First stab at extending the "uid" configmap to store firewall

rule information.

controllers/gce/controller/controller.go

@@ -46,6 +46,10 @@ var (
 	// L7 controller created without specifying the --cluster-uid flag.
 	DefaultClusterUID = ""
 
+	// DefaultFirewallName is the name to user for firewall rules created
+	// by an L7 controller when the --fireall-rule is not used.
+	DefaultFirewallName = ""
+
 	// Frequency to poll on local stores to sync.
 	storeSyncPollPeriod = 5 * time.Second
 )

controllers/gce/controller/controller_test.go

@@ -199,7 +199,8 @@ func addIngress(lbc *LoadBalancerController, ing *extensions.Ingress, pm *nodePo
 }
 
 func TestLbCreateDelete(t *testing.T) {
-	cm := NewFakeClusterManager(DefaultClusterUID)
+	testFirewallName := "quux"
+	cm := NewFakeClusterManager(DefaultClusterUID, testFirewallName)
 	lbc := newLoadBalancerController(t, cm, "")
 	inputMap1 := map[string]utils.FakeIngressRuleValueMap{
 		"foo.example.com": {
@@ -240,6 +241,7 @@ func TestLbCreateDelete(t *testing.T) {
 	unexpected := []int{pm.portMap["foo2svc"], pm.portMap["bar2svc"]}
 	expected := []int{pm.portMap["foo1svc"], pm.portMap["bar1svc"]}
 	firewallPorts := sets.NewString()
+	pm.namer.SetFirewallName(testFirewallName)
 	firewallName := pm.namer.FrName(pm.namer.FrSuffix())
 
 	if firewallRule, err := cm.firewallPool.(*firewalls.FirewallRules).GetFirewall(firewallName); err != nil {
@@ -290,7 +292,7 @@ func TestLbCreateDelete(t *testing.T) {
 }
 
 func TestLbFaultyUpdate(t *testing.T) {
-	cm := NewFakeClusterManager(DefaultClusterUID)
+	cm := NewFakeClusterManager(DefaultClusterUID, DefaultFirewallName)
 	lbc := newLoadBalancerController(t, cm, "")
 	inputMap := map[string]utils.FakeIngressRuleValueMap{
 		"foo.example.com": {
@@ -327,7 +329,7 @@ func TestLbFaultyUpdate(t *testing.T) {
 }
 
 func TestLbDefaulting(t *testing.T) {
-	cm := NewFakeClusterManager(DefaultClusterUID)
+	cm := NewFakeClusterManager(DefaultClusterUID, DefaultFirewallName)
 	lbc := newLoadBalancerController(t, cm, "")
 	// Make sure the controller plugs in the default values accepted by GCE.
 	ing := newIngress(map[string]utils.FakeIngressRuleValueMap{"": {"": "foo1svc"}})
@@ -345,7 +347,7 @@ func TestLbDefaulting(t *testing.T) {
 }
 
 func TestLbNoService(t *testing.T) {
-	cm := NewFakeClusterManager(DefaultClusterUID)
+	cm := NewFakeClusterManager(DefaultClusterUID, DefaultFirewallName)
 	lbc := newLoadBalancerController(t, cm, "")
 	inputMap := map[string]utils.FakeIngressRuleValueMap{
 		"foo.example.com": {
@@ -389,7 +391,7 @@ func TestLbNoService(t *testing.T) {
 }
 
 func TestLbChangeStaticIP(t *testing.T) {
-	cm := NewFakeClusterManager(DefaultClusterUID)
+	cm := NewFakeClusterManager(DefaultClusterUID, DefaultFirewallName)
 	lbc := newLoadBalancerController(t, cm, "")
 	inputMap := map[string]utils.FakeIngressRuleValueMap{
 		"foo.example.com": {

controllers/gce/controller/fakes.go

@@ -44,12 +44,12 @@ type fakeClusterManager struct {
 }
 
 // NewFakeClusterManager creates a new fake ClusterManager.
-func NewFakeClusterManager(clusterName string) *fakeClusterManager {
+func NewFakeClusterManager(clusterName, firewallName string) *fakeClusterManager {
 	fakeLbs := loadbalancers.NewFakeLoadBalancers(clusterName)
 	fakeBackends := backends.NewFakeBackendServices(func(op int, be *compute.BackendService) error { return nil })
 	fakeIGs := instances.NewFakeInstanceGroups(sets.NewString())
 	fakeHCs := healthchecks.NewFakeHealthChecks()
-	namer := utils.NewNamer(clusterName)
+	namer := utils.NewNamerWithFirewall(clusterName, firewallName)
 
 	nodePool := instances.NewNodePool(fakeIGs)
 	nodePool.Init(&instances.FakeZoneLister{Zones: []string{"zone-a"}})

controllers/gce/controller/util_test.go

@@ -32,7 +32,7 @@ import (
 var firstPodCreationTime = time.Date(2006, 01, 02, 15, 04, 05, 0, time.UTC)
 
 func TestZoneListing(t *testing.T) {
-	cm := NewFakeClusterManager(DefaultClusterUID)
+	cm := NewFakeClusterManager(DefaultClusterUID, DefaultFirewallName)
 	lbc := newLoadBalancerController(t, cm, "")
 	zoneToNode := map[string][]string{
 		"zone-1": {"n1"},
@@ -57,7 +57,7 @@ func TestZoneListing(t *testing.T) {
 }
 
 func TestInstancesAddedToZones(t *testing.T) {
-	cm := NewFakeClusterManager(DefaultClusterUID)
+	cm := NewFakeClusterManager(DefaultClusterUID, DefaultFirewallName)
 	lbc := newLoadBalancerController(t, cm, "")
 	zoneToNode := map[string][]string{
 		"zone-1": {"n1", "n2"},
@@ -92,7 +92,7 @@ func TestInstancesAddedToZones(t *testing.T) {
 }
 
 func TestProbeGetter(t *testing.T) {
-	cm := NewFakeClusterManager(DefaultClusterUID)
+	cm := NewFakeClusterManager(DefaultClusterUID, DefaultFirewallName)
 	lbc := newLoadBalancerController(t, cm, "")
 	nodePortToHealthCheck := map[int64]string{
 		3001: "/healthz",
@@ -110,7 +110,7 @@ func TestProbeGetter(t *testing.T) {
 }
 
 func TestProbeGetterNamedPort(t *testing.T) {
-	cm := NewFakeClusterManager(DefaultClusterUID)
+	cm := NewFakeClusterManager(DefaultClusterUID, DefaultFirewallName)
 	lbc := newLoadBalancerController(t, cm, "")
 	nodePortToHealthCheck := map[int64]string{
 		3001: "/healthz",
@@ -133,7 +133,7 @@ func TestProbeGetterNamedPort(t *testing.T) {
 }
 
 func TestProbeGetterCrossNamespace(t *testing.T) {
-	cm := NewFakeClusterManager(DefaultClusterUID)
+	cm := NewFakeClusterManager(DefaultClusterUID, DefaultFirewallName)
 	lbc := newLoadBalancerController(t, cm, "")
 
 	firstPod := &api.Pod{

controllers/gce/main.go

@@ -215,7 +215,7 @@ func main() {
 
 	if *inCluster || *useRealCloud {
 		// Create cluster manager
-		namer, err := newNamer(kubeClient, *clusterName)
+		namer, err := newNamer(kubeClient, *clusterName, controller.DefaultFirewallName)
 		if err != nil {
 			glog.Fatalf("%v", err)
 		}
@@ -225,7 +225,7 @@ func main() {
 		}
 	} else {
 		// Create fake cluster manager
-		clusterManager = controller.NewFakeClusterManager(*clusterName).ClusterManager
+		clusterManager = controller.NewFakeClusterManager(*clusterName, controller.DefaultFirewallName).ClusterManager
 	}
 
 	// Start loadbalancer controller
@@ -247,32 +247,95 @@ func main() {
 	}
 }
 
-func newNamer(kubeClient client.Interface, clusterName string) (*utils.Namer, error) {
+func newNamer(kubeClient client.Interface, clusterName string, fwName string) (*utils.Namer, error) {
 	name, err := getClusterUID(kubeClient, clusterName)
 	if err != nil {
 		return nil, err
 	}
+	fw_name, err := getFirewallName(kubeClient, fwName, name)
+	if err != nil {
+		return nil, err
+	}
 
-	namer := utils.NewNamer(name)
+	namer := utils.NewNamerWithFirewall(name, fw_name)
-	vault := storage.NewConfigMapVault(kubeClient, api.NamespaceSystem, uidConfigMapName)
+	uidVault := storage.NewConfigMapVault(kubeClient, api.NamespaceSystem, uidConfigMapName)
 
 	// Start a goroutine to poll the cluster UID config map
 	// We don't watch because we know exactly which configmap we want and this
 	// controller already watches 5 other resources, so it isn't worth the cost
 	// of another connection and complexity.
 	go wait.Forever(func() {
-		uid, found, err := vault.Get()
+		for _, key := range [...]string{storage.UidDataKey, storage.ProviderDataKey} {
-		existing := namer.GetClusterName()
+			val, found, err := uidVault.Get(key)
-		if found && uid != existing {
+			if err != nil {
-			glog.Infof("Cluster uid changed from %v -> %v", existing, uid)
+				glog.Errorf("Can't read uidConfigMap %v", uidConfigMapName)
-			namer.SetClusterName(uid)
+			} else if !found {
-		} else if err != nil {
+				glog.Errorf("Can't read %v from uidConfigMap %v", key, uidConfigMapName)
-			glog.Errorf("Failed to reconcile cluster uid %v, currently set to %v", err, existing)
+				continue
+			}
+
+			switch key {
+			case storage.UidDataKey:
+				if uid := namer.GetClusterName(); uid != val {
+					glog.Infof("Cluster uid changed from %v -> %v", uid, val)
+					namer.SetClusterName(val)
+				}
+			case storage.ProviderDataKey:
+				if fw_name := namer.GetFirewallName(); fw_name != val {
+					glog.Infof("Cluster firewall name changed from %v -> %v", fw_name, val)
+					namer.SetFirewallName(val)
+				}
+			}
 		}
 	}, 5*time.Second)
 	return namer, nil
 }
 
+// getFlagOrLookupVault returns the name to use associated to a flag and configmap.
+// The returned value follows this priority:
+// If the provided 'name' is not empty, that name is used.
+//       This is effectively a client override via a command line flag.
+// else, check configmap under 'configmap_name' as a key and if found, use the associated value
+// else, return an empty 'name' and pass along an error iff the configmap lookup is erroneous.
+func getFlagOrLookupVault(cfgVault *storage.ConfigMapVault, cm_key string, name string) (string, error) {
+	if name != "" {
+		glog.Infof("Using user provided %v %v", cm_key, name)
+		// Don't save the uid in the vault, so users can rollback through
+		// setting the accompany flag to ""
+		return name, nil
+	}
+	val, found, err := cfgVault.Get(cm_key)
+	if found {
+		glog.Infof("Using %v = %q saved in ConfigMap", cm_key, val)
+		return val, nil
+	} else if err != nil {
+		// This can fail because of:
+		// 1. No such config map - found=false, err=nil
+		// 2. No such key in config map - found=false, err=nil
+		// 3. Apiserver flake - found=false, err!=nil
+		// It is not safe to proceed in 3.
+		return "", fmt.Errorf("Failed to retrieve %v: %v, using %q as name", cm_key, err, name)
+	}
+	// Not found but safe to proceed.
+	return "", nil
+}
+
+// getFirewallName returns the firewall rule name to use for this cluster. For
+// backwards compatibility, the firewall name will default to the cluster UID.
+// Use getFlagOrLookupVault to obtain a stored or overridden value for the firewall name.
+// else, use the cluster UID as a backup (this retains backwards compatibility).
+func getFirewallName(kubeClient client.Interface, name string, cluster_uid string) (string, error) {
+	cfgVault := storage.NewConfigMapVault(kubeClient, api.NamespaceSystem, uidConfigMapName)
+	if fw_name, err := getFlagOrLookupVault(cfgVault, storage.ProviderDataKey, name); err != nil {
+		return "", err
+	} else if fw_name != "" {
+		return fw_name, cfgVault.Put(storage.ProviderDataKey, fw_name)
+	} else {
+		glog.Infof("Using cluster UID %v as firewall name", cluster_uid)
+		return cluster_uid, cfgVault.Put(storage.ProviderDataKey, cluster_uid)
+	}
+}
+
 // getClusterUID returns the cluster UID. Rules for UID generation:
 // If the user specifies a --cluster-uid param it overwrites everything
 // else, check UID config map for a previously recorded uid
@@ -281,26 +344,12 @@ func newNamer(kubeClient client.Interface, clusterName string) (*utils.Namer, er
 // else, allocate a new uid
 func getClusterUID(kubeClient client.Interface, name string) (string, error) {
 	cfgVault := storage.NewConfigMapVault(kubeClient, api.NamespaceSystem, uidConfigMapName)
-	if name != "" {
+	if name, err := getFlagOrLookupVault(cfgVault, storage.UidDataKey, name); err != nil {
-		glog.Infof("Using user provided cluster uid %v", name)
+		return "", err
-		// Don't save the uid in the vault, so users can rollback through
+	} else if name != "" {
-		// --cluster-uid=""
 		return name, nil
 	}
 
-	existingUID, found, err := cfgVault.Get()
-	if found {
-		glog.Infof("Using saved cluster uid %q", existingUID)
-		return existingUID, nil
-	} else if err != nil {
-		// This can fail because of:
-		// 1. No such config map - found=false, err=nil
-		// 2. No such key in config map - found=false, err=nil
-		// 3. Apiserver flake - found=false, err!=nil
-		// It is not safe to proceed in 3.
-		return "", fmt.Errorf("Failed to retrieve current uid: %v, using %q as name", err, name)
-	}
-
 	// Check if the cluster has an Ingress with ip
 	ings, err := kubeClient.Extensions().Ingresses(api.NamespaceAll).List(api.ListOptions{LabelSelector: labels.Everything()})
 	if err != nil {
@@ -311,10 +360,10 @@ func getClusterUID(kubeClient client.Interface, name string) (string, error) {
 		if len(ing.Status.LoadBalancer.Ingress) != 0 {
 			c := namer.ParseName(loadbalancers.GCEResourceName(ing.Annotations, "forwarding-rule"))
 			if c.ClusterName != "" {
-				return c.ClusterName, cfgVault.Put(c.ClusterName)
+				return c.ClusterName, cfgVault.Put(storage.UidDataKey, c.ClusterName)
 			}
 			glog.Infof("Found a working Ingress, assuming uid is empty string")
-			return "", cfgVault.Put("")
+			return "", cfgVault.Put(storage.UidDataKey, "")
 		}
 	}
 
@@ -329,7 +378,7 @@ func getClusterUID(kubeClient client.Interface, name string) (string, error) {
 		return "", err
 	}
 	uid := fmt.Sprintf("%x", b)
-	return uid, cfgVault.Put(uid)
+	return uid, cfgVault.Put(storage.UidDataKey, uid)
 }
 
 // getNodePort waits for the Service, and returns it's first node port.

controllers/gce/storage/configmaps.go

@@ -19,6 +19,7 @@ package storage
 import (
 	"fmt"
 	"strings"
+	"sync"
 
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/api"
@@ -27,73 +28,86 @@ import (
 	client "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
 )
 
-// UIDVault stores UIDs.
+const (
-type UIDVault interface {
+	// UidDataKey is the key used in config maps to store the UID.
-	Get() (string, bool, error)
+	UidDataKey = "uid"
-	Put(string) error
+	// ProviderDataKey is the key used in config maps to store the Provider
-	Delete() error
+	// UID which we use to ensure unique firewalls.
-}
+	ProviderDataKey = "providerUid"
-
+)
-// uidDataKey is the key used in config maps to store the UID.
-const uidDataKey = "uid"
 
 // ConfigMapVault stores cluster UIDs in config maps.
 // It's a layer on top of ConfigMapStore that just implements the utils.uidVault
 // interface.
 type ConfigMapVault struct {
+	storeLock      sync.Mutex
 	ConfigMapStore cache.Store
 	namespace      string
 	name           string
 }
 
-// Get retrieves the cluster UID from the cluster config map.
+// Get retrieves the value associated to the provided 'key' from the cluster config map.
 // If this method returns an error, it's guaranteed to be apiserver flake.
 // If the error is a not found error it sets the boolean to false and
 // returns and error of nil instead.
-func (c *ConfigMapVault) Get() (string, bool, error) {
+func (c *ConfigMapVault) Get(key string) (string, bool, error) {
-	key := fmt.Sprintf("%v/%v", c.namespace, c.name)
+	keyStore := fmt.Sprintf("%v/%v", c.namespace, c.name)
-	item, found, err := c.ConfigMapStore.GetByKey(key)
+	item, found, err := c.ConfigMapStore.GetByKey(keyStore)
 	if err != nil || !found {
 		return "", false, err
 	}
-	cfg := item.(*api.ConfigMap)
+	data := item.(*api.ConfigMap).Data
-	if k, ok := cfg.Data[uidDataKey]; ok {
+	c.storeLock.Lock()
+	defer c.storeLock.Unlock()
+	if k, ok := data[key]; ok {
 		return k, true, nil
 	}
-	return "", false, fmt.Errorf("Found config map %v but it doesn't contain uid key: %+v", key, cfg.Data)
+	glog.Infof("Found config map %v but it doesn't contain key %v: %+v", keyStore, key, data)
+	return "", false, nil
 }
 
-// Put stores the given UID in the cluster config map.
+// Put inserts a key/value pair in the cluster config map.
-func (c *ConfigMapVault) Put(uid string) error {
+// If the key already exists, the value provided is stored.
+func (c *ConfigMapVault) Put(key, val string) error {
+	c.storeLock.Lock()
+	defer c.storeLock.Unlock()
 	apiObj := &api.ConfigMap{
 		ObjectMeta: api.ObjectMeta{
 			Name:      c.name,
 			Namespace: c.namespace,
 		},
-		Data: map[string]string{uidDataKey: uid},
 	}
 	cfgMapKey := fmt.Sprintf("%v/%v", c.namespace, c.name)
 
 	item, exists, err := c.ConfigMapStore.GetByKey(cfgMapKey)
 	if err == nil && exists {
 		data := item.(*api.ConfigMap).Data
-		if k, ok := data[uidDataKey]; ok && k == uid {
+		existingVal, ok := data[key]
+		if ok && existingVal == val {
+			// duplicate, no need to update.
 			return nil
-		} else if ok {
-			glog.Infof("Configmap %v has key %v but wrong value %v, updating", cfgMapKey, k, uid)
 		}
-
+		data[key] = val
+		apiObj.Data = data
+		if existingVal != val {
+			glog.Infof("Configmap %v has key %v but wrong value %v, updating to %v", cfgMapKey, key, existingVal, val)
+		} else {
+			glog.Infof("Configmap %v will be updated with %v = %v", cfgMapKey, key, val)
+		}
 		if err := c.ConfigMapStore.Update(apiObj); err != nil {
 			return fmt.Errorf("Failed to update %v: %v", cfgMapKey, err)
 		}
-	} else if err := c.ConfigMapStore.Add(apiObj); err != nil {
+	} else {
+		apiObj.Data = map[string]string{key: val}
+		if err := c.ConfigMapStore.Add(apiObj); err != nil {
 			return fmt.Errorf("Failed to add %v: %v", cfgMapKey, err)
 		}
-	glog.Infof("Successfully stored uid %q in config map %v", uid, cfgMapKey)
+	}
+	glog.Infof("Successfully stored key %v = %v in config map %v", key, val, cfgMapKey)
 	return nil
 }
 
-// Delete deletes the cluster UID storing config map.
+// Delete deletes the ConfigMapStore.
 func (c *ConfigMapVault) Delete() error {
 	cfgMapKey := fmt.Sprintf("%v/%v", c.namespace, c.name)
 	item, _, err := c.ConfigMapStore.GetByKey(cfgMapKey)
@@ -108,13 +122,19 @@ func (c *ConfigMapVault) Delete() error {
 // This client is essentially meant to abstract out the details of
 // configmaps and the API, and just store/retrieve a single value, the cluster uid.
 func NewConfigMapVault(c client.Interface, uidNs, uidConfigMapName string) *ConfigMapVault {
-	return &ConfigMapVault{NewConfigMapStore(c), uidNs, uidConfigMapName}
+	return &ConfigMapVault{
+		ConfigMapStore: NewConfigMapStore(c),
+		namespace:      uidNs,
+		name:           uidConfigMapName}
 }
 
 // NewFakeConfigMapVault is an implementation of the ConfigMapStore that doesn't
 // persist configmaps. Only used in testing.
 func NewFakeConfigMapVault(ns, name string) *ConfigMapVault {
-	return &ConfigMapVault{cache.NewStore(cache.MetaNamespaceKeyFunc), ns, name}
+	return &ConfigMapVault{
+		ConfigMapStore: cache.NewStore(cache.MetaNamespaceKeyFunc),
+		namespace:      ns,
+		name:           name}
 }
 
 // ConfigMapStore wraps the store interface. Implementations usually persist

controllers/gce/storage/configmaps_test.go

@@ -24,31 +24,51 @@ import (
 
 func TestConfigMapUID(t *testing.T) {
 	vault := NewFakeConfigMapVault(api.NamespaceSystem, "ingress-uid")
-	uid := ""
+	// Get value from an empty vault.
-	k, exists, err := vault.Get()
+	val, exists, err := vault.Get(UidDataKey)
 	if exists {
-		t.Errorf("Got a key from an empyt vault")
+		t.Errorf("Got value from an empty vault")
 	}
-	vault.Put(uid)
+
-	k, exists, err = vault.Get()
+	// Store empty value for UidDataKey.
+	uid := ""
+	vault.Put(UidDataKey, uid)
+	val, exists, err = vault.Get(UidDataKey)
 	if !exists || err != nil {
-		t.Errorf("Failed to retrieve value from vault")
+		t.Errorf("Failed to retrieve value from vault: %v", err)
 	}
-	if k != "" {
+	if val != "" {
 		t.Errorf("Failed to store empty string as a key in the vault")
 	}
-	vault.Put("newuid")
+
-	k, exists, err = vault.Get()
+	// Store actual value in key.
+	storedVal := "newuid"
+	vault.Put(UidDataKey, storedVal)
+	val, exists, err = vault.Get(UidDataKey)
 	if !exists || err != nil {
 		t.Errorf("Failed to retrieve value from vault")
+	} else if val != storedVal {
+		t.Errorf("Failed to store empty string as a key in the vault")
 	}
-	if k != "newuid" {
+
-		t.Errorf("Failed to modify uid")
+	// Store second value which will have the affect of updating to Store
+	// rather than adding.
+	secondVal := "bar"
+	vault.Put("foo", secondVal)
+	val, exists, err = vault.Get("foo")
+	if !exists || err != nil || val != secondVal {
+		t.Errorf("Failed to retrieve second value from vault")
 	}
+	val, exists, err = vault.Get(UidDataKey)
+	if !exists || err != nil || val != storedVal {
+		t.Errorf("Failed to retrieve first value from vault")
+	}
+
+	// Delete value.
 	if err := vault.Delete(); err != nil {
 		t.Errorf("Failed to delete uid %v", err)
 	}
-	if uid, exists, _ := vault.Get(); exists {
+	if _, exists, _ := vault.Get(UidDataKey); exists {
-		t.Errorf("Found uid %v, expected none", uid)
+		t.Errorf("Found uid but expected none after deletion")
 	}
 }

controllers/gce/utils/utils.go

@@ -93,6 +93,7 @@ const (
 // Namer handles centralized naming for the cluster.
 type Namer struct {
 	clusterName  string
+	firewallName string
 	nameLock     sync.Mutex
 }
 
@@ -103,6 +104,14 @@ func NewNamer(clusterName string) *Namer {
 	return namer
 }
 
+// NewNamer creates a new namer with a Firewall Name
+func NewNamerWithFirewall(clusterName string, firewallName string) *Namer {
+	namer := &Namer{}
+	namer.SetClusterName(clusterName)
+	namer.SetFirewallName(firewallName)
+	return namer
+}
+
 // NameComponents is a struct representing the components of a a GCE resource
 // name constructed by the namer. The format of such a name is:
 // k8s-resource-<metadata, eg port>--uid
@@ -123,6 +132,16 @@ func (n *Namer) SetClusterName(name string) {
 	n.clusterName = name
 }
 
+// SetFirewallName sets the firewall name of this cluster.
+func (n *Namer) SetFirewallName(firewall_name string) {
+	n.nameLock.Lock()
+	defer n.nameLock.Unlock()
+	if n.firewallName != firewall_name {
+		glog.Infof("Changing firewall name from %v to %v", n.firewallName, firewall_name)
+		n.firewallName = firewall_name
+	}
+}
+
 // GetClusterName returns the UID/name of this cluster.
 func (n *Namer) GetClusterName() string {
 	n.nameLock.Lock()
@@ -130,6 +149,18 @@ func (n *Namer) GetClusterName() string {
 	return n.clusterName
 }
 
+// GetFirewallName returns the firewall name of this cluster.
+func (n *Namer) GetFirewallName() string {
+	n.nameLock.Lock()
+	defer n.nameLock.Unlock()
+	// Retain backwards compatible behavior where firewallName == clusterName.
+	if n.firewallName == "" {
+		return n.clusterName
+	} else {
+		return n.firewallName
+	}
+}
+
 // Truncate truncates the given key to a GCE length limit.
 func (n *Namer) Truncate(key string) string {
 	if len(key) > nameLenLimit {
@@ -216,12 +247,12 @@ func (n *Namer) IGName() string {
 
 // FrSuffix constructs the glbc specific suffix for the FirewallRule.
 func (n *Namer) FrSuffix() string {
-	clusterName := n.GetClusterName()
+	firewallName := n.GetFirewallName()
 	// The entire cluster only needs a single firewall rule.
-	if clusterName == "" {
+	if firewallName == "" {
 		return globalFirewallSuffix
 	}
-	return n.Truncate(fmt.Sprintf("%v%v%v", globalFirewallSuffix, clusterNameDelimiter, clusterName))
+	return n.Truncate(fmt.Sprintf("%v%v%v", globalFirewallSuffix, clusterNameDelimiter, firewallName))
 }
 
 // FrName constructs the full firewall rule name, this is the name assigned by