def get_instance():
if Script.instance is None:
from resource_management.libraries.functions.default import default
use_proxy = default("/agentConfigParams/agent/use_system_proxy_settings", True)
if not use_proxy:
reconfigure_urllib2_opener(ignore_system_proxy=True)
Script.instance = Script()
return Script.instance
def _job_context_injector(self, config):
"""
apscheduler hack to inject monkey-patching, context and configuration to all jobs inside scheduler in case if scheduler running
in embedded mode
Please note, this function called in job context thus all injects should be time-running optimized
:type config AmbariConfig.AmbariConfig
"""
if not config.use_system_proxy_setting():
from ambari_commons.network import reconfigure_urllib2_opener
reconfigure_urllib2_opener(ignore_system_proxy=True)
def main(heartbeat_stop_callback=None):
global config
global home_dir
parser = OptionParser()
parser.add_option("-v",
"--verbose",
dest="verbose",
action="store_true",
help="verbose log output",
default=False)
parser.add_option(
"-e",
"--expected-hostname",
dest="expected_hostname",
action="store",
help=
"expected hostname of current host. If hostname differs, agent will fail",
default=None)
parser.add_option("--home",
dest="home_dir",
action="store",
help="Home directory",
default="")
(options, args) = parser.parse_args()
expected_hostname = options.expected_hostname
home_dir = options.home_dir
logging_level = logging.DEBUG if options.verbose else logging.INFO
setup_logging(logger, AmbariConfig.AmbariConfig.getLogFile(),
logging_level)
global is_logger_setup
is_logger_setup = True
setup_logging(alerts_logger, AmbariConfig.AmbariConfig.getAlertsLogFile(),
logging_level)
Logger.initialize_logger('resource_management',
logging_level=logging_level)
if home_dir != "":
# When running multiple Ambari Agents on this host for simulation, each one will use a unique home directory.
Logger.info("Agent is using Home Dir: %s" % str(home_dir))
# use the host's locale for numeric formatting
try:
locale.setlocale(locale.LC_ALL, '')
except locale.Error as ex:
logger.warning(
"Cannot set locale for ambari-agent. Please check your systemwide locale settings. Failed due to: {0}."
.format(str(ex)))
default_cfg = {'agent': {'prefix': '/home/ambari'}}
config.load(default_cfg)
if (len(sys.argv) > 1) and sys.argv[1] == 'stop':
stop_agent()
if (len(sys.argv) > 2) and sys.argv[1] == 'reset':
reset_agent(sys.argv)
# Check for ambari configuration file.
resolve_ambari_config()
# Add syslog hanlder based on ambari config file
add_syslog_handler(logger)
# Starting data cleanup daemon
data_cleaner = None
if config.has_option('agent', 'data_cleanup_interval') and int(
config.get('agent', 'data_cleanup_interval')) > 0:
data_cleaner = DataCleaner(config)
data_cleaner.start()
perform_prestart_checks(expected_hostname)
# Starting ping port listener
try:
#This acts as a single process machine-wide lock (albeit incomplete, since
# we still need an extra file to track the Agent PID)
ping_port_listener = PingPortListener(config)
except Exception as ex:
err_message = "Failed to start ping port listener of: " + str(ex)
logger.error(err_message)
sys.stderr.write(err_message)
sys.exit(1)
ping_port_listener.start()
update_log_level(config)
update_open_files_ulimit(config)
if not config.use_system_proxy_setting():
logger.info('Agent is configured to ignore system proxy settings')
reconfigure_urllib2_opener(ignore_system_proxy=True)
if not OSCheck.get_os_family() == OSConst.WINSRV_FAMILY:
daemonize()
#
# Iterate through the list of server hostnames and connect to the first active server
#
active_server = None
server_hostnames = hostname.server_hostnames(config)
connected = False
stopped = False
# Keep trying to connect to a server or bail out if ambari-agent was stopped
while not connected and not stopped:
for server_hostname in server_hostnames:
server_url = config.get_api_url(server_hostname)
try:
server_ip = socket.gethostbyname(server_hostname)
logger.info('Connecting to Ambari server at %s (%s)',
server_url, server_ip)
except socket.error:
logger.warn(
"Unable to determine the IP address of the Ambari server '%s'",
server_hostname)
# Wait until MAX_RETRIES to see if server is reachable
netutil = NetUtil(config, heartbeat_stop_callback)
(retries, connected,
stopped) = netutil.try_to_connect(server_url, MAX_RETRIES, logger)
# if connected, launch controller
if connected:
logger.info('Connected to Ambari server %s', server_hostname)
# Set the active server
active_server = server_hostname
# Launch Controller communication
run_threads(server_hostname, heartbeat_stop_callback)
#
# If Ambari Agent connected to the server or
# Ambari Agent was stopped using stop event
# Clean up if not Windows OS
#
if connected or stopped:
ExitHelper().exit(0)
logger.info("finished")
break
pass # for server_hostname in server_hostnames
pass # while not (connected or stopped)
return active_server
