from mininet.node import Docker
from mininet.link import Link
import logging
+import time
+import json
LOG = logging.getLogger("dcemulator")
LOG.setLevel(logging.DEBUG)
DC_COUNTER = 1
- def __init__(self, label, metadata={}):
+ def __init__(self, label, metadata={}, resource_log_path=None):
self.net = None # DCNetwork to which we belong
# each node (DC) has a short internal name used by Mininet
# this is caused by Mininets naming limitations for swtiches etc.
self.label = label
# dict to store arbitrary metadata (e.g. latitude and longitude)
self.metadata = metadata
+ # path to which resource information should be logged (e.g. for experiments). None = no logging
+ self.resource_log_path = resource_log_path
# first prototype assumes one "bigswitch" per DC
self.switch = None
# keep track of running containers
if len(network) < 1:
network.append({})
- # allocate in resource resource model and compute resource limits for new container
- if self._resource_model is not None:
- # TODO pass resource limits to new container (cf. Dockernet API) Issue #47
- (cpu_limit, mem_limit, disk_limit) = alloc = self._resource_model.allocate(name, flavor_name)
- LOG.debug("Allocation result: %r" % str(alloc))
# create the container
d = self.net.addDocker(
"%s" % (name),
dimage=image,
dcmd=command,
datacenter=self,
- flavor_name=flavor_name)
+ flavor_name=flavor_name
+ )
+
+ # apply resource limits to container if a resource model is defined
+ if self._resource_model is not None:
+ self._resource_model.allocate(d)
+
# connect all given networks
+ # if no --net option is given, network = [{}], so 1 empty dict in the list
+ # this results in 1 default interface with a default ip address
for nw in network:
# 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
+
+ # TODO re-enable logging
+ """
+ # write resource log if a path is given
+ if self.resource_log_path is not None:
+ l = dict()
+ l["t"] = time.time()
+ l["name"] = name
+ l["compute"] = d.getStatus()
+ l["flavor_name"] = flavor_name
+ l["action"] = "allocate"
+ l["cpu_limit"] = cpu_limit
+ l["mem_limit"] = mem_limit
+ l["disk_limit"] = disk_limit
+ l["rm_state"] = None if self._resource_model is None else self._resource_model.get_state_dict()
+ # append to logfile
+ with open(self.resource_log_path, "a") as f:
+ f.write("%s\n" % json.dumps(l))
+ """
return d # we might use UUIDs for naming later on
def stopCompute(self, name):
assert name is not None
if name not in self.containers:
raise Exception("Container with name %s not found." % name)
+ LOG.debug("Stopping compute instance %r in data center %r" % (name, str(self)))
+
+ # call resource model and free resources
+ if self._resource_model is not None:
+ self._resource_model.free(self.containers[name])
+
+ # remove links
self.net.removeLink(
link=None, node1=self.containers[name], node2=self.switch)
+
+ # remove container
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)
+
+ # TODO re-enable logging
+ """
+ # write resource log if a path is given
+ if self.resource_log_path is not None:
+ l = dict()
+ l["t"] = time.time()
+ l["name"] = name
+ l["flavor_name"] = None
+ l["action"] = "free"
+ l["cpu_limit"] = -1
+ l["mem_limit"] = -1
+ l["disk_limit"] = -1
+ l["rm_state"] = None if self._resource_model is None else self._resource_model.get_state_dict()
+ # append to logfile
+ with open(self.resource_log_path, "a") as f:
+ f.write("%s\n" % json.dumps(l))
+ """
return True
def listCompute(self):