emuvim/dcemulator/node.py

   1 """
   2 Distributed Cloud Emulator (dcemulator)
   3 (c) 2015 by Manuel Peuster <manuel.peuster@upb.de>
   4 """
   5 import logging
   6
   7
   8 DCDPID_BASE = 1000  # start of switch dpid's used for data center switches
   9
  10
  11 class Datacenter(object):
  12     """
  13     Represents a logical data center to which compute resources
  14     (Docker containers) can be added at runtime.
  15
  16     Will also implement resource bookkeeping in later versions.
  17     """
  18
  19     def __init__(self, name):
  20         self.net = None  # DCNetwork to which we belong
  21         self.name = name
  22         self.switch = None  # first prototype assumes one "bigswitch" per DC
  23         self.containers = {}  # keep track of running containers
  24
  25     def _get_next_dc_dpid(self):
  26         global DCDPID_BASE
  27         DCDPID_BASE += 1
  28         return DCDPID_BASE
  29
  30     def create(self):
  31         """
  32         Each data center is represented by a single switch to which
  33         compute resources can be connected at run time.
  34
  35         TODO: This will be changed in the future to support multiple networks
  36         per data center
  37         """
  38         self.switch = self.net.mnet.addSwitch(
  39             "%s.s1" % self.name, dpid=hex(self._get_next_dc_dpid())[2:])
  40         logging.debug("created data center switch: %s" % str(self.switch))
  41
  42     def start(self):
  43         pass
  44
  45     def addCompute(self, name):
  46         """
  47         Create a new container as compute resource and connect it to this
  48         data center.
  49         """
  50         # TODO ip management
  51         d = self.net.addDocker("%s" % (name), dimage="ubuntu")
  52         self.net.addLink(d, self.switch) #params1={"ip": "10.0.0.254/8"}
  53         self.containers[name] = d
  54
  55     def removeCompute(self, name):
  56         """
  57         Stop and remove a container from this data center.
  58         """
  59         assert name in self.containers
  60         self.net.removeLink(
  61             link=None, node1=self.containers[name], node2=self.switch)
  62         self.net.removeDocker("%s" % (name))
  63         del self.containers[name]