初始化db出现问题

Traceback (most recent call last):
File "manage.py", line 5, in
from app import app
File "/Users/raingolee/github/flask_pure/app/**init**.py", line 15, in
db = MongoEngine(app) #实例化数据库
File "/Users/raingolee/github/flask_pure/pure/lib/python3.5/site-packages/flask_mongoengine/**init**.py", line 33, in **init**
self.init_app(app)
File "/Users/raingolee/github/flask_pure/pure/lib/python3.5/site-packages/flask_mongoengine/**init**.py", line 66, in init_app
self.connection = mongoengine.connect(**conn_settings)
File "/Users/raingolee/github/flask_pure/pure/lib/python3.5/site-packages/mongoengine/connection.py", line 164, in connect
return get_connection(alias)
File "/Users/raingolee/github/flask_pure/pure/lib/python3.5/site-packages/mongoengine/connection.py", line 126, in get_connection
raise ConnectionError("Cannot connect to database %s :\n%s" % (alias, e))
mongoengine.connection.ConnectionError: Cannot connect to database default :
[Errno 61] Connection refused

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你好，是不是要启动Mongod 然后修改某个配置才能启动？