How to Set Up Python with Gunicorn and Nginx

Install Python

apt update
apt install python3 python3-pip python3-venv -y

mkdir /var/www/myapp && cd /var/www/myapp

python3 -m venv venv
source venv/bin/activate

pip install flask gunicorn

Create a Systemd Service for Gunicorn

Create /etc/systemd/system/myapp.service:

[Unit]
Description=My Python App
After=network.target

[Service]
User=www-data
WorkingDirectory=/var/www/myapp
ExecStart=/var/www/myapp/venv/bin/gunicorn --workers 3 --bind 127.0.0.1:8000 app:app
Restart=always

[Install]
WantedBy=multi-user.target

systemctl daemon-reload
systemctl start myapp
systemctl enable myapp

Configure Nginx as Reverse Proxy

Add to your Nginx site config:

location / {
    proxy_pass http://127.0.0.1:8000;
    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;
}

systemctl reload nginx