mounterArgs volume.MounterArgs) error {
|
|
return nil
|
|
}
|
|
|
|
func (f *stubVolume) SetUpAt(dir string, mounterArgs volume.MounterArgs) error {
|
|
return nil
|
|
}
|
|
|
|
type stubBlockVolume struct {
|
|
dirPath string
|
|
volName string
|
|
}
|
|
|
|
func (f *stubBlockVolume) GetGlobalMapPath(spec *volume.Spec) (string, error) {
|
|
return "", nil
|
|
}
|
|
|
|
func (f *stubBlockVolume) GetPodDeviceMapPath() (string, string) {
|
|
return f.dirPath, f.volName
|
|
}
|
|
|
|
func (f *stubBlockVolume) SetUpDevice() (string, error) {
|
|
return "", nil
|
|
}
|
|
|
|
func (f stubBlockVolume) MapPodDevice() error {
|
|
return nil
|
|
}
|
|
|
|
func (f *stubBlockVolume) TearDownDevice(mapPath string, devicePath string) error {
|
|
return nil
|
|
}
|
|
|
|
func (f *stubBlockVolume) UnmapPodDevice() error {
|
|
return nil
|
|
}
|
|
|
|
func (f *stubBlockVolume) SupportsMetrics() bool {
|
|
return false
|
|
}
|
|
|
|
func (f *stubBlockVolume) GetMetrics() (*volume.Metrics, error) {
|
|
return nil, nil
|
|
}
|