在本地调试 docker-compose 调试 mysql+nginx+flask 程序，报错(2003, "Can't connect to MySQL server on '127.0.0.1' ([Errno 111] Connection refused)")。

线索如下：

Flask app 运行地址: 0.0.0.0:5000

已将 mysql.cnf 中的bind-address改为0.0.0.0，并在容器里面确认过更改成功

使用 MySQLWorkbench 可以成功连接到 localhost 数据库

SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:[email protected]:3306/my_database?charset=utf8'

期待回复，非常感谢！

完整的错误日志：

webapp_1 | The above exception was the direct cause of the following exception:

webapp_1 |

webapp_1 | Traceback (most recent call last):

webapp_1 | File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/sync.py", line 135, in handle

webapp_1 | self.handle_request(listener, req, client, addr)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/sync.py", line 176, in handle_request

webapp_1 | respiter = self.wsgi(environ, resp.start_response)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1997, in __call__

webapp_1 | return self.wsgi_app(environ, start_response)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1985, in wsgi_app

webapp_1 | response = self.handle_exception(e)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1540, in handle_exception

webapp_1 | reraise(exc_type, exc_value, tb)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise

webapp_1 | raise value

webapp_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app

webapp_1 | response = self.full_dispatch_request()

webapp_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request

webapp_1 | rv = self.handle_user_exception(e)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception

webapp_1 | reraise(exc_type, exc_value, tb)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise

webapp_1 | raise value

webapp_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request

webapp_1 | rv = self.dispatch_request()

webapp_1 | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request

webapp_1 | return self.view_functions[rule.endpoint](**req.view_args)

webapp_1 | File "/iodock/app/auth/views.py", line 58, in register

webapp_1 | if form.validate_on_submit():

webapp_1 | File "/usr/local/lib/python3.6/site-packages/flask_wtf/form.py", line 101, in validate_on_submit

webapp_1 | return self.is_submitted() and self.validate()

webapp_1 | File "/usr/local/lib/python3.6/site-packages/wtforms/form.py", line 310, in validate

webapp_1 | return super(Form, self).validate(extra)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/wtforms/form.py", line 152, in validate

webapp_1 | if not field.validate(self, extra):

webapp_1 | File "/usr/local/lib/python3.6/site-packages/wtforms/fields/core.py", line 204, in validate

webapp_1 | stop_validation = self._run_validation_chain(form, chain)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/wtforms/fields/core.py", line 224, in _run_validation_chain

webapp_1 | validator(form, self)

webapp_1 | File "/iodock/app/auth/forms.py", line 31, in validate_email

webapp_1 | if UserBaseInfo.query.filter_by(email=field.data).first():

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 2755, in first

webapp_1 | ret = list(self[0:1])

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 2547, in __getitem__

webapp_1 | return list(res)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 2855, in __iter__

webapp_1 | return self._execute_and_instances(context)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 2876, in _execute_and_instances

webapp_1 | close_with_result=True)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 2885, in _get_bind_args

webapp_1 | **kw

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 2867, in _connection_from_session

webapp_1 | conn = self.session.connection(**kw)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 998, in connection

webapp_1 | execution_options=execution_options)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 1003, in _connection_for_bind

webapp_1 | engine, execution_options)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 403, in _connection_for_bind

webapp_1 | conn = bind.contextual_connect()

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2112, in contextual_connect

webapp_1 | self._wrap_pool_connect(self.pool.connect, None),

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2151, in _wrap_pool_connect

webapp_1 | e, dialect, self)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1465, in _handle_dbapi_exception_noconnection

webapp_1 | exc_info

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause

webapp_1 | reraise(type(exception), exception, tb=exc_tb, cause=cause)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 186, in reraise

webapp_1 | raise value.with_traceback(tb)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2147, in _wrap_pool_connect

webapp_1 | return fn()

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 387, in connect

webapp_1 | return _ConnectionFairy._checkout(self)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 766, in _checkout

webapp_1 | fairy = _ConnectionRecord.checkout(pool)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 516, in checkout

webapp_1 | rec = pool._do_get()

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 1138, in _do_get

webapp_1 | self._dec_overflow()

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__

webapp_1 | compat.reraise(exc_type, exc_value, exc_tb)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 187, in reraise

webapp_1 | raise value

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 1135, in _do_get

webapp_1 | return self._create_connection()

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 333, in _create_connection

webapp_1 | return _ConnectionRecord(self)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 461, in __init__

webapp_1 | self.__connect(first_connect_check=True)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/pool.py", line 651, in __connect

webapp_1 | connection = pool._invoke_creator(self)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/strategies.py", line 105, in connect

webapp_1 | return dialect.connect(*cargs, **cparams)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 393, in connect

webapp_1 | return self.dbapi.connect(*cargs, **cparams)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/pymysql/__init__.py", line 94, in Connect

webapp_1 | return Connection(*args, **kwargs)

webapp_1 | File "/usr/local/lib/python3.6/site-packages/pymysql/connections.py", line 325, in __init__

webapp_1 | self.connect()

webapp_1 | File "/usr/local/lib/python3.6/site-packages/pymysql/connections.py", line 630, in connect

webapp_1 | raise exc

webapp_1 | sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2003, "Can't connect to MySQL server on '127.0.0.1' ([Errno 111] Connection refused)")