How to Configure a Firewall

A firewall controls incoming and outgoing network traffic. This article covers basic firewall configuration using UFW on Ubuntu/Debian and firewalld on CentOS/RHEL.

Using UFW (Ubuntu/Debian)

Enable UFW:

sudo ufw enable

Allow SSH:

sudo ufw allow 22/tcp

Allow HTTP and HTTPS:

sudo ufw allow 80/tcp
sudo ufw allow 443/tcp

Check status:

sudo ufw status

Using firewalld (CentOS/RHEL)

Enable firewalld:

sudo systemctl enable firewalld
sudo systemctl start firewalld

Allow SSH:

sudo firewall-cmd --permanent --add-service=ssh
sudo firewall-cmd --reload

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  • firewall, ufw, iptables
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