diff --git a/chameleon/main.py b/chameleon/main.py
index fa63210..dbbca2f 100755
--- a/chameleon/main.py
+++ b/chameleon/main.py
@@ -33,14 +33,15 @@
 
 
 defs = dict(
-    #consul=os.environ.get('CONSUL', 'localhost:8500'),
-    instance_id=os.environ.get('INSTANCE_ID', os.environ.get('HOSTNAME', '1')),
     config=os.environ.get('CONFIG', './chameleon.yml'),
-    internal_host_address=os.environ.get('INTERNAL_HOST_ADDRESS',
-                                         get_my_primary_local_ipv4()),
+    consul=os.environ.get('CONSUL', 'localhost:8500'),
     external_host_address=os.environ.get('EXTERNAL_HOST_ADDRESS',
                                          get_my_primary_local_ipv4()),
+    grpc_endpoint=os.environ.get('GRPC_ENDPOINT', 'localhost:50055'),
     fluentd=os.environ.get('FLUENTD', None),
+    instance_id=os.environ.get('INSTANCE_ID', os.environ.get('HOSTNAME', '1')),
+    internal_host_address=os.environ.get('INTERNAL_HOST_ADDRESS',
+                                         get_my_primary_local_ipv4()),
     rest_port=os.environ.get('REST_PORT', 8881),
 )
 
@@ -58,13 +59,11 @@
                         default=defs['config'],
                         help=_help)
 
-    '''
     _help = '<hostname>:<port> to consul agent (default: %s)' % defs['consul']
     parser.add_argument(
         '-C', '--consul', dest='consul', action='store',
         default=defs['consul'],
         help=_help)
-    '''
 
     _help = ('<hostname> or <ip> at which Chameleon is reachable from outside '
              'the cluster (default: %s)' % defs['external_host_address'])
diff --git a/voltha/main.py b/voltha/main.py
index 5c87795..a3badea 100755
--- a/voltha/main.py
+++ b/voltha/main.py
@@ -36,15 +36,16 @@
 from voltha.structlog_setup import setup_logging
 
 defs = dict(
-    consul=os.environ.get('CONSUL', 'localhost:8500'),
-    instance_id=os.environ.get('INSTANCE_ID', os.environ.get('HOSTNAME', '1')),
     config=os.environ.get('CONFIG', './voltha.yml'),
-    interface=os.environ.get('INTERFACE', get_my_primary_interface()),
-    internal_host_address=os.environ.get('INTERNAL_HOST_ADDRESS',
-                                         get_my_primary_local_ipv4()),
+    consul=os.environ.get('CONSUL', 'localhost:8500'),
     external_host_address=os.environ.get('EXTERNAL_HOST_ADDRESS',
                                          get_my_primary_local_ipv4()),
     fluentd=os.environ.get('FLUENTD', None),
+    grpc_port=os.environ.get('GRPC_PORT', 50055),
+    instance_id=os.environ.get('INSTANCE_ID', os.environ.get('HOSTNAME', '1')),
+    internal_host_address=os.environ.get('INTERNAL_HOST_ADDRESS',
+                                         get_my_primary_local_ipv4()),
+    interface=os.environ.get('INTERFACE', get_my_primary_interface()),
     rest_port=os.environ.get('REST_PORT', 8880),
 )
 
@@ -76,6 +77,14 @@
                         default=defs['external_host_address'],
                         help=_help)
 
+    _help = ('port number of the GRPC service exposed by voltha (default: %s)'
+             % defs['grpc_port'])
+    parser.add_argument('-g', '--grpc-port',
+                        dest='grpc_port',
+                        action='store',
+                        default=defs['grpc_port'],
+                        help=_help)
+    
     _help = ('<hostname>:<port> to fluentd server (default: %s). (If not '
              'specified (None), the address from the config file is used'
              % defs['fluentd'])
@@ -220,7 +229,7 @@
             consul=self.args.consul)
         init_rest_service(self.args.rest_port)
 
-        self.grpc_server = VolthaGrpcServer().run()
+        self.grpc_server = VolthaGrpcServer(self.args.grpc_port).run()
 
         self.log.info('started-internal-services')