def select(self, ctxt, host):
""" select a vm in specific host and a dest host """
nova = Nova()
mtc = Metric()
base_q = '''[{"field": "timestamp",
"op": "ge",
"value": "2016-01-20T04:30:00"},
{"field": "timestamp",
"op": "lt",
"value": "2016-01-20T05:00:00"},
{"field": "resource_id",
"op": "eq",
"value": "instance_id"}]'''
instances = nova.getInstancesOnHost(host)
cpu_avg = dict()
for itnce in instances:
query = base_q.replace('instance_id', itnce)
cpu_avg[itnce] = mtc.getMeterStatistics("cpu_util", query)['avg']
# NOTE change NOTE select most work heavy vm to migrate
if cpu_avg:
vm = max(cpu_avg, key=cpu_avg.get)
else:
vm = None
# NOTE change NOTE select a host randomly
hosts = nova.getComputeHosts()
hosts.remove(host)
dest = random.choice(hosts)
print "select {0} on host {1} to migrate to {2}".format(vm, host, dest)
return vm, dest
def monitor():
""" monitor host status to decide whether resource reallocation """
nova = Nova()
while 1:
hosts = nova.getComputeHosts()
for h in hosts:
sttcs = nova.hypervisorDetail(h)
if float(sttcs['mem_used']) / sttcs['mem_total'] > 0.3:
print "host busy", ",migrate vm from ", h
trigger_sche(h)
time.sleep(10)
