def check_for_migration(manager,host,contexta):
#La migrazione deve essere eseguita solamente dai compute node
if host != FLAGS.cluster_name:
contexto = nova.context.get_admin_context()
results = db.service_get_all_compute_sorted_desc(contexto)
istanze_attive_nodo_locale = db.instance_get_all_by_host(contexto, host)
for result in results:
(service, instance_cores) = result
if service['host'] != host:
istanze_attive_nodo_remoto = db.instance_get_all_by_host(contexto, service['host'])
#condizione che abilita la migrazione
if len(istanze_attive_nodo_locale) <= len(istanze_attive_nodo_remoto):
for istanza in istanze_attive_nodo_locale:
repeat = True
while repeat:
manager.live_migration(contexto, istanza['id'], service['host'])
_instance_update(contexto, istanza['id'], vm_state=vm_states.MIGRATING)
old_instance = istanza
time.sleep(15)
new_instances = db.instance_get_all_by_host(contexto, service['host'])
for new_instance in new_instances:
if new_instance['uuid'] == old_instance['uuid']:
#Istanza migrata correttamente
_instance_update(contexto, istanza['id'], vm_state=vm_states.ACTIVE)
repeat = False
check_last_vm(host,contexto)
def _schedule_instance(self, context, instance_opts, *_args, **_kwargs):
"""Picks a host that is up and has the fewest running instances."""
elevated = context.elevated()
availability_zone = instance_opts.get('availability_zone')
zone, host = FLAGS.default_schedule_zone, None
if availability_zone:
zone, _x, host = availability_zone.partition(':')
if host and context.is_admin:
service = db.service_get_by_args(elevated, host, 'nova-compute')
if not utils.service_is_up(service):
raise exception.WillNotSchedule(host=host)
return host
#Metodo che restituisce tutti i compute node attivi
#TODO creare una lista dei compute node ad-hoc in stand-by da riattivare su necessita
#Get all compute services sorted by instance count.
#returns: a list of (Service, instance_count) tuples.
results = db.service_get_all_compute_sorted_desc(elevated)
out = open("/home/fabioferretti/scheduler_output","w")
out.write("Result 1)\n")
#i = 0
#while i < len(results):
out.write("\n%s" % len(results))
# i = i + 1
out.close()
in_isolation = instance_opts['image_ref'] in FLAGS.isolated_images
check_cores = not in_isolation or not FLAGS.skip_isolated_core_check
if zone:
results = [(service, cores) for (service, cores) in results
if service['availability_zone'] == zone]
out = open("/home/fabioferretti/scheduler_output","a")
out.write("Result 2)\n")
#i = 0
#while i < len(results):
#out.write("\n%s" % results[i])
out.write("\n%s" % len(results))
# i = i +1
out.close()
i = 0
ordered_results = []
for result in results:
(service, instance_cores) = result
if is_cluster_controller(service['host']):
ordered_results.append(results[i])
del results[i]
ordered_results = ordered_results + results
break
i = i + 1
#Ciclo su tutti i compute node trovati
for result in ordered_results:
(service, instance_cores) = result
if in_isolation and service['host'] not in FLAGS.isolated_hosts:
# isolated images run on isolated hosts
continue
if service['host'] in FLAGS.isolated_hosts and not in_isolation:
# images that aren't isolated only run on general hosts
continue
#Controllo se i core gia occupati piu quelli che verranno occupati con la VM
#supero la capacita massima del nodo
#TODO MODIFICARE LA CAPACITA MASSIMA al 70 per cento
if not (check_cores and instance_cores + instance_opts['vcpus'] > FLAGS.max_cores):
#controllo che il nodo non sia sospeso
if is_node_suspended(service['host']):
mac = get_macaddress_node_suspended(service['host'])
wake_on_lan(mac)
#TODO modificare con uno scambio di messaggi
time.sleep(10)
#se il nodo non e' attivo cambio il suo stato in active
if is_node_active(service['host']) == False:
change_node_state(service['host'], "active")
return service['host']
else:
if utils.service_is_up(service) and not service['disabled']:
#se il nodo nnon e' attivo cambio il suo stato in active
if is_node_active(service['host']) == False:
change_node_state(service['host'], "active")
return service['host']
msg = _("Is the appropriate service running?")
raise exception.NoValidHost(reason=msg)
