"""
import logging
+import site
+from subprocess import Popen
+import os
+
from mininet.net import Dockernet
-from mininet.node import Controller, OVSKernelSwitch, Switch, Docker, Host
+from mininet.node import Controller, OVSSwitch, OVSKernelSwitch, Switch, Docker, Host, RemoteController
from mininet.cli import CLI
-from mininet.log import setLogLevel, info
+from mininet.log import setLogLevel, info, debug
from mininet.link import TCLink, Link
+import networkx as nx
+from monitoring import DCNetworkMonitor
from node import Datacenter, EmulatorCompute
self.dcs = {}
# create a Mininet/Dockernet network
# call original Docker.__init__ and setup default controller
+ #Dockernet.__init__(
+ # self, controller=RemoteController, switch=OVSKernelSwitch, **kwargs)
Dockernet.__init__(
- self, controller=Controller, switch=OVSKernelSwitch, **kwargs)
- self.addController('c0')
+ self, controller=RemoteController, switch=OVSKernelSwitch, **kwargs)
+ self.addController('c0', controller=RemoteController)
+
+ # graph of the complete DC network
+ self.DCNetwork_graph=nx.DiGraph()
+
+ # monitoring agent
+ self.monitor_agent = DCNetworkMonitor(self)
+
+ # start Ryu controller
+ self.startRyu()
+
def addDatacenter(self, label, metadata={}):
"""
if not "ip" in params["params2"]:
params["params2"]["ip"] = self.getNextIp()
- return Dockernet.addLink(self, node1, node2, **params) # TODO we need TCLinks with user defined performance here
+ link = Dockernet.addLink(self, node1, node2, **params) # TODO we need TCLinks with user defined performance here
+
+ # add edge and assigned port number to graph in both directions between node1 and node2
+ self.DCNetwork_graph.add_edge(node1.name, node2.name, \
+ {'src_port': node1.ports[link.intf1], 'dst_port': node2.ports[link.intf2]})
+ self.DCNetwork_graph.add_edge(node2.name, node1.name, \
+ {'src_port': node2.ports[link.intf2], 'dst_port': node1.ports[link.intf1]})
+
+ return link
def addDocker( self, label, **params ):
"""
Wrapper for addDocker method to use custom container class.
"""
+ self.DCNetwork_graph.add_node(label)
return Dockernet.addDocker(self, label, cls=EmulatorCompute, **params)
+ def removeDocker( self, label, **params ):
+ """
+ Wrapper for removeDocker method to update graph.
+ """
+ self.DCNetwork_graph.remove_node(label)
+ return Dockernet.removeDocker(self, label, **params)
+
+ def addSwitch( self, name, add_to_graph=True, **params ):
+ """
+ Wrapper for addSwitch method to store switch also in graph.
+ """
+ if add_to_graph:
+ self.DCNetwork_graph.add_node(name)
+ return Dockernet.addSwitch(self, name, protocols='OpenFlow10,OpenFlow12,OpenFlow13', **params)
+
def getAllContainers(self):
"""
Returns a list with all containers within all data centers.
Dockernet.start(self)
def stop(self):
+ # stop Ryu controller
+ self.ryu_process.terminate()
+ #self.ryu_process.kill()
Dockernet.stop(self)
def CLI(self):
CLI(self)
+
+ # to remove chain do setChain( src, dst, cmd='del-flows')
+ def setChain(self, vnf_src_name, vnf_dst_name, cmd='add-flow'):
+ # get shortest path
+ path = nx.shortest_path(self.DCNetwork_graph, vnf_src_name, vnf_dst_name)
+ logging.info("Path between {0} and {1}: {2}".format(vnf_src_name, vnf_dst_name, path))
+
+ current_hop = vnf_src_name
+ for i in range(0,len(path)):
+ next_hop = path[path.index(current_hop)+1]
+ next_node = self.getNodeByName(next_hop)
+
+ if next_hop == vnf_dst_name:
+ return "path added between {0} and {1}".format(vnf_src_name, vnf_dst_name)
+ elif not isinstance( next_node, OVSSwitch ):
+ logging.info("Next node: {0} is not a switch".format(next_hop))
+ return "Next node: {0} is not a switch".format(next_hop)
+
+
+ switch_inport = self.DCNetwork_graph[current_hop][next_hop]['dst_port']
+ next2_hop = path[path.index(current_hop)+2]
+ switch_outport = self.DCNetwork_graph[next_hop][next2_hop]['src_port']
+
+ logging.info("add flow in switch: {0} in_port: {1} out_port: {2}".format(next_node.name, switch_inport, switch_outport))
+ # set of entry via ovs-ofctl
+ # TODO use rest API of ryu to set flow entries to correct witch dpid
+ if isinstance( next_node, OVSSwitch ):
+ match = 'in_port=%s' % switch_inport
+
+ if cmd=='add-flow':
+ action = 'action=%s' % switch_outport
+ s = ','
+ ofcmd = s.join([match,action])
+ elif cmd=='del-flows':
+ ofcmd = match
+ else:
+ ofcmd=''
+
+ next_node.dpctl(cmd, ofcmd)
+
+ current_hop = next_hop
+
+ return "destination node: {0} not reached".format(vnf_dst_name)
+
+ # start Ryu Openflow controller as Remote Controller for the DCNetwork
+ def startRyu(self):
+ # start Ryu controller with rest-API
+ python_install_path = site.getsitepackages()[0]
+ ryu_path = python_install_path + '/ryu/app/simple_switch_13.py'
+ ryu_path2 = python_install_path + '/ryu/app/ofctl_rest.py'
+ # change the default Openflow controller port to 6653 (official IANA-assigned port number), as used by Mininet
+ # Ryu still uses 6633 as default
+ ryu_option = '--ofp-tcp-listen-port'
+ ryu_of_port = '6653'
+ ryu_cmd = 'ryu-manager'
+ FNULL = open(os.devnull, 'w')
+ self.ryu_process = Popen([ryu_cmd, ryu_path, ryu_path2, ryu_option, ryu_of_port], stdout=FNULL, stderr=FNULL)
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