我一直试图将aws RDS数据库实例连接到我下载的Flask应用程序。我一直在关注https://medium.com/@rodkey/deploying-a-flask-application-on-aws-a72daba6bb80，并使用此github上的flask应用程序连接到数据库https://github.com/inkjet/flask-aws-tutorial。我已经在RDS服务器上正确设置了权限，并且一直在使用以下代码连接到数据库。
# edit the URI below to add your RDS password and your AWS URL
# The other elements are the same as used in the tutorial
# format: (user):(password)@(db_identifier).amazonaws.com:3306/(db_name)
SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://{userName}:{password}@{endpoint}:3306/{dbName}'
# Uncomment the line below if you want to work with a local DB
#SQLALCHEMY_DATABASE_URI = 'sqlite:///test.db'
SQLALCHEMY_POOL_RECYCLE = 3600
WTF_CSRF_ENABLED = True
我仍然收到超时错误：
{path_to_virt_env}/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py:834: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future. Set it to True or False to suppress this warning.
'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
Traceback (most recent call last):
File "{path_to_virt_env}/lib/python3.7/site-packages/pymysql/connections.py", line 583, in connect
**kwargs)
File "/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/python3.7/socket.py", line 728, in create_connection
raise err
File "/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/python3.7/socket.py", line 716, in create_connection
sock.connect(sa)
socket.timeout: timed out
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 2345, in _wrap_pool_connect
return fn()
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 364, in connect
return _ConnectionFairy._checkout(self)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 778, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 495, in checkout
rec = pool._do_get()
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/impl.py", line 140, in _do_get
self._dec_overflow()
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/util/langhelpers.py", line 69, in __exit__
exc_value, with_traceback=exc_tb,
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 178, in raise_
raise exception
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/impl.py", line 137, in _do_get
return self._create_connection()
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 309, in _create_connection
return _ConnectionRecord(self)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 440, in __init__
self.__connect(first_connect_check=True)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 661, in __connect
pool.logger.debug("Error on connect(): %s", e)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/util/langhelpers.py", line 69, in __exit__
exc_value, with_traceback=exc_tb,
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 178, in raise_
raise exception
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 656, in __connect
connection = pool._invoke_creator(self)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/engine/strategies.py", line 114, in connect
return dialect.connect(*cargs, **cparams)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 490, in connect
return self.dbapi.connect(*cargs, **cparams)
File "{path_to_virt_env}/lib/python3.7/site-packages/pymysql/__init__.py", line 94, in Connect
return Connection(*args, **kwargs)
File "{path_to_virt_env}/lib/python3.7/site-packages/pymysql/connections.py", line 325, in __init__
self.connect()
File "{path_to_virt_env}/lib/python3.7/site-packages/pymysql/connections.py", line 630, in connect
raise exc
pymysql.err.OperationalError: (2003, "Can't connect to MySQL server on '{endpoint}' (timed out)")
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "db_create.py", line 4, in <module>
db.create_all()
File "{path_to_virt_env}/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 1039, in create_all
self._execute_for_all_tables(app, bind, 'create_all')
File "{path_to_virt_env}/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 1031, in _execute_for_all_tables
op(bind=self.get_engine(app, bind), **extra)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/sql/schema.py", line 4465, in create_all
ddl.SchemaGenerator, self, checkfirst=checkfirst, tables=tables
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 2103, in _run_visitor
with self._optional_conn_ctx_manager(connection) as conn:
File "/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/python3.7/contextlib.py", line 112, in __enter__
return next(self.gen)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 2095, in _optional_conn_ctx_manager
with self._contextual_connect() as conn:
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 2311, in _contextual_connect
self._wrap_pool_connect(self.pool.connect, None),
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 2349, in _wrap_pool_connect
e, dialect, self
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1591, in _handle_dbapi_exception_noconnection
sqlalchemy_exception, with_traceback=exc_info[2], from_=e
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 178, in raise_
raise exception
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 2345, in _wrap_pool_connect
return fn()
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 364, in connect
return _ConnectionFairy._checkout(self)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 778, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 495, in checkout
rec = pool._do_get()
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/impl.py", line 140, in _do_get
self._dec_overflow()
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/util/langhelpers.py", line 69, in __exit__
exc_value, with_traceback=exc_tb,
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 178, in raise_
raise exception
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/impl.py", line 137, in _do_get
return self._create_connection()
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 309, in _create_connection
return _ConnectionRecord(self)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 440, in __init__
self.__connect(first_connect_check=True)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 661, in __connect
pool.logger.debug("Error on connect(): %s", e)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/util/langhelpers.py", line 69, in __exit__
exc_value, with_traceback=exc_tb,
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 178, in raise_
raise exception
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 656, in __connect
connection = pool._invoke_creator(self)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/engine/strategies.py", line 114, in connect
return dialect.connect(*cargs, **cparams)
File "{path_to_virt_env}/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 490, in connect
return self.dbapi.connect(*cargs, **cparams)
File "{path_to_virt_env}/lib/python3.7/site-packages/pymysql/__init__.py", line 94, in Connect
return Connection(*args, **kwargs)
File "{path_to_virt_env}/lib/python3.7/site-packages/pymysql/connections.py", line 325, in __init__
self.connect()
File "{path_to_virt_env}/lib/python3.7/site-packages/pymysql/connections.py", line 630, in connect
raise exc
sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2003, "Can't connect to MySQL server on '{endpoint}' (timed out)")
(Background on this error at: http://sqlalche.me/e/e3q8
如果需要更多信息，请告诉我！
根据评论，问题是未启用RDS的公共可访问性设置。
解决方案是启用它。