Installing and setting up UFW firewall on Ubuntu

Installing the UFW firewall package

sudo apt-get update
sudo apt-get install ufw

Allowing SSH through the firewall

Important! After the firewall is installed, the first you should do is allow SSH access before enabling it. Big problem if you don’t!

Issue the following command:

sudo ufw allow ssh

If you have a web server such as Apache, you will also want to allow that to be accessed through the firewall. Note: this is not a full guide on what should and shouldn’t be allowed, but you can see how to allow Apache here.

Enable UFW

Now to enable the firewall.

sudo ufw enable

That’s it. Simple.