afb8633d5f
This adds a wedge between nova-compute and the database implementation to specifically catch, log, and deny accesses. Theoretically, this should not be needed as a production environment would not even have the compute nodes configured to talk to the database. However, testing and upgraded environments may retain database access and thus avoid hitting real issues that can be fixed up prior to release. Putting this into the tree now will help ensure we have a consistent error scenario for test setups prior to release. Note that if nova is configured to use a local conductor, we do not insert the wedge, which provides an easy out for anyone needing to get a production system past a missed database access. Related to bp no-db-compute. Based on Russell's original tracer hack: I328fa92d5bfdadd5022f5c7efe981396d8ae7962 Change-Id: I478230220633e0d2ff94b6a4d756e07eab8517d7
85 lines
2.7 KiB
Python
Executable File
85 lines
2.7 KiB
Python
Executable File
#!/usr/bin/env python
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Starter script for Nova Compute."""
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import eventlet
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import os
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if os.name == 'nt':
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# eventlet monkey patching causes subprocess.Popen to fail on Windows
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# when using pipes due to missing non blocking I/O support
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eventlet.monkey_patch(os=False)
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else:
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eventlet.monkey_patch()
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import os
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import sys
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import traceback
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# If ../nova/__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, 'nova', '__init__.py')):
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sys.path.insert(0, POSSIBLE_TOPDIR)
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from nova import config
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import nova.db.api
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from nova import exception
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from nova.openstack.common import cfg
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from nova.openstack.common import log as logging
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from nova import service
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from nova import utils
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CONF = cfg.CONF
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CONF.import_opt('compute_topic', 'nova.compute.rpcapi')
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CONF.import_opt('use_local', 'nova.conductor.api', group='conductor')
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LOG = logging.getLogger('nova.compute')
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def block_db_access():
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class NoDB(object):
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def __getattr__(self, attr):
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return self
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def __call__(self, *args, **kwargs):
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stacktrace = "".join(traceback.format_stack())
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LOG.error('No db access allowed in nova-compute: %s' % stacktrace)
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raise exception.DBError('No db access allowed in nova-compute')
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nova.db.api.IMPL = NoDB()
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if __name__ == '__main__':
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config.parse_args(sys.argv)
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logging.setup('nova')
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utils.monkey_patch()
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if not CONF.conductor.use_local:
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block_db_access()
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server = service.Service.create(binary='nova-compute',
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topic=CONF.compute_topic,
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db_allowed=False)
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service.serve(server)
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service.wait()
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