Apache meet Python Flask

Ben Lee
March 31, 2016

This guide covers installing and configuring Flask to run on Apache on Ubuntu. Why would you want to do this? In a nutshell, you want to run Python code in a web environment.


  • AWS EC2 running Ubuntu Server 14


Installing the software

SSH onto your EC2 instance and run the following commands.
This will install and enable the following components to get everything:

sudo su
apt-get update
apt-get install apache2 python-pip libapache2-mod-wsgi
pip install Flask

Setting up a test program

Create a directory called Flask under /var/www

mkdir /var/www/flask

Create the file /var/www/flask/webtool.py with the following contents

from flask import Flask
app = Flask(__name__)
def hello():
return "Hello world!"
if __name__ == "__main__":

Next create the file /var/www/flask/webtool.wsgi with following contents

import sys
from webtool import app as application

Configuring Apache

Edit the following /etc/apache2/sites-available/000-default.conf and insert the following content between the virtual host tags. This will instruct Apache to start a daemon that will interact with Python when URL requests are sent to http://<IP Address of Server>/flask

WSGIDaemonProcess webtool user=ubuntu group=ubuntu threads=5 home=/var/www/flask/
WSGIScriptAlias /flask /var/www/flask/webtool.wsgi
<directory /var/www/flask>
WSGIProcessGroup webtool
WSGIApplicationGroup %{GLOBAL}
WSGIScriptReloading On
Order deny,allow
Allow from all

Restart Apache

service apache2 restart


Using your web browser go to the following URL  http://<IP Address of Server>/flask
All going well you should see the following web page and our faithful friend “Hello world!”


Source: OptimalBI


The first place to check will be the apache log files.  By default, they can be found here /var/log/apache2/ check the error.log file for any useful information.
The second suggestion I would have is to make sure that the user and group used in the Apache configuration is a valid user and group. if not change them to valid values

WSGIDaemonProcess webtool user=ubuntu group=ubuntu threads=5 home=/var/www/flask/

All the code, all the fun – Ben

Ben writes blogs on the technical side of BI, the code, all the code and not much other than the code.

Connect with Ben on LinkedIn or read some of his other blogs here.

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