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#!@PYTHON@
# Memory Overcommitment Manager
# Copyright (C) 2010 Adam Litke, IBM Corporation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import sys
import signal
import os
import atexit
from optparse import OptionParser
from six.moves import configparser
import logging
import logging.handlers
import mom
mom_instance = None
def daemonize(pid_file):
try:
pid = os.fork()
if pid > 0:
sys.exit(0)
except OSError as e:
sys.stderr.write("momd: fork failed: %d (%s)\n" % (e.errno, e.strerror))
sys.exit(1)
os.chdir("/")
os.setsid()
try:
pid = os.fork()
if pid > 0:
sys.exit(0)
except OSError as e:
sys.stderr.write("momd: fork failed: %d (%s)\n" % (e.errno, e.strerror))
sys.exit(1)
pid = str(os.getpid())
try:
open(pid_file,'w+').write("%s\n" % pid)
except EnvironmentError as e:
sys.stderr.write("momd: failed to write pid file: %d (%s)\n" %
(e.errno, e.strerror))
sys.exit(1)
atexit.register(delpid, pid_file)
sys.stdout.flush()
sys.stderr.flush()
si = open('/dev/null', 'r')
so = open('/dev/null', 'a+')
se = open('/dev/null', 'a+')
os.dup2(si.fileno(), sys.stdin.fileno())
os.dup2(so.fileno(), sys.stdout.fileno())
os.dup2(se.fileno(), sys.stderr.fileno())
def delpid(pid_file):
try:
os.remove(pid_file)
except OSError as e:
logger = logging.getLogger('momd')
logger.error("Unable to remove pid file (%s): %s", pid_file, e.strerror)
def signal_quit(signum, frame):
global mom_instance
logger = logging.getLogger('momd')
logger.info("Caught signal -- shutting down")
mom_instance.shutdown()
def get_option_overrides(options):
config = configparser.ConfigParser()
config.add_section('main')
config.add_section('logging')
if options.plot_dir is not None:
config.set('main', 'plot-dir', options.plot_dir)
if options.log is not None:
config.set('logging', 'log', options.log)
if options.verbosity is not None:
config.set('logging', 'verbosity', options.verbosity)
if options.rules_file is not None:
config.set('main', 'policy', options.rules_file)
if options.policy_dir is not None:
config.set('main', 'policy-dir', options.policy_dir)
return config
def main():
global mom_instance
cmdline = OptionParser()
cmdline.add_option('-c', '--config-file', dest='config_file',
help='Load configuration from FILE', metavar='FILE',
default='/etc/mom.conf')
cmdline.add_option('-r', '--rules-file', dest='rules_file',
help='Load rules from FILE', metavar='FILE')
cmdline.add_option('-P', '--policy-dir', dest='policy_dir',
help='Load policies from DIR', metavar='DIR')
cmdline.add_option('-p', '--plot-dir', dest='plot_dir',
help='Save data plot files in DIR', metavar='DIR')
cmdline.add_option('-l', '--log', dest='log', metavar='TARGET',
help='Set the log to TARGET (stdout, or <file>')
cmdline.add_option('-v', '--verbose', dest='verbosity', metavar='LEVEL',
help='Set logging verbosity to LEVEL (0-4)')
cmdline.add_option('-d', '--daemon', action='store_true', dest='daemonize')
cmdline.add_option('', '--pid-file', dest='pid_file', metavar='FILE',
help='When running as a daemon, write pid to FILE',
default='/var/run/momd.pid')
(options, args) = cmdline.parse_args()
config_overrides = get_option_overrides(options)
if options.daemonize:
daemonize(options.pid_file)
signal.signal(signal.SIGINT, signal_quit)
signal.signal(signal.SIGTERM, signal_quit)
mom_instance = mom.MOM(options.config_file, config_overrides)
mom_instance.run()
sys.exit(0)
if __name__ == "__main__":
mom.enable_i8()
main()
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