src/emuvim/dcemulator/node.py

   1 # Copyright (c) 2015 SONATA-NFV and Paderborn University
   2 # ALL RIGHTS RESERVED.
   3 #
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7 #
   8 #    http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15 #
  16 # Neither the name of the SONATA-NFV, Paderborn University
  17 # nor the names of its contributors may be used to endorse or promote
  18 # products derived from this software without specific prior written
  19 # permission.
  20 #
  21 # This work has been performed in the framework of the SONATA project,
  22 # funded by the European Commission under Grant number 671517 through
  23 # the Horizon 2020 and 5G-PPP programmes. The authors would like to
  24 # acknowledge the contributions of their colleagues of the SONATA
  25 # partner consortium (www.sonata-nfv.eu).
  26 from mininet.node import Docker
  27 from mininet.link import Link
  28 from emuvim.dcemulator.resourcemodel import NotEnoughResourcesAvailable
  29 import logging
  30
  31
  32 LOG = logging.getLogger("dcemulator.node")
  33 LOG.setLevel(logging.DEBUG)
  34
  35
  36 DCDPID_BASE = 1000  # start of switch dpid's used for data center switches
  37 EXTSAPDPID_BASE = 2000  # start of switch dpid's used for external SAP switches
  38
  39
  40 class EmulatorCompute(Docker):
  41     """
  42     Emulator specific compute node class.
  43     Inherits from Containernet's Docker host class.
  44     Represents a single container connected to a (logical)
  45     data center.
  46     We can add emulator specific helper functions to it.
  47     """
  48
  49     def __init__(
  50             self, name, dimage, **kwargs):
  51         self.datacenter = kwargs.get("datacenter")  # pointer to current DC
  52         self.flavor_name = kwargs.get("flavor_name")
  53         LOG.debug("Starting compute instance %r in data center %r" %
  54                   (name, str(self.datacenter)))
  55         # call original Docker.__init__
  56         Docker.__init__(self, name, dimage, **kwargs)
  57
  58     def getNetworkStatus(self):
  59         """
  60         Helper method to receive information about the virtual networks
  61         this compute instance is connected to.
  62         """
  63         # get all links and find dc switch interface
  64         networkStatusList = []
  65         for i in self.intfList():
  66             vnf_name = self.name
  67             vnf_interface = str(i)
  68             dc_port_name = self.datacenter.net.find_connected_dc_interface(
  69                 vnf_name, vnf_interface)
  70             # format list of tuples (name, Ip, MAC, isUp, status, dc_portname)
  71             intf_dict = {'intf_name': str(i), 'ip': "{0}/{1}".format(i.IP(), i.prefixLen), 'netmask': i.prefixLen,
  72                          'mac': i.MAC(), 'up': i.isUp(), 'status': i.status(), 'dc_portname': dc_port_name}
  73             networkStatusList.append(intf_dict)
  74
  75         return networkStatusList
  76
  77     def getStatus(self):
  78         """
  79         Helper method to receive information about this compute instance.
  80         """
  81         status = {}
  82         status["name"] = self.name
  83         status["network"] = self.getNetworkStatus()
  84         status["docker_network"] = self.dcinfo['NetworkSettings']['IPAddress']
  85         status["image"] = self.dimage
  86         status["flavor_name"] = self.flavor_name
  87         status["cpu_quota"] = self.resources.get('cpu_quota')
  88         status["cpu_period"] = self.resources.get('cpu_period')
  89         status["cpu_shares"] = self.resources.get('cpu_shares')
  90         status["cpuset"] = self.resources.get('cpuset_cpus')
  91         status["mem_limit"] = self.resources.get('mem_limit')
  92         status["memswap_limit"] = self.resources.get('memswap_limit')
  93         status["state"] = self.dcli.inspect_container(self.dc)["State"]
  94         status["id"] = self.dcli.inspect_container(self.dc)["Id"]
  95         status["short_id"] = self.dcli.inspect_container(self.dc)["Id"][:12]
  96         status["hostname"] = self.dcli.inspect_container(self.dc)[
  97             "Config"]['Hostname']
  98         status["datacenter"] = (None if self.datacenter is None
  99                                 else self.datacenter.label)
 100
 101         return status
 102
 103
 104 class EmulatorExtSAP(object):
 105     """
 106     Emulator specific class that defines an external service access point (SAP) for the service.
 107     Inherits from Containernet's OVSBridge class.
 108     Represents a single OVS switch connected to a (logical)
 109     data center.
 110     We can add emulator specific helper functions to it.
 111     """
 112
 113     def __init__(self, sap_name, sap_net, datacenter, **kwargs):
 114
 115         self.datacenter = datacenter  # pointer to current DC
 116         self.net = self.datacenter.net
 117         self.name = sap_name
 118
 119         LOG.debug("Starting ext SAP instance %r in data center %r" %
 120                   (sap_name, str(self.datacenter)))
 121
 122         # create SAP as separate OVS switch with an assigned ip address
 123         self.ip = str(sap_net[1]) + '/' + str(sap_net.prefixlen)
 124         self.subnet = sap_net
 125         # allow connection to the external internet through the host
 126         params = dict(NAT=True)
 127         self.switch = self.net.addExtSAP(sap_name, self.ip, dpid=hex(
 128             self._get_next_extSAP_dpid())[2:], **params)
 129         self.switch.start()
 130
 131     def _get_next_extSAP_dpid(self):
 132         global EXTSAPDPID_BASE
 133         EXTSAPDPID_BASE += 1
 134         return EXTSAPDPID_BASE
 135
 136     def getNetworkStatus(self):
 137         """
 138         Helper method to receive information about the virtual networks
 139         this compute instance is connected to.
 140         """
 141         # get all links and find dc switch interface
 142         networkStatusList = []
 143         for i in self.switch.intfList():
 144             vnf_name = self.name
 145             vnf_interface = str(i)
 146             if vnf_interface == 'lo':
 147                 continue
 148             dc_port_name = self.datacenter.net.find_connected_dc_interface(
 149                 vnf_name, vnf_interface)
 150             # format list of tuples (name, Ip, MAC, isUp, status, dc_portname)
 151             intf_dict = {'intf_name': str(i), 'ip': self.ip, 'netmask': i.prefixLen, 'mac': i.MAC(
 152             ), 'up': i.isUp(), 'status': i.status(), 'dc_portname': dc_port_name}
 153             networkStatusList.append(intf_dict)
 154
 155         return networkStatusList
 156
 157     def getStatus(self):
 158         return {
 159             "name": self.switch.name,
 160             "datacenter": self.datacenter.name,
 161             "network": self.getNetworkStatus()
 162         }
 163
 164
 165 class Datacenter(object):
 166     """
 167     Represents a logical data center to which compute resources
 168     (Docker containers) can be added at runtime.
 169
 170     Will also implement resource bookkeeping in later versions.
 171     """
 172
 173     DC_COUNTER = 1
 174
 175     def __init__(self, label, metadata={}, resource_log_path=None):
 176         self.net = None  # DCNetwork to which we belong
 177         # each node (DC) has a short internal name used by Mininet
 178         # this is caused by Mininets naming limitations for swtiches etc.
 179         self.name = "dc%d" % Datacenter.DC_COUNTER
 180         Datacenter.DC_COUNTER += 1
 181         # use this for user defined names that can be longer than self.name
 182         self.label = label
 183         # dict to store arbitrary metadata (e.g. latitude and longitude)
 184         self.metadata = metadata
 185         # path to which resource information should be logged (e.g. for
 186         # experiments). None = no logging
 187         self.resource_log_path = resource_log_path
 188         # first prototype assumes one "bigswitch" per DC
 189         self.switch = None
 190         # keep track of running containers
 191         self.containers = {}
 192         # keep track of attached external access points
 193         self.extSAPs = {}
 194         # pointer to assigned resource model
 195         self._resource_model = None
 196
 197     def __repr__(self):
 198         return self.label
 199
 200     def _get_next_dc_dpid(self):
 201         global DCDPID_BASE
 202         DCDPID_BASE += 1
 203         return DCDPID_BASE
 204
 205     def create(self):
 206         """
 207         Each data center is represented by a single switch to which
 208         compute resources can be connected at run time.
 209
 210         TODO: This will be changed in the future to support multiple networks
 211         per data center
 212         """
 213         self.switch = self.net.addSwitch(
 214             "%s.s1" % self.name, dpid=hex(self._get_next_dc_dpid())[2:])
 215         LOG.debug("created data center switch: %s" % str(self.switch))
 216
 217     def start(self):
 218         pass
 219
 220     def startCompute(self, name, image=None, command=None, network=None,
 221                      flavor_name="tiny", properties=dict(), **params):
 222         """
 223         Create a new container as compute resource and connect it to this
 224         data center.
 225         :param name: name (string)
 226         :param image: image name (string)
 227         :param command: command (string)
 228         :param network: networks list({"ip": "10.0.0.254/8"}, {"ip": "11.0.0.254/24"})
 229         :param flavor_name: name of the flavor for this compute container
 230         :param properties: dictionary of properties (key-value) that will be passed as environment variables
 231         :return:
 232         """
 233         assert name is not None
 234         # no duplications
 235         if name in [c.name for c in self.net.getAllContainers()]:
 236             raise Exception("Container with name %s already exists." % name)
 237         # set default parameter
 238         if image is None:
 239             image = "ubuntu:trusty"
 240         if network is None:
 241             network = {}  # {"ip": "10.0.0.254/8"}
 242         if isinstance(network, dict):
 243             # if we have only one network, put it in a list
 244             network = [network]
 245         if isinstance(network, list):
 246             if len(network) < 1:
 247                 network.append({})
 248
 249         # apply hard-set resource limits=0
 250         cpu_percentage = params.get('cpu_percent')
 251         if cpu_percentage:
 252             params['cpu_period'] = self.net.cpu_period
 253             params['cpu_quota'] = self.net.cpu_period * float(cpu_percentage)
 254
 255         env = properties
 256         properties['VNF_NAME'] = name
 257         # create the container
 258         d = self.net.addDocker(
 259             "%s" % (name),
 260             dimage=image,
 261             dcmd=command,
 262             datacenter=self,
 263             flavor_name=flavor_name,
 264             environment=env,
 265             **params
 266         )
 267
 268         # apply resource limits to container if a resource model is defined
 269         if self._resource_model is not None:
 270             try:
 271                 self._resource_model.allocate(d)
 272                 self._resource_model.write_allocation_log(
 273                     d, self.resource_log_path)
 274             except NotEnoughResourcesAvailable as ex:
 275                 LOG.warning(
 276                     "Allocation of container %r was blocked by resource model." % name)
 277                 LOG.info(ex.message)
 278                 # ensure that we remove the container
 279                 self.net.removeDocker(name)
 280                 return None
 281
 282         # connect all given networks
 283         # if no --net option is given, network = [{}], so 1 empty dict in the list
 284         # this results in 1 default interface with a default ip address
 285         for nw in network:
 286             # clean up network configuration (e.g. RTNETLINK does not allow ':'
 287             # in intf names
 288             if nw.get("id") is not None:
 289                 nw["id"] = self._clean_ifname(nw["id"])
 290             # TODO we cannot use TCLink here (see:
 291             # https://github.com/mpeuster/containernet/issues/3)
 292             self.net.addLink(d, self.switch, params1=nw,
 293                              cls=Link, intfName1=nw.get('id'))
 294         # do bookkeeping
 295         self.containers[name] = d
 296
 297         return d  # we might use UUIDs for naming later on
 298
 299     def stopCompute(self, name):
 300         """
 301         Stop and remove a container from this data center.
 302         """
 303         assert name is not None
 304         if name not in self.containers:
 305             raise Exception("Container with name %s not found." % name)
 306         LOG.debug("Stopping compute instance %r in data center %r" %
 307                   (name, str(self)))
 308
 309         #  stop the monitored metrics
 310         if self.net.monitor_agent is not None:
 311             self.net.monitor_agent.stop_metric(name)
 312
 313         # call resource model and free resources
 314         if self._resource_model is not None:
 315             self._resource_model.free(self.containers[name])
 316             self._resource_model.write_free_log(
 317                 self.containers[name], self.resource_log_path)
 318
 319         # remove links
 320         self.net.removeLink(
 321             link=None, node1=self.containers[name], node2=self.switch)
 322
 323         # remove container
 324         self.net.removeDocker("%s" % (name))
 325         del self.containers[name]
 326
 327         return True
 328
 329     def attachExternalSAP(self, sap_name, sap_net, **params):
 330         extSAP = EmulatorExtSAP(sap_name, sap_net, self, **params)
 331         # link SAP to the DC switch
 332         self.net.addLink(extSAP.switch, self.switch, cls=Link)
 333         self.extSAPs[sap_name] = extSAP
 334
 335     def removeExternalSAP(self, sap_name):
 336         sap_switch = self.extSAPs[sap_name].switch
 337         # sap_switch = self.net.getNodeByName(sap_name)
 338         # remove link of SAP to the DC switch
 339         self.net.removeLink(link=None, node1=sap_switch, node2=self.switch)
 340         self.net.removeExtSAP(sap_name)
 341         del self.extSAPs[sap_name]
 342
 343     def listCompute(self):
 344         """
 345         Return a list of all running containers assigned to this
 346         data center.
 347         """
 348         return list(self.containers.itervalues())
 349
 350     def listExtSAPs(self):
 351         """
 352         Return a list of all external SAPs assigned to this
 353         data center.
 354         """
 355         return list(self.extSAPs.itervalues())
 356
 357     def getStatus(self):
 358         """
 359         Return a dict with status information about this DC.
 360         """
 361         container_list = [name for name in self.containers]
 362         ext_saplist = [sap_name for sap_name in self.extSAPs]
 363         return {
 364             "label": self.label,
 365             "internalname": self.name,
 366             "switch": self.switch.name,
 367             "n_running_containers": len(self.containers),
 368             "metadata": self.metadata,
 369             "vnf_list": container_list,
 370             "ext SAP list": ext_saplist
 371         }
 372
 373     def assignResourceModel(self, rm):
 374         """
 375         Assign a resource model to this DC.
 376         :param rm: a BaseResourceModel object
 377         :return:
 378         """
 379         if self._resource_model is not None:
 380             raise Exception(
 381                 "There is already an resource model assigned to this DC.")
 382         self._resource_model = rm
 383         self.net.rm_registrar.register(self, rm)
 384         LOG.info("Assigned RM: %r to DC: %r" % (rm, self))
 385
 386     @staticmethod
 387     def _clean_ifname(name):
 388         """
 389         Cleans up given string to be a
 390         RTNETLINK compatible interface name.
 391         :param name: string
 392         :return: string
 393         """
 394         if name is None:
 395             return "if0"
 396         name = name.replace(":", "-")
 397         name = name.replace(" ", "-")
 398         name = name.replace(".", "-")
 399         name = name.replace("_", "-")
 400         return name