This is the Flaskr tutorial application from the Flask documentation (as of version 0.12, found at http://flask.pocoo.org/docs/0.12/tutorial/), written from scratch. Additional files were added to allow for this Flask application to run using Apache 2.4 + mod_wsgi. Implementation was successful on a Raspberry Pi Zero hooked to the internet through a regular home ISP router.

Some design considerations (as this is a tutorial, you may have particular interest in this details):

• Flaskr app is implemented using a Python virtual enviroment (virtualenv). This is the recommended way of doing things, as usual.
• A separate Apache site configuration file is used for the Flaskr app setup.
• The home router blocks outgoing connections on port 80, so a different port was used. 1096 in this case, but any other non-reserved number should do. Don't forget to open such port in the router firewall and forward it to the server in use (Raspberry Pi in this case).

Installation

This steps assume you wish to run the app with Apache + wgsi. If you just want to test it, just download the code and follow the usual flask run steps.

• Install Apache in your server (doh!)
• Install mod_wsgi module. In Debian-based distributions:
  • (sudo) apt-get install libapache2-mod-wsgi
• In /etc/apache2/ports.conf add your port number:
  • Add "Listen 1096"
• Create a site configuration file. E.g., /etc/apache2/sites-available/005-flask-test.conf. Used the one in apache/ as a reference.
• Enable the new site:
  • sudo a2ensite 005-flask-test
• Get a copy of the source code by using git clone or similar into the folder you choose. In this example, /var/www/ was used. Edit the flaskr.wsgi and site config file accordingly.
• In the new <app root>/flaskr/ folder create a virtual environment:
  • virtualenv venv
• Activate the virtual environment and install the app:
  • source /venv/bin/activate
  • pip install . (pip install --editable . if you want to change the code in place)
• Change file permissions to ensure webserver user can write to the flaskr.db database file (file and containing folder!)
• Restart web server!
  • sudo service apache2 restart
• In your web browser head to http://<your address>:1096