March 2021
Intermediate to advanced
704 pages
18h 20m
English
Content preview from Red Hat RHCSA 8 Cert Guide: EX200, 2nd Edition
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Chapter 23
Configuring a Firewall
The following topics are covered in this chapter:
The following RHCSA exam objective is covered in this chapter:
Restrict network access using firewall-cmd/firewall
If a server is connected to the Internet, it needs to be protected against unauthorized access. SELinux is one part of this protection as discussed in Chapter 22, “Managing SELinux,” and a firewall is the second part. The Linux kernel implements firewalling via the netfilter framework. To configure which packets are allowed and which are not, Firewalld is the default solution in RHEL 8. In this chapter, you learn how a basic Firewalld configuration is created in an RHEL 8 environment.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.