def check_last_vm(host,context):
if host != FLAGS.cluster_name:
out = open("/home/fabioferretti/output","a")
out.write("\nhost --> %s" % host)
out.write("\nFLAGS.cluster_name --> %s" % FLAGS.cluster_name)
out.close()
result = db.instance_get_all_by_host(context, host)
if len(result) == 0:
#informo il cluster controller che non ho piu nessuna VM attiva
node_informations(host, context)
#se il nodo puo' essere svegliato tramite wake on lan viene sospeso
if FLAGS.wakeable == True:
sleep_on_lan(FLAGS.my_ip)
#ultima VM in esecuzione non necessaria la live migration
return True
#ci sono altre VM in esecuzione sul compute node
#devo controllare se gli altri nodi hanno capacita' sufficiente per eseguirle
return False
else:
result = db.instance_get_all_by_host(context, host)
if len(result) == 0:
change_node_state(host,"idle")
#sta eseguendo il cluster controller e le sue VM non migrano mai
return True
def node_informations(host, context):
try:
if FLAGS.my_ip == FLAGS.cluster_ip:
#Sta eseguendo il CLUSTER CONTROLLER
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind(('',5386))
buffersize = 256
fpid = os.fork()
if fpid!=0:
#inserisco i dati del cluster controller nel sistema
path_nodes = ''.join([FLAGS.list_nodes_path, "nodes"])
out_file = open(path_nodes,"w")
out_file.write("%s" % host)
out_file.write(" ")
out_file.write("cluster")
out_file.write(" ")
out_file.write("idle")
out_file.write(" ")
out_file.write("n")
out_file.write(" ")
out_file.write("%s" % get_mac_address(FLAGS.flat_interface))
out_file.write(" ")
out_file.write("%s" % FLAGS.my_ip)
out_file.write("\n")
out_file.close()
while 1:
#nome host
data_received1 = sock.recvfrom(buffersize)
nome_host = data_received1[0]
#tipo host
data_received2 = sock.recvfrom(buffersize)
tipo_host = data_received2[0]
#stato host
data_received3 = sock.recvfrom(buffersize)
stato_host = data_received3[0]
#host wakeable
data_received4 = sock.recvfrom(buffersize)
wakeable_host = data_received4[0]
#macaddress host
data_received5 = sock.recvfrom(buffersize)
macaddress_host = data_received5[0]
#ipaddress host
data_received6 = sock.recvfrom(buffersize)
ipaddress_host = data_received6[0]
if is_node_active(nome_host):
#se il nodo e' attivo nel sistema lo porto nello stato di sospensione
change_node_state(nome_host, stato_host)
else:
#se il nodo non e' mai stato attivato lo registro
path_nodes = ''.join([FLAGS.list_nodes_path, "nodes"])
out_file = open(path_nodes,"a")
out_file.write("%s" % nome_host)
out_file.write(" ")
out_file.write("%s" % tipo_host)
out_file.write(" ")
out_file.write("%s" % stato_host)
out_file.write(" ")
out_file.write("%s" % wakeable_host)
out_file.write(" ")
out_file.write("%s" % macaddress_host)
out_file.write(" ")
out_file.write("%s" % ipaddress_host)
out_file.write("\n")
out_file.close()
#se il nodo supporta il wake on lan invio il comando di spegnimento
if wakeable_host == 'y':
sleeponlan.sleep_on_lan(ipaddress_host)
else:
#Sta eseguendo un COMPUTE NODE
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
sock.sendto(host, (FLAGS.cluster_ip, 5386))
sock.sendto("compute", (FLAGS.cluster_ip, 5386))
if FLAGS.wakeable == True:
sock.sendto("suspended", (FLAGS.cluster_ip, 5386))
sock.sendto("y", (FLAGS.cluster_ip, 5386))
else:
sock.sendto("idle", (FLAGS.cluster_ip, 5386))
sock.sendto("n", (FLAGS.cluster_ip, 5386))
sock.sendto(get_mac_address(FLAGS.flat_interface), (FLAGS.cluster_ip, 5386))
sock.sendto(FLAGS.my_ip, (FLAGS.cluster_ip, 5386))
sock.close()
except:
pass
