build.txt

documentation on how to deploy:

install the dependencies

    sudo apt-get update
    sudo apt-get install python3-pip python3-dev nginx


create the folder

    mkdir flawcode.com
    cd flawcode.com
    mkdir logs

create the virtualenv

    sudo apt-get install python3-venv
    python3.5 -m venv venv
    source venv/bin/activate
    pip install flask gunicorn


the app

    from flask import Flask
    from werkzeug.contrib.fixers import ProxyFix
    app = Flask(__name__)
     
    @app.route('/')
    def hello():
        return "Hello world!"

    app.wsgi_app = ProxyFix(app.wsgi_app)
     
    if __name__ == '__main__':
        app.run()


run the gunicorn command

    (venv) joy@flawcode:~/flawcode.com$ gunicorn --bind 0.0.0.0:5000 hello:app
    [2017-04-17 07:47:46 +0000] [17832] [INFO] Starting gunicorn 19.7.1
    [2017-04-17 07:47:46 +0000] [17832] [INFO] Listening at: http://0.0.0.0:5000 (17832)
    [2017-04-17 07:47:46 +0000] [17832] [INFO] Using worker: sync
    [2017-04-17 07:47:46 +0000] [17835] [INFO] Booting worker with pid: 17835


create sites available flawcode

    joy@flawcode:~/flawcode.com$ sudo cat /etc/nginx/sites-available/flawcode.com
    server {
        listen 80;
        server_name 127.0.0.1;
 
        root /home/joy/flawcode.com/;
 
        access_log /home/joy/flawcode.com/logs/access.log;
        error_log /home/joy/flawcode.com/logs/error.log;
 
        location / {
            proxy_pass         http://127.0.0.1:5000/;
            proxy_redirect     off;

            proxy_set_header   Host                 $host;
            proxy_set_header   X-Real-IP            $remote_addr;
            proxy_set_header   X-Forwarded-For      $proxy_add_x_forwarded_for;
            proxy_set_header   X-Forwarded-Proto    $scheme;
        }
    }

create the link to sites enabled and delete the default

    sudo rm -v /etc/nginx/sites-enabled/default
    sudo ln -s /etc/nginx/sites-available/flawcode.com /etc/nginx/sites-enabled/


supervisor

    (venv) joy@flawcode:~/flawcode.com$ cat /etc/supervisor/conf.d/flawcode.conf
    [program:flawcode]
    command = /home/joy/flawcode.com/venv/bin/python /home/joy/flawcode.com/venv/bin/gunicorn -w 4 --bind 0.0.0.0:5000 hello:app
    directory = /home/joy/flawcode.com
    user = joy
    stdout_logfile = /home/joy/flawcode.com/logs/gunicorn_stdout.log
    stderr_logfile = /home/joy/flawcode.com/logs/gunicorn_stderr.log
    redirect_stderr = True
    environment = PRODUCTION=1



to restart supervisor

    sudo supervisorctl restart flawcode

So once you are done with changing the code and deploying to production git pull from upstream and then restart the supervisor

Next to change the firewall rules

references:
http://www.onurguzel.com/how-to-run-flask-applications-with-nginx-using-gunicorn/
https://realpython.com/blog/python/kickstarting-flask-on-ubuntu-setup-and-deployment/
https://www.digitalocean.com/community/tutorials/initial-server-setup-with-ubuntu-16-04
http://alexandersimoes.com/hints/2015/10/28/deploying-flask-with-nginx-gunicorn-supervisor-virtualenv-on-ubuntu.html
http://flask.pocoo.org/docs/0.12/deploying/wsgi-standalone/