docker-composed 用 mongoEngine 构建烧瓶，尝试连接但返回 pymongo 错误？

Question

pymongo.errors.ServerSelectionTimeoutError
pymongo.errors.ServerSelectionTimeoutError: localhost:27017: [Errno 111] Connection refused, Timeout: 30s, Topology Description: <TopologyDescription id: 6173037b75e69e32feeca143, topology_type: Single, servers: [<ServerDescription ('localhost', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('localhost:27017: [Errno 111] Connection refused')>]>
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2088, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2073, in wsgi_app
    response = self.handle_exception(e)
  File "/usr/local/lib/python3.7/site-packages/flask_cors/extension.py", line 165, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/usr/local/lib/python3.7/site-packages/flask_restx/api.py", line 671, in error_router
    return original_handler(f)
  File "/usr/local/lib/python3.7/site-packages/flask_restx/api.py", line 669, in error_router
    return self.handle_error(e)
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2070, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1515, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.7/site-packages/flask_cors/extension.py", line 165, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/usr/local/lib/python3.7/site-packages/flask_restx/api.py", line 671, in error_router
    return original_handler(f)
  File "/usr/local/lib/python3.7/site-packages/flask_restx/api.py", line 669, in error_router
    return self.handle_error(e)
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1513, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1499, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
  File "/usr/local/lib/python3.7/site-packages/flask_restx/api.py", line 403, in wrapper
    resp = resource(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/flask/views.py", line 83, in view
    return self.dispatch_request(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/flask_restx/resource.py", line 49, in dispatch_request
    resp = meth(*args, **kwargs)
  File "/app/auth/controller.py", line 35, in post
    return AuthService.login(login_data)
  File "/app/auth/service.py", line 16, in login
    user = User.objects(username='daas').first()
  File "/usr/local/lib/python3.7/site-packages/mongoengine/queryset/manager.py", line 38, in __get__
    queryset = queryset_class(owner, owner._get_collection())
  File "/usr/local/lib/python3.7/site-packages/mongoengine/document.py", line 215, in _get_collection
    db = cls._get_db()
  File "/usr/local/lib/python3.7/site-packages/mongoengine/document.py", line 193, in _get_db
    return get_db(cls._meta.get("db_alias", DEFAULT_CONNECTION_NAME))
  File "/usr/local/lib/python3.7/site-packages/mongoengine/connection.py", line 364, in get_db
    conn_settings["username"], conn_settings["password"], **auth_kwargs
  File "/usr/local/lib/python3.7/site-packages/pymongo/database.py", line 1581, in authenticate
    connect=True)
  File "/usr/local/lib/python3.7/site-packages/pymongo/mongo_client.py", line 810, in _cache_credentials
    writable_preferred_server_selector)
  File "/usr/local/lib/python3.7/site-packages/pymongo/topology.py", line 246, in select_server
    address))
  File "/usr/local/lib/python3.7/site-packages/pymongo/topology.py", line 203, in select_servers
    selector, server_timeout, address)
  File "/usr/local/lib/python3.7/site-packages/pymongo/topology.py", line 220, in _select_servers_loop
    (self._error_message(selector), timeout, self.description))
pymongo.errors.ServerSelectionTimeoutError: localhost:27017: [Errno 111] Connection refused, Timeout: 30s, Topology Description: <TopologyDescription id: 6173037b75e69e32feeca143, topology_type: Single, servers: [<ServerDescription ('localhost', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('localhost:27017: [Errno 111] Connection refused')>]>

码头工人撰写文件

   api:
    build: api
    image: azurecr.io/api
    ports:
      - "5000:5000"
    environment:
      - "ENV=prod"
      - "DB_USERNAME=name"
      - "DB_PASSWORD=password"
      - "DB_HOST=mongodb"
    depends_on:
      - "mongodb"
 mongodb:
    image: mongo
    container_name: mongodb
    command: mongod
    environment:
      - "MONGO_INITDB_ROOT_USERNAME=name"
      - "MONGO_INITDB_ROOT_PASSWORD=password"
    volumes:
      - dbdata:/data/db
volumes:
  dbdata:

Answer 1

您在代码中的某处设置了 MongoDB 连接字符串。它没有像您预期的那样接收DB_HOST（默认为localhost）。

如果您可以编辑您的问题，请在您建立 MongoDB 连接的行中添加，那么这将有所帮助。