I got the following errors when I was deploying OpenStack with devstack.
2013-02-28 01:08:28 DEBUG nova.utils [-] backend <module 'nova.db.sqlalchemy.migration' from '/opt/stack
/nova/nova/db/sqlalchemy/migration.pyc'> from (pid=27011) __get_backend /opt/stack/nova/nova/utils.py:50
6
Command failed, please check log for more info
2013-02-28 01:09:15 CRITICAL nova [-] 'module' object has no attribute 'packs'
2013-02-28 01:09:15 TRACE nova Traceback (most recent call last):
2013-02-28 01:09:15 TRACE nova File "/opt/stack/nova/bin/nova-manage", line 1404, in <module>
2013-02-28 01:09:15 TRACE nova main()
2013-02-28 01:09:15 TRACE nova File "/opt/stack/nova/bin/nova-manage", line 1392, in main
2013-02-28 01:09:15 TRACE nova rpc.cleanup()
2013-02-28 01:09:15 TRACE nova File "/opt/stack/nova/nova/openstack/common/rpc/__init__.py", line 203,
in cleanup
2013-02-28 01:09:15 TRACE nova return _get_impl().cleanup()
2013-02-28 01:09:15 TRACE nova File "/opt/stack/nova/nova/openstack/common/rpc/__init__.py", line 264,
in _get_impl
2013-02-28 01:09:15 TRACE nova _RPCIMPL = importutils.import_module(cfg.CONF.rpc_backend)
2013-02-28 01:09:15 TRACE nova File "/opt/stack/nova/nova/openstack/common/importutils.py", line 58, i
n import_module
2013-02-28 01:09:15 TRACE nova __import__(import_str)
2013-02-28 01:09:15 TRACE nova File "/opt/stack/nova/nova/openstack/common/rpc/impl_kombu.py", line 30
, in <module>
2013-02-28 01:09:15 TRACE nova import kombu.messaging
2013-02-28 01:09:15 TRACE nova File "/usr/lib/python2.7/site-packages/kombu/messaging.py", line 15, in
<module>
2013-02-28 01:09:15 TRACE nova from kombu.serialization import encode
2013-02-28 01:09:15 TRACE nova File "/usr/lib/python2.7/site-packages/kombu/serialization.py", line 30
0, in <module>
2013-02-28 01:09:15 TRACE nova register_msgpack()
2013-02-28 01:09:15 TRACE nova File "/usr/lib/python2.7/site-packages/kombu/serialization.py", line 28
2, in register_msgpack
2013-02-28 01:09:15 TRACE nova registry.register('msgpack', msgpack.packs, msgpack.unpacks,
2013-02-28 01:09:15 TRACE nova AttributeError: 'module' object has no attribute 'packs'
2013-02-28 01:09:15 TRACE nova
++ failed
++ local r=1
+++ jobs -p
++ kill
++ set +o xtrace
解决办法：
1, yun -y install msgpack-python
2,modif vim /usr/lib/python2.6/site-packages/kombu-1.1.3-py2.6.egg/kombu/serialization.py
278 def register_msgpack():
279 """See http://msgpack.sourceforge.net/"""
280 try:
281 import msgpack
282 #registry.register('msgpack', msgpack.packs, msgpack.unpacks,#修改msgpack.pack
283 registry.register('msgpack', msgpack.pack, msgpack.unpack,
284 content_type='application/x-msgpack',
285 content_encoding='binary')
286 except ImportError:
287
288 def not_available(*args, **kwargs):
289 """In case a client receives a msgpack message, but yaml
290 isn't installed."""
291 raise SerializerNotInstalled(
292 "No decoder installed for msgpack. "
293 "Install the msgpack library")
294 registry.register('msgpack', None, not_available,
295 'application/x-msgpack')
