src/emuvim/examples/simple_topology_restapi.py

   1 """
   2 This is an example topology for the distributed cloud emulator (dcemulator).
   3 (c) 2015 by Manuel Peuster <manuel.peuster@upb.de>
   4
   5
   6 This is an example that shows how a user of the emulation tool can
   7 define network topologies with multiple emulated cloud data centers.
   8
   9 The definition is done with a Python API which looks very similar to the
  10 Mininet API (in fact it is a wrapper for it).
  11
  12 We only specify the topology *between* data centers not within a single
  13 data center (data center internal setups or placements are not of interest,
  14 we want to experiment with VNF chains deployed across multiple PoPs).
  15
  16 The original Mininet API has to be completely hidden and not be used by this
  17 script.
  18 """
  19 import logging
  20 from mininet.log import setLogLevel
  21 from emuvim.dcemulator.net import DCNetwork
  22 from emuvim.api.rest.compute import RestApiEndpoint
  23 #from emuvim.api.zerorpc.compute import ZeroRpcApiEndpoint
  24 from emuvim.api.zerorpc.network import ZeroRpcApiEndpointDCNetwork
  25
  26 logging.basicConfig(level=logging.INFO)
  27
  28
  29 def create_topology1():
  30     """
  31     1. Create a data center network object (DCNetwork)
  32     """
  33     net = DCNetwork()
  34
  35     """
  36     1b. add a monitoring agent to the DCNetwork
  37     """
  38     mon_api = ZeroRpcApiEndpointDCNetwork("0.0.0.0", 5151)
  39     mon_api.connectDCNetwork(net)
  40     mon_api.start()
  41     """
  42     2. Add (logical) data centers to the topology
  43        (each data center is one "bigswitch" in our simplified
  44         first prototype)
  45     """
  46     dc1 = net.addDatacenter("datacenter1")
  47     dc2 = net.addDatacenter("datacenter2")
  48     dc3 = net.addDatacenter("long_data_center_name3")
  49     dc4 = net.addDatacenter(
  50         "datacenter4",
  51         metadata={"mydata": "we can also add arbitrary metadata to each DC"})
  52
  53     """
  54     3. You can add additional SDN switches for data center
  55        interconnections to the network.
  56     """
  57     s1 = net.addSwitch("s1")
  58
  59     """
  60     4. Add links between your data centers and additional switches
  61        to define you topology.
  62        These links can use Mininet's features to limit bw, add delay or jitter.
  63     """
  64     net.addLink(dc1, dc2)
  65     net.addLink("datacenter1", s1)
  66     net.addLink(s1, dc3)
  67     net.addLink(s1, "datacenter4")
  68
  69     """
  70     5. We want to access and control our data centers from the outside,
  71        e.g., we want to connect an orchestrator to start/stop compute
  72        resources aka. VNFs (represented by Docker containers in the emulated)
  73
  74        So we need to instantiate API endpoints (e.g. a zerorpc or REST
  75        interface). Depending on the endpoint implementations, we can connect
  76        one or more data centers to it, which can then be controlled through
  77        this API, e.g., start/stop/list compute instances.
  78     """
  79     # create a new instance of a endpoint implementation
  80     api1 = RestApiEndpoint("127.0.0.1", 5000)
  81     # connect data centers to this endpoint
  82     api1.connectDatacenter(dc1)
  83     api1.connectDatacenter(dc2)
  84     api1.connectDatacenter(dc3)
  85     api1.connectDatacenter(dc4)
  86     # run API endpoint server (in another thread, don't block)
  87     api1.start()
  88
  89     """
  90     6. Finally we are done and can start our network (the emulator).
  91        We can also enter the Mininet CLI to interactively interact
  92        with our compute resources (just like in default Mininet).
  93        But we can also implement fully automated experiments that
  94        can be executed again and again.
  95     """
  96     net.start()
  97     net.CLI()
  98     # when the user types exit in the CLI, we stop the emulator
  99     net.stop()
 100
 101
 102 def main():
 103     setLogLevel('info')  # set Mininet loglevel
 104     create_topology1()
 105
 106
 107 if __name__ == '__main__':
 108     main()