nova.conf

[api_database]
connection = postgresql+psycopg2://nova:6fe3e38dfd4af44786c7d317191e1e712c908794498e1ac1bfb308c5af5d@172.17.3.4/nova_api
.
.
[database]
connection = postgresql+psycopg2://nova:6fe3e38dfd4af44786c7d317191e1e712c908794498e1ac1bfb308c5af5d@172.17.3.4/nova
.
.
[placement_database]
connection = postgresql+psycopg2://placement:6fe3e38dfd4af44786c7d317191e1e712c908794498e1ac1bfb308c5af5d@172.17.3.4/placement



# su -s /bin/sh -c "nova-manage api_db sync" nova

An error has occurred:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/nova/cmd/manage.py", line 2303, in main
    ret = fn(*fn_args, **fn_kwargs)
  File "/usr/lib/python2.7/site-packages/nova/cmd/manage.py", line 858, in sync
    result = migration.db_sync(version2, database='placement')
  File "/usr/lib/python2.7/site-packages/nova/db/migration.py", line 26, in db_sync
    return IMPL.db_sync(version=version, database=database, context=context)
  File "/usr/lib/python2.7/site-packages/nova/db/sqlalchemy/migration.py", line 57, in db_sync
    current_version = db_version(database, context=context)
  File "/usr/lib/python2.7/site-packages/nova/db/sqlalchemy/migration.py", line 70, in db_version
    return versioning_api.db_version(get_engine(database, context=context),
  File "/usr/lib/python2.7/site-packages/nova/db/sqlalchemy/migration.py", line 47, in get_engine
    return placement_db.get_placement_engine()
  File "/usr/lib/python2.7/site-packages/nova/api/openstack/placement/db_api.py", line 39, in get_placement_engine
    return placement_context_manager.get_legacy_facade().get_engine()
  File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 803, in get_legacy_facade
    return self._factory.get_legacy_facade()
  File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 352, in get_legacy_facade
    self._start()
  File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 496, in _start
    engine_args, maker_args)
  File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 520, in _setup_for_connection
    sql_connection=sql_connection, **engine_kwargs)
  File "/usr/lib/python2.7/site-packages/debtcollector/renames.py", line 43, in decorator
    return wrapped(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/engines.py", line 202, in create_engine
    test_conn = _test_connection(engine, max_retries, retry_interval)
  File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/engines.py", line 380, in _test_connection
    return engine.connect()
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2102, in connect
    return self._connection_cls(self, **kwargs)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 90, in __init__
    if connection is not None else engine.raw_connection()
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2188, in raw_connection
    self.pool.unique_connection, _connection)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2162, in _wrap_pool_connect
    e, dialect, self)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 1472, in _handle_dbapi_exception_noconnection
    util.raise_from_cause(newraise, exc_info)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2158, in _wrap_pool_connect
    return fn()
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 345, in unique_connection
    return _ConnectionFairy._checkout(self)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 788, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 532, in checkout
    rec = pool._do_get()
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 1193, in _do_get
    self._dec_overflow()
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 1190, in _do_get
    return self._create_connection()
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 350, in _create_connection
    return _ConnectionRecord(self)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 477, in __init__
    self.__connect(first_connect_check=True)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 671, in __connect
    connection = pool._invoke_creator(self)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/strategies.py", line 106, in connect
    return dialect.connect(*cargs, **cparams)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/default.py", line 410, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "/usr/lib64/python2.7/site-packages/psycopg2/__init__.py", line 164, in connect
    conn = _connect(dsn, connection_factory=connection_factory, async=async)
  File "/usr/lib/python2.7/site-packages/eventlet/support/psycopg2_patcher.py", line 46, in eventlet_wait_callback
    state = conn.poll()
OperationalError: (psycopg2.OperationalError) asynchronous connection failed (Background on this error at: http://sqlalche.me/e/e3q8)