Golang Clientset.Nodes方法代码示例

func attemptToUpdateMasterRoleLabelsAndTaints(client *clientset.Clientset, schedulable bool) error {
	n, err := findMyself(client)
	if err != nil {
		return err
	}

	n.ObjectMeta.Labels["kubeadm.alpha.kubernetes.io/role"] = "master"

	if !schedulable {
		taintsAnnotation, _ := json.Marshal([]api.Taint{{Key: "dedicated", Value: "master", Effect: "NoSchedule"}})
		n.ObjectMeta.Annotations[api.TaintsAnnotationKey] = string(taintsAnnotation)
	}

	if _, err := client.Nodes().Update(n); err != nil {
		if apierrs.IsConflict(err) {
			fmt.Println("<master/apiclient> temporarily unable to update master node metadata due to conflict (will retry)")
			time.Sleep(apiCallRetryInterval)
			attemptToUpdateMasterRoleLabelsAndTaints(client, schedulable)
		} else {
			return err
		}
	}

	return nil
}

// Update updates an existing node api object
// by looking up the given hostname.
// The updated node merges the given slave attribute labels
// and annotations with the found api object.
func Update(
	client *clientset.Clientset,
	hostname string,
	slaveAttrLabels,
	annotations map[string]string,
) (n *api.Node, err error) {
	for i := 0; i < clientRetryCount; i++ {
		n, err = client.Nodes().Get(hostname)
		if err != nil {
			return nil, fmt.Errorf("error getting node %q: %v", hostname, err)
		}
		if n == nil {
			return nil, fmt.Errorf("no node instance returned for %q", hostname)
		}

		// update labels derived from Mesos slave attributes, keep all other labels
		n.Labels = mergeMaps(
			filterMap(n.Labels, IsNotSlaveAttributeLabel),
			slaveAttrLabels,
		)
		n.Annotations = mergeMaps(n.Annotations, annotations)

		n, err = client.Nodes().Update(n)
		if err == nil && !errors.IsConflict(err) {
			return n, nil
		}

		log.Infof("retry %d/%d: error updating node %v err %v", i, clientRetryCount, n, err)
		time.Sleep(time.Duration(i) * clientRetryInterval)
	}

	return nil, err
}

// It's safe to do this for alpha, as we don't have HA and there is no way we can get
// more then one node here (TODO(phase1+) use os.Hostname)
func findMyself(client *clientset.Clientset) (*api.Node, error) {
	nodeList, err := client.Nodes().List(api.ListOptions{})
	if err != nil {
		return nil, fmt.Errorf("unable to list nodes [%v]", err)
	}
	if len(nodeList.Items) < 1 {
		return nil, fmt.Errorf("no nodes found")
	}
	node := &nodeList.Items[0]
	return node, nil
}

// getNode gets node object from the apiserver.
func getNode(c *clientset.Clientset) (*api.Node, error) {
	nodes, err := c.Nodes().List(api.ListOptions{})
	Expect(err).NotTo(HaveOccurred(), "should be able to list nodes.")
	if nodes == nil {
		return nil, fmt.Errorf("the node list is nil.")
	}
	Expect(len(nodes.Items) > 1).NotTo(BeTrue(), "should not be more than 1 nodes.")
	if len(nodes.Items) == 0 {
		return nil, fmt.Errorf("empty node list: %+v", nodes)
	}
	return &nodes.Items[0], nil
}

// Create creates a new node api object with the given hostname,
// slave attribute labels and annotations
func Create(
	client *clientset.Clientset,
	hostName string,
	slaveAttrLabels,
	annotations map[string]string,
) (*api.Node, error) {
	n := api.Node{
		ObjectMeta: api.ObjectMeta{
			Name: hostName,
		},
		Spec: api.NodeSpec{
			ExternalID: hostName,
		},
		Status: api.NodeStatus{
			Phase: api.NodePending,
			// WORKAROUND(sttts): make sure that the Ready condition is the
			// first one. The kube-ui v3 depends on this assumption.
			// TODO(sttts): remove this workaround when kube-ui v4 is used or we
			//              merge this with the statusupdate in the controller manager.
			Conditions: []api.NodeCondition{
				{
					Type:              api.NodeReady,
					Status:            api.ConditionTrue,
					Reason:            slaveReadyReason,
					Message:           slaveReadyMessage,
					LastHeartbeatTime: unversioned.Now(),
				},
			},
		},
	}

	n.Labels = mergeMaps(
		map[string]string{"kubernetes.io/hostname": hostName},
		slaveAttrLabels,
	)

	n.Annotations = annotations

	// try to create
	return client.Nodes().Create(&n)
}