An error has occurred:......CantStartEngineError: No sql_connection parameter is

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An error has occurred:
Traceback (most recent call last):
7 z+ N* J7 Q  y' x  File "/usr/lib/python2.7/site-packages/nova/cmd/manage.py", line 2708, in main
    ret = fn(*fn_args, **fn_kwargs)
  File "/usr/lib/python2.7/site-packages/nova/cmd/manage.py", line 968, in sync
    return migration.db_sync(version, database='api')
1 N8 e) v! h0 _  File "/usr/lib/python2.7/site-packages/nova/db/migration.py", line 26, in db_sync
' H: o( @$ c& Z0 k9 M$ R    return IMPL.db_sync(version=version, database=database, context=context)
  File "/usr/lib/python2.7/site-packages/nova/db/sqlalchemy/migration.py", line 53, in db_sync
% ]9 Y, w2 U& r$ ]& o+ m9 a    current_version = db_version(database, context=context)
, O0 l; c$ A6 @7 {" C9 k  File "/usr/lib/python2.7/site-packages/nova/db/sqlalchemy/migration.py", line 66, in db_version
    return versioning_api.db_version(get_engine(database, context=context),
8 r/ M6 h0 U( E  h6 Z9 a0 P# t% p  File "/usr/lib/python2.7/site-packages/nova/db/sqlalchemy/migration.py", line 43, in get_engine
    return db_session.get_api_engine()
  File "/usr/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py", line 152, in get_api_engine
    return api_context_manager.writer.get_engine()
/ c0 v6 o6 ?4 D) R  K( m8 E  File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 833, in get_engine
+ G/ J5 p6 J, \4 i    return self._factory.get_writer_engine()
  File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 372, in get_writer_engine
    self._start()
- W5 U6 T- F/ Y+ X: ~  File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 510, in _start
    engine_args, maker_args)
  File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 532, in _setup_for_connection
    "No sql_connection parameter is established")
8 T% V( s; {/ h0 U9 s, NCantStartEngineError: No sql_connection parameter is established
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缺少parameter数据库
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首先检查配置文件。nova_api配置文件是否写好第二检查数据库是否创建nova_api数据库。
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