vm: make VNC port range configurable from settings

closes #97

circle/circle/settings/base.py

@@ -528,6 +528,10 @@ except:
 LOCALE_PATHS = (join(SITE_ROOT, 'locale'), )
 COMPANY_NAME = get_env_variable("COMPANY_NAME", "BME IK 2015")
 
+first, last = get_env_variable(
+    'VNC_PORT_RANGE', '20000, 65536').replace(' ', '').split(',')
+VNC_PORT_RANGE = (int(first), int(last))  # inclusive start, exclusive end
+
 graphite_host = environ.get("GRAPHITE_HOST", None)
 graphite_port = environ.get("GRAPHITE_PORT", None)
 if graphite_host and graphite_port:

circle/vm/models/instance.py

@@ -62,7 +62,6 @@ scheduler = import_module(name=django.conf.settings.VM_SCHEDULER)
 ACCESS_PROTOCOLS = django.conf.settings.VM_ACCESS_PROTOCOLS
 ACCESS_METHODS = [(key, name) for key, (name, port, transport)
                   in ACCESS_PROTOCOLS.iteritems()]
-VNC_PORT_RANGE = (20000, 65536)  # inclusive start, exclusive end
 
 
 def find_unused_port(port_range, used_ports=[]):
@@ -81,7 +80,7 @@ def find_unused_port(port_range, used_ports=[]):
 
 def find_unused_vnc_port():
     port = find_unused_port(
-        port_range=VNC_PORT_RANGE,
+        port_range=django.conf.settings.VNC_PORT_RANGE,
         used_ports=Instance.objects.values_list('vnc_port', flat=True))
 
     if port is None: