socket.gaierror: [Errno 8] nodename nor servname provided, or not known in flask app

Question

I followed the steps mentioned in https://developers.openshift.com/en/python-flask.html to create a sample flask application.

When I am trying to run wsgi.py on my local mac machine. I am getting the following error.

Traceback (most recent call last):
  File "wsgi.py", line 24, in <module>
    httpd = make_server('localhost', 10000, application)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/wsgiref/simple_server.py",
line 144, in make_server server = server_class((host, port), handler_class) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/SocketServer.py", line 419, in init self.server_bind() File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/wsgiref/simple_server.py", line 48, in server_bind HTTPServer.server_bind(self) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/BaseHTTPServer.py", line 108, in server_bind SocketServer.TCPServer.server_bind(self) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/SocketServer.py", line 430, in server_bind self.socket.bind(self.server_address) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 224, in meth return getattr(self._sock,name)(*args) socket.gaierror: [Errno 8] nodename nor servname provided, or not known

Can you please also show your code that is causing the error? My suspicion is you are passing 'localhost' and 10000 as separate parameters as opposed to a tuple ('localhost', 10000) as expected, but can't say so without your actual code that's causing this exception — gabhijit
if name == 'main': from wsgiref.simple_server import make_server httpd = make_server('localhost', 8051, application) httpd.serve_forever() — Abhishek
As you found the lines to create httpd object and run it should only be run on your local machine and should be guarded by check of __name__ being __main__. When deploying as a wsgi.py file to OpenShift, it will run under mod_wsgi and all it wants is that there is a WSGI application entry point in the file called application. You should not start your own WSGI server if using wsgi.py. — Graham Dumpleton
Please take a look at this documentation developers.openshift.com/en/python-flask.html . I am using the same code. — Abhishek
Sorry, confusion on my part. I thought you were getting this on OpenShift. Didn't see that you said on your own machine. Try changing 'localhost' to an empty string instead. I have seen in some situations that MacOS X doesn't like being told to bind to 'localhost'. — Graham Dumpleton

edison_vs_tesla edison_vs_tesla · Accepted Answer · 2016-02-02T17:36:45

Problem for me was using a non-standard port. Had to define my port separately from the host.

    self.config = {
        'user': 'root',
        'password': 'root',
        'host': '127.0.0.1',
        'port': 8889,
        'database': 'ET_Toolbox',
        'charset': 'utf8'
    }

socket.gaierror: [Errno 8] nodename nor servname provided, or not known in flask app

1 Answers