proxier.nodeLabels[k] = v
	}
	proxier.mu.Unlock()
	proxier.logger.V(4).Info("Updated proxier node labels", "labels", node.Labels)

	proxier.Sync()
}

// OnNodeUpdate is called whenever modification of an existing
// node object is observed.
func (proxier *Proxier) OnNodeUpdate(oldNode, node *v1.Node) {
	if node.Name != proxier.hostname {

func (proxier *Proxier) SyncLoop() {
	// Update healthz timestamp at beginning in case Sync() never succeeds.
	if proxier.healthzServer != nil {
		proxier.healthzServer.Updated(proxier.ipFamily)
	}
	// synthesize "last change queued" time as the informers are syncing.
	metrics.SyncProxyRulesLastQueuedTimestamp.SetToCurrentTime()
	proxier.syncRunner.Loop(wait.NeverStop)
}

func (proxier *Proxier) Sync() {
	if proxier.healthzServer != nil {
		proxier.healthzServer.QueuedUpdate(proxier.ipFamily)
	}
	metrics.SyncProxyRulesLastQueuedTimestamp.SetToCurrentTime()
	proxier.syncRunner.Run()
}

// SyncLoop runs periodic work.  This is expected to run as a goroutine or as the main loop of the app.  It does not return.
func (proxier *Proxier) SyncLoop() {

	}
}

// This assumes proxier.mu is held
func (proxier *Proxier) probability(n int) string {
	if n >= len(proxier.precomputedProbabilities) {
		proxier.precomputeProbabilities(n)
	}
	return proxier.precomputedProbabilities[n]
}

// Sync is called to synchronize the proxier state to iptables as soon as possible.
func (proxier *Proxier) Sync() {
	if proxier.healthzServer != nil {

// proxy rules.
func (proxier *metaProxier) Sync() {
	proxier.ipv4Proxier.Sync()
	proxier.ipv6Proxier.Sync()
}

// SyncLoop runs periodic work.  This is expected to run as a
// goroutine or as the main loop of the app.  It does not return.
func (proxier *metaProxier) SyncLoop() {
	go proxier.ipv6Proxier.SyncLoop() // Use go-routine here!
	proxier.ipv4Proxier.SyncLoop()    // never returns
}

}

func makeServiceMap(proxier *Proxier, allServices ...*v1.Service) {
	for i := range allServices {
		proxier.OnServiceAdd(allServices[i])
	}

	proxier.mu.Lock()
	defer proxier.mu.Unlock()
	proxier.servicesSynced = true
}
func deleteServices(proxier *Proxier, allServices ...*v1.Service) {
	for i := range allServices {
		proxier.OnServiceDelete(allServices[i])
	}

	}

	var proxier proxy.Provider
	var err error

	if dualStackMode {
		proxier, err = winkernel.NewDualStackProxier(
			config.IPTables.SyncPeriod.Duration,
			config.IPTables.MinSyncPeriod.Duration,
			s.Hostname,
			s.NodeIPs,
			s.Recorder,
			s.HealthzServer,
			config.HealthzBindAddress,
			config.Winkernel,
		)
	} else {
		proxier, err = winkernel.NewProxier(

				initOnly,
			)
		}
		if err != nil {
			return nil, fmt.Errorf("unable to create proxier: %v", err)
		}
	} else if config.Mode == proxyconfigapi.ProxyModeNFTables {
		logger.Info("Using nftables Proxier")

		if dualStack {
			// TODO this has side effects that should only happen when Run() is invoked.
			proxier, err = nftables.NewDualStackProxier(
				ctx,
				config.NFTables.SyncPeriod.Duration,

		}
		cfg.TLS = tlsConfig
	}
	if cfg.Proxier == nil {
		cfg.Proxier = utilnet.NewProxierWithNoProxyCIDR(http.ProxyFromEnvironment)
	}
	return &SpdyRoundTripper{
		tlsConfig:        cfg.TLS,
		proxier:          cfg.Proxier,
		pingPeriod:       cfg.PingPeriod,
		upgradeTransport: cfg.UpgradeTransport,
	}, nil
}

```
Using ipvs Proxier.
```

While there is no IPVS proxy rules or the following logs occurs indicate that the kube-proxy fails to use IPVS mode:
```
Can't use ipvs proxier, trying iptables proxier
Using iptables Proxier.
```
See the following section for more details on debugging.

## Debug

### Check IPVS proxy rules