Merge remote-tracking branch 'upstream/master'
diff --git a/src/emuvim/api/sonata/dummygatekeeper.py b/src/emuvim/api/sonata/dummygatekeeper.py
index 939070c..2aa712e 100755
--- a/src/emuvim/api/sonata/dummygatekeeper.py
+++ b/src/emuvim/api/sonata/dummygatekeeper.py
@@ -157,7 +157,7 @@
                 vnfi = self._start_vnfd(vnfd)
             self.instances[instance_uuid]["vnf_instances"].append(vnfi)
 
-        # 3. Configure the chaining of the network functions (currently only E-Line links supported)
+        # 3. Configure the chaining of the network functions (currently only E-Line and E-LAN links supported)
         vnf_id2vnf_name = defaultdict(lambda: "NotExistingNode",
                                 reduce(lambda x, y: dict(x, **y),
                                        map(lambda d: {d["vnf_id"]: d["vnf_name"]},
diff --git a/src/emuvim/dcemulator/monitoring.py b/src/emuvim/dcemulator/monitoring.py
index ba04771..2e1e041 100755
--- a/src/emuvim/dcemulator/monitoring.py
+++ b/src/emuvim/dcemulator/monitoring.py
@@ -44,23 +44,15 @@
 class to read openflow stats from the Ryu controller of the DCNetwork

 """

 

+PUSHGATEWAY_PORT = 9091

+CADVISOR_PORT = 8080

+

 class DCNetworkMonitor():

     def __init__(self, net):

         self.net = net

 

-        # TODO: these global variables should be part of a config file?

-        '''

-        # prometheus is started outside of son-emu

-        prometheus_ip = '127.0.0.1'

-        prometheus_port = '9090'

-        self.prometheus_REST_api = 'http://{0}:{1}'.format(prometheus_ip, prometheus_port)

-        '''

-        # helper variables to calculate the metrics

-        # pushgateway is started outside of son-emu and son-emu is started with net=host

-        # so localhost:9091 works

-        self.pushgateway = 'localhost:9091'

-        # when sdk is started with docker-compose, we could use

-        # self.pushgateway = 'pushgateway:9091'

+        # pushgateway address

+        self.pushgateway = 'localhost:{0}'.format(PUSHGATEWAY_PORT)

 

         # supported Prometheus metrics

         self.registry = CollectorRegistry()

@@ -103,7 +95,9 @@
         self.monitor_flow_thread.start()

 

         # helper tools

-        # cAdvisor, Prometheus pushgateway and DB are started as external container, outside of son-emu

+        # cAdvisor, Prometheus pushgateway are started as external container, to gather monitoring metric in son-emu

+        self.start_PushGateway()

+        self.start_cAdvisor()

 

 

     # first set some parameters, before measurement can start

@@ -473,7 +467,7 @@
             logging.warning("Pushgateway not reachable: {0} {1}".format(Exception, e))

 

 

-    def start_Prometheus(self, port=9090):

+    def start_Prometheus(self, port=CADVISOR_PORT):

         # prometheus.yml configuration file is located in the same directory as this file

         cmd = ["docker",

                "run",

@@ -487,7 +481,7 @@
         logging.info('Start Prometheus container {0}'.format(cmd))

         return Popen(cmd)

 

-    def start_PushGateway(self, port=9091):

+    def start_PushGateway(self, port=PUSHGATEWAY_PORT):

         cmd = ["docker",

                "run",

                "-d",

@@ -499,7 +493,7 @@
         logging.info('Start Prometheus Push Gateway container {0}'.format(cmd))

         return Popen(cmd)

 

-    def start_cadvisor(self, port=8090):

+    def start_cAdvisor(self, port=8080):

         cmd = ["docker",

                "run",

                "--rm",