UFW Firewall: Essential VPS Security

What is UFW?

UFW (Uncomplicated Firewall) is a user-friendly front-end for iptables. It's the easiest way to secure your VPS.

Setup

sudo ufw allow 22/tcp    # SSH
sudo ufw allow 80/tcp    # HTTP
sudo ufw allow 443/tcp   # HTTPS
sudo ufw enable

Common Commands

sudo ufw status            # Check status
sudo ufw allow 3306/tcp    # MySQL
sudo ufw deny 8080         # Block port
sudo ufw delete allow 3306 # Remove rule