Adding a check to make sure Metadata is read only if flag value is true.

pkg/cloudprovider/providers/azure/azure_test.go

@@ -1676,7 +1676,8 @@ func validateEmptyConfig(t *testing.T, config string) {
 func TestGetZone(t *testing.T) {
 	cloud := &Cloud{
 		Config: Config{
-			Location: "eastus",
+			Location:            "eastus",
+			UseInstanceMetadata: true,
 		},
 	}
 	testcases := []struct {

pkg/cloudprovider/providers/azure/azure_zones.go

@@ -19,6 +19,7 @@ package azure
 import (
 	"context"
 	"fmt"
+	"os"
 	"strconv"
 	"strings"
 
@@ -49,31 +50,39 @@ func (az *Cloud) GetZoneID(zoneLabel string) string {
 // GetZone returns the Zone containing the current availability zone and locality region that the program is running in.
 // If the node is not running with availability zones, then it will fall back to fault domain.
 func (az *Cloud) GetZone(ctx context.Context) (cloudprovider.Zone, error) {
-	metadata, err := az.metadata.GetMetadata()
-	if err != nil {
-		return cloudprovider.Zone{}, err
-	}
+	if az.UseInstanceMetadata {
+		metadata, err := az.metadata.GetMetadata()
+		if err != nil {
+			return cloudprovider.Zone{}, err
+		}
 
-	if metadata.Compute == nil {
-		return cloudprovider.Zone{}, fmt.Errorf("failure of getting compute information from instance metadata")
-	}
+		if metadata.Compute == nil {
+			return cloudprovider.Zone{}, fmt.Errorf("failure of getting compute information from instance metadata")
+		}
 
-	zone := ""
-	if metadata.Compute.Zone != "" {
-		zoneID, err := strconv.Atoi(metadata.Compute.Zone)
-		if err != nil {
-			return cloudprovider.Zone{}, fmt.Errorf("failed to parse zone ID %q: %v", metadata.Compute.Zone, err)
+		zone := ""
+		if metadata.Compute.Zone != "" {
+			zoneID, err := strconv.Atoi(metadata.Compute.Zone)
+			if err != nil {
+				return cloudprovider.Zone{}, fmt.Errorf("failed to parse zone ID %q: %v", metadata.Compute.Zone, err)
+			}
+			zone = az.makeZone(zoneID)
+		} else {
+			klog.V(3).Infof("Availability zone is not enabled for the node, falling back to fault domain")
+			zone = metadata.Compute.FaultDomain
 		}
-		zone = az.makeZone(zoneID)
-	} else {
-		klog.V(3).Infof("Availability zone is not enabled for the node, falling back to fault domain")
-		zone = metadata.Compute.FaultDomain
-	}
 
-	return cloudprovider.Zone{
-		FailureDomain: zone,
-		Region:        az.Location,
-	}, nil
+		return cloudprovider.Zone{
+			FailureDomain: zone,
+			Region:        az.Location,
+		}, nil
+	}
+	// if UseInstanceMetadata is false, get Zone name by calling ARM
+	hostname, err := os.Hostname()
+	if err != nil {
+		return cloudprovider.Zone{}, fmt.Errorf("failure getting hostname from kernel")
+	}
+	return az.vmSet.GetZoneByNodeName(strings.ToLower(hostname))
 }
 
 // GetZoneByProviderID implements Zones.GetZoneByProviderID