redis.exceptions.ConnectionError：错误-2连接到本地主机：6379。姓名或服务未知 [英] redis.exceptions.ConnectionError: Error -2 connecting to localhost:6379. Name or service not known

问题描述

我在服务器中运行我的代码时出现此错误，我的env是debian， Python2.7.3

 回溯（最近一次调用）：
文件fetcher.py，第4行，在< module> 
 import mirad.fetcher_tasks as tasks 
文件/home/mirad/backend/mirad/fetcher_tasks.py，第75行，在< module> 
 redis_keys = r.keys（'*'）
文件/home/mirad/backend/venv/local/lib/python2.7/site-packages/redis/client.py，第863行，in keys 
 return self.execute_command（'KEYS'，pattern）
文件/home/mirad/backend/venv/local/lib/python2.7/site-packages/redis/client.py ，line 534，in execute_command 
 connection.send_command（* args）
文件/home/mirad/backend/venv/local/lib/python2.7/site-packages/redis/connection.py ，行532，在send_command 
 self.send_packed_command（self.pack_command（* args））
文件/home/mirad/backend/venv/local/lib/python2.7/site-packages/ redis / connection.py，行508，在send_packed_command 
 self.connect（）
文件/home/mirad/backend/venv/local/lib/python2.7/site-packages/redis/ connection.py，行412，在连接
 raise ConnectionError（self._error_message（e））
 redis.exceptions.ConnectionError：错误-2连接到本地主机：6379。姓名或服务未知。 
  

当我运行 redis-cli 正确无误：

  $ redis-cli 
 127.0.0.1:6379> 
  

解决方案

是你当前的Debian环境不明。
从Traceback，我看到你正在尝试使用主机名作为localhost连接，

  r_server = redis.Redis但是，您的系统无法理解localhost，因为您的系统无法识别localhost ，在host文件中输入，即说127.0.0.1是localhost。在/ etc / hosts中添加以下代码
  127.0.0.1 localhost 
  
否则使用以下命令连接redis：
  r_server = redis。 Redis（host =localhost，port = 6379）
  
 
I have this error when I run my code in server, my env is debian, and Python2.7.3
Traceback (most recent call last):
  File "fetcher.py", line 4, in <module>
    import mirad.fetcher_tasks as tasks
  File "/home/mirad/backend/mirad/fetcher_tasks.py", line 75, in <module>
    redis_keys = r.keys('*')
  File "/home/mirad/backend/venv/local/lib/python2.7/site-packages/redis/client.py", line 863, in keys
    return self.execute_command('KEYS', pattern)
  File "/home/mirad/backend/venv/local/lib/python2.7/site-packages/redis/client.py", line 534, in execute_command
    connection.send_command(*args)
  File "/home/mirad/backend/venv/local/lib/python2.7/site-packages/redis/connection.py", line 532, in send_command
    self.send_packed_command(self.pack_command(*args))
  File "/home/mirad/backend/venv/local/lib/python2.7/site-packages/redis/connection.py", line 508, in send_packed_command
    self.connect()
  File "/home/mirad/backend/venv/local/lib/python2.7/site-packages/redis/connection.py", line 412, in connect
    raise ConnectionError(self._error_message(e))
redis.exceptions.ConnectionError: Error -2 connecting to localhost:6379. Name or service not known.
when I run redis-cli it works correctly without any error:
$ redis-cli 
127.0.0.1:6379> 

解决方案
It seems that you are trying connect redis with server that is unidentified by your current Debian environment.
From Traceback, I see you are trying to connect using host name as  localhost ,
r_server=redis.Redis(host="localhost",port=6379)
But , your system is unable to understand "localhost" , make entry in hosts file i.e saying 127.0.0.1 is localhost. add below code in /etc/hosts
127.0.0.1 localhost
otherwise connect redis using below command ;
r_server=redis.Redis(host="localhost",port=6379) 


                        
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