Firewalld on Ubuntu

Overview
Installation instructions for firewall on Ubuntu

Prerequisites

• Must remove UFW (see below)

Steps

1. Remove UFW if Installed
   UFW is installed by default on Ubuntu systems, though it must be enabled manually. Before getting started with firewalld, remove ufw.

2. Install Firewalld
   Firewalld is one of the Linux firewall management tool and it is available on the in the Ubuntu’s default repositories, therefore it is available to be installed from these repositories using the apt packaging system.

3. Enable Firewalld
The first thing that needs to be done is to enable the firewalld. By default, it should be enabled.

4. Start Firewalld
Next step is to start the service if is not ready started.

5. Check Firewalld
To confirm that the service is running, execute the following command:

6. Using Firewalld on Ubuntu
After the installation is finished is time to move on configurations. Take a look at the RHEL Firewalld page for configuration examples.