nova-manage db sync
2015-07-31 16:16:23 WARNING nova.utils [-] /usr/lib/python2.7/dist-packages/sqlalchemy/pool.py:639: SADeprecationWarning: The 'listeners' argument to Pool (and create_engine()) is deprecated. Use event.listen(). Pool.__init__(self, creator, **kw)
2015-07-31 16:16:23 WARNING nova.utils [-] /usr/lib/python2.7/dist-packages/sqlalchemy/pool.py:145: SADeprecationWarning: Pool.add_listener is deprecated. Use event.listen() self.add_listener(l)这是怎么回事呢?求大神给予解答!跪谢!