ufw is the firewall used on all our Linux servers.

Learning how it works is extremely important for security, since having it disabled will give bots, bad actors and script kiddies free reign.

It lets you easily add, change or remove rules to allow or deny access from all or specific IP addresses to any specified ports.

Basic Commands⌗

Check status and rules⌗

status verbose allows you to see a numbered list of rules

ufw status

ufw status verbose

Enable⌗ 

ufw enable

Disable⌗ 

ufw disable

Help⌗ 

ufw help

Reload⌗ 

ufw reload

Advanced Commands (Editing Firewall Rules)⌗

Check out DigitalOcean’s guide