flask-playground

• install flask:

   python -m pip install flask 

• running flask app (only for development purposes):

   $ export FLASK_APP=flashcards.py 
   $ export FLASK_ENV=development 
   $ flask run
   # or
   $ python –m flask run 

  -For windows, use set instead of export-

• overview of the app (which methods and functionaliy are available):

  • go to the direcroy and start python in the terminal (IDE terminal or Standalone terminal)

   $ python
   $ import flashcards
   $ flashcards.app.url_map

• usual communication model in MVC or MTV (Model-Template-View):

• running flask app without using a package (production environment):

  • download the code on the server

   $ pip3 install -r requirements.txt
   $ sudo apt install gunicorn3
   $ gunicorn3 -D flashcards:app
   # now the deamon is running on port 8000
   # we need to use nginx tp have a reverse proxy
   $ cd /etc/nginx/sites-available/
   # get settings from : https://gunicorn.org/#deployment
   # change server_name and access_log 
   $ sudo nano default 
     server {
         listen 80;
         server_name example.org;
         access_log  /var/log/nginx/example.log;
  
         location / {
             proxy_pass http://127.0.0.1:8000;
             proxy_set_header Host $host;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            }
    }
   
   $ sudo service nginx restart