title: Redis Error 8 connecting localhost:6379. nodename nor servname provided, or not known
body: <p>My environment is Mac OS 10.9.2, python3.3, redis-2.6.9 (64-bit).</p>
  
  <p>I have many threads (nealy 2000) that use the same redis instance to write data, but some threads throw the following exceptions:</p>
  
  <pre><code>During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "/usr/local/lib/python3.3/site-packages/redis/connection.py", line 250, in connect
      sock = self._connect()
    File "/usr/local/lib/python3.3/site-packages/redis/connection.py", line 268, in _connect
      self.socket_timeout)
    File "/usr/local/Cellar/python3/3.3.4/Frameworks/Python.framework/Versions/3.3/lib/python3.3/socket.py", line 417, in create_connecti
  on
      for res in getaddrinfo(host, port, 0, SOCK_STREAM):
  socket.gaierror: [Errno 8] nodename nor servname provided, or not known
  
  Traceback (most recent call last):
    File "/usr/local/Cellar/python3/3.3.4/Frameworks/Python.framework/Versions/3.3/lib/python3.3/threading.py", line 901, in _bootstrap_i
  nner
      self.run()
    File "/usr/local/Cellar/python3/3.3.4/Frameworks/Python.framework/Versions/3.3/lib/python3.3/threading.py", line 858, in run
      self._target(*self._args, **self._kwargs)
    File "proxypool.py", line 289, in _efficiency_proxy
      self.rdb.zadd(db_proxy, time_delay, proxy)
    File "/usr/local/lib/python3.3/site-packages/redis/client.py", line 1345, in zadd
      return self.execute_command('ZADD', name, *pieces)
    File "/usr/local/lib/python3.3/site-packages/redis/client.py", line 464, in execute_command
      connection.send_command(*args)
    File "/usr/local/lib/python3.3/site-packages/redis/connection.py", line 334, in send_command
      self.send_packed_command(self.pack_command(*args))
    File "/usr/local/lib/python3.3/site-packages/redis/connection.py", line 316, in send_packed_command
      self.connect()
    File "/usr/local/lib/python3.3/site-packages/redis/connection.py", line 253, in connect
      raise ConnectionError(self._error_message(e))
  redis.exceptions.ConnectionError: Error 8 connecting localhost:6379. nodename nor servname provided, or not known.
  </code></pre>
  
  <p>Is there some way to solve this problem?<br>
  I tried to connect to redis server when this exception happens and use <code>ulimit -n</code> to set a larger number, but the two methods don't work. </p>