PyMongo AutoReconnect：超时

Question

我在Azure环境中工作。我有一个运行Django应用程序（Open edX）的VM和另一个VM实例（Ubuntu 16.04）上的Mongo服务器。每当我尝试在应用程序中加载任何东西（从Mongo服务器获取数据）时，我都会收到类似这样的错误：

Feb 23 12:49:43 xxxxx [service_variant=lms][mongodb_proxy][env:sandbox] ERROR [xxxxx  13875] [mongodb_proxy.py:55] - Attempt 0
Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/mongodb_proxy.py", line 53, in wrapper
    return func(*args, **kwargs)
  File "/edx/app/edxapp/edx-platform/common/lib/xmodule/xmodule/contentstore/mongo.py", line 135, in find
    with self.fs.get(content_id) as fp:
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/gridfs/__init__.py", line 159, in get
    return GridOut(self.__collection, file_id)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/gridfs/grid_file.py", line 406, in __init__
    self._ensure_file()
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/gridfs/grid_file.py", line 429, in _ensure_file
    self._file = self.__files.find_one({"_id": self.__file_id})
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/pymongo/collection.py", line 1084, in find_one
    for result in cursor.limit(-1):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/pymongo/cursor.py", line 1149, in next
    if len(self.__data) or self._refresh():
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/pymongo/cursor.py", line 1081, in _refresh
    self.__codec_options.uuid_representation))
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/pymongo/cursor.py", line 996, in __send_message
    res = client._send_message_with_response(message, **kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/pymongo/mongo_client.py", line 1366, in _send_message_with_response
    raise AutoReconnect(str(e))
AutoReconnect: timed out

首先我认为这是因为我的Mongo服务器存在于Django应用程序的虚拟网络之外的实例中。我在同一个虚拟网络中的实例上创建了一个新的Mongo服务器，但仍然会遇到这些问题。请注意，我最终会收到数据，但如果连接正常，我觉得我不会出现timed out错误。

如果有帮助，请使用我用于创建Mongo服务器的Ansible手册：https://github.com/edx/configuration/tree/master/playbooks/roles/mongo_3_2

此外，我已经将Mongo日志文件保留了尾标，这是我在应用服务器上出现timed out错误的同时出现的唯一一行：

2018-02-23T12:49:20.890+0000 [conn5]  authenticate db: edxapp { authenticate: 1, user: "user", nonce: "xxx", key: "xxx" }

mongostat和mongotop不会显示任何异常情况。此处还有htop输出：

我不知道还有什么要寻找或如何解决这个问题。

Answer 1

我忘了将Django应用程序设置中的Mongo服务器IP更改为指向虚拟网络内的新私有IP地址而不是公共IP。在我改变之后，它不再能够解决这个问题。

如果您正在阅读此内容，请确保在Azure中将私有IP更改为静态IP，如果您在Djagno应用程序设置中使用该IP地址。