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kube.go
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kube.go
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// Copyright 2016 flannel 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 kube
import (
"encoding/json"
"errors"
"fmt"
"net"
"os"
"strconv"
"strings"
"sync"
"time"
"github.com/flannel-io/flannel/pkg/ip"
"github.com/flannel-io/flannel/pkg/lease"
"github.com/flannel-io/flannel/pkg/subnet"
"golang.org/x/net/context"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
clientset "k8s.io/client-go/kubernetes"
listers "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
log "k8s.io/klog/v2"
)
var (
ErrUnimplemented = errors.New("unimplemented")
)
const (
resyncPeriod = 5 * time.Minute
nodeControllerSyncTimeout = 10 * time.Minute
)
type subnetFileInfo struct {
path string
ipMask bool
sn ip.IP4Net
IPv6sn ip.IP6Net
mtu int
}
type kubeSubnetManager struct {
enableIPv4 bool
enableIPv6 bool
annotations annotations
annotationPrefix string
client clientset.Interface
nodeName string
nodeStore listers.NodeLister
nodeController cache.Controller
subnetConf *subnet.Config
events chan lease.Event
clusterCIDRController cache.Controller
setNodeNetworkUnavailable bool
disableNodeInformer bool
snFileInfo *subnetFileInfo
}
func NewSubnetManager(ctx context.Context, apiUrl, kubeconfig, prefix, netConfPath string, setNodeNetworkUnavailable bool) (subnet.Manager, error) {
var cfg *rest.Config
var err error
// Try to build kubernetes config from a master url or a kubeconfig filepath. If neither masterUrl
// or kubeconfigPath are passed in we fall back to inClusterConfig. If inClusterConfig fails,
// we fallback to the default config.
cfg, err = clientcmd.BuildConfigFromFlags(apiUrl, kubeconfig)
if err != nil {
return nil, fmt.Errorf("fail to create kubernetes config: %v", err)
}
c, err := clientset.NewForConfig(cfg)
if err != nil {
return nil, fmt.Errorf("unable to initialize client: %v", err)
}
// The kube subnet mgr needs to know the k8s node name that it's running on so it can annotate it.
// If we're running as a pod then the POD_NAME and POD_NAMESPACE will be populated and can be used to find the node
// name. Otherwise, the environment variable NODE_NAME can be passed in.
nodeName := os.Getenv("NODE_NAME")
if nodeName == "" {
podName := os.Getenv("POD_NAME")
podNamespace := os.Getenv("POD_NAMESPACE")
if podName == "" || podNamespace == "" {
return nil, fmt.Errorf("env variables POD_NAME and POD_NAMESPACE must be set")
}
pod, err := c.CoreV1().Pods(podNamespace).Get(ctx, podName, metav1.GetOptions{})
if err != nil {
return nil, fmt.Errorf("error retrieving pod spec for '%s/%s': %v", podNamespace, podName, err)
}
nodeName = pod.Spec.NodeName
if nodeName == "" {
return nil, fmt.Errorf("node name not present in pod spec '%s/%s'", podNamespace, podName)
}
}
netConf, err := os.ReadFile(netConfPath)
if err != nil {
return nil, fmt.Errorf("failed to read net conf: %v", err)
}
sc, err := subnet.ParseConfig(string(netConf))
if err != nil {
return nil, fmt.Errorf("error parsing subnet config: %s", err)
}
sm, err := newKubeSubnetManager(ctx, c, sc, nodeName, prefix)
if err != nil {
return nil, fmt.Errorf("error creating network manager: %s", err)
}
sm.setNodeNetworkUnavailable = setNodeNetworkUnavailable
if sm.disableNodeInformer {
log.Infof("Node controller skips sync")
} else {
go sm.Run(context.Background())
log.Infof("Waiting %s for node controller to sync", nodeControllerSyncTimeout)
err = wait.Poll(time.Second, nodeControllerSyncTimeout, func() (bool, error) {
return sm.nodeController.HasSynced(), nil
})
if err != nil {
return nil, fmt.Errorf("error waiting for nodeController to sync state: %v", err)
}
log.Infof("Node controller sync successful")
}
return sm, nil
}
// newKubeSubnetManager fills the kubeSubnetManager. The most important part is the controller which will
// watch for kubernetes node updates
func newKubeSubnetManager(ctx context.Context, c clientset.Interface, sc *subnet.Config, nodeName, prefix string) (*kubeSubnetManager, error) {
var err error
var ksm kubeSubnetManager
ksm.annotationPrefix = prefix
ksm.annotations, err = newAnnotations(prefix)
if err != nil {
return nil, err
}
ksm.enableIPv4 = sc.EnableIPv4
ksm.enableIPv6 = sc.EnableIPv6
ksm.client = c
ksm.nodeName = nodeName
ksm.subnetConf = sc
scale := 5000
scaleStr := os.Getenv("EVENT_QUEUE_DEPTH")
if scaleStr != "" {
n, err := strconv.Atoi(scaleStr)
if err != nil {
return nil, fmt.Errorf("env EVENT_QUEUE_DEPTH=%s format error: %v", scaleStr, err)
}
if n > 0 {
scale = n
}
}
ksm.events = make(chan lease.Event, scale)
// when backend type is alloc, someone else (e.g. cloud-controller-managers) is taking care of the routing, thus we do not need informer
// See https://github.com/flannel-io/flannel/issues/1617
if sc.BackendType == "alloc" {
ksm.disableNodeInformer = true
}
if !ksm.disableNodeInformer {
indexer, controller := cache.NewIndexerInformer(
&cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return ksm.client.CoreV1().Nodes().List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return ksm.client.CoreV1().Nodes().Watch(ctx, options)
},
},
&v1.Node{},
resyncPeriod,
cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
ksm.handleAddLeaseEvent(lease.EventAdded, obj)
},
UpdateFunc: ksm.handleUpdateLeaseEvent,
DeleteFunc: func(obj interface{}) {
_, isNode := obj.(*v1.Node)
// We can get DeletedFinalStateUnknown instead of *api.Node here and we need to handle that correctly.
if !isNode {
deletedState, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
log.Infof("Error received unexpected object: %v", obj)
return
}
node, ok := deletedState.Obj.(*v1.Node)
if !ok {
log.Infof("Error deletedFinalStateUnknown contained non-Node object: %v", deletedState.Obj)
return
}
obj = node
}
ksm.handleAddLeaseEvent(lease.EventRemoved, obj)
},
},
cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
)
ksm.nodeController = controller
ksm.nodeStore = listers.NewNodeLister(indexer)
}
return &ksm, nil
}
func (ksm *kubeSubnetManager) handleAddLeaseEvent(et lease.EventType, obj interface{}) {
n := obj.(*v1.Node)
if s, ok := n.Annotations[ksm.annotations.SubnetKubeManaged]; !ok || s != "true" {
return
}
l, err := ksm.nodeToLease(*n)
if err != nil {
log.Infof("Error turning node %q to lease: %v", n.ObjectMeta.Name, err)
return
}
ksm.events <- lease.Event{Type: et, Lease: l}
}
// handleUpdateLeaseEvent verifies if anything relevant changed in the node object: either
// ksm.annotations.BackendData, ksm.annotations.BackendType or ksm.annotations.BackendPublicIP
func (ksm *kubeSubnetManager) handleUpdateLeaseEvent(oldObj, newObj interface{}) {
o := oldObj.(*v1.Node)
n := newObj.(*v1.Node)
if s, ok := n.Annotations[ksm.annotations.SubnetKubeManaged]; !ok || s != "true" {
return
}
var changed = true
if ksm.enableIPv4 && o.Annotations[ksm.annotations.BackendData] == n.Annotations[ksm.annotations.BackendData] &&
o.Annotations[ksm.annotations.BackendType] == n.Annotations[ksm.annotations.BackendType] &&
o.Annotations[ksm.annotations.BackendPublicIP] == n.Annotations[ksm.annotations.BackendPublicIP] {
changed = false
}
if ksm.enableIPv6 && o.Annotations[ksm.annotations.BackendV6Data] == n.Annotations[ksm.annotations.BackendV6Data] &&
o.Annotations[ksm.annotations.BackendType] == n.Annotations[ksm.annotations.BackendType] &&
o.Annotations[ksm.annotations.BackendPublicIPv6] == n.Annotations[ksm.annotations.BackendPublicIPv6] {
changed = false
}
if !changed {
return // No change to lease
}
l, err := ksm.nodeToLease(*n)
if err != nil {
log.Infof("Error turning node %q to lease: %v", n.ObjectMeta.Name, err)
return
}
ksm.events <- lease.Event{Type: lease.EventAdded, Lease: l}
}
func (ksm *kubeSubnetManager) GetNetworkConfig(ctx context.Context) (*subnet.Config, error) {
return ksm.subnetConf, nil
}
// AcquireLease adds the flannel specific node annotations (defined in the struct LeaseAttrs) and returns a lease
// with important information for the backend, such as the subnet. This function is called once by the backend when
// registering
func (ksm *kubeSubnetManager) AcquireLease(ctx context.Context, attrs *lease.LeaseAttrs) (*lease.Lease, error) {
var cachedNode *v1.Node
var err error
if ksm.disableNodeInformer {
cachedNode, err = ksm.client.CoreV1().Nodes().Get(ctx, ksm.nodeName, metav1.GetOptions{ResourceVersion: "0"})
} else {
cachedNode, err = ksm.nodeStore.Get(ksm.nodeName)
}
if err != nil {
return nil, err
}
n := cachedNode.DeepCopy()
if n.Spec.PodCIDR == "" {
return nil, fmt.Errorf("node %q pod cidr not assigned", ksm.nodeName)
}
var bd, v6Bd []byte
bd, err = attrs.BackendData.MarshalJSON()
if err != nil {
return nil, err
}
v6Bd, err = attrs.BackendV6Data.MarshalJSON()
if err != nil {
return nil, err
}
var cidr, ipv6Cidr *net.IPNet
switch {
case len(n.Spec.PodCIDRs) == 0:
_, parseCidr, err := net.ParseCIDR(n.Spec.PodCIDR)
if err != nil {
return nil, err
}
if len(parseCidr.IP) == net.IPv4len {
cidr = parseCidr
} else if len(parseCidr.IP) == net.IPv6len {
ipv6Cidr = parseCidr
}
case len(n.Spec.PodCIDRs) < 3:
for _, podCidr := range n.Spec.PodCIDRs {
_, parseCidr, err := net.ParseCIDR(podCidr)
if err != nil {
return nil, err
}
if len(parseCidr.IP) == net.IPv4len {
cidr = parseCidr
} else if len(parseCidr.IP) == net.IPv6len {
ipv6Cidr = parseCidr
}
}
default:
return nil, fmt.Errorf("node %q pod cidrs should be IPv4/IPv6 only or dualstack", ksm.nodeName)
}
if (n.Annotations[ksm.annotations.BackendData] != string(bd) ||
n.Annotations[ksm.annotations.BackendType] != attrs.BackendType ||
n.Annotations[ksm.annotations.BackendPublicIP] != attrs.PublicIP.String() ||
n.Annotations[ksm.annotations.SubnetKubeManaged] != "true" ||
(n.Annotations[ksm.annotations.BackendPublicIPOverwrite] != "" && n.Annotations[ksm.annotations.BackendPublicIPOverwrite] != attrs.PublicIP.String())) ||
(attrs.PublicIPv6 != nil &&
(n.Annotations[ksm.annotations.BackendV6Data] != string(v6Bd) ||
n.Annotations[ksm.annotations.BackendType] != attrs.BackendType ||
n.Annotations[ksm.annotations.BackendPublicIPv6] != attrs.PublicIPv6.String() ||
n.Annotations[ksm.annotations.SubnetKubeManaged] != "true" ||
(n.Annotations[ksm.annotations.BackendPublicIPv6Overwrite] != "" && n.Annotations[ksm.annotations.BackendPublicIPv6Overwrite] != attrs.PublicIPv6.String()))) {
n.Annotations[ksm.annotations.BackendType] = attrs.BackendType
//TODO -i only vxlan and host-gw backends support dual stack now.
if (attrs.BackendType == "vxlan" && string(bd) != "null") || (attrs.BackendType == "wireguard" && string(bd) != "null") || attrs.BackendType != "vxlan" {
n.Annotations[ksm.annotations.BackendData] = string(bd)
if n.Annotations[ksm.annotations.BackendPublicIPOverwrite] != "" {
if n.Annotations[ksm.annotations.BackendPublicIP] != n.Annotations[ksm.annotations.BackendPublicIPOverwrite] {
log.Infof("Overriding public ip with '%s' from node annotation '%s'",
n.Annotations[ksm.annotations.BackendPublicIPOverwrite],
ksm.annotations.BackendPublicIPOverwrite)
n.Annotations[ksm.annotations.BackendPublicIP] = n.Annotations[ksm.annotations.BackendPublicIPOverwrite]
}
} else {
n.Annotations[ksm.annotations.BackendPublicIP] = attrs.PublicIP.String()
}
}
if (attrs.BackendType == "vxlan" && string(v6Bd) != "null") ||
(attrs.BackendType == "wireguard" && string(v6Bd) != "null" && attrs.PublicIPv6 != nil) ||
(attrs.BackendType == "host-gw" && attrs.PublicIPv6 != nil) ||
(attrs.BackendType == "extension" && attrs.PublicIPv6 != nil) {
n.Annotations[ksm.annotations.BackendV6Data] = string(v6Bd)
if n.Annotations[ksm.annotations.BackendPublicIPv6Overwrite] != "" {
if n.Annotations[ksm.annotations.BackendPublicIPv6] != n.Annotations[ksm.annotations.BackendPublicIPv6Overwrite] {
log.Infof("Overriding public ipv6 with '%s' from node annotation '%s'",
n.Annotations[ksm.annotations.BackendPublicIPv6Overwrite],
ksm.annotations.BackendPublicIPv6Overwrite)
n.Annotations[ksm.annotations.BackendPublicIPv6] = n.Annotations[ksm.annotations.BackendPublicIPv6Overwrite]
}
} else {
n.Annotations[ksm.annotations.BackendPublicIPv6] = attrs.PublicIPv6.String()
}
}
n.Annotations[ksm.annotations.SubnetKubeManaged] = "true"
oldData, err := json.Marshal(cachedNode)
if err != nil {
return nil, err
}
newData, err := json.Marshal(n)
if err != nil {
return nil, err
}
patchBytes, err := strategicpatch.CreateTwoWayMergePatch(oldData, newData, v1.Node{})
if err != nil {
return nil, fmt.Errorf("failed to create patch for node %q: %v", ksm.nodeName, err)
}
_, err = ksm.client.CoreV1().Nodes().Patch(ctx, ksm.nodeName, types.StrategicMergePatchType, patchBytes, metav1.PatchOptions{}, "status")
if err != nil {
return nil, err
}
}
lease := &lease.Lease{
Attrs: *attrs,
Expiration: time.Now().Add(24 * time.Hour),
}
if cidr != nil && ksm.enableIPv4 {
ipnet := ip.FromIPNet(cidr)
net, err := ksm.subnetConf.GetFlannelNetwork(&ipnet)
if err != nil {
return nil, err
}
// this check is still needed when we use the flannel configuration and not the MultiClusterCIDR API
if !containsCIDR(net.ToIPNet(), cidr) {
return nil, fmt.Errorf("subnet %q specified in the flannel net config doesn't contain %q PodCIDR of the %q node", ksm.subnetConf.Network, cidr, ksm.nodeName)
}
lease.Subnet = ip.FromIPNet(cidr)
}
if ipv6Cidr != nil {
ip6net := ip.FromIP6Net(ipv6Cidr)
net, err := ksm.subnetConf.GetFlannelIPv6Network(&ip6net)
if err != nil {
return nil, err
}
// this check is still needed when we use the flannel configuration and not the MultiClusterCIDR API
if !containsCIDR(net.ToIPNet(), ipv6Cidr) {
return nil, fmt.Errorf("subnet %q specified in the flannel net config doesn't contain %q IPv6 PodCIDR of the %q node", net, ipv6Cidr, ksm.nodeName)
}
lease.IPv6Subnet = ip.FromIP6Net(ipv6Cidr)
}
//TODO - only vxlan, host-gw and wireguard backends support dual stack now.
if attrs.BackendType != "vxlan" && attrs.BackendType != "host-gw" && attrs.BackendType != "wireguard" {
lease.EnableIPv4 = true
lease.EnableIPv6 = false
}
return lease, nil
}
// WatchLeases waits for the kubeSubnetManager to provide an event in case something relevant changed in the node data
func (ksm *kubeSubnetManager) WatchLeases(ctx context.Context, receiver chan []lease.LeaseWatchResult) error {
for {
select {
case event := <-ksm.events:
receiver <- []lease.LeaseWatchResult{
{
Events: []lease.Event{event},
}}
case <-ctx.Done():
close(receiver)
return ctx.Err()
}
}
}
func (ksm *kubeSubnetManager) Run(ctx context.Context) {
log.Infof("Starting kube subnet manager")
ksm.nodeController.Run(ctx.Done())
}
// nodeToLease updates the lease with information fetch from the node, e.g. PodCIDR
func (ksm *kubeSubnetManager) nodeToLease(n v1.Node) (l lease.Lease, err error) {
if ksm.enableIPv4 {
l.Attrs.PublicIP, err = ip.ParseIP4(n.Annotations[ksm.annotations.BackendPublicIP])
if err != nil {
return l, err
}
l.Attrs.BackendData = json.RawMessage(n.Annotations[ksm.annotations.BackendData])
var cidr *net.IPNet
switch {
case len(n.Spec.PodCIDRs) == 0:
_, cidr, err = net.ParseCIDR(n.Spec.PodCIDR)
if err != nil {
return l, err
}
case len(n.Spec.PodCIDRs) < 3:
log.Infof("Creating the node lease for IPv4. This is the n.Spec.PodCIDRs: %v", n.Spec.PodCIDRs)
for _, podCidr := range n.Spec.PodCIDRs {
_, parseCidr, err := net.ParseCIDR(podCidr)
if err != nil {
return l, err
}
if len(parseCidr.IP) == net.IPv4len {
cidr = parseCidr
break
}
}
default:
return l, fmt.Errorf("node %q pod cidrs should be IPv4/IPv6 only or dualstack", ksm.nodeName)
}
l.Subnet = ip.FromIPNet(cidr)
l.EnableIPv4 = ksm.enableIPv4
}
if ksm.enableIPv6 {
l.Attrs.PublicIPv6, err = ip.ParseIP6(n.Annotations[ksm.annotations.BackendPublicIPv6])
if err != nil {
return l, err
}
l.Attrs.BackendV6Data = json.RawMessage(n.Annotations[ksm.annotations.BackendV6Data])
var ipv6Cidr *net.IPNet
switch {
case len(n.Spec.PodCIDRs) == 0:
_, ipv6Cidr, err = net.ParseCIDR(n.Spec.PodCIDR)
if err != nil {
return l, err
}
case len(n.Spec.PodCIDRs) < 3:
log.Infof("Creating the node lease for IPv6. This is the n.Spec.PodCIDRs: %v", n.Spec.PodCIDRs)
for _, podCidr := range n.Spec.PodCIDRs {
_, parseCidr, err := net.ParseCIDR(podCidr)
if err != nil {
return l, err
}
if len(parseCidr.IP) == net.IPv6len {
ipv6Cidr = parseCidr
break
}
}
default:
return l, fmt.Errorf("node %q pod cidrs should be IPv4/IPv6 only or dualstack", ksm.nodeName)
}
l.IPv6Subnet = ip.FromIP6Net(ipv6Cidr)
l.EnableIPv6 = ksm.enableIPv6
}
l.Attrs.BackendType = n.Annotations[ksm.annotations.BackendType]
return l, nil
}
// RenewLease: unimplemented
func (ksm *kubeSubnetManager) RenewLease(ctx context.Context, lease *lease.Lease) error {
return ErrUnimplemented
}
func (ksm *kubeSubnetManager) WatchLease(ctx context.Context, sn ip.IP4Net, sn6 ip.IP6Net, receiver chan []lease.LeaseWatchResult) error {
return ErrUnimplemented
}
func (ksm *kubeSubnetManager) Name() string {
return fmt.Sprintf("Kubernetes Subnet Manager - %s", ksm.nodeName)
}
// CompleteLease Set Kubernetes NodeNetworkUnavailable to false when starting
// https://kubernetes.io/docs/concepts/architecture/nodes/#condition
func (ksm *kubeSubnetManager) CompleteLease(ctx context.Context, lease *lease.Lease, wg *sync.WaitGroup) error {
if ksm.clusterCIDRController != nil {
//start clusterController after all subnet manager has been fully initialized
log.Info("starting clusterCIDR controller...")
go ksm.clusterCIDRController.Run(ctx.Done())
log.Infof("Waiting %s for clusterCIDR controller to sync...", nodeControllerSyncTimeout)
err := wait.Poll(time.Second, nodeControllerSyncTimeout, func() (bool, error) {
return ksm.clusterCIDRController.HasSynced(), nil
})
if err != nil {
return fmt.Errorf("error waiting for clusterCIDR to sync state: %v", err)
}
log.Infof("clusterCIDR controller sync successful")
}
if !ksm.setNodeNetworkUnavailable {
// not set NodeNetworkUnavailable NodeCondition
return nil
}
condition := v1.NodeCondition{
Type: v1.NodeNetworkUnavailable,
Status: v1.ConditionFalse,
Reason: "FlannelIsUp",
Message: "Flannel is running on this node",
LastTransitionTime: metav1.Now(),
LastHeartbeatTime: metav1.Now(),
}
raw, err := json.Marshal(&[]v1.NodeCondition{condition})
if err != nil {
return err
}
patch := []byte(fmt.Sprintf(`{"status":{"conditions":%s}}`, raw))
_, err = ksm.client.CoreV1().Nodes().PatchStatus(ctx, ksm.nodeName, patch)
return err
}
func containsCIDR(ipnet1, ipnet2 *net.IPNet) bool {
ones1, _ := ipnet1.Mask.Size()
ones2, _ := ipnet2.Mask.Size()
return ones1 <= ones2 && ipnet1.Contains(ipnet2.IP)
}
// HandleSubnetFile writes the configuration file used by the CNI flannel plugin
// and stores the immutable data in a dedicated struct of the subnet manager
// so that we can update the file later when a clustercidr resource is created.
func (m *kubeSubnetManager) HandleSubnetFile(path string, config *subnet.Config, ipMasq bool, sn ip.IP4Net, ipv6sn ip.IP6Net, mtu int) error {
m.snFileInfo = &subnetFileInfo{
path: path,
ipMask: ipMasq,
sn: sn,
IPv6sn: ipv6sn,
mtu: mtu,
}
return subnet.WriteSubnetFile(path, config, ipMasq, sn, ipv6sn, mtu)
}
// GetStoredMacAddress reads MAC address from node annotations when flannel restarts
func (ksm *kubeSubnetManager) GetStoredMacAddress() string {
// get mac info from Name func.
node, err := ksm.client.CoreV1().Nodes().Get(context.TODO(), ksm.nodeName, metav1.GetOptions{})
if err != nil {
log.Errorf("Failed to get node for backend data: %v", err)
return ""
}
// node backend data format: `{"VNI":1,"VtepMAC":"12:c6:65:89:b4:e3"}`
// and we will return only mac addr str like 12:c6:65:89:b4:e3
if node != nil && node.Annotations != nil {
log.Infof("List of node(%s) annotations: %#+v", ksm.nodeName, node.Annotations)
backendData, ok := node.Annotations[fmt.Sprintf("%s/backend-data", ksm.annotationPrefix)]
if ok {
macStr := strings.Trim(backendData, "\"}")
macInfoSlice := strings.Split(macStr, ":\"")
if len(macInfoSlice) == 2 {
return macInfoSlice[1]
}
}
}
return ""
}