352 lines
11 KiB
Python
Executable File
352 lines
11 KiB
Python
Executable File
#!/usr/bin/env python
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2011 OpenStack, LLC.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Helper script for starting/stopping/reloading Glance server programs.
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Thanks for some of the code, Swifties ;)
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"""
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from __future__ import with_statement
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import errno
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import fcntl
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import gettext
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import os
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import resource
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import signal
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import subprocess
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import sys
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import time
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# If ../glance/__init__.py exists, add ../ to Python search path, so that
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# it will override what happens to be installed in /usr/(local/)lib/python...
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possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
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os.pardir,
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os.pardir))
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if os.path.exists(os.path.join(possible_topdir, 'glance', '__init__.py')):
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sys.path.insert(0, possible_topdir)
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gettext.install('glance', unicode=1)
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from glance.common import config
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from glance.openstack.common import cfg
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CONF = cfg.CONF
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ALL_COMMANDS = ['start', 'stop', 'shutdown', 'restart',
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'reload', 'force-reload']
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ALL_SERVERS = ['glance-api', 'glance-registry', 'glance-scrubber']
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GRACEFUL_SHUTDOWN_SERVERS = ['glance-api', 'glance-registry',
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'glance-scrubber']
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MAX_DESCRIPTORS = 32768
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MAX_MEMORY = (1024 * 1024 * 1024) * 2 # 2 GB
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USAGE = """%prog [options] <SERVER> <COMMAND> [CONFPATH]
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Where <SERVER> is one of:
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all, api, registry, scrubber
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And command is one of:
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start, stop, shutdown, restart, reload, force-reload
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And CONFPATH is the optional configuration file to use."""
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def gated_by(predicate):
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def wrap(f):
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def wrapped_f(*args):
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if predicate:
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return f(*args)
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else:
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return None
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return wrapped_f
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return wrap
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def pid_files(server, pid_file):
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pid_files = []
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if pid_file:
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if os.path.exists(os.path.abspath(pid_file)):
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pid_files = [os.path.abspath(pid_file)]
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else:
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if os.path.exists('/var/run/glance/%s.pid' % server):
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pid_files = ['/var/run/glance/%s.pid' % server]
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for pid_file in pid_files:
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pid = int(open(pid_file).read().strip())
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yield pid_file, pid
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def do_start(verb, server, args):
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if verb != 'Respawn':
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for pid_file, pid in pid_files(server, CONF.pid_file):
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if os.path.exists('/proc/%s' % pid):
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print ("%s appears to already be running: %s" %
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(server, pid_file))
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return
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else:
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print "Removing stale pid file %s" % pid_file
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os.unlink(pid_file)
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try:
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resource.setrlimit(resource.RLIMIT_NOFILE,
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(MAX_DESCRIPTORS, MAX_DESCRIPTORS))
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resource.setrlimit(resource.RLIMIT_DATA,
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(MAX_MEMORY, MAX_MEMORY))
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except ValueError:
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action = 'increase file descriptor limit'
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print 'Unable to %s. Running as non-root?' % action
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os.environ['PYTHON_EGG_CACHE'] = '/tmp'
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def write_pid_file(pid_file, pid):
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dir, file = os.path.split(pid_file)
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if not os.path.exists(dir):
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try:
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os.makedirs(dir)
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except OSError, err:
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if err.errno == errno.EACCES:
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sys.exit('Unable to create %s. Running as non-root?'
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% dir)
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fp = open(pid_file, 'w')
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fp.write('%d\n' % pid)
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fp.close()
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def redirect_to_null(fds):
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with open(os.devnull, 'r+b') as nullfile:
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for desc in fds: # close fds
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try:
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os.dup2(nullfile.fileno(), desc)
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except OSError:
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pass
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def redirect_to_syslog(fds, server):
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log_cmd = 'logger -t "%s[%d]"' % (server, os.getpid())
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process = subprocess.Popen(log_cmd,
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shell=True,
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stdin=subprocess.PIPE)
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for desc in fds: # pipe to logger command
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try:
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os.dup2(process.stdin.fileno(), desc)
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except OSError:
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pass
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def redirect_stdio(server, capture_output):
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input = [sys.stdin.fileno()]
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output = [sys.stdout.fileno(), sys.stderr.fileno()]
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redirect_to_null(input)
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if capture_output:
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redirect_to_syslog(output, server)
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else:
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redirect_to_null(output)
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@gated_by(CONF.capture_output)
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def close_stdio_on_exec():
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fds = [sys.stdin.fileno(), sys.stdout.fileno(), sys.stderr.fileno()]
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for desc in fds: # set close on exec flag
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fcntl.fcntl(desc, fcntl.F_SETFD, fcntl.FD_CLOEXEC)
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def launch(pid_file, conf_file=None, capture_output=False, await_time=0):
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args = [server]
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print '%sing %s' % (verb, server),
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if conf_file:
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args += ['--config-file', conf_file]
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print 'with %s' % conf_file,
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print
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close_stdio_on_exec()
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pid = os.fork()
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if pid == 0:
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os.setsid()
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redirect_stdio(server, capture_output)
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try:
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os.execlp('%s' % server, *args)
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except OSError, e:
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msg = 'unable to launch %s. Got error: %s' % (server, e)
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sys.exit(msg)
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sys.exit(0)
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else:
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write_pid_file(pid_file, pid)
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await_child(pid, await_time)
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return pid
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@gated_by(CONF.await_child)
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def await_child(pid, await_time):
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bail_time = time.time() + await_time
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while time.time() < bail_time:
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reported_pid, status = os.waitpid(pid, os.WNOHANG)
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if reported_pid == pid:
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global exitcode
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exitcode = os.WEXITSTATUS(status)
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break
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time.sleep(0.05)
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pid_file = get_pid_file(server, CONF.pid_file)
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conf_file = None
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if args and os.path.exists(args[0]):
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conf_file = os.path.abspath(os.path.expanduser(args[0]))
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return launch(pid_file, conf_file, CONF.capture_output, CONF.await_child)
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def get_pid_file(pid, pid_file):
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return (os.path.abspath(pid_file) if pid_file else
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'/var/run/glance/%s.pid' % server)
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def do_stop(server, args, graceful=False):
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if graceful and server in GRACEFUL_SHUTDOWN_SERVERS:
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sig = signal.SIGHUP
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else:
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sig = signal.SIGTERM
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did_anything = False
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pfiles = pid_files(server, CONF.pid_file)
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for pid_file, pid in pfiles:
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did_anything = True
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try:
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os.unlink(pid_file)
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except OSError:
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pass
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try:
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print 'Stopping %s pid: %s signal: %s' % (server, pid, sig)
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os.kill(pid, sig)
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except OSError:
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print "Process %d not running" % pid
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for pid_file, pid in pfiles:
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for _junk in xrange(150): # 15 seconds
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if not os.path.exists('/proc/%s' % pid):
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break
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time.sleep(0.1)
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else:
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print ('Waited 15 seconds for pid %s (%s) to die; giving up' %
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(pid, pid_file))
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if not did_anything:
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print 'No %s running' % server
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if __name__ == '__main__':
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exitcode = 0
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opts = [
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cfg.StrOpt('pid-file',
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metavar='PATH',
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help='File to use as pid file. Default: '
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'/var/run/glance/$server.pid'),
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cfg.IntOpt('await-child',
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metavar='DELAY',
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default=0,
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help='Period to wait for service death '
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'in order to report exit code '
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'(default is to not wait at all)'),
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cfg.BoolOpt('capture-output',
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default=False,
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help='Capture stdout/err in syslog '
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'instead of discarding'),
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cfg.BoolOpt('respawn',
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default=False,
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help='Restart service on unexpected death'),
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]
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CONF.register_cli_opts(opts)
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args = config.parse_args(usage=USAGE)
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@gated_by(CONF.await_child)
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@gated_by(CONF.respawn)
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def mutually_exclusive():
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sys.stderr.write('--await-child and --respawn are mutually exclusive')
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sys.exit(1)
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mutually_exclusive()
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if len(args) < 2:
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CONF.print_usage()
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sys.exit(1)
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server = args.pop(0).lower()
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if server == 'all':
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servers = ALL_SERVERS
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else:
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if not server.startswith('glance-'):
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server = 'glance-%s' % server
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if server not in ALL_SERVERS:
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server_list = ", ".join([s.replace('glance-', '')
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for s in ALL_SERVERS])
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msg = ("Unknown server '%(server)s' specified. Please specify "
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"all, or one of the servers: %(server_list)s" % locals())
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sys.exit(msg)
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servers = [server]
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command = args.pop(0).lower()
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if command not in ALL_COMMANDS:
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command_list = ", ".join(ALL_COMMANDS)
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msg = ("Unknown command %(command)s specified. Please specify a "
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"command in this list: %(command_list)s" % locals())
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sys.exit(msg)
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@gated_by(CONF.respawn)
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def anticipate_respawn(children):
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while children:
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pid, status = os.wait()
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if pid in children:
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(server, args) = children.pop(pid)
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pid_file = get_pid_file(server, CONF.pid_file)
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running = os.path.exists(pid_file)
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one_second_ago = time.time() - 1
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bouncing = (running and
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os.path.getmtime(pid_file) >= one_second_ago)
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if running and not bouncing:
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args = (server, args)
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new_pid = do_start('Respawn', *args)
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children[new_pid] = args
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else:
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rsn = 'bouncing' if bouncing else 'deliberately stopped'
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print 'Supressed respawn as %s was %s.' % (server, rsn)
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if command == 'start':
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children = {}
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for server in servers:
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args = (server, args)
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pid = do_start('Start', *args)
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children[pid] = args
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anticipate_respawn(children)
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if command == 'stop':
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for server in servers:
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do_stop(server, args)
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if command == 'shutdown':
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for server in servers:
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do_stop(server, args, graceful=True)
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if command == 'restart':
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for server in servers:
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do_stop(server, args)
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for server in servers:
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do_start('Restart', server, args)
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if command == 'reload' or command == 'force-reload':
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for server in servers:
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do_stop(server, args, graceful=True)
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do_start(server, args)
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sys.exit(exitcode)
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