def __init__(self,hostname=get_hostname()):
'''
Constructor
'''
self.server=hostname
self.kernel=Essential()
self.db_name =self.kernel.get_db_name()
self.db_port = self.kernel.get_db_port()
self.connection = MongoClient(hostname, self.db_port)
self.db=self.connection[self.db_name]
def am_i_a_member_of_this(self,coordinator):
"""Checks if this node is member of the
'coordinator' storage domain. Port and
database name come from the main configuration
file (/etc/yanoama.conf).
Keyword arguments:
nodes -- coordinator hostname
Returns:
boolean -- member or not
"""
connection = MongoClient(coordinator, self.db_port)
db = connection[self.db_name]
recovered_peers = self.recover_dict_keys_from_colons_to_dots(db['peers'].find_one({}, {'_id': False}))
return get_hostname() in recovered_peers.keys()
def get_peers(self,hostname=get_hostname()):
"""Connects to a coordinator MongoBD database
and retrieves the list of member nodes of
this storage domain. It gets information from
db['nodes_latency_measurements'] entry. Port
number and database name come from the main
configuration file (yanoama.conf)
Keyword arguments:
coordinator -- coordinator to connect and
retrieve information (default localhost)
Returns:
dictionary -- members information where keys
are the hostnames
"""
if hostname == self.server:
return self.recover_dict_keys_from_colons_to_dots(self.db['nodes_latency_measurements'].find_one({}, {'_id': False}).copy())
else:
connection = MongoClient(hostname, self.db_port)
db=connection[self.db_name]
return self.recover_dict_keys_from_colons_to_dots(db['nodes_latency_measurements'].find_one({}, {'_id': False}).copy())
from yanoama.core.essential import Essential, \
get_hostname, log
from yanoama.backend.mongo import Mongo
except ImportError:
sys.path.append(get_install_path())
#import yanoama modules alternatively
from yanoama.core.essential import Essential, \
get_hostname, log
from yanoama.backend.mongo import Mongo
if __name__ == '__main__':
kernel=Essential()
db = Mongo()
local_peers=db.get_peers()
for coordinator in kernel.get_coordinators(get_hostname()):
peers=db.get_peers(coordinator)
to_be_removed=[]
for hostname in peers.keys():
if hostname in local_peers:
if local_peers[hostname]>peers[hostname]:
to_be_removed.append(hostname)
for hostname in to_be_removed:
del local_peers[hostname]
db.save_peers(local_peers)
#log/print out to the standard output
log('current number of members:'+str(len(local_peers.keys()))+', done.')
"""Deploy yanoama based on the node role,
either peer or coordinator.
"""
kernel=Essential()
#update services file with temp file,
#rest must be done by command line
temp_services_file='/tmp/services'
f = open(temp_services_file, 'w')
f.write('#local services'+'\n')
f.write('pilot\t\t'+str(kernel.get_pilot_port())+'/tcp\n')
f.write('mongo\t\t'+str(kernel.get_db_port())+'/tcp\n')
f.write('mongo_replication\t\t'+str(kernel.get_db_replication_port())+'/tcp\n')
f.close()
if get_hostname() in kernel.get_coordinators().keys():
"""this is a coordinator
#here the two-step installation procedure
#1) install cron jobs: get_rtt.py and
# peering.py
#2) install mongodb database as part of amen
# monitoring system.
"""
#
#
#(1)installing cron jobs
## get_rtt
kernel.install_runnable_script('/yanoama/monitoring/get_rtt.py')
#install as a cron job
install_cron_job("get_rtt.py > /tmp/get_rtt_output.log 2>&1")