Make aws cloud provider report a node hostname address

pkg/cloudprovider/providers/aws/aws.go

@@ -1245,6 +1245,7 @@ func (c *Cloud) NodeAddresses(ctx context.Context, name types.NodeName) ([]v1.No
 			glog.V(4).Info("Could not determine private DNS from AWS metadata.")
 		} else {
 			addresses = append(addresses, v1.NodeAddress{Type: v1.NodeInternalDNS, Address: internalDNS})
+			addresses = append(addresses, v1.NodeAddress{Type: v1.NodeHostName, Address: internalDNS})
 		}
 
 		externalDNS, err := c.metadata.GetMetadata("public-hostname")
@@ -1307,6 +1308,7 @@ func extractNodeAddresses(instance *ec2.Instance) ([]v1.NodeAddress, error) {
 	privateDNSName := aws.StringValue(instance.PrivateDnsName)
 	if privateDNSName != "" {
 		addresses = append(addresses, v1.NodeAddress{Type: v1.NodeInternalDNS, Address: privateDNSName})
+		addresses = append(addresses, v1.NodeAddress{Type: v1.NodeHostName, Address: privateDNSName})
 	}
 
 	publicDNSName := aws.StringValue(instance.PublicDnsName)

pkg/cloudprovider/providers/aws/aws_test.go

@@ -348,13 +348,14 @@ func TestNodeAddresses(t *testing.T) {
 	if err3 != nil {
 		t.Errorf("Should not error when instance found")
 	}
-	if len(addrs3) != 4 {
-		t.Errorf("Should return exactly 4 NodeAddresses")
+	if len(addrs3) != 5 {
+		t.Errorf("Should return exactly 5 NodeAddresses")
 	}
 	testHasNodeAddress(t, addrs3, v1.NodeInternalIP, "192.168.0.1")
 	testHasNodeAddress(t, addrs3, v1.NodeExternalIP, "1.2.3.4")
 	testHasNodeAddress(t, addrs3, v1.NodeExternalDNS, "instance-same.ec2.external")
 	testHasNodeAddress(t, addrs3, v1.NodeInternalDNS, "instance-same.ec2.internal")
+	testHasNodeAddress(t, addrs3, v1.NodeHostName, "instance-same.ec2.internal")
 }
 
 func TestNodeAddressesWithMetadata(t *testing.T) {