Distributed Cloud Emulator (dcemulator)
(c) 2015 by Manuel Peuster <manuel.peuster@upb.de>
"""
+from mininet.node import Docker
import logging
DCDPID_BASE = 1000 # start of switch dpid's used for data center switches
+class EmulatorCompute(Docker):
+ """
+ Emulator specific compute node class.
+ Inherits from Dockernet's Docker host class.
+ Represents a single container connected to a (logical)
+ data center.
+ We can add emulator specific helper functions to it.
+ """
+
+ def __init__(
+ self, name, dimage, **kwargs):
+ logging.debug("Create EmulatorCompute instance: %s" % name)
+ self.datacenter = None # pointer to current DC
+
+ # call original Docker.__init__
+ Docker.__init__(self, name, dimage, **kwargs)
+
+ def getNetworkStatus(self):
+ """
+ Helper method to receive information about the virtual networks
+ this compute instance is connected to.
+ """
+ # format list of tuples (name, Ip, MAC, isUp, status)
+ return [(str(i), i.IP(), i.MAC(), i.isUp(), i.status())
+ for i in self.intfList()]
+
+ def getStatus(self):
+ """
+ Helper method to receive information about this compute instance.
+ """
+ status = {}
+ status["name"] = self.name
+ status["network"] = self.getNetworkStatus()
+ status["image"] = self.dimage
+ status["cpu_quota"] = self.cpu_quota
+ status["cpu_period"] = self.cpu_period
+ status["cpu_shares"] = self.cpu_shares
+ status["cpuset"] = self.cpuset
+ status["mem_limit"] = self.mem_limit
+ status["memswap_limit"] = self.memswap_limit
+ status["state"] = self.dcli.inspect_container(self.dc)["State"]
+ status["id"] = self.dcli.inspect_container(self.dc)["Id"]
+ status["datacenter"] = (None if self.datacenter is None
+ else self.datacenter.label)
+ return status
+
+
class Datacenter(object):
"""
Represents a logical data center to which compute resources
(Docker containers) can be added at runtime.
+
+ Will also implement resource bookkeeping in later versions.
"""
- def __init__(self, name):
+ DC_COUNTER = 1
+
+ def __init__(self, label, metadata={}):
self.net = None # DCNetwork to which we belong
- self.name = name
+ # each node (DC) has a short internal name used by Mininet
+ # this is caused by Mininets naming limitations for swtiches etc.
+ self.name = "dc%d" % Datacenter.DC_COUNTER
+ Datacenter.DC_COUNTER += 1
+ # use this for user defined names that can be longer than self.name
+ self.label = label
+ # dict to store arbitrary metadata (e.g. latitude and longitude)
+ self.metadata = metadata
self.switch = None # first prototype assumes one "bigswitch" per DC
+ self.containers = {} # keep track of running containers
def _get_next_dc_dpid(self):
global DCDPID_BASE
Each data center is represented by a single switch to which
compute resources can be connected at run time.
- TODO: This will be changes in the future to support multiple networks
+ TODO: This will be changed in the future to support multiple networks
per data center
"""
- self.switch = self.net.mnet.addSwitch(
+ self.switch = self.net.addSwitch(
"%s.s1" % self.name, dpid=hex(self._get_next_dc_dpid())[2:])
logging.debug("created data center switch: %s" % str(self.switch))
def start(self):
pass
- def addCompute(self):
- pass
+ def startCompute(self, name, image=None, network=None):
+ """
+ Create a new container as compute resource and connect it to this
+ data center.
- def removeCompute(self):
- pass
+ TODO: This interface will change to support multiple networks to which
+ a single container can be connected.
+ """
+ assert name is not None
+ # no duplications
+ if name in [c.name for c in self.net.getAllContainers()]:
+ raise Exception("Container with name %s already exists." % name)
+ # set default parameter
+ if image is None:
+ image = "ubuntu"
+ if network is None:
+ network = {} # {"ip": "10.0.0.254/8"}
+ # create the container and connect it to the given network
+ d = self.net.addDocker("%s" % (name), dimage=image)
+ self.net.addLink(d, self.switch, params1=network)
+ # do bookkeeping
+ self.containers[name] = d
+ d.datacenter = self
+ return d # we might use UUIDs for naming later on
+
+ def stopCompute(self, name):
+ """
+ Stop and remove a container from this data center.
+ """
+ assert name is not None
+ if name not in self.containers:
+ raise Exception("Container with name %s not found." % name)
+ self.net.removeLink(
+ link=None, node1=self.containers[name], node2=self.switch)
+ self.net.removeDocker("%s" % (name))
+ del self.containers[name]
+ return True
+
+ def listCompute(self):
+ """
+ Return a list of all running containers assigned to this
+ data center.
+ """
+ return list(self.containers.itervalues())
+
+ def getStatus(self):
+ """
+ Return a dict with status information about this DC.
+ """
+ return {
+ "label": self.label,
+ "internalname": self.name,
+ "switch": self.switch.name,
+ "n_running_containers": len(self.containers),
+ "metadata": self.metadata
+ }
projects / osm / vim-emu.git / blobdiff