TB Wiki

FlaskResearch

Here are some articles on flask:

How to install flash/gunicorn on Ubuntu 18.04 and use nginx as a reverse proxy:

https://linoxide.com/linux-how-to/install-flask-python-ubuntu/
- also has info on interacting with the firewall and setting up a systemd unit file

flask has a built-in web server, but it does not scale.

However a flask app IS a WSGI-compatible app.

See https://flask.palletsprojects.com/en/1.1.x/deploying/mod_wsgi/ for how to install a flash application with Apache and mod_wsgi (Apache is what I have on birdcloud.org)

Here's what I did on birdcloud:

$ sudo apt-get install libapache2-mod-wsgi -y
$ vi /var/www/owncloud/wsgy.py (see script for contents)
$ chown www-data:www-data /var/www/owncloud/wsgy.py
$ chmod 755 /var/www/owncloud/wsgy.py
$ echo "WSGIScriptAlias /wsgi /var/www/owncloud/wsgy.py" >/etc/apache2/conf-available/wsgi.conf
$ a2enconf wsgi
- (only need to run this once, to enable wsgi in apache configuration)
$ systemctl restart apache2
- (need to run this every time you change the wsgi.conf file)
$ browser https://birdcloud.org/wsgi

I made another script /var/www/owncloud/test_wsgi.py that mirrors the actions of /var/lib/cgi-bin/test_cgi.py

I did this in order to test responsiveness of cgi vs wsgi.

test.cgi loads in about 40 milliseconds
test_wsgi loads in about 9 milliseconds and that's with wsgi.mod_wsgi.script_reloading=1

See this information: