Automates the creation of an NGINX configuration for a virtual host that acts as a reverse proxy (Nginx as reverse proxy for Node js)

nginx-create-site.sh

#!/bin/bash

# Introduction: This script automates the creation of an NGINX configuration for a virtual host that acts as a reverse proxy.
# It is useful for setting up an NGINX domain as a reverse proxy for your Node.js app on a self-hosted env instead of have to use Versuck or Netlifsuck.
# The script automatically configures the domain for your Node.js app with SSL, optimized to work with Cloudflare SSL.
# Before you run this script, make sure to have: Nginx + Certbot installed + configured the domain first so that Certbot can obtain the SSL certificate.
# Usage: nginx-create-site your.domain.com --proxy=127.0.0.1:3000

DOMAIN=$1
PROXY_ARG=$2

if [[ -z "$DOMAIN" || -z "$PROXY_ARG" ]]; then
  echo "Usage: nginx-create-site your.domain.com --proxy=127.0.0.1:3000"
  exit 1
fi

PROXY_TARGET="${PROXY_ARG#--proxy=}"

NGINX_SITES_AVAILABLE="/etc/nginx/sites-available"
NGINX_SITES_ENABLED="/etc/nginx/sites-enabled"
NGINX_CONF="$NGINX_SITES_AVAILABLE/$DOMAIN"

echo "🔧 Creating NGINX config for $DOMAIN -> $PROXY_TARGET"

# Create config file
sudo tee "$NGINX_CONF" > /dev/null <<EOF
server {
    listen 80;
    server_name $DOMAIN;

    location / {
        proxy_pass http://$PROXY_TARGET;
        proxy_http_version 1.1;
        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;
    }
}
EOF

# Enable the site
sudo ln -sf "$NGINX_CONF" "$NGINX_SITES_ENABLED/$DOMAIN"

# Reload NGINX
echo "🔄 Reloading NGINX..."
sudo nginx -t && sudo systemctl reload nginx

# Install Certbot if not installed
if ! command -v certbot &> /dev/null; then
  echo "📦 Installing Certbot..."
  sudo apt update
  sudo apt install -y certbot python3-certbot-nginx
fi

# Get SSL Certificate
echo "🔐 Requesting Let's Encrypt certificate for $DOMAIN..."
sudo certbot --nginx -d "$DOMAIN" --non-interactive --agree-tos -m admin@$DOMAIN --redirect

echo "✅ $DOMAIN is now reverse-proxying to http://$PROXY_TARGET with SSL"