src/emuvim/dcemulator/node.py

   1 """
   2 Copyright (c) 2015 SONATA-NFV and Paderborn University
   3 ALL RIGHTS RESERVED.
   4
   5 Licensed under the Apache License, Version 2.0 (the "License");
   6 you may not use this file except in compliance with the License.
   7 You may obtain a copy of the License at
   8
   9     http://www.apache.org/licenses/LICENSE-2.0
  10
  11 Unless required by applicable law or agreed to in writing, software
  12 distributed under the License is distributed on an "AS IS" BASIS,
  13 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 See the License for the specific language governing permissions and
  15 limitations under the License.
  16
  17 Neither the name of the SONATA-NFV [, ANY ADDITIONAL AFFILIATION]
  18 nor the names of its contributors may be used to endorse or promote
  19 products derived from this software without specific prior written
  20 permission.
  21
  22 This work has been performed in the framework of the SONATA project,
  23 funded by the European Commission under Grant number 671517 through
  24 the Horizon 2020 and 5G-PPP programmes. The authors would like to
  25 acknowledge the contributions of their colleagues of the SONATA
  26 partner consortium (www.sonata-nfv.eu).
  27 """
  28 from mininet.node import Docker
  29 from mininet.link import Link
  30 from emuvim.dcemulator.resourcemodel import NotEnoughResourcesAvailable
  31 import logging
  32 import time
  33 import json
  34
  35 LOG = logging.getLogger("dcemulator.node")
  36 LOG.setLevel(logging.DEBUG)
  37
  38
  39 DCDPID_BASE = 1000  # start of switch dpid's used for data center switches
  40
  41
  42 class EmulatorCompute(Docker):
  43     """
  44     Emulator specific compute node class.
  45     Inherits from Containernet's Docker host class.
  46     Represents a single container connected to a (logical)
  47     data center.
  48     We can add emulator specific helper functions to it.
  49     """
  50
  51     def __init__(
  52             self, name, dimage, **kwargs):
  53         self.datacenter = kwargs.get("datacenter")  # pointer to current DC
  54         self.flavor_name = kwargs.get("flavor_name")
  55         LOG.debug("Starting compute instance %r in data center %r" % (name, str(self.datacenter)))
  56         # call original Docker.__init__
  57         Docker.__init__(self, name, dimage, **kwargs)
  58
  59     def getNetworkStatus(self):
  60         """
  61         Helper method to receive information about the virtual networks
  62         this compute instance is connected to.
  63         """
  64         # get all links and find dc switch interface
  65         networkStatusList = []
  66         for i in self.intfList():
  67             vnf_name = self.name
  68             vnf_interface = str(i)
  69             dc_port_name = self.datacenter.net.find_connected_dc_interface(vnf_name, vnf_interface)
  70             # format list of tuples (name, Ip, MAC, isUp, status, dc_portname)
  71             intf_dict = {'intf_name': str(i), 'ip': i.IP(), 'mac': i.MAC(), 'up': i.isUp(), 'status': i.status(), 'dc_portname': dc_port_name}
  72             networkStatusList.append(intf_dict)
  73
  74         return networkStatusList
  75
  76     def getStatus(self):
  77         """
  78         Helper method to receive information about this compute instance.
  79         """
  80         status = {}
  81         status["name"] = self.name
  82         status["network"] = self.getNetworkStatus()
  83         status["docker_network"] = self.dcinfo['NetworkSettings']['IPAddress']
  84         status["image"] = self.dimage
  85         status["flavor_name"] = self.flavor_name
  86         status["cpu_quota"] = self.cpu_quota
  87         status["cpu_period"] = self.cpu_period
  88         status["cpu_shares"] = self.cpu_shares
  89         status["cpuset"] = self.cpuset
  90         status["mem_limit"] = self.mem_limit
  91         status["memswap_limit"] = self.memswap_limit
  92         status["state"] = self.dcli.inspect_container(self.dc)["State"]
  93         status["id"] = self.dcli.inspect_container(self.dc)["Id"]
  94         status["datacenter"] = (None if self.datacenter is None
  95                                 else self.datacenter.label)
  96         return status
  97
  98
  99 class Datacenter(object):
 100     """
 101     Represents a logical data center to which compute resources
 102     (Docker containers) can be added at runtime.
 103
 104     Will also implement resource bookkeeping in later versions.
 105     """
 106
 107     DC_COUNTER = 1
 108
 109     def __init__(self, label, metadata={}, resource_log_path=None):
 110         self.net = None  # DCNetwork to which we belong
 111         # each node (DC) has a short internal name used by Mininet
 112         # this is caused by Mininets naming limitations for swtiches etc.
 113         self.name = "dc%d" % Datacenter.DC_COUNTER
 114         Datacenter.DC_COUNTER += 1
 115         # use this for user defined names that can be longer than self.name
 116         self.label = label
 117         # dict to store arbitrary metadata (e.g. latitude and longitude)
 118         self.metadata = metadata
 119         # path to which resource information should be logged (e.g. for experiments). None = no logging
 120         self.resource_log_path = resource_log_path
 121         # first prototype assumes one "bigswitch" per DC
 122         self.switch = None
 123         # keep track of running containers
 124         self.containers = {}
 125         # pointer to assigned resource model
 126         self._resource_model = None
 127
 128     def __repr__(self):
 129         return self.label
 130
 131     def _get_next_dc_dpid(self):
 132         global DCDPID_BASE
 133         DCDPID_BASE += 1
 134         return DCDPID_BASE
 135
 136     def create(self):
 137         """
 138         Each data center is represented by a single switch to which
 139         compute resources can be connected at run time.
 140
 141         TODO: This will be changed in the future to support multiple networks
 142         per data center
 143         """
 144         self.switch = self.net.addSwitch(
 145             "%s.s1" % self.name, dpid=hex(self._get_next_dc_dpid())[2:])
 146         LOG.debug("created data center switch: %s" % str(self.switch))
 147
 148     def start(self):
 149         pass
 150
 151     def startCompute(self, name, image=None, command=None, network=None, flavor_name="tiny"):
 152         """
 153         Create a new container as compute resource and connect it to this
 154         data center.
 155         :param name: name (string)
 156         :param image: image name (string)
 157         :param command: command (string)
 158         :param network: networks list({"ip": "10.0.0.254/8"}, {"ip": "11.0.0.254/24"})
 159         :param flavor_name: name of the flavor for this compute container
 160         :return:
 161         """
 162         assert name is not None
 163         # no duplications
 164         if name in [c.name for c in self.net.getAllContainers()]:
 165             raise Exception("Container with name %s already exists." % name)
 166         # set default parameter
 167         if image is None:
 168             image = "ubuntu:trusty"
 169         if network is None:
 170             network = {}  # {"ip": "10.0.0.254/8"}
 171         if isinstance(network, dict):
 172             network = [network]  # if we have only one network, put it in a list
 173         if isinstance(network, list):
 174             if len(network) < 1:
 175                 network.append({})
 176
 177         # create the container
 178         d = self.net.addDocker(
 179             "%s" % (name),
 180             dimage=image,
 181             dcmd=command,
 182             datacenter=self,
 183             flavor_name=flavor_name
 184         )
 185
 186         # apply resource limits to container if a resource model is defined
 187         if self._resource_model is not None:
 188             try:
 189                 self._resource_model.allocate(d)
 190                 self._resource_model.write_allocation_log(d, self.resource_log_path)
 191             except NotEnoughResourcesAvailable as ex:
 192                 LOG.warning("Allocation of container %r was blocked by resource model." % name)
 193                 LOG.info(ex.message)
 194                 # ensure that we remove the container
 195                 self.net.removeDocker(name)
 196                 return None
 197
 198         # connect all given networks
 199         # if no --net option is given, network = [{}], so 1 empty dict in the list
 200         # this results in 1 default interface with a default ip address
 201         for nw in network:
 202             # clean up network configuration (e.g. RTNETLINK does not allow ':' in intf names
 203             if nw.get("id") is not None:
 204                 nw["id"] = self._clean_ifname(nw["id"])
 205             # TODO we cannot use TCLink here (see: https://github.com/mpeuster/containernet/issues/3)
 206             self.net.addLink(d, self.switch, params1=nw, cls=Link, intfName1=nw.get('id'))
 207         # do bookkeeping
 208         self.containers[name] = d
 209         return d  # we might use UUIDs for naming later on
 210
 211     def stopCompute(self, name):
 212         """
 213         Stop and remove a container from this data center.
 214         """
 215         assert name is not None
 216         if name not in self.containers:
 217             raise Exception("Container with name %s not found." % name)
 218         LOG.debug("Stopping compute instance %r in data center %r" % (name, str(self)))
 219
 220         #  stop the monitored metrics
 221         if self.net.monitor_agent is not None:
 222             self.net.monitor_agent.stop_metric(name)
 223
 224         # call resource model and free resources
 225         if self._resource_model is not None:
 226             self._resource_model.free(self.containers[name])
 227             self._resource_model.write_free_log(self.containers[name], self.resource_log_path)
 228
 229         # remove links
 230         self.net.removeLink(
 231             link=None, node1=self.containers[name], node2=self.switch)
 232
 233         # remove container
 234         self.net.removeDocker("%s" % (name))
 235         del self.containers[name]
 236
 237         return True
 238
 239     def listCompute(self):
 240         """
 241         Return a list of all running containers assigned to this
 242         data center.
 243         """
 244         return list(self.containers.itervalues())
 245
 246     def getStatus(self):
 247         """
 248         Return a dict with status information about this DC.
 249         """
 250         return {
 251             "label": self.label,
 252             "internalname": self.name,
 253             "switch": self.switch.name,
 254             "n_running_containers": len(self.containers),
 255             "metadata": self.metadata
 256         }
 257
 258     def assignResourceModel(self, rm):
 259         """
 260         Assign a resource model to this DC.
 261         :param rm: a BaseResourceModel object
 262         :return:
 263         """
 264         if self._resource_model is not None:
 265             raise Exception("There is already an resource model assigned to this DC.")
 266         self._resource_model = rm
 267         self.net.rm_registrar.register(self, rm)
 268         LOG.info("Assigned RM: %r to DC: %r" % (rm, self))
 269
 270     @staticmethod
 271     def _clean_ifname(name):
 272         """
 273         Cleans up given string to be a
 274         RTNETLINK compatible interface name.
 275         :param name: string
 276         :return: string
 277         """
 278         if name is None:
 279             return "if0"
 280         name = name.replace(":", "-")
 281         name = name.replace(" ", "-")
 282         name = name.replace(".", "-")
 283         name = name.replace("_", "-")
 284         return name
 285