Summary
Security is a very important part of system administration. Disabling the security measures on a system just because it’s in an isolated network goes against the defense in depth principle, so this is heavily discouraged.
In this chapter, we saw how simple and easy it is to configure a firewall using firewalld in RHEL 9, thus providing us with another tool to manage, filter, and secure the network connections in our system. We also worked with cockpit, a web administration tool that makes this task more visual and easier to perform.
We can now take control of the network connectivity of our systems, provide access to the services we want to provide, and add a layer of security to them. We also know how to manage zones and how to use them, depending on our system’s use case. We are now ready to define our own custom services so that we can always filter network connectivity for them. We can now also deploy more secure systems by using the firewall included...