Panduan Mudah Menerapkan Aplikasi Flask di Linux Bonus Nginx Web Server

1. Cara Pasang Flask di Ubuntu

root@ns5:~# mkdir -p /var/pythonenv
root@ns5:~# cd /var/pythonenv
root@ns5:/var/pythonenv# python3 -m venv flaskfraework

root@ns5:/var/pythonenv# source flaskfraework/bin/activate
(flaskfraework) root@ns5:/var/pythonenv#

(flaskfraework) root@ns5:/var/pythonenv# python3 -V
Python 3.10.12 

(flaskfraework) root@ns5:/var/pythonenv# pip install Flask

(flaskfraework) root@ns5:/var/pythonenv# python -m flask --version
Python 3.10.12
Flask 3.0.3
Werkzeug 3.0.2

2. Cara Buat aplikasi dengan Flask

(flaskfraework) root@ns5:/var/pythonenv# cd flaskfraework
(flaskfraework) root@ns5:/var/pythonenv/flaskfraework# touch udinsedunia.py
(flaskfraework) root@ns5:/var/pythonenv/flaskfraework# nano udinsedunia.py
from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello():
    return '"Selamat Pagi Udin, Apakah kamu sudah sarapan?."'

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

export FLASK_APP=(flaskfraework) root@ns5:/var/pythonenv/flaskfraework# export FLASK_APP=udinsedunia.py
(flaskfraework) root@ns5:/var/pythonenv/flaskfraework# flask run
 * Serving Flask app 'udinsedunia.py'
 * Debug mode: off
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
 * Running on http://127.0.0.1:5000
Press CTRL+C to quit

3. Cara Buat Reverse Proxy Nginx

root@ns5:~# cd /etc/nginx/sites-available
root@ns5:/etc/nginx/sites-available# nano default
server {
    listen 80;
    server_name 192.168.7.3;

    location / {
        proxy_pass http://127.0.0.1:5000;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

root@ns5:/etc/nginx/sites-available# systemctl restart nginx