src/emuvim/examples/monitoring_demo_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
  23 from emuvim.api.rest.rest_api_endpoint import RestApiEndpoint
  24
  25 from emuvim.api.zerorpc.compute import ZeroRpcApiEndpoint
  26 from emuvim.api.zerorpc.network import ZeroRpcApiEndpointDCNetwork
  27
  28
  29 logging.basicConfig(level=logging.INFO)
  30
  31
  32 def create_topology1():
  33     """
  34     1. Create a data center network object (DCNetwork) with monitoring enabled
  35     """
  36     net = DCNetwork(monitor=True, enable_learning=False)
  37
  38     """
  39     1b. Add endpoint APIs for the whole DCNetwork,
  40         to access and control the networking from outside.
  41         e.g., to setup forwarding paths between compute
  42         instances aka. VNFs (represented by Docker containers), passing through
  43         different switches and datacenters of the emulated topology
  44     """
  45     mon_api = ZeroRpcApiEndpointDCNetwork("0.0.0.0", 5151)
  46     mon_api.connectDCNetwork(net)
  47     mon_api.start()
  48
  49     """
  50     2. Add (logical) data centers to the topology
  51        (each data center is one "bigswitch" in our simplified
  52         first prototype)
  53     """
  54     dc1 = net.addDatacenter("datacenter1")
  55     dc2 = net.addDatacenter("datacenter2")
  56
  57     """
  58     3. You can add additional SDN switches for data center
  59        interconnections to the network.
  60     """
  61     s1 = net.addSwitch("s1")
  62
  63     """
  64     4. Add links between your data centers and additional switches
  65        to define you topology.
  66        These links can use Mininet's features to limit bw, add delay or jitter.
  67     """
  68
  69     net.addLink(dc1, s1)
  70     net.addLink(s1, dc2)
  71
  72
  73     """
  74     5. We want to access and control our data centers from the outside,
  75        e.g., we want to connect an orchestrator to start/stop compute
  76        resources aka. VNFs (represented by Docker containers in the emulated)
  77
  78        So we need to instantiate API endpoints (e.g. a zerorpc or REST
  79        interface). Depending on the endpoint implementations, we can connect
  80        one or more data centers to it, which can then be controlled through
  81        this API, e.g., start/stop/list compute instances.
  82     """
  83     # keep the old zeroRPC interface for the prometheus metric query test
  84     zapi1 = ZeroRpcApiEndpoint("0.0.0.0", 4242)
  85     # connect data centers to this endpoint
  86     zapi1.connectDatacenter(dc1)
  87     zapi1.connectDatacenter(dc2)
  88     # run API endpoint server (in another thread, don't block)
  89     zapi1.start()
  90
  91     # create a new instance of a endpoint implementation
  92     api1 = RestApiEndpoint("0.0.0.0", 5000)
  93     # connect data centers to this endpoint
  94     api1.connectDatacenter(dc1)
  95     api1.connectDatacenter(dc2)
  96     # connect total network also, needed to do the chaining and monitoring
  97     api1.connectDCNetwork(net)
  98     # run API endpoint server (in another thread, don't block)
  99     api1.start()
 100
 101     """
 102     5.1. For our example, we create a second endpoint to illustrate that
 103          this is supported by our design. This feature allows us to have
 104          one API endpoint for each data center. This makes the emulation
 105          environment more realistic because you can easily create one
 106          OpenStack-like REST API endpoint for *each* data center.
 107          This will look like a real-world multi PoP/data center deployment
 108          from the perspective of an orchestrator.
 109     """
 110     #zapi2 = ZeroRpcApiEndpoint("0.0.0.0", 4343)
 111     #zapi2.connectDatacenter(dc3)
 112     #zapi2.connectDatacenter(dc4)
 113     #zapi2.start()
 114
 115     """
 116     6. Finally we are done and can start our network (the emulator).
 117        We can also enter the Mininet CLI to interactively interact
 118        with our compute resources (just like in default Mininet).
 119        But we can also implement fully automated experiments that
 120        can be executed again and again.
 121     """
 122     net.start()
 123     net.CLI()
 124     # when the user types exit in the CLI, we stop the emulator
 125     net.stop()
 126
 127
 128 def main():
 129     setLogLevel('info')  # set Mininet loglevel
 130     create_topology1()
 131
 132
 133 if __name__ == '__main__':
 134     main()