Golang Client.Nodes方法代码示例

func CheckCadvisorHealthOnAllNodes(c *client.Client, timeout time.Duration) {
	By("getting list of nodes")
	nodeList, err := c.Nodes().List(labels.Everything(), fields.Everything())
	expectNoError(err)
	var errors []error
	retries := maxRetries
	for {
		errors = []error{}
		for _, node := range nodeList.Items {
			// cadvisor is not accessible directly unless its port (4194 by default) is exposed.
			// Here, we access '/stats/' REST endpoint on the kubelet which polls cadvisor internally.
			statsResource := fmt.Sprintf("api/v1/proxy/nodes/%s/stats/", node.Name)
			By(fmt.Sprintf("Querying stats from node %s using url %s", node.Name, statsResource))
			_, err = c.Get().AbsPath(statsResource).Timeout(timeout).Do().Raw()
			if err != nil {
				errors = append(errors, err)
			}
		}
		if len(errors) == 0 {
			return
		}
		if retries--; retries <= 0 {
			break
		}
		Logf("failed to retrieve kubelet stats -\n %v", errors)
		time.Sleep(sleepDuration)
	}
	Failf("Failed after retrying %d times for cadvisor to be healthy on all nodes. Errors:\n%v", maxRetries, errors)
}

func getAllNodesInCluster(c *client.Client) ([]string, error) {
	nodeList, err := c.Nodes().List(labels.Everything(), fields.Everything())
	if err != nil {
		return nil, err
	}
	result := []string{}
	for _, node := range nodeList.Items {
		result = append(result, node.Name)
	}
	return result, nil
}

func getMinionPublicIps(c *client.Client) ([]string, error) {
	nodes, err := c.Nodes().List(labels.Everything(), fields.Everything())
	if err != nil {
		return nil, err
	}

	ips := collectAddresses(nodes, api.NodeExternalIP)
	if len(ips) == 0 {
		ips = collectAddresses(nodes, api.NodeLegacyHostIP)
	}
	return ips, nil
}

func waitForNode(client *kclient.Client, t *testing.T) *kapi.NodeList {
	for i := 0; i < 25; i++ {
		time.Sleep(200 * time.Millisecond)
		nodeList, err := client.Nodes().List(labels.LabelSelector{}, fields.Everything())
		if err != nil {
			t.Fatalf("unexpected error fetching node list: %v", err)
		}
		if len(nodeList.Items) == 0 {
			continue
		}
		return nodeList
	}
	t.Fatal("Waited 5 seconds for all-in-one node to register itseld; giving up")
	return nil
}

func waitForClusterSize(c *client.Client, size int, timeout time.Duration) error {
	for start := time.Now(); time.Since(start) < timeout; time.Sleep(20 * time.Second) {
		nodes, err := c.Nodes().List(labels.Everything(), fields.Everything())
		if err != nil {
			Logf("Failed to list nodes: %v", err)
			continue
		}
		// Filter out not-ready nodes.
		filterNodes(nodes, func(node api.Node) bool {
			return isNodeReadySetAsExpected(&node, true)
		})

		if len(nodes.Items) == size {
			Logf("Cluster has reached the desired size %d", size)
			return nil
		}
		Logf("Waiting for cluster size %d, current size %d", size, len(nodes.Items))
	}
	return fmt.Errorf("timeout waiting %v for cluster size to be %d", timeout, size)
}

	return
}

// This tests does nothing except checking current resource usage of containers defained in kubelet_stats systemContainers variable.
// Test fails if an average container resource consumption over datapointAmount tries exceeds amount defined in allowedUsage.
var _ = Describe("ResourceUsage", func() {
	var c *client.Client
	BeforeEach(func() {
		var err error
		c, err = loadClient()
		expectNoError(err)
	})

	It("should not exceed expected amount.", func() {
		By("Getting ResourceConsumption on all nodes")
		nodeList, err := c.Nodes().List(labels.Everything(), fields.Everything())
		expectNoError(err)

		resourceUsagePerNode := make(map[string][]resourceUsagePerContainer)

		for i := 0; i < datapointAmount; i++ {
			for _, node := range nodeList.Items {
				resourceUsage, err := getOneTimeResourceUsageOnNode(c, node.Name, 5*time.Second)
				expectNoError(err)
				resourceUsagePerNode[node.Name] = append(resourceUsagePerNode[node.Name], resourceUsage)
			}
			time.Sleep(3 * time.Second)
		}

		averageResourceUsagePerNode := make(map[string]resourceUsagePerContainer)
		for _, node := range nodeList.Items {

				// Create a replication controller for a service that serves its hostname.
				// The source for the Docker container kubernetes/serve_hostname is in contrib/for-demos/serve_hostname
				name := "my-hostname-net"
				newSVCByName(c, ns, name)
				replicas := testContext.CloudConfig.NumNodes
				newRCByName(c, ns, name, replicas)
				err := verifyPods(c, ns, name, true, replicas)
				Expect(err).NotTo(HaveOccurred(), "Each pod should start running and responding")

				By("choose a node with at least one pod - we will block some network traffic on this node")
				label := labels.SelectorFromSet(labels.Set(map[string]string{"name": name}))
				pods, err := c.Pods(ns).List(label, fields.Everything()) // list pods after all have been scheduled
				Expect(err).NotTo(HaveOccurred())
				nodeName := pods.Items[0].Spec.NodeName

				node, err := c.Nodes().Get(nodeName)
				Expect(err).NotTo(HaveOccurred())

				By(fmt.Sprintf("block network traffic from node %s", node.Name))
				performTemporaryNetworkFailure(c, ns, name, replicas, pods.Items[0].Name, node)
				Logf("Waiting %v for node %s to be ready once temporary network failure ends", resizeNodeReadyTimeout, node.Name)
				if !waitForNodeToBe(c, node.Name, true, resizeNodeReadyTimeout) {
					Failf("Node %s did not become ready within %v", node.Name, resizeNodeReadyTimeout)
				}

				By("verify whether new pods can be created on the re-attached node")
				// increasing the RC size is not a valid way to test this
				// since we have no guarantees the pod will be scheduled on our node.
				additionalPod := "additionalpod"
				err = newPodOnNode(c, ns, additionalPod, node.Name)
				Expect(err).NotTo(HaveOccurred())

// the ginkgo.skip list (see driver.go).
// To run this suite you must explicitly ask for it by setting the
// -t/--test flag or ginkgo.focus flag.
var _ = Describe("Density", func() {
	var c *client.Client
	var minionCount int
	var RCName string
	var additionalPodsPrefix string
	var ns string
	var uuid string

	BeforeEach(func() {
		var err error
		c, err = loadClient()
		expectNoError(err)
		minions, err := c.Nodes().List(labels.Everything(), fields.Everything())
		expectNoError(err)
		minionCount = len(minions.Items)
		Expect(minionCount).NotTo(BeZero())

		// Terminating a namespace (deleting the remaining objects from it - which
		// generally means events) can affect the current run. Thus we wait for all
		// terminating namespace to be finally deleted before starting this test.
		err = deleteTestingNS(c)
		expectNoError(err)

		nsForTesting, err := createTestingNS("density", c)
		ns = nsForTesting.Name
		expectNoError(err)
		uuid = string(util.NewUUID())

func DoTestUnschedulableNodes(t *testing.T, restClient *client.Client, nodeStore cache.Store) {
	goodCondition := api.NodeCondition{
		Type:              api.NodeReady,
		Status:            api.ConditionTrue,
		Reason:            fmt.Sprintf("schedulable condition"),
		LastHeartbeatTime: util.Time{time.Now()},
	}
	badCondition := api.NodeCondition{
		Type:              api.NodeReady,
		Status:            api.ConditionUnknown,
		Reason:            fmt.Sprintf("unschedulable condition"),
		LastHeartbeatTime: util.Time{time.Now()},
	}
	// Create a new schedulable node, since we're first going to apply
	// the unschedulable condition and verify that pods aren't scheduled.
	node := &api.Node{
		ObjectMeta: api.ObjectMeta{Name: "node-scheduling-test-node"},
		Spec:       api.NodeSpec{Unschedulable: false},
		Status: api.NodeStatus{
			Capacity: api.ResourceList{
				api.ResourcePods: *resource.NewQuantity(32, resource.DecimalSI),
			},
			Conditions: []api.NodeCondition{goodCondition},
		},
	}
	nodeKey, err := cache.MetaNamespaceKeyFunc(node)
	if err != nil {
		t.Fatalf("Couldn't retrieve key for node %v", node.Name)
	}

	// The test does the following for each nodeStateManager in this list:
	//	1. Create a new node
	//	2. Apply the makeUnSchedulable function
	//	3. Create a new pod
	//  4. Check that the pod doesn't get assigned to the node
	//  5. Apply the schedulable function
	//  6. Check that the pod *does* get assigned to the node
	//  7. Delete the pod and node.

	nodeModifications := []nodeStateManager{
		// Test node.Spec.Unschedulable=true/false
		{
			makeUnSchedulable: func(t *testing.T, n *api.Node, s cache.Store, c *client.Client) {
				n.Spec.Unschedulable = true
				if _, err := c.Nodes().Update(n); err != nil {
					t.Fatalf("Failed to update node with unschedulable=true: %v", err)
				}
				err = waitForReflection(s, nodeKey, func(node interface{}) bool {
					// An unschedulable node should get deleted from the store
					return node == nil
				})
				if err != nil {
					t.Fatalf("Failed to observe reflected update for setting unschedulable=true: %v", err)
				}
			},
			makeSchedulable: func(t *testing.T, n *api.Node, s cache.Store, c *client.Client) {
				n.Spec.Unschedulable = false
				if _, err := c.Nodes().Update(n); err != nil {
					t.Fatalf("Failed to update node with unschedulable=false: %v", err)
				}
				err = waitForReflection(s, nodeKey, func(node interface{}) bool {
					return node != nil && node.(*api.Node).Spec.Unschedulable == false
				})
				if err != nil {
					t.Fatalf("Failed to observe reflected update for setting unschedulable=false: %v", err)
				}
			},
		},
		// Test node.Status.Conditions=ConditionTrue/Unknown
		{
			makeUnSchedulable: func(t *testing.T, n *api.Node, s cache.Store, c *client.Client) {
				n.Status = api.NodeStatus{
					Capacity: api.ResourceList{
						api.ResourcePods: *resource.NewQuantity(32, resource.DecimalSI),
					},
					Conditions: []api.NodeCondition{badCondition},
				}
				if _, err = c.Nodes().UpdateStatus(n); err != nil {
					t.Fatalf("Failed to update node with bad status condition: %v", err)
				}
				err = waitForReflection(s, nodeKey, func(node interface{}) bool {
					return node != nil && node.(*api.Node).Status.Conditions[0].Status == api.ConditionUnknown
				})
				if err != nil {
					t.Fatalf("Failed to observe reflected update for status condition update: %v", err)
				}
			},
			makeSchedulable: func(t *testing.T, n *api.Node, s cache.Store, c *client.Client) {
				n.Status = api.NodeStatus{
					Capacity: api.ResourceList{
						api.ResourcePods: *resource.NewQuantity(32, resource.DecimalSI),
					},
					Conditions: []api.NodeCondition{goodCondition},
				}
				if _, err = c.Nodes().UpdateStatus(n); err != nil {
					t.Fatalf("Failed to update node with healthy status condition: %v", err)
				}
				waitForReflection(s, nodeKey, func(node interface{}) bool {
					return node != nil && node.(*api.Node).Status.Conditions[0].Status == api.ConditionTrue
				})
//.........这里部分代码省略.........

// rebootNode takes node name on provider through the following steps using c:
//  - ensures the node is ready
//  - ensures all pods on the node are running and ready
//  - reboots the node (by executing rebootCmd over ssh)
//  - ensures the node reaches some non-ready state
//  - ensures the node becomes ready again
//  - ensures all pods on the node become running and ready again
//
// It returns true through result only if all of the steps pass; at the first
// failed step, it will return false through result and not run the rest.
func rebootNode(c *client.Client, provider, name, rebootCmd string, result chan bool) {
	// Setup
	ns := api.NamespaceSystem
	ps := newPodStore(c, ns, labels.Everything(), fields.OneTermEqualSelector(client.PodHost, name))
	defer ps.Stop()

	// Get the node initially.
	Logf("Getting %s", name)
	node, err := c.Nodes().Get(name)
	if err != nil {
		Logf("Couldn't get node %s", name)
		result <- false
		return
	}

	// Node sanity check: ensure it is "ready".
	if !waitForNodeToBeReady(c, name, nodeReadyInitialTimeout) {
		result <- false
		return
	}

	// Get all the pods on the node that don't have liveness probe set.
	// Liveness probe may cause restart of a pod during node reboot, and the pod may not be running.
	pods := ps.List()
	podNames := []string{}
	for _, p := range pods {
		probe := false
		for _, c := range p.Spec.Containers {
			if c.LivenessProbe != nil {
				probe = true
				break
			}
		}
		if !probe {
			podNames = append(podNames, p.ObjectMeta.Name)
		}
	}
	Logf("Node %s has %d pods: %v", name, len(podNames), podNames)

	// For each pod, we do a sanity check to ensure it's running / healthy
	// now, as that's what we'll be checking later.
	if !checkPodsRunningReady(c, ns, podNames, podReadyBeforeTimeout) {
		result <- false
		return
	}

	// Reboot the node.
	if err = issueSSHCommand(node, provider, rebootCmd); err != nil {
		Logf("Error while issuing ssh command: %v", err)
		result <- false
		return
	}

	// Wait for some kind of "not ready" status.
	if !waitForNodeToBeNotReady(c, name, rebootNodeNotReadyTimeout) {
		result <- false
		return
	}

	// Wait for some kind of "ready" status.
	if !waitForNodeToBeReady(c, name, rebootNodeReadyAgainTimeout) {
		result <- false
		return
	}

	// Ensure all of the pods that we found on this node before the reboot are
	// running / healthy.
	if !checkPodsRunningReady(c, ns, podNames, rebootPodReadyAgainTimeout) {
		result <- false
		return
	}

	Logf("Reboot successful on node %s", name)
	result <- true
}