Performing Initial Firewall Configuration

In this lab, you will need to perform a few simple firewall configurations. These configurations include replacing all ports with services, adding the eth0 interface to the default zone, creating a firewalld service for flaskapp.py, changing the port of SSH service from 22 to 61613, and reloading firewalld to apply all the rules. By the end of the lab, it is important to not have any port definitions within the firewall configuration and to ensure that everything is defined with a service. The benefit of these services is that they have a name and a description by which you or anybody can know what the port is used for. Otherwise, you may find yourself in a situation where there are many opened ports and not know what the purpose of each port is. In order to be able to replace all ports with service, you first need to create a firewalld service for flaskapp.py. After that, you will need to change the port of SSH service from port 22 to port 61613. Finally, after all changes are made, you need to reload to apply all the rules.