nano ~/myproject/myproject.py

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "
Hello There!
"

if __name__ == "__main__":
    app.run(host='0.0.0.0')

sudo ufw allow 5000

python myproject.py

Output* Serving Flask app "myproject" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)

http://your_server_ip:5000

nano ~/myproject/wsgi.py

from myproject import app

if __name__ == "__main__":
    app.run()

cd ~/myproject
gunicorn --bind 0.0.0.0:5000 wsgi:app

Output[2018-07-13 19:35:13 +0000] [28217] [INFO] Starting gunicorn 19.9.0
[2018-07-13 19:35:13 +0000] [28217] [INFO] Listening at: http://0.0.0.0:5000 (28217)
[2018-07-13 19:35:13 +0000] [28217] [INFO] Using worker: sync
[2018-07-13 19:35:13 +0000] [28220] [INFO] Booting worker with pid: 28220

http://your_server_ip:5000

deactivate

sudo nano /etc/systemd/system/myproject.service

[Unit]
Description=Gunicorn instance to serve myproject
After=network.target

[Unit]
Description=Gunicorn instance to serve myproject
After=network.target

[Service]
User=sammy
Group=www-data

[Unit]
Description=Gunicorn instance to serve myproject
After=network.target

[Service]
User=sammy
Group=www-data
WorkingDirectory=/home/sammy/myproject
Environment="PATH=/home/sammy/myproject/myprojectenv/bin"
ExecStart=/home/sammy/myproject/myprojectenv/bin/gunicorn --workers 3 --bind unix:myproject.sock -m 007 wsgi:app

[Unit]
Description=Gunicorn instance to serve myproject
After=network.target

[Service]
User=sammy
Group=www-data
WorkingDirectory=/home/sammy/myproject
Environment="PATH=/home/sammy/myproject/myprojectenv/bin"
ExecStart=/home/sammy/myproject/myprojectenv/bin/gunicorn --workers 3 --bind unix:myproject.sock -m 007 wsgi:app

[Install]
WantedBy=multi-user.target

sudo systemctl start myproject
sudo systemctl enable myproject

sudo systemctl status myproject

Output● myproject.service - Gunicorn instance to serve myproject
   Loaded: loaded (/etc/systemd/system/myproject.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2018-07-13 14:28:39 UTC; 46s ago
 Main PID: 28232 (gunicorn)
    Tasks: 4 (limit: 1153)
   CGroup: /system.slice/myproject.service
           ├─28232 /home/sammy/myproject/myprojectenv/bin/python3.6 /home/sammy/myproject/myprojectenv/bin/gunicorn --workers 3 --bind unix:myproject.sock -m 007
           ├─28250 /home/sammy/myproject/myprojectenv/bin/python3.6 /home/sammy/myproject/myprojectenv/bin/gunicorn --workers 3 --bind unix:myproject.sock -m 007
           ├─28251 /home/sammy/myproject/myprojectenv/bin/python3.6 /home/sammy/myproject/myprojectenv/bin/gunicorn --workers 3 --bind unix:myproject.sock -m 007
           └─28252 /home/sammy/myproject/myprojectenv/bin/python3.6 /home/sammy/myproject/myprojectenv/bin/gunicorn --workers 3 --bind unix:myproject.sock -m 007

sudo nano /etc/nginx/sites-available/myproject

server {
    listen 80;
    server_name your_domain www.your_domain;
}

server {
    listen 80;
    server_name your_domain www.your_domain;

    location / {
        include proxy_params;
        proxy_pass http://unix:/home/sammy/myproject/myproject.sock;
    }
}

sudo ln -s /etc/nginx/sites-available/myproject /etc/nginx/sites-enabled

sudo nginx -t

sudo systemctl restart nginx

sudo ufw delete allow 5000
sudo ufw allow 'Nginx Full'

http://your_domain

sudo add-apt-repository ppa:certbot/certbot

sudo apt install python-certbot-nginx

sudo certbot --nginx -d your_domain -d www.your_domain

OutputPlease choose whether or not to redirect HTTP traffic to HTTPS, removing HTTP access.
-------------------------------------------------------------------------------
1: No redirect - Make no further changes to the webserver configuration.
2: Redirect - Make all requests redirect to secure HTTPS access. Choose this for
new sites, or if you're confident your site works on HTTPS. You can undo this
change by editing your web server's configuration.
-------------------------------------------------------------------------------
Select the appropriate number [1-2] then [enter] (press 'c' to cancel):

OutputIMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/your_domain/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/your_domain/privkey.pem
   Your cert will expire on 2018-07-23. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot again
   with the "certonly" option. To non-interactively renew *all* of
   your certificates, run "certbot renew"
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

sudo ufw delete allow 'Nginx HTTP'

https://your_domain