(c) 2015 by Manuel Peuster <manuel.peuster@upb.de>
"""
from mininet.node import Docker
+from mininet.link import Link
import logging
+LOG = logging.getLogger("dcemulator")
+LOG.setLevel(logging.DEBUG)
+
DCDPID_BASE = 1000 # start of switch dpid's used for data center switches
def __init__(
self, name, dimage, **kwargs):
- logging.debug("Create EmulatorCompute instance: %s" % name)
- self.datacenter = None # pointer to current DC
-
+ self.datacenter = kwargs.get("datacenter") # pointer to current DC
+ self.flavor_name = kwargs.get("flavor_name")
+ LOG.debug("Starting compute instance %r in data center %r" % (name, str(self.datacenter)))
# call original Docker.__init__
Docker.__init__(self, name, dimage, **kwargs)
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
+ # first prototype assumes one "bigswitch" per DC
+ self.switch = None
+ # keep track of running containers
+ self.containers = {}
+ # pointer to assigned resource model
+ self._resource_model = None
+
+ def __repr__(self):
+ return self.label
def _get_next_dc_dpid(self):
global DCDPID_BASE
"""
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))
+ LOG.debug("created data center switch: %s" % str(self.switch))
def start(self):
pass
- def startCompute(self, name, image=None, command=None, network=None):
+ def startCompute(self, name, image=None, command=None, network=None, flavor_name="tiny"):
"""
Create a new container as compute resource and connect it to this
data center.
:param image: image name (string)
:param command: command (string)
:param network: networks list({"ip": "10.0.0.254/8"}, {"ip": "11.0.0.254/24"})
+ :param flavor_name: name of the flavor for this compute container
:return:
"""
assert name is not None
if len(network) < 1:
network.append({})
+ # allocate in resource resource model and compute resource limits for new container
+ cpu_limit = mem_limit = disk_limit = -1
+ cpu_period = cpu_quota = None
+ if self._resource_model is not None:
+ # call allocate in resource model to calculate resource limit for this container
+ (cpu_limit, mem_limit, disk_limit) = alloc = self._resource_model.allocate(name, flavor_name)
+ LOG.debug("Allocation result: %r" % str(alloc))
+ # check if we have a cpu_limit given by the used resource model
+ if cpu_limit > 0:
+ # calculate cpu period and quota for CFS
+ # (see: https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt)
+ # TODO consider multi core machines etc! non trivial!
+ # Attention minimum cpu_quota is 1ms (micro)
+ cpu_period = 100000 # lets consider a fixed period of 100000 microseconds for now
+ cpu_quota = cpu_period * cpu_limit # calculate the fraction of cpu time for this container
+ LOG.debug(
+ "CPU limit: cpu_quota = cpu_period * cpu_limit = %f * %f = %f" % (cpu_period, cpu_limit, cpu_quota))
+ # ATTENTION >= 1000 to avoid a invalid argument system error ... no idea why
+ if cpu_quota < 1000:
+ cpu_quota = 1000
+ LOG.warning("Increased CPU quota for %d to avoid system error." % name)
+ # TODO add memory and disc limitations
# create the container
- d = self.net.addDocker("%s" % (name), dimage=image, dcmd=command)
+ d = self.net.addDocker(
+ "%s" % (name),
+ dimage=image,
+ dcmd=command,
+ datacenter=self,
+ flavor_name=flavor_name,
+ cpu_period=int(cpu_period) if cpu_limit > 0 else None, # set cpu limits if needed
+ cpu_quota=int(cpu_quota) if cpu_limit > 0 else None,
+ )
# connect all given networks
for nw in network:
- self.net.addLink(d, self.switch, params1=nw)
+ # TODO we cannot use TCLink here (see: https://github.com/mpeuster/dockernet/issues/3)
+ self.net.addLink(d, self.switch, params1=nw, cls=Link)
# do bookkeeping
self.containers[name] = d
- d.datacenter = self
return d # we might use UUIDs for naming later on
def stopCompute(self, name):
link=None, node1=self.containers[name], node2=self.switch)
self.net.removeDocker("%s" % (name))
del self.containers[name]
+ # call resource model and free resources
+ if self._resource_model is not None:
+ self._resource_model.free(name)
return True
def listCompute(self):
"n_running_containers": len(self.containers),
"metadata": self.metadata
}
+
+ def assignResourceModel(self, rm):
+ """
+ Assign a resource model to this DC.
+ :param rm: a BaseResourceModel object
+ :return:
+ """
+ if self._resource_model is not None:
+ raise Exception("There is already an resource model assigned to this DC.")
+ self._resource_model = rm
+ self.net.rm_registrar.register(self, rm)
+ LOG.info("Assigned RM: %r to DC: %r" % (rm, self))
+