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310 lines
10 KiB
Go
310 lines
10 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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 e2e
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import (
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"fmt"
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"reflect"
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"strings"
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"time"
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"k8s.io/kubernetes/pkg/api"
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apierrs "k8s.io/kubernetes/pkg/api/errors"
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"k8s.io/kubernetes/pkg/api/unversioned"
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"k8s.io/kubernetes/pkg/apimachinery/registered"
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"k8s.io/kubernetes/pkg/apis/extensions"
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client "k8s.io/kubernetes/pkg/client/unversioned"
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"k8s.io/kubernetes/pkg/kubectl"
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"k8s.io/kubernetes/pkg/labels"
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"k8s.io/kubernetes/pkg/runtime"
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"k8s.io/kubernetes/pkg/util/wait"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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const (
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// this should not be a multiple of 5, because node status updates
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// every 5 seconds. See https://github.com/kubernetes/kubernetes/pull/14915.
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dsRetryPeriod = 2 * time.Second
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dsRetryTimeout = 5 * time.Minute
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daemonsetLabelPrefix = "daemonset-"
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daemonsetNameLabel = daemonsetLabelPrefix + "name"
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daemonsetColorLabel = daemonsetLabelPrefix + "color"
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)
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// This test must be run in serial because it assumes the Daemon Set pods will
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// always get scheduled. If we run other tests in parallel, this may not
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// happen. In the future, running in parallel may work if we have an eviction
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// model which lets the DS controller kick out other pods to make room.
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// See http://issues.k8s.io/21767 for more details
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var _ = Describe("Daemon set [Serial]", func() {
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var f *Framework
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AfterEach(func() {
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if daemonsets, err := f.Client.DaemonSets(f.Namespace.Name).List(api.ListOptions{}); err == nil {
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Logf("daemonset: %s", runtime.EncodeOrDie(api.Codecs.LegacyCodec(registered.EnabledVersions()...), daemonsets))
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} else {
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Logf("unable to dump daemonsets: %v", err)
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}
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if pods, err := f.Client.Pods(f.Namespace.Name).List(api.ListOptions{}); err == nil {
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Logf("pods: %s", runtime.EncodeOrDie(api.Codecs.LegacyCodec(registered.EnabledVersions()...), pods))
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} else {
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Logf("unable to dump pods: %v", err)
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}
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err := clearDaemonSetNodeLabels(f.Client)
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Expect(err).NotTo(HaveOccurred())
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})
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f = NewDefaultFramework("daemonsets")
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image := "gcr.io/google_containers/serve_hostname:1.1"
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dsName := "daemon-set"
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var ns string
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var c *client.Client
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BeforeEach(func() {
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ns = f.Namespace.Name
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c = f.Client
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err := clearDaemonSetNodeLabels(c)
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Expect(err).NotTo(HaveOccurred())
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})
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It("should run and stop simple daemon", func() {
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label := map[string]string{daemonsetNameLabel: dsName}
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Logf("Creating simple daemon set %s", dsName)
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_, err := c.DaemonSets(ns).Create(&extensions.DaemonSet{
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ObjectMeta: api.ObjectMeta{
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Name: dsName,
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},
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Spec: extensions.DaemonSetSpec{
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Template: api.PodTemplateSpec{
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ObjectMeta: api.ObjectMeta{
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Labels: label,
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},
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Spec: api.PodSpec{
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Containers: []api.Container{
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{
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Name: dsName,
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Image: image,
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Ports: []api.ContainerPort{{ContainerPort: 9376}},
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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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Expect(err).NotTo(HaveOccurred())
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defer func() {
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Logf("Check that reaper kills all daemon pods for %s", dsName)
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dsReaper, err := kubectl.ReaperFor(extensions.Kind("DaemonSet"), c)
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Expect(err).NotTo(HaveOccurred())
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err = dsReaper.Stop(ns, dsName, 0, nil)
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Expect(err).NotTo(HaveOccurred())
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err = wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnNoNodes(f, label))
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Expect(err).NotTo(HaveOccurred(), "error waiting for daemon pod to be reaped")
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}()
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By("Check that daemon pods launch on every node of the cluster.")
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Expect(err).NotTo(HaveOccurred())
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err = wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnAllNodes(f, label))
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Expect(err).NotTo(HaveOccurred(), "error waiting for daemon pod to start")
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By("Stop a daemon pod, check that the daemon pod is revived.")
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podClient := c.Pods(ns)
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selector := labels.Set(label).AsSelector()
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options := api.ListOptions{LabelSelector: selector}
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podList, err := podClient.List(options)
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Expect(err).NotTo(HaveOccurred())
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Expect(len(podList.Items)).To(BeNumerically(">", 0))
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pod := podList.Items[0]
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err = podClient.Delete(pod.Name, nil)
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Expect(err).NotTo(HaveOccurred())
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err = wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnAllNodes(f, label))
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Expect(err).NotTo(HaveOccurred(), "error waiting for daemon pod to revive")
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})
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It("should run and stop complex daemon", func() {
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complexLabel := map[string]string{daemonsetNameLabel: dsName}
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nodeSelector := map[string]string{daemonsetColorLabel: "blue"}
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Logf("Creating daemon with a node selector %s", dsName)
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_, err := c.DaemonSets(ns).Create(&extensions.DaemonSet{
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ObjectMeta: api.ObjectMeta{
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Name: dsName,
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},
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Spec: extensions.DaemonSetSpec{
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Selector: &unversioned.LabelSelector{MatchLabels: complexLabel},
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Template: api.PodTemplateSpec{
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ObjectMeta: api.ObjectMeta{
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Labels: complexLabel,
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},
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Spec: api.PodSpec{
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NodeSelector: nodeSelector,
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Containers: []api.Container{
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{
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Name: dsName,
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Image: image,
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Ports: []api.ContainerPort{{ContainerPort: 9376}},
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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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Expect(err).NotTo(HaveOccurred())
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By("Initially, daemon pods should not be running on any nodes.")
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err = wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnNoNodes(f, complexLabel))
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Expect(err).NotTo(HaveOccurred(), "error waiting for daemon pods to be running on no nodes")
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By("Change label of node, check that daemon pod is launched.")
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nodeList := ListSchedulableNodesOrDie(f.Client)
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Expect(len(nodeList.Items)).To(BeNumerically(">", 0))
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newNode, err := setDaemonSetNodeLabels(c, nodeList.Items[0].Name, nodeSelector)
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Expect(err).NotTo(HaveOccurred(), "error setting labels on node")
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daemonSetLabels, _ := separateDaemonSetNodeLabels(newNode.Labels)
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Expect(len(daemonSetLabels)).To(Equal(1))
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err = wait.Poll(dsRetryPeriod, dsRetryTimeout, checkDaemonPodOnNodes(f, complexLabel, []string{newNode.Name}))
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Expect(err).NotTo(HaveOccurred(), "error waiting for daemon pods to be running on new nodes")
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By("remove the node selector and wait for daemons to be unscheduled")
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_, err = setDaemonSetNodeLabels(c, nodeList.Items[0].Name, map[string]string{})
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Expect(err).NotTo(HaveOccurred(), "error removing labels on node")
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Expect(wait.Poll(dsRetryPeriod, dsRetryTimeout, checkRunningOnNoNodes(f, complexLabel))).
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NotTo(HaveOccurred(), "error waiting for daemon pod to not be running on nodes")
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By("We should now be able to delete the daemon set.")
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Expect(c.DaemonSets(ns).Delete(dsName)).NotTo(HaveOccurred())
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})
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})
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func separateDaemonSetNodeLabels(labels map[string]string) (map[string]string, map[string]string) {
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daemonSetLabels := map[string]string{}
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otherLabels := map[string]string{}
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for k, v := range labels {
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if strings.HasPrefix(k, daemonsetLabelPrefix) {
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daemonSetLabels[k] = v
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} else {
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otherLabels[k] = v
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}
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}
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return daemonSetLabels, otherLabels
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}
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func clearDaemonSetNodeLabels(c *client.Client) error {
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nodeList := ListSchedulableNodesOrDie(c)
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for _, node := range nodeList.Items {
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_, err := setDaemonSetNodeLabels(c, node.Name, map[string]string{})
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if err != nil {
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return err
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}
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}
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return nil
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}
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func setDaemonSetNodeLabels(c *client.Client, nodeName string, labels map[string]string) (*api.Node, error) {
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nodeClient := c.Nodes()
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var newNode *api.Node
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var newLabels map[string]string
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err := wait.Poll(dsRetryPeriod, dsRetryTimeout, func() (bool, error) {
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node, err := nodeClient.Get(nodeName)
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if err != nil {
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return false, err
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}
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// remove all labels this test is creating
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daemonSetLabels, otherLabels := separateDaemonSetNodeLabels(node.Labels)
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if reflect.DeepEqual(daemonSetLabels, labels) {
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newNode = node
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return true, nil
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}
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node.Labels = otherLabels
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for k, v := range labels {
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node.Labels[k] = v
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}
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newNode, err = nodeClient.Update(node)
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if err == nil {
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newLabels, _ = separateDaemonSetNodeLabels(newNode.Labels)
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return true, err
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}
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if se, ok := err.(*apierrs.StatusError); ok && se.ErrStatus.Reason == unversioned.StatusReasonConflict {
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Logf("failed to update node due to resource version conflict")
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return false, nil
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}
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return false, err
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})
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if err != nil {
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return nil, err
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} else if len(newLabels) != len(labels) {
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return nil, fmt.Errorf("Could not set daemon set test labels as expected.")
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}
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return newNode, nil
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}
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func checkDaemonPodOnNodes(f *Framework, selector map[string]string, nodeNames []string) func() (bool, error) {
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return func() (bool, error) {
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selector := labels.Set(selector).AsSelector()
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options := api.ListOptions{LabelSelector: selector}
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podList, err := f.Client.Pods(f.Namespace.Name).List(options)
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if err != nil {
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return false, nil
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}
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pods := podList.Items
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nodesToPodCount := make(map[string]int)
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for _, pod := range pods {
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nodesToPodCount[pod.Spec.NodeName] += 1
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}
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Logf("nodesToPodCount: %#v", nodesToPodCount)
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// Ensure that exactly 1 pod is running on all nodes in nodeNames.
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for _, nodeName := range nodeNames {
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if nodesToPodCount[nodeName] != 1 {
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return false, nil
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}
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}
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// Ensure that sizes of the lists are the same. We've verified that every element of nodeNames is in
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// nodesToPodCount, so verifying the lengths are equal ensures that there aren't pods running on any
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// other nodes.
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return len(nodesToPodCount) == len(nodeNames), nil
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}
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}
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func checkRunningOnAllNodes(f *Framework, selector map[string]string) func() (bool, error) {
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return func() (bool, error) {
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nodeList, err := f.Client.Nodes().List(api.ListOptions{})
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expectNoError(err)
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nodeNames := make([]string, 0)
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for _, node := range nodeList.Items {
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nodeNames = append(nodeNames, node.Name)
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}
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return checkDaemonPodOnNodes(f, selector, nodeNames)()
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}
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}
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func checkRunningOnNoNodes(f *Framework, selector map[string]string) func() (bool, error) {
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return checkDaemonPodOnNodes(f, selector, make([]string, 0))
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}
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