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[kube-proxy:nftables] Add partialSync mode to only transact changed

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objects.
Change the order of operations to stop current iteration if no changes
to the service chains are needed.
Bump syncProxy frequency to 1 hour.
In a test kind cluster creation of 10K services, 2 endpoints each,
takes ~25m before the fix and ~9min after. Maximum memory usage
during creation is ~650MiB and 260MiB respectively.
Another important metric is the time it takes to create 1 new service
when 10K svc already exist. It used to take ~8m before the fix,
with partialSync it takes ~141ms.

Signed-off-by: Nadia Pinaeva <n.m.pinaeva@gmail.com>
This commit is contained in:
Nadia Pinaeva 2024-06-05 20:22:54 +02:00
parent dc13e42f56
commit 3ccf5b8a55
3 changed files with 224 additions and 71 deletions
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2
pkg/proxy/metrics/metrics.go
View File

@ -316,6 +316,8 @@ func RegisterMetrics(mode kubeproxyconfig.ProxyMode) {
legacyregistry.MustRegister(IPTablesRestoreFailuresTotal)
case kubeproxyconfig.ProxyModeNFTables:
legacyregistry.MustRegister(SyncFullProxyRulesLatency)
legacyregistry.MustRegister(SyncPartialProxyRulesLatency)
legacyregistry.MustRegister(NFTablesSyncFailuresTotal)
legacyregistry.MustRegister(NFTablesCleanupFailuresTotal)

286
pkg/proxy/nftables/proxier.go
View File

@ -162,6 +162,7 @@ type Proxier struct {
// updating nftables with some partial data after kube-proxy restart.
endpointSlicesSynced bool
servicesSynced bool
needFullSync bool
initialized int32
syncRunner *async.BoundedFrequencyRunner // governs calls to syncProxyRules
syncPeriod time.Duration
@ -194,6 +195,13 @@ type Proxier struct {
serviceCIDRs string
logger klog.Logger
clusterIPs *nftElementStorage
serviceIPs *nftElementStorage
firewallIPs *nftElementStorage
noEndpointServices *nftElementStorage
noEndpointNodePorts *nftElementStorage
serviceNodePorts *nftElementStorage
}
// Proxier implements proxy.Provider
@ -243,6 +251,7 @@ func NewProxier(ctx context.Context,
serviceChanges: proxy.NewServiceChangeTracker(newServiceInfo, ipFamily, recorder, nil),
endpointsMap: make(proxy.EndpointsMap),
endpointsChanges: proxy.NewEndpointsChangeTracker(hostname, newEndpointInfo, ipFamily, recorder, nil),
needFullSync: true,
syncPeriod: syncPeriod,
nftables: nft,
masqueradeAll: masqueradeAll,
@ -258,11 +267,18 @@ func NewProxier(ctx context.Context,
networkInterfacer: proxyutil.RealNetwork{},
staleChains: make(map[string]time.Time),
logger: logger,
clusterIPs: newNFTElementStorage("set", clusterIPsSet),
serviceIPs: newNFTElementStorage("map", serviceIPsMap),
firewallIPs: newNFTElementStorage("map", firewallIPsMap),
noEndpointServices: newNFTElementStorage("map", noEndpointServicesMap),
noEndpointNodePorts: newNFTElementStorage("map", noEndpointNodePortsMap),
serviceNodePorts: newNFTElementStorage("map", serviceNodePortsMap),
}
burstSyncs := 2
logger.V(2).Info("NFTables sync params", "minSyncPeriod", minSyncPeriod, "syncPeriod", syncPeriod, "burstSyncs", burstSyncs)
proxier.syncRunner = async.NewBoundedFrequencyRunner("sync-runner", proxier.syncProxyRules, minSyncPeriod, syncPeriod, burstSyncs)
// We need to pass *some* maxInterval to NewBoundedFrequencyRunner. time.Hour is arbitrary.
proxier.syncRunner = async.NewBoundedFrequencyRunner("sync-runner", proxier.syncProxyRules, minSyncPeriod, time.Hour, burstSyncs)
return proxier, nil
}
@ -421,17 +437,22 @@ var nftablesJumpChains = []nftablesJumpChain{
// ensureChain adds commands to tx to ensure that chain exists and doesn't contain
// anything from before this transaction (using createdChains to ensure that we don't
// Flush a chain more than once and lose *new* rules as well.)
func ensureChain(chain string, tx *knftables.Transaction, createdChains sets.Set[string]) {
// If skipCreation is true, chain will not be added to the transaction, but will be added to the createdChains
// for proper cleanup in the end of the sync iteration.
func ensureChain(chain string, tx *knftables.Transaction, createdChains sets.Set[string], skipCreation bool) {
if createdChains.Has(chain) {
return
}
createdChains.Insert(chain)
if skipCreation {
return
}
tx.Add(&knftables.Chain{
Name: chain,
})
tx.Flush(&knftables.Chain{
Name: chain,
})
createdChains.Insert(chain)
}
func (proxier *Proxier) setupNFTables(tx *knftables.Transaction) {
@ -477,7 +498,7 @@ func (proxier *Proxier) setupNFTables(tx *knftables.Transaction) {
// Create and flush ordinary chains and add rules jumping to them
createdChains := sets.New[string]()
for _, c := range nftablesJumpChains {
ensureChain(c.dstChain, tx, createdChains)
ensureChain(c.dstChain, tx, createdChains, false)
tx.Add(&knftables.Rule{
Chain: c.srcChain,
Rule: knftables.Concat(
@ -489,7 +510,7 @@ func (proxier *Proxier) setupNFTables(tx *knftables.Transaction) {
// Ensure all of our other "top-level" chains exist
for _, chain := range []string{servicesChain, clusterIPsCheckChain, masqueradingChain, markMasqChain} {
ensureChain(chain, tx, createdChains)
ensureChain(chain, tx, createdChains, false)
}
// Add the rules in the mark-for-masquerade and masquerading chains
@ -639,7 +660,7 @@ func (proxier *Proxier) setupNFTables(tx *knftables.Transaction) {
Comment: ptr.To("destinations that are subject to LoadBalancerSourceRanges"),
})
ensureChain(firewallCheckChain, tx, createdChains)
ensureChain(firewallCheckChain, tx, createdChains, false)
tx.Add(&knftables.Rule{
Chain: firewallCheckChain,
Rule: knftables.Concat(
@ -686,6 +707,14 @@ func (proxier *Proxier) setupNFTables(tx *knftables.Transaction) {
),
})
}
// flush containers
proxier.clusterIPs.reset(tx)
proxier.serviceIPs.reset(tx)
proxier.firewallIPs.reset(tx)
proxier.noEndpointServices.reset(tx)
proxier.noEndpointNodePorts.reset(tx)
proxier.serviceNodePorts.reset(tx)
}
// CleanupLeftovers removes all nftables rules and chains created by the Proxier
@ -830,6 +859,7 @@ func (proxier *Proxier) OnNodeAdd(node *v1.Node) {
for k, v := range node.Labels {
proxier.nodeLabels[k] = v
}
proxier.needFullSync = true
proxier.mu.Unlock()
proxier.logger.V(4).Info("Updated proxier node labels", "labels", node.Labels)
@ -854,6 +884,7 @@ func (proxier *Proxier) OnNodeUpdate(oldNode, node *v1.Node) {
for k, v := range node.Labels {
proxier.nodeLabels[k] = v
}
proxier.needFullSync = true
proxier.mu.Unlock()
proxier.logger.V(4).Info("Updated proxier node labels", "labels", node.Labels)
@ -871,6 +902,7 @@ func (proxier *Proxier) OnNodeDelete(node *v1.Node) {
proxier.mu.Lock()
proxier.nodeLabels = nil
proxier.needFullSync = true
proxier.mu.Unlock()
proxier.Sync()
@ -1015,6 +1047,96 @@ func isAffinitySetName(set string) bool {
return strings.HasPrefix(set, servicePortEndpointAffinityNamePrefix)
}
// nftElementStorage is an internal representation of nftables map or set.
type nftElementStorage struct {
elements map[string]string
leftoverKeys sets.Set[string]
containerType string
containerName string
}
// joinNFTSlice converts nft element key or value (type []string) to string to store in the nftElementStorage.
// The separator is the same as the one used by nft commands, so we know that the parsing is going to be unambiguous.
func joinNFTSlice(k []string) string {
return strings.Join(k, " . ")
}
// splitNFTSlice converts nftElementStorage key or value string representation back to slice.
func splitNFTSlice(k string) []string {
return strings.Split(k, " . ")
}
// newNFTElementStorage creates an empty nftElementStorage.
// nftElementStorage.reset() must be called before the first usage.
func newNFTElementStorage(containerType, containerName string) *nftElementStorage {
c := &nftElementStorage{
elements: make(map[string]string),
leftoverKeys: sets.New[string](),
containerType: containerType,
containerName: containerName,
}
return c
}
// reset clears the internal state and flushes the nftables map/set.
func (s *nftElementStorage) reset(tx *knftables.Transaction) {
clear(s.elements)
if s.containerType == "set" {
tx.Flush(&knftables.Set{
Name: s.containerName,
})
} else {
tx.Flush(&knftables.Map{
Name: s.containerName,
})
}
s.resetLeftoverKeys()
}
// resetLeftoverKeys is only called internally by nftElementStorage methods.
func (s *nftElementStorage) resetLeftoverKeys() {
clear(s.leftoverKeys)
for key := range s.elements {
s.leftoverKeys.Insert(key)
}
}
// ensureElem adds elem to the transaction if elem is not present in the container, and updates internal
// leftoverKeys set to track unused elements.
func (s *nftElementStorage) ensureElem(tx *knftables.Transaction, elem *knftables.Element) {
newKey := joinNFTSlice(elem.Key)
newValue := joinNFTSlice(elem.Value)
existingValue, exists := s.elements[newKey]
if exists {
if existingValue != newValue {
// value is different, delete and re-add
tx.Delete(elem)
tx.Add(elem)
s.elements[newKey] = newValue
}
delete(s.leftoverKeys, newKey)
} else {
tx.Add(elem)
s.elements[newKey] = newValue
}
}
func (s *nftElementStorage) cleanupLeftoverKeys(tx *knftables.Transaction) {
for key := range s.leftoverKeys {
e := &knftables.Element{
Key: splitNFTSlice(key),
}
if s.containerType == "set" {
e.Set = s.containerName
} else {
e.Map = s.containerName
}
tx.Delete(e)
delete(s.elements, key)
}
s.resetLeftoverKeys()
}
// This is where all of the nftables calls happen.
// This assumes proxier.mu is NOT held
func (proxier *Proxier) syncProxyRules() {
@ -1031,10 +1153,19 @@ func (proxier *Proxier) syncProxyRules() {
// Below this point we will not return until we try to write the nftables rules.
//
// The value of proxier.needFullSync may change before the defer funcs run, so
// we need to keep track of whether it was set at the *start* of the sync.
tryPartialSync := !proxier.needFullSync
// Keep track of how long syncs take.
start := time.Now()
defer func() {
metrics.SyncProxyRulesLatency.Observe(metrics.SinceInSeconds(start))
if tryPartialSync {
metrics.SyncPartialProxyRulesLatency.Observe(metrics.SinceInSeconds(start))
} else {
metrics.SyncFullProxyRulesLatency.Observe(metrics.SinceInSeconds(start))
}
proxier.logger.V(2).Info("SyncProxyRules complete", "elapsed", time.Since(start))
}()
@ -1048,6 +1179,10 @@ func (proxier *Proxier) syncProxyRules() {
if !success {
proxier.logger.Info("Sync failed", "retryingTime", proxier.syncPeriod)
proxier.syncRunner.RetryAfter(proxier.syncPeriod)
// proxier.serviceChanges and proxier.endpointChanges have already
// been flushed, so we've lost the state needed to be able to do
// a partial sync.
proxier.needFullSync = true
}
}()
@ -1081,7 +1216,9 @@ func (proxier *Proxier) syncProxyRules() {
// Now start the actual syncing transaction
tx := proxier.nftables.NewTransaction()
proxier.setupNFTables(tx)
if !tryPartialSync {
proxier.setupNFTables(tx)
}
// We need to use, eg, "ip daddr" for IPv4 but "ip6 daddr" for IPv6
ipX := "ip"
@ -1091,26 +1228,6 @@ func (proxier *Proxier) syncProxyRules() {
ipvX_addr = "ipv6_addr"
}
// We currently fully-rebuild our sets and maps on each resync
tx.Flush(&knftables.Set{
Name: clusterIPsSet,
})
tx.Flush(&knftables.Map{
Name: firewallIPsMap,
})
tx.Flush(&knftables.Map{
Name: noEndpointServicesMap,
})
tx.Flush(&knftables.Map{
Name: noEndpointNodePortsMap,
})
tx.Flush(&knftables.Map{
Name: serviceIPsMap,
})
tx.Flush(&knftables.Map{
Name: serviceNodePortsMap,
})
// Accumulate service/endpoint chains and affinity sets to keep.
activeChains := sets.New[string]()
activeAffinitySets := sets.New[string]()
@ -1134,6 +1251,7 @@ func (proxier *Proxier) syncProxyRules() {
proxier.logger.Error(nil, "Failed to cast serviceInfo", "serviceName", svcName)
continue
}
protocol := strings.ToLower(string(svcInfo.Protocol()))
svcPortNameString := svcInfo.nameString
@ -1144,10 +1262,20 @@ func (proxier *Proxier) syncProxyRules() {
allEndpoints := proxier.endpointsMap[svcName]
clusterEndpoints, localEndpoints, allLocallyReachableEndpoints, hasEndpoints := proxy.CategorizeEndpoints(allEndpoints, svcInfo, proxier.nodeLabels)
// skipServiceUpdate is used for all service-related chains and their elements.
// If no changes were done to the service or its endpoints, these objects may be skipped.
skipServiceUpdate := tryPartialSync &&
!serviceUpdateResult.UpdatedServices.Has(svcName.NamespacedName) &&
!endpointUpdateResult.UpdatedServices.Has(svcName.NamespacedName)
// Note the endpoint chains that will be used
for _, ep := range allLocallyReachableEndpoints {
if epInfo, ok := ep.(*endpointInfo); ok {
ensureChain(epInfo.chainName, tx, activeChains)
ensureChain(epInfo.chainName, tx, activeChains, skipServiceUpdate)
// Note the affinity sets that will be used
if svcInfo.SessionAffinityType() == v1.ServiceAffinityClientIP {
activeAffinitySets.Insert(epInfo.affinitySetName)
}
}
}
@ -1155,14 +1283,14 @@ func (proxier *Proxier) syncProxyRules() {
clusterPolicyChain := svcInfo.clusterPolicyChainName
usesClusterPolicyChain := len(clusterEndpoints) > 0 && svcInfo.UsesClusterEndpoints()
if usesClusterPolicyChain {
ensureChain(clusterPolicyChain, tx, activeChains)
ensureChain(clusterPolicyChain, tx, activeChains, skipServiceUpdate)
}
// localPolicyChain contains the endpoints used with "Local" traffic policy
localPolicyChain := svcInfo.localPolicyChainName
usesLocalPolicyChain := len(localEndpoints) > 0 && svcInfo.UsesLocalEndpoints()
if usesLocalPolicyChain {
ensureChain(localPolicyChain, tx, activeChains)
ensureChain(localPolicyChain, tx, activeChains, skipServiceUpdate)
}
// internalPolicyChain is the chain containing the endpoints for
@ -1204,7 +1332,7 @@ func (proxier *Proxier) syncProxyRules() {
// are no externally-usable endpoints.
usesExternalTrafficChain := hasEndpoints && svcInfo.ExternallyAccessible()
if usesExternalTrafficChain {
ensureChain(externalTrafficChain, tx, activeChains)
ensureChain(externalTrafficChain, tx, activeChains, skipServiceUpdate)
}
var internalTrafficFilterVerdict, externalTrafficFilterVerdict string
@ -1235,12 +1363,12 @@ func (proxier *Proxier) syncProxyRules() {
}
// Capture the clusterIP.
tx.Add(&knftables.Element{
proxier.clusterIPs.ensureElem(tx, &knftables.Element{
Set: clusterIPsSet,
Key: []string{svcInfo.ClusterIP().String()},
})
if hasInternalEndpoints {
tx.Add(&knftables.Element{
proxier.serviceIPs.ensureElem(tx, &knftables.Element{
Map: serviceIPsMap,
Key: []string{
svcInfo.ClusterIP().String(),
@ -1253,7 +1381,7 @@ func (proxier *Proxier) syncProxyRules() {
})
} else {
// No endpoints.
tx.Add(&knftables.Element{
proxier.noEndpointServices.ensureElem(tx, &knftables.Element{
Map: noEndpointServicesMap,
Key: []string{
svcInfo.ClusterIP().String(),
@ -1272,7 +1400,7 @@ func (proxier *Proxier) syncProxyRules() {
if hasEndpoints {
// Send traffic bound for external IPs to the "external
// destinations" chain.
tx.Add(&knftables.Element{
proxier.serviceIPs.ensureElem(tx, &knftables.Element{
Map: serviceIPsMap,
Key: []string{
externalIP.String(),
@ -1288,7 +1416,7 @@ func (proxier *Proxier) syncProxyRules() {
// Either no endpoints at all (REJECT) or no endpoints for
// external traffic (DROP anything that didn't get
// short-circuited by the EXT chain.)
tx.Add(&knftables.Element{
proxier.noEndpointServices.ensureElem(tx, &knftables.Element{
Map: noEndpointServicesMap,
Key: []string{
externalIP.String(),
@ -1306,41 +1434,13 @@ func (proxier *Proxier) syncProxyRules() {
usesFWChain := len(svcInfo.LoadBalancerVIPs()) > 0 && len(svcInfo.LoadBalancerSourceRanges()) > 0
fwChain := svcInfo.firewallChainName
if usesFWChain {
ensureChain(fwChain, tx, activeChains)
var sources []string
allowFromNode := false
for _, cidr := range svcInfo.LoadBalancerSourceRanges() {
if len(sources) > 0 {
sources = append(sources, ",")
}
sources = append(sources, cidr.String())
if cidr.Contains(proxier.nodeIP) {
allowFromNode = true
}
}
// For VIP-like LBs, the VIP is often added as a local
// address (via an IP route rule). In that case, a request
// from a node to the VIP will not hit the loadbalancer but
// will loop back with the source IP set to the VIP. We
// need the following rules to allow requests from this node.
if allowFromNode {
for _, lbip := range svcInfo.LoadBalancerVIPs() {
sources = append(sources, ",", lbip.String())
}
}
tx.Add(&knftables.Rule{
Chain: fwChain,
Rule: knftables.Concat(
ipX, "saddr", "!=", "{", sources, "}",
"drop",
),
})
ensureChain(fwChain, tx, activeChains, skipServiceUpdate)
}
// Capture load-balancer ingress.
for _, lbip := range svcInfo.LoadBalancerVIPs() {
if hasEndpoints {
tx.Add(&knftables.Element{
proxier.serviceIPs.ensureElem(tx, &knftables.Element{
Map: serviceIPsMap,
Key: []string{
lbip.String(),
@ -1354,7 +1454,7 @@ func (proxier *Proxier) syncProxyRules() {
}
if usesFWChain {
tx.Add(&knftables.Element{
proxier.firewallIPs.ensureElem(tx, &knftables.Element{
Map: firewallIPsMap,
Key: []string{
lbip.String(),
@ -1372,7 +1472,7 @@ func (proxier *Proxier) syncProxyRules() {
// external traffic (DROP anything that didn't get short-circuited
// by the EXT chain.)
for _, lbip := range svcInfo.LoadBalancerVIPs() {
tx.Add(&knftables.Element{
proxier.noEndpointServices.ensureElem(tx, &knftables.Element{
Map: noEndpointServicesMap,
Key: []string{
lbip.String(),
@ -1393,7 +1493,7 @@ func (proxier *Proxier) syncProxyRules() {
// Jump to the external destination chain. For better or for
// worse, nodeports are not subject to loadBalancerSourceRanges,
// and we can't change that.
tx.Add(&knftables.Element{
proxier.serviceNodePorts.ensureElem(tx, &knftables.Element{
Map: serviceNodePortsMap,
Key: []string{
protocol,
@ -1408,7 +1508,7 @@ func (proxier *Proxier) syncProxyRules() {
// Either no endpoints at all (REJECT) or no endpoints for
// external traffic (DROP anything that didn't get
// short-circuited by the EXT chain.)
tx.Add(&knftables.Element{
proxier.noEndpointNodePorts.ensureElem(tx, &knftables.Element{
Map: noEndpointNodePortsMap,
Key: []string{
protocol,
@ -1422,6 +1522,12 @@ func (proxier *Proxier) syncProxyRules() {
}
}
// All the following operations are service-chain related and may be skipped if no svc or endpoint
// changes are required.
if skipServiceUpdate {
continue
}
// Set up internal traffic handling.
if hasInternalEndpoints {
if proxier.masqueradeAll {
@ -1520,6 +1626,37 @@ func (proxier *Proxier) syncProxyRules() {
}
}
if usesFWChain {
var sources []string
allowFromNode := false
for _, cidr := range svcInfo.LoadBalancerSourceRanges() {
if len(sources) > 0 {
sources = append(sources, ",")
}
sources = append(sources, cidr.String())
if cidr.Contains(proxier.nodeIP) {
allowFromNode = true
}
}
// For VIP-like LBs, the VIP is often added as a local
// address (via an IP route rule). In that case, a request
// from a node to the VIP will not hit the loadbalancer but
// will loop back with the source IP set to the VIP. We
// need the following rules to allow requests from this node.
if allowFromNode {
for _, lbip := range svcInfo.LoadBalancerVIPs() {
sources = append(sources, ",", lbip.String())
}
}
tx.Add(&knftables.Rule{
Chain: fwChain,
Rule: knftables.Concat(
ipX, "saddr", "!=", "{", sources, "}",
"drop",
),
})
}
if svcInfo.SessionAffinityType() == v1.ServiceAffinityClientIP {
// Generate the per-endpoint affinity sets
for _, ep := range allLocallyReachableEndpoints {
@ -1553,7 +1690,6 @@ func (proxier *Proxier) syncProxyRules() {
},
Timeout: ptr.To(time.Duration(svcInfo.StickyMaxAgeSeconds()) * time.Second),
})
activeAffinitySets.Insert(epInfo.affinitySetName)
}
}
@ -1648,6 +1784,13 @@ func (proxier *Proxier) syncProxyRules() {
proxier.logger.Error(err, "Failed to list nftables sets: stale affinity sets will not be deleted")
}
proxier.clusterIPs.cleanupLeftoverKeys(tx)
proxier.serviceIPs.cleanupLeftoverKeys(tx)
proxier.firewallIPs.cleanupLeftoverKeys(tx)
proxier.noEndpointServices.cleanupLeftoverKeys(tx)
proxier.noEndpointNodePorts.cleanupLeftoverKeys(tx)
proxier.serviceNodePorts.cleanupLeftoverKeys(tx)
// Sync rules.
proxier.logger.V(2).Info("Reloading service nftables data",
"numServices", len(proxier.svcPortMap),
@ -1669,6 +1812,7 @@ func (proxier *Proxier) syncProxyRules() {
return
}
success = true
proxier.needFullSync = false
for name, lastChangeTriggerTimes := range endpointUpdateResult.LastChangeTriggerTimes {
for _, lastChangeTriggerTime := range lastChangeTriggerTimes {

7
pkg/proxy/nftables/proxier_test.go
View File

@ -119,6 +119,7 @@ func NewFakeProxier(ipFamily v1.IPFamily) (*knftables.Fake, *Proxier) {
serviceChanges: proxy.NewServiceChangeTracker(newServiceInfo, ipFamily, nil, nil),
endpointsMap: make(proxy.EndpointsMap),
endpointsChanges: proxy.NewEndpointsChangeTracker(testHostname, newEndpointInfo, ipFamily, nil, nil),
needFullSync: true,
nftables: nft,
masqueradeMark: "0x4000",
conntrack: conntrack.NewFake(),
@ -130,6 +131,12 @@ func NewFakeProxier(ipFamily v1.IPFamily) (*knftables.Fake, *Proxier) {
networkInterfacer: networkInterfacer,
staleChains: make(map[string]time.Time),
serviceCIDRs: serviceCIDRs,
clusterIPs: newNFTElementStorage("set", clusterIPsSet),
serviceIPs: newNFTElementStorage("map", serviceIPsMap),
firewallIPs: newNFTElementStorage("map", firewallIPsMap),
noEndpointServices: newNFTElementStorage("map", noEndpointServicesMap),
noEndpointNodePorts: newNFTElementStorage("map", noEndpointNodePortsMap),
serviceNodePorts: newNFTElementStorage("map", serviceNodePortsMap),
}
p.setInitialized(true)
p.syncRunner = async.NewBoundedFrequencyRunner("test-sync-runner", p.syncProxyRules, 0, time.Minute, 1)