进行nova数据库同步时，出错。请达人帮助；谢谢！

1、进行nova数据库同步时，出错。
[root@bogon /]# /etc/init.d/nova-api start
Starting nova-api (via systemctl):                         [  确定  ]
[root@bogon /]# /etc/init.d/nova-network start
Starting nova-network (via systemctl):                     [  确定  ]
[root@bogon /]# /etc/init.d/nova-objectstore start
Starting nova-objectstore (via systemctl):                 [  确定  ]
[root@bogon /]# /etc/init.d/nova-scheduler start
Starting nova-scheduler (via systemctl):                   [  确定  ]
[root@bogon /]# /etc/init.d/nova-volume start
Starting nova-volume (via systemctl):                      [  确定  ]
[root@bogon /]#
[root@bogon /]#
[root@bogon /]# nova-manage db_sync
Traceback (most recent call last):
  File "/usr/bin/nova-manage", line 5, in <module>
    pkg_resources.run_script('nova==2012.1', 'nova-manage')
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 540, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 1455, in run_script
    execfile(script_filename, namespace, namespace)
  File "/usr/lib/python2.7/site-packages/nova-2012.1-py2.7.egg/EGG-INFO/scripts/nova-manage", line 80, in <module>
    from nova import context
  File "/usr/lib/python2.7/site-packages/nova-2012.1-py2.7.egg/nova/context.py", line 26, in <module>
    from nova import utils
  File "/usr/lib/python2.7/site-packages/nova-2012.1-py2.7.egg/nova/utils.py", line 52, in <module>
    import lockfile
ImportError: No module named lockfile

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