Repository: kubernetes-sigs/cloud-provider-azure
Pull request #7040 (2024-09-11 23:04:27)

[release-1.30] fix: Do not move nodes that have already been attached to load balanc…

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/kind bug

#### What this PR does / why we need it:

fix: Do not move nodes that have already been attached to load balancers after restarting

When using multislb, the node distribution could be changed after restarting the ccm. This is because the node distribution cache would be lost after restarting. This PR restores the node distribution each time the ccm is restarted.

#### Which issue(s) this PR fixes:
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Fixes #

#### Special notes for your reviewer:

This only affects cluster services.

#### Does this PR introduce a user-facing change?
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```release-note
fix: Do not move nodes that have already been attached to load balancers after restarting

When using multislb, the node distribution could be changed after restarting the ccm. This is because the node distribution cache would be lost after restarting. This PR restores the node distribution each time the ccm is restarted.
```

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Patch:
diff --git a/go.sum b/go.sum
index 5319bc44d..7c1c88445 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,5 @@
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@@ -69,8 +71,12 @@ github.com/AzureAD/microsoft-authentication-library-for-go v1.2.2 h1:XHOnouVk1mx
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@@ -133,6 +147,7 @@ github.com/golang-jwt/jwt/v4 v4.5.0 h1:7cYmW1XlMY7h7ii7UhUyChSgS5wUJEnm9uZVTGqOW
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 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/pquerna/cachecontrol v0.1.0/go.mod h1:NrUG3Z7Rdu85UNR3vm7SOsl1nFIeSiQnrHV5K9mBcUI=
 github.com/prometheus/client_golang v1.20.3 h1:oPksm4K8B+Vt35tUhw6GbSNSgVlVSBH0qELP/7u83l4=
 github.com/prometheus/client_golang v1.20.3/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/jReSnHgO035n//V5WE=
 github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
@@ -219,6 +244,7 @@ github.com/prometheus/common v0.56.0 h1:UffReloqkBtvtQEYDg2s+uDPGRrJyC6vZWPGXf6O
 github.com/prometheus/common v0.56.0/go.mod h1:7uRPFSUTbfZWsJ7MHY56sqt7hLQu3bxXHDnNhl8E9qI=
 github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
 github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
+github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
 github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
@@ -239,6 +265,7 @@ github.com/stoewer/go-strcase v1.2.0/go.mod h1:IBiWB2sKIp3wVVQ3Y035++gc+knqhUQag
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
@@ -253,6 +280,7 @@ github.com/tmc/grpc-websocket-proxy v0.0.0-20220101234140-673ab2c3ae75 h1:6fotK7
 github.com/tmc/grpc-websocket-proxy v0.0.0-20220101234140-673ab2c3ae75/go.mod h1:KO6IkyS8Y3j8OdNO85qEYBsRPuteD+YciPomcXdrMnk=
 github.com/x448/float16 v0.8.4 h1:qLwI1I70+NjRFUR3zs1JPUCgaCXSh3SW62uAKT1mSBM=
 github.com/x448/float16 v0.8.4/go.mod h1:14CWIYCyZA/cWjXOioeEpHeN/83MdbZDRQHoFcYsOfg=
+github.com/xhit/go-str2duration/v2 v2.1.0/go.mod h1:ohY8p+0f07DiV6Em5LKB0s2YpLtXVyJfNt1+BlmyAsU=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 h1:eY9dn8+vbi4tKz5Qo6v2eYzo7kUS51QINcR5jNpbZS8=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
@@ -296,6 +324,7 @@ go.opentelemetry.io/otel/trace v1.29.0 h1:J/8ZNK4XgR7a21DZUAsbF8pZ5Jcw1VhACmnYt3
 go.opentelemetry.io/otel/trace v1.29.0/go.mod h1:eHl3w0sp3paPkYstJOmAimxhiFXPg+MMTlEh3nsQgWQ=
 go.opentelemetry.io/proto/otlp v1.3.1 h1:TrMUixzpM0yuc/znrFTP9MMRh8trP93mkCiDVeXrui0=
 go.opentelemetry.io/proto/otlp v1.3.1/go.mod h1:0X1WI4de4ZsLrrJNLAQbFeLCm3T7yBkR0XqQ7niQU+8=
+go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
 go.uber.org/mock v0.4.0 h1:VcM4ZOtdbR4f6VXfiOpwpVJDL6lCReaZ6mw31wqh7KU=
@@ -319,6 +348,7 @@ golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.20.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191112182307-2180aed22343/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
@@ -356,6 +386,7 @@ golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
 golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/telemetry v0.0.0-20240521205824-bda55230c457/go.mod h1:pRgIJT+bRLFKnoM1ldnzKoxTIn14Yxz928LQRYYgIN0=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
@@ -387,6 +418,8 @@ golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
+google.golang.org/appengine v1.6.7/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
 google.golang.org/genproto v0.0.0-20230822172742-b8732ec3820d h1:VBu5YqKPv6XiJ199exd8Br+Aetz+o08F+PLMnwJQHAY=
 google.golang.org/genproto v0.0.0-20230822172742-b8732ec3820d/go.mod h1:yZTlhN0tQnXo3h00fuXNCxJdLdIdnVFVBaRJ5LWBbw4=
 google.golang.org/genproto/googleapis/api v0.0.0-20240701130421-f6361c86f094 h1:0+ozOGcrp+Y8Aq8TLNN2Aliibms5LEzsq99ZZmAGYm0=
@@ -409,6 +442,7 @@ gopkg.in/inf.v0 v0.9.1 h1:73M5CoZyi3ZLMOyDlQh031Cx6N9NDJ2Vvfl76EDAgDc=
 gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/natefinch/lumberjack.v2 v2.2.1 h1:bBRl1b0OH9s/DuPhuXpNl+VtCaJXFZ5/uEFST95x9zc=
 gopkg.in/natefinch/lumberjack.v2 v2.2.1/go.mod h1:YD8tP3GAjkrDg1eZH7EGmyESg/lsYskCTPBJVb9jqSc=
+gopkg.in/square/go-jose.v2 v2.6.0/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
@@ -432,6 +466,7 @@ k8s.io/component-helpers v0.30.4 h1:A4KYmrz12HZtGZ8TAnanl0SUx7n6tKduxzB3NHvinr0=
 k8s.io/component-helpers v0.30.4/go.mod h1:h5D4gI8hGQXMHw90qJq41PRUJrn2dvFA3ElZFUTzRps=
 k8s.io/controller-manager v0.30.4 h1:PdAGa5srv9fTECbBtWeaLshNpy//hGHHpXjRkh1wOkQ=
 k8s.io/controller-manager v0.30.4/go.mod h1:fTVfW8X0yJh+pUuybc45WxyoLQEhJqJjSff6/2b+l3I=
+k8s.io/gengo/v2 v2.0.0-20240228010128-51d4e06bde70/go.mod h1:VH3AT8AaQOqiGjMF9p0/IM1Dj+82ZwjfxUP1IxaHE+8=
 k8s.io/klog/v2 v2.130.1 h1:n9Xl7H1Xvksem4KFG4PYbdQCQxqc/tTUyrgXaOhHSzk=
 k8s.io/klog/v2 v2.130.1/go.mod h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE=
 k8s.io/kms v0.30.4 h1:Je7wR5/m+w/E7Ef9R9RY1yeMU/C2GXIvhzRFfg8H5kQ=
diff --git a/pkg/provider/azure_loadbalancer.go b/pkg/provider/azure_loadbalancer.go
index 53e4a33a0..7625e4f55 100644
--- a/pkg/provider/azure_loadbalancer.go
+++ b/pkg/provider/azure_loadbalancer.go
@@ -1650,7 +1650,7 @@ func (az *Cloud) reconcileMultipleStandardLoadBalancerConfigurations(
 		}
 	}
 
-	return az.reconcileMultipleStandardLoadBalancerBackendNodes("", lbs, service, nodes)
+	return az.reconcileMultipleStandardLoadBalancerBackendNodes(clusterName, "", lbs, service, nodes, true)
 }
 
 // reconcileLoadBalancer ensures load balancer exists and the frontend ip config is setup.
@@ -1852,7 +1852,7 @@ func (az *Cloud) reconcileLoadBalancer(ctx context.Context, clusterName string,
 		}()
 
 		if az.useMultipleStandardLoadBalancers() {
-			err := az.reconcileMultipleStandardLoadBalancerBackendNodes(lbName, existingLBs, service, nodes)
+			err := az.reconcileMultipleStandardLoadBalancerBackendNodes(clusterName, lbName, existingLBs, service, nodes, false)
 			if err != nil {
 				return nil, err
 			}
@@ -2151,11 +2151,27 @@ func isLBInList(lbs *[]network.LoadBalancer, lbConfigName string) bool {
 // 2. We only check nodes that are not matched by primary vmSet before we ensure
 // hosts in pool. So the number API calls is under control.
 func (az *Cloud) reconcileMultipleStandardLoadBalancerBackendNodes(
+	clusterName string,
 	lbName string,
 	lbs *[]network.LoadBalancer,
 	service *v1.Service,
 	nodes []*v1.Node,
+	init bool,
 ) error {
+	logger := klog.Background().WithName("reconcileMultipleStandardLoadBalancerBackendNodes").
+		WithValues(
+			"clusterName", clusterName,
+			"lbName", lbName,
+			"service", service.Name,
+			"init", init,
+		)
+	if init {
+		if err := az.recordExistingNodesOnLoadBalancers(clusterName, lbs); err != nil {
+			logger.Error(err, "failed to record existing nodes on load balancers")
+			return err
+		}
+	}
+
 	// Remove the nodes from the load balancer configurations if they are not in the node list.
 	nodeNameToLBConfigIDXMap := az.removeDeletedNodesFromLoadBalancerConfigurations(nodes)
 
@@ -2172,6 +2188,38 @@ func (az *Cloud) reconcileMultipleStandardLoadBalancerBackendNodes(
 	return nil
 }
 
+// recordExistingNodesOnLoadBalancers restores the node distribution
+// across multiple load balancers each time the cloud provider restarts.
+func (az *Cloud) recordExistingNodesOnLoadBalancers(clusterName string, lbs *[]network.LoadBalancer) error {
+	bi, ok := az.LoadBalancerBackendPool.(*backendPoolTypeNodeIP)
+	if !ok {
+		return errors.New("must use backend pool type nodeIP")
+	}
+	bpNames := getBackendPoolNames(clusterName)
+	for _, lb := range *lbs {
+		if lb.LoadBalancerPropertiesFormat == nil ||
+			lb.LoadBalancerPropertiesFormat.BackendAddressPools == nil {
+			continue
+		}
+		lbName := ptr.Deref(lb.Name, "")
+		for _, backendPool := range *lb.LoadBalancerPropertiesFormat.BackendAddressPools {
+			backendPool := backendPool
+			if found, _ := isLBBackendPoolsExisting(bpNames, backendPool.Name); found {
+				nodeNames := bi.getBackendPoolNodeNames(&backendPool)
+				for i, multiSLBConfig := range az.MultipleStandardLoadBalancerConfigurations {
+					if strings.EqualFold(trimSuffixIgnoreCase(
+						lbName, consts.InternalLoadBalancerNameSuffix,
+					), multiSLBConfig.Name) {
+						az.MultipleStandardLoadBalancerConfigurations[i].ActiveNodes =
+							utilsets.SafeInsert(multiSLBConfig.ActiveNodes, nodeNames...)
+					}
+				}
+			}
+		}
+	}
+	return nil
+}
+
 func (az *Cloud) reconcileMultipleStandardLoadBalancerConfigurationStatus(wantLb bool, svcName, lbName string) {
 	lbName = trimSuffixIgnoreCase(lbName, consts.InternalLoadBalancerNameSuffix)
 	for i := range az.MultipleStandardLoadBalancerConfigurations {
diff --git a/pkg/provider/azure_loadbalancer_backendpool.go b/pkg/provider/azure_loadbalancer_backendpool.go
index 992059b7f..ee319d022 100644
--- a/pkg/provider/azure_loadbalancer_backendpool.go
+++ b/pkg/provider/azure_loadbalancer_backendpool.go
@@ -774,6 +774,20 @@ func (bi *backendPoolTypeNodeIP) GetBackendPrivateIPs(clusterName string, servic
 	return backendPrivateIPv4s.UnsortedList(), backendPrivateIPv6s.UnsortedList()
 }
 
+// getBackendPoolNameForService returns all node names in the backend pool.
+func (bi *backendPoolTypeNodeIP) getBackendPoolNodeNames(bp *network.BackendAddressPool) []string {
+	nodeNames := utilsets.NewString()
+	if bp.BackendAddressPoolPropertiesFormat != nil && bp.LoadBalancerBackendAddresses != nil {
+		for _, backendAddress := range *bp.LoadBalancerBackendAddresses {
+			if backendAddress.LoadBalancerBackendAddressPropertiesFormat != nil {
+				ip := pointer.StringDeref(backendAddress.IPAddress, "")
+				nodeNames.Insert(bi.nodePrivateIPToNodeNameMap[ip])
+			}
+		}
+	}
+	return nodeNames.UnsortedList()
+}
+
 func newBackendPool(lb *network.LoadBalancer, isBackendPoolPreConfigured bool, preConfiguredBackendPoolLoadBalancerTypes, serviceName, lbBackendPoolName string) bool {
 	if isBackendPoolPreConfigured {
 		klog.V(2).Infof("newBackendPool for service (%s)(true): lb backendpool - PreConfiguredBackendPoolLoadBalancerTypes %s has been set but can not find corresponding backend pool %q, ignoring it",


Test patch:
diff --git a/pkg/provider/azure_loadbalancer_test.go b/pkg/provider/azure_loadbalancer_test.go
index efc821252..46dd26709 100644
--- a/pkg/provider/azure_loadbalancer_test.go
+++ b/pkg/provider/azure_loadbalancer_test.go
@@ -43,6 +43,7 @@ import (
 	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/client-go/kubernetes/fake"
 	"k8s.io/utils/pointer"
+	"k8s.io/utils/ptr"
 
 	"sigs.k8s.io/cloud-provider-azure/pkg/azureclients/loadbalancerclient/mockloadbalancerclient"
 	"sigs.k8s.io/cloud-provider-azure/pkg/azureclients/privatelinkserviceclient/mockprivatelinkserviceclient"
@@ -7599,6 +7600,7 @@ func TestReconcileMultipleStandardLoadBalancerConfigurations(t *testing.T) {
 			}
 
 			if tc.useMultipleLB {
+				az.LoadBalancerBackendPool = newBackendPoolTypeNodeIP(az)
 				az.MultipleStandardLoadBalancerConfigurations = []MultipleStandardLoadBalancerConfiguration{
 					{Name: "lb1"},
 					{Name: "lb2"},
@@ -8076,6 +8078,7 @@ func TestReconcileMultipleStandardLoadBalancerNodes(t *testing.T) {
 	for _, tc := range []struct {
 		description          string
 		lbName               string
+		init                 bool
 		existingLBConfigs    []MultipleStandardLoadBalancerConfiguration
 		existingNodes        []*v1.Node
 		existingLBs          []network.LoadBalancer
@@ -8424,6 +8427,89 @@ func TestReconcileMultipleStandardLoadBalancerNodes(t *testing.T) {
 				"lb4": nil,
 			},
 		},
+		{
+			description: "should record current node distributions after restarting the controller",
+			init:        true,
+			existingLBConfigs: []MultipleStandardLoadBalancerConfiguration{
+				{
+					Name: "lb1",
+					MultipleStandardLoadBalancerConfigurationSpec: MultipleStandardLoadBalancerConfigurationSpec{
+						PrimaryVMSet: "vmss-1",
+					},
+				},
+				{
+					Name: "lb2",
+					MultipleStandardLoadBalancerConfigurationSpec: MultipleStandardLoadBalancerConfigurationSpec{
+						PrimaryVMSet: "vmss-2",
+					},
+				},
+			},
+			existingNodes: []*v1.Node{
+				getTestNodeWithMetadata("node1", "vmss-1", map[string]string{"k1": "v1"}, "10.1.0.1"),
+				getTestNodeWithMetadata("node2", "vmss-2", map[string]string{"k3": "v3"}, "10.1.0.2"),
+				getTestNodeWithMetadata("node3", "vmss-3", map[string]string{"k2": "v2"}, "10.1.0.3"),
+				getTestNodeWithMetadata("node5", "vmss-5", map[string]string{"k2": "v2"}, "10.1.0.5"),
+				getTestNodeWithMetadata("node6", "vmss-6", map[string]string{"k3": "v3"}, "10.1.0.6"),
+			},
+			existingLBs: []network.LoadBalancer{
+				{
+					Name: pointer.StringPtr("lb1-internal"),
+					LoadBalancerPropertiesFormat: &network.LoadBalancerPropertiesFormat{
+						BackendAddressPools: &[]network.BackendAddressPool{
+							{
+								Name: ptr.To("kubernetes"),
+								BackendAddressPoolPropertiesFormat: &network.BackendAddressPoolPropertiesFormat{
+									LoadBalancerBackendAddresses: &[]network.LoadBalancerBackendAddress{
+										{
+											Name: ptr.To("node2"),
+											LoadBalancerBackendAddressPropertiesFormat: &network.LoadBalancerBackendAddressPropertiesFormat{
+												IPAddress: ptr.To("10.1.0.2"),
+											},
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+				{
+					Name: ptr.To("lb2"),
+					LoadBalancerPropertiesFormat: &network.LoadBalancerPropertiesFormat{
+						BackendAddressPools: &[]network.BackendAddressPool{
+							{
+								Name: ptr.To("kubernetes"),
+								BackendAddressPoolPropertiesFormat: &network.BackendAddressPoolPropertiesFormat{
+									LoadBalancerBackendAddresses: &[]network.LoadBalancerBackendAddress{
+										{
+											Name: ptr.To("node3"),
+											LoadBalancerBackendAddressPropertiesFormat: &network.LoadBalancerBackendAddressPropertiesFormat{
+												IPAddress: ptr.To("10.1.0.3"),
+											},
+										},
+										{
+											Name: ptr.To("node4"),
+											LoadBalancerBackendAddressPropertiesFormat: &network.LoadBalancerBackendAddressPropertiesFormat{
+												IPAddress: ptr.To("10.1.0.4"),
+											},
+										},
+										{
+											Name: ptr.To("node5"),
+											LoadBalancerBackendAddressPropertiesFormat: &network.LoadBalancerBackendAddressPropertiesFormat{
+												IPAddress: ptr.To("10.1.0.5"),
+											},
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+			expectedLBToNodesMap: map[string]*utilsets.IgnoreCaseSet{
+				"lb1": utilsets.NewString("node1", "node6"),
+				"lb2": utilsets.NewString("node2", "node3", "node5"),
+			},
+		},
 	} {
 		tc := tc
 		t.Run(tc.description, func(t *testing.T) {
@@ -8431,9 +8517,18 @@ func TestReconcileMultipleStandardLoadBalancerNodes(t *testing.T) {
 			ss, _ := NewTestScaleSet(ctrl)
 			ss.DisableAvailabilitySetNodes = true
 			az.VMSet = ss
+			az.nodePrivateIPToNodeNameMap = map[string]string{
+				"10.1.0.1": "node1",
+				"10.1.0.2": "node2",
+				"10.1.0.3": "node3",
+				"10.1.0.4": "node4",
+				"10.1.0.5": "node5",
+				"10.1.0.6": "node6",
+			}
+			az.LoadBalancerBackendPool = newBackendPoolTypeNodeIP(az)
 			az.MultipleStandardLoadBalancerConfigurations = tc.existingLBConfigs
 			svc := getTestService("test", v1.ProtocolTCP, nil, false)
-			_ = az.reconcileMultipleStandardLoadBalancerBackendNodes(tc.lbName, &tc.existingLBs, &svc, tc.existingNodes)
+			_ = az.reconcileMultipleStandardLoadBalancerBackendNodes("kubernetes", tc.lbName, &tc.existingLBs, &svc, tc.existingNodes, tc.init)
 
 			expectedLBToNodesMap := make(map[string]*utilsets.IgnoreCaseSet)
 			for _, multiSLBConfig := range az.MultipleStandardLoadBalancerConfigurations {