diff --git a/hooks/nova_cc_context.py b/hooks/nova_cc_context.py
index e2bb2e3..4be275b 100644
--- a/hooks/nova_cc_context.py
+++ b/hooks/nova_cc_context.py
@@ -149,6 +149,15 @@ class VolumeServiceContext(ch_context.OSContextGenerator):
 
 class HAProxyContext(ch_context.HAProxyContext):
     interfaces = ['ceph']
+    external_ports = []
+
+    def __init__(self, _external_ports_maybe_callable):
+        super(HAProxyContext, self).__init__()
+
+        if callable(_external_ports_maybe_callable):
+            self.external_ports = _external_ports_maybe_callable()
+        else:
+            self.external_ports = _external_ports_maybe_callable
 
     def __call__(self):
         '''
@@ -158,50 +167,28 @@ class HAProxyContext(ch_context.HAProxyContext):
         '''
         ctxt = super(HAProxyContext, self).__call__()
 
-        # determine which port api processes should bind to, depending
-        # on existence of haproxy + apache frontends
-        compute_api = ch_cluster.determine_api_port(
-            common.api_port('nova-api-os-compute'), singlenode_mode=True)
-        ec2_api = ch_cluster.determine_api_port(
-            common.api_port('nova-api-ec2'), singlenode_mode=True)
-        s3_api = ch_cluster.determine_api_port(
-            common.api_port('nova-objectstore'), singlenode_mode=True)
-        placement_api = ch_cluster.determine_api_port(
-            common.api_port('nova-placement-api'), singlenode_mode=True)
-        metadata_api = ch_cluster.determine_api_port(
-            common.api_port('nova-api-metadata'), singlenode_mode=True)
-        # Apache ports
-        a_compute_api = ch_cluster.determine_apache_port(
-            common.api_port('nova-api-os-compute'), singlenode_mode=True)
-        a_ec2_api = ch_cluster.determine_apache_port(
-            common.api_port('nova-api-ec2'), singlenode_mode=True)
-        a_s3_api = ch_cluster.determine_apache_port(
-            common.api_port('nova-objectstore'), singlenode_mode=True)
-        a_placement_api = ch_cluster.determine_apache_port(
-            common.api_port('nova-placement-api'), singlenode_mode=True)
-        a_metadata_api = ch_cluster.determine_apache_port(
-            common.api_port('nova-api-metadata'), singlenode_mode=True)
         # to be set in nova.conf accordingly.
-        listen_ports = {
-            'osapi_compute_listen_port': compute_api,
-            'ec2_listen_port': ec2_api,
-            's3_listen_port': s3_api,
-            'placement_listen_port': placement_api,
-            'metadata_listen_port': metadata_api,
+        listen_ports_map = {
+            'osapi_compute_listen_port': 'nova-api-os-compute',
+            'ec2_listen_port': 'nova-api-ec2',
+            's3_listen_port': 'nova-objectstore',
+            'placement_listen_port': 'nova-placement-api',
+            'metadata_listen_port': 'nova-api-metadata',
         }
 
-        port_mapping = {
-            'nova-api-os-compute': [
-                common.api_port('nova-api-os-compute'), a_compute_api],
-            'nova-api-ec2': [
-                common.api_port('nova-api-ec2'), a_ec2_api],
-            'nova-objectstore': [
-                common.api_port('nova-objectstore'), a_s3_api],
-            'nova-placement-api': [
-                common.api_port('nova-placement-api'), a_placement_api],
-            'nova-api-metadata': [
-                common.api_port('nova-api-metadata'), a_metadata_api],
-        }
+        listen_ports = {}
+        port_mapping = {}
+        for nova_name,common_name in listen_ports_map.items():
+            # determine which port api processes should bind to, depending
+            # on existence of haproxy + apache frontends
+            listen_ports[nova_name] = ch_cluster.determine_api_port(
+                common.api_port(common_name), singlenode_mode=True)
+            if common.api_port(common_name) in external_ports:
+                port_mapping[common_name] = [
+                    common.api_port(common_name),
+                    ch_cluster.determine_apache_port(
+                        common.api_port(common_name), singlenode_mode=True)
+                    ]
 
         # for haproxy.conf
         ctxt['service_ports'] = port_mapping
diff --git a/hooks/nova_cc_utils.py b/hooks/nova_cc_utils.py
index b285e6b..0b61d4a 100644
--- a/hooks/nova_cc_utils.py
+++ b/hooks/nova_cc_utils.py
@@ -186,7 +186,7 @@ def get_base_resource_map():
             (HAPROXY_CONF, {
                 'contexts': [
                     ch_context.HAProxyContext(singlenode_mode=True),
-                    nova_cc_context.HAProxyContext()],
+                    nova_cc_context.HAProxyContext(determine_ports)],
                 'services': ['haproxy'],
             }),
             (APACHE_CONF, {