pymongo.errors.ServerSelectionTimeoutError

Question

What could possibly be the reason of this error? I am using a ubuntu guest server in a windows 10 host system

The entire error is as follows:

` File "train_data.py", line 36, in <module>
    update_database.insert_features(features)
  File "/pupyl/preprocessing_data/update_database_with_features.py", line 59, in insert_features
    self.db_operation.insert_record(records, "train")
  File "/pupyl/database_client/database_operations.py", line 33, in insert_record
    self.db.train.insert(record)
  File "/usr/local/lib/python3.6/site-packages/pymongo/collection.py", line 3161, in insert
    check_keys, manipulate, write_concern)
  File "/usr/local/lib/python3.6/site-packages/pymongo/collection.py", line 607, in _insert
    bypass_doc_val, session)
  File "/usr/local/lib/python3.6/site-packages/pymongo/collection.py", line 595, in _insert_one
    acknowledged, _insert_command, session)
  File "/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1242, in _retryable_write
    with self._tmp_session(session) as s:
  File "/usr/local/lib/python3.6/contextlib.py", line 81, in __enter__
    return next(self.gen)
  File "/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1571, in _tmp_session
    s = self._ensure_session(session)
  File "/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1558, in _ensure_session
    return self.__start_session(True, causal_consistency=False)
  File "/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1511, in __start_session
    server_session = self._get_server_session()
  File "/usr/local/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1544, in _get_server_session
    return self._topology.get_server_session()
  File "/usr/local/lib/python3.6/site-packages/pymongo/topology.py", line 427, in get_server_session
    None)
  File "/usr/local/lib/python3.6/site-packages/pymongo/topology.py", line 199, in _select_servers_loop
    self._error_message(selector))
pymongo.errors.ServerSelectionTimeoutError: localhost:27017: [Errno 111] Connection refused
`

train_data.py is as follows, if that helps:

    features: Tuple[List[str], List[str], List[str], List[bool], List[str]] = \
        extract_features.separation_of_features(parsed_json)

    update_database.insert_features(features)

Answer 1

似乎您的应用程序无法连接到数据库，请验证数据库是否实际上在localhost：27017上运行并接受连接ps：尝试使用mongoshell连接