python - 连接到 MongoDB 副本集 - pymongo

Question

所以我有一个包含 3 个 mongo 副本集的集群。主要(主)在 rs1，而 rs2 和 rs3 是辅助。 但是，主服务器可能会更改，例如，由于某些配置问题，rs2 可能在任何给定时间都是主服务器。因此，我需要能够连接到适当的副本集。 假设它们位于 rs1=10.1.1.1、rs2=10.1.1.2 和 rs3=10.1.1.3。以下是我连接到 Mongo 的方式:

mongoserver_uri = "mongodb://{0}:{1}@{2}:{3}/admin".format(
                    username, password, host, port)
self.log.info("------- Mongo Server URI: %s --------" % mongoserver_uri)
self.client = pymongo.MongoClient(host=mongoserver_uri, ssl=True,
                                  ssl_cert_reqs=ssl.CERT_NONE)

但是，如果像解释的那样，副本集主要更改为 rs3，那么我将无法连接到 Mongo:

  File "/home/ubuntu/myproject/mongodb.py", line 165, in clear_collections
    collection.remove()
  File "/usr/local/lib/python2.7/site-packages/pymongo/collection.py", line 2258, in remove
    return self._delete(sock_info, spec_or_id, multi, write_concern)
  File "/usr/local/lib/python2.7/site-packages/pymongo/collection.py", line 916, in _delete
    codec_options=self.codec_options)
  File "/usr/local/lib/python2.7/site-packages/pymongo/pool.py", line 218, in command
    self._raise_connection_failure(error)
  File "/usr/local/lib/python2.7/site-packages/pymongo/pool.py", line 346, in _raise_connection_failure
    raise error
pymongo.errors.NotMasterError: not master

如何将其他副本集指定给 MongoClient？

Answer 1

From the docs

A connection to a replica set can be made using the MongoClient() constructor, specifying one or more members of the set, along with the replica set name.

mongoserver_uri = "mongodb://{0}:{1}@{2}:{3}/admin".format(
                    username, password, host, port)
self.log.info("------- Mongo Server URI: %s --------" % mongoserver_uri)
self.client = pymongo.MongoClient(host=mongoserver_uri, ssl=True,
                                  ssl_cert_reqs=ssl.CERT_NONE,
                                  replicaset='name_of_set')

只要您连接的服务器最初在线，MongoClient 就会找到副本集的所有成员，并在故障转移时自动尝试寻找新的主服务器。