02 mongo使用副本集时连接报错
mongo 使用副本集时连接报错¶
问题描述¶
mongo部署方案
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副本集 ：rs0
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部署方式： docker
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连接方式： pymongo
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脚本：
from pymongo import MongoClient # 连接到MongoDB实例 client = MongoClient('mongodb://localhost:27017/') # 使用admin数据库 db = client['admin'] # 查询服务器状态 server_status = db.command('serverStatus') # 打印服务器状态信息 print(server_status) -
报错如下：
$ server_status = db.command('serverStatus')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib64/python3.9/site-packages/pymongo/_csot.py", line 108, in csot_wrapper
return func(self, *args, **kwargs)
File "/usr/local/lib64/python3.9/site-packages/pymongo/database.py", line 893, in command
with self.__client._conn_for_reads(read_preference, session, operation=command_name) as (
File "/usr/local/lib64/python3.9/site-packages/pymongo/mongo_client.py", line 1375, in _conn_for_reads
server = self._select_server(read_preference, session, operation)
File "/usr/local/lib64/python3.9/site-packages/pymongo/mongo_client.py", line 1322, in _select_server
server = topology.select_server(
File "/usr/local/lib64/python3.9/site-packages/pymongo/topology.py", line 368, in select_server
server = self._select_server(
File "/usr/local/lib64/python3.9/site-packages/pymongo/topology.py", line 346, in _select_server
servers = self.select_servers(
File "/usr/local/lib64/python3.9/site-packages/pymongo/topology.py", line 253, in select_servers
server_descriptions = self._select_servers_loop(
File "/usr/local/lib64/python3.9/site-packages/pymongo/topology.py", line 303, in _select_servers_loop
raise ServerSelectionTimeoutError(
pymongo.errors.ServerSelectionTimeoutError: Could not reach any servers in [('mongo', 27017)]. Replica set is configured with internal hostnames or IPs?, Timeout: 30s, Topology Description: <TopologyDescription id: 66bc5c2bc962cd21a880378c, topology_type: ReplicaSetNoPrimary, servers: [<ServerDescription ('mongo', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('mongo:27017: [Errno -3] Temporary failure in name resolution (configured timeouts: socketTimeoutMS: 20000.0ms, connectTimeoutMS: 20000.0ms)')>]>
解决方案¶
1、连接时指定：directConnection=true
directConnection=true
2、 对于副本集来说， 主节点是自动选举出来的；
- 单节点副本集无法自动选举主节点
- 多节点副本集可以通过调整优先级来干预自动选举主节点
参考文档