title: requests.exceptions.ConnectionError: ('Connection aborted.', error(2, 'No such file or directory'))
body: <p>The following error occurred when I ran a Python program from the command line:</p>
  
  <pre><code>File "manager/start_server.py", line 6, in &lt;module&gt;
      from manager.responses import start_response
    File "/home/rj/dlruijie/slave-server/manager/responses.py", line 20, in &lt;module&gt;
      CONTAINER_OBJ = Containers()
    File "/home/rj/dlruijie/slave-server/manager/node.py", line 157, in __init__
      self.client.version()
    File "/usr/lib/python2.7/site-packages/docker/client.py", line 171, in version
      return self.api.version(*args, **kwargs)
    File "/usr/lib/python2.7/site-packages/docker/api/daemon.py", line 159, in version
      return self._result(self._get(url), json=True)
    File "/usr/lib/python2.7/site-packages/docker/utils/decorators.py", line 47, in inner
      return f(self, *args, **kwargs)
    File "/usr/lib/python2.7/site-packages/docker/api/client.py", line 183, in _get
      return self.get(url, **self._set_request_timeout(kwargs))
    File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 521, in get
      return self.request('GET', url, **kwargs)
    File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 508, in request
      resp = self.send(prep, **send_kwargs)
    File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 618, in send
      r = adapter.send(request, **kwargs)
    File "/usr/lib/python2.7/site-packages/requests/adapters.py", line 490, in send
      raise ConnectionError(err, request=request)
  requests.exceptions.ConnectionError: ('Connection aborted.', error(2, 'No such file or directory'))
  </code></pre>
  
  <p>It happens a lot.But the first time I put the program on the server, I didn't have this error.</p>