How do I get Flask to run on port 80?

quantumtremor picture quantumtremor · Nov 26, 2013 · Viewed 430.4k times · Source

I have a Flask server running through port 5000, and it's fine. I can access it at http://example.com:5000

But is it possible to simply access it at http://example.com? I'm assuming that means I have to change the port from 5000 to 80. But when I try that on Flask, I get this error message when I run it.

Traceback (most recent call last):
  File "xxxxxx.py", line 31, in <module>
app.run(host="0.0.0.0", port=int("80"), debug=True)
   File "/usr/local/lib/python2.6/dist-packages/flask/app.py", line 772, in run
run_simple(host, port, self, **options)
  File "/usr/local/lib/python2.6/dist-packages/werkzeug/serving.py", line 706, in run_simple
    test_socket.bind((hostname, port))
  File "<string>", line 1, in bind
socket.error: [Errno 98] Address already in use

Running lsof -i :80 returns

COMMAND   PID     USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
apache2   467     root    3u  IPv4 92108840      0t0  TCP *:www (LISTEN)
apache2  4413 www-data    3u  IPv4 92108840      0t0  TCP *:www (LISTEN)
apache2 14346 www-data    3u  IPv4 92108840      0t0  TCP *:www (LISTEN)
apache2 14570 www-data    3u  IPv4 92108840      0t0  TCP *:www (LISTEN)
apache2 14571 www-data    3u  IPv4 92108840      0t0  TCP *:www (LISTEN)
apache2 14573 www-data    3u  IPv4 92108840      0t0  TCP *:www (LISTEN)

Do I need to kill these processes first? Is that safe? Or is there another way to keep Flask running on port 5000 but have the main website domain redirect somehow?

Answer

Amir Mofakhar picture Amir Mofakhar · Mar 16, 2015

1- Stop other applications that are using port 80. 2- run application with port 80 :

if __name__ == '__main__':
      app.run(host='0.0.0.0', port=80)