OpenStack Block Storage (Cinder)
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#!/usr/bin/env python
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Starter script for Cinder Volume."""
import logging as python_logging
import os
import re
import shlex
import sys
import eventlet
import eventlet.tpool
# Monkey patching must go before the oslo.log import, otherwise
# oslo.context will not use greenthread thread local and all greenthreads
# will share the same context.
if == 'nt':
# eventlet monkey patching the os module causes subprocess.Popen to fail
# on Windows when using pipes due to missing non-blocking IO support.
# Monkey patch the original current_thread to use the up-to-date _active
# global variable. See and
import __original_module_threading as orig_threading
import threading # noqa
orig_threading.current_thread.__globals__['_active'] = threading._active
from oslo_config import cfg
from oslo_log import log as logging
from oslo_privsep import priv_context
from oslo_reports import guru_meditation_report as gmr
from oslo_reports import opts as gmr_opts
# Need to register global_opts
from cinder.common import config # noqa
from cinder.common import constants
from cinder.db import api as session
from cinder import exception
from cinder import i18n
from cinder.i18n import _
from cinder import objects
from cinder import service
from cinder import utils
from cinder import version
host_opt = cfg.StrOpt('backend_host', help='Backend override of host value.')
backend_name_opt = cfg.StrOpt(
help='NOTE: For Windows internal use only. The name of the backend to be '
'managed by this process. It must be one of the backends defined '
'using the "enabled_backends" option. Note that normally, this '
'should not be used directly. Cinder uses it internally in order to '
'spawn subprocesses on Windows.')
cluster_opt = cfg.StrOpt('cluster',
help='Name of this cluster. Used to group volume '
'hosts that share the same backend '
'configurations to work in HA Active-Active '
LOG = None
service_started = False
def _launch_service(launcher, backend):
CONF.register_opt(host_opt, group=backend)
backend_host = getattr(CONF, backend).backend_host
host = "%s@%s" % (backend_host or, backend)
# We also want to set cluster to None on empty strings, and we
# ignore leading and trailing spaces.
cluster = CONF.cluster and CONF.cluster.strip()
cluster = (cluster or None) and '%s@%s' % (cluster, backend)
server = service.Service.create(host=host,
except Exception:
LOG.exception('Volume service %s failed to start.', host)
# Dispose of the whole DB connection pool here before
# starting another process. Otherwise we run into cases where
# child processes share DB connections which results in errors.
def _ensure_service_started():
if not service_started:
LOG.error('No volume service(s) started successfully, terminating.')
def _notify_service_started():
global service_started
service_started = True
def _launch_services_win32():
if CONF.backend_name and CONF.backend_name not in CONF.enabled_backends:
msg = _('The explicitly passed backend name "%(backend_name)s" is not '
'among the enabled backends: %(enabled_backends)s.')
raise exception.InvalidInput(
reason=msg % dict(backend_name=CONF.backend_name,
# We'll avoid spawning a subprocess if a single backend is requested.
single_backend_name = (CONF.enabled_backends[0]
if len(CONF.enabled_backends) == 1
else CONF.backend_name)
if single_backend_name:
launcher = service.get_launcher()
_launch_service(launcher, single_backend_name)
elif CONF.enabled_backends:
# We're using the 'backend_name' argument, requesting a certain backend
# and constructing the service object within the child process.
launcher = service.WindowsProcessLauncher()
py_script_re = re.compile(r'.*\.py\w?$')
for backend in filter(None, CONF.enabled_backends):
cmd = sys.argv + ['--backend_name=%s' % backend]
# Recent setuptools versions will trim '' and '.exe'
# extensions from sys.argv[0].
if py_script_re.match(sys.argv[0]):
cmd = [sys.executable] + cmd
def _launch_services_posix():
launcher = service.get_launcher()
for backend in filter(None, CONF.enabled_backends):
_launch_service(launcher, backend)
def main():
CONF(sys.argv[1:], project='cinder',
logging.setup(CONF, "cinder")
gmr.TextGuruMeditation.setup_autorun(version, conf=CONF)
global LOG
LOG = logging.getLogger(__name__)
if not CONF.enabled_backends:
LOG.error('Configuration for cinder-volume does not specify '
'"enabled_backends". Using DEFAULT section to configure '
'drivers is not supported since Ocata.')
if == 'nt':
# We cannot use oslo.service to spawn multiple services on Windows.
# It relies on forking, which is not available on Windows.
# Furthermore, service objects are unmarshallable objects that are
# passed to subprocesses.