You're reading from Red Hat Enterprise Linux 8 Administration Master Linux administration skills and prepare for the RHCSA certification exam

Product type Paperback

Published in Nov 2021

Publisher Packt

ISBN-13 9781800569829

Length 534 pages

Edition 1st Edition

Tools

Linux

Concepts

System Administration

Authors (3):

Scott McCarty

Pablo Iranzo Gómez

Miguel Pérez Colino

View More author details

Table of Contents (25) Chapters

Preface

1. Section 1: Systems Administration – Software, User, Network, and Services Management

2. Chapter 1: Installing RHEL8 FREE CHAPTER

3. Chapter 2: RHEL8 Advanced Installation Options

4. Chapter 3: Basic Commands and Simple Shell Scripts

5. Chapter 4: Tools for Regular Operations

6. Chapter 5: Securing Systems with Users, Groups, and Permissions

7. Chapter 6: Enabling Network Connectivity

8. Chapter 7: Adding, Patching, and Managing Software

9. Section 2: Security with SSH, SELinux, a Firewall, and System Permissions

10. Chapter 8: Administering Systems Remotely

11. Chapter 9: Securing Network Connectivity with firewalld

12. Chapter 10: Keeping Your System Hardened with SELinux

13. Chapter 11:System Security Profiles with OpenSCAP

14. Section 3: Resource Administration – Storage, Boot Process, Tuning, and Containers

15. Chapter 12: Managing Local Storage and Filesystems

16. Chapter 13: Flexible Storage Management with LVM

17. Chapter 14: Advanced Storage Management with Stratis and VDO

18. Chapter 15: Understanding the Boot Process

19. Chapter 16: Kernel Tuning and Managing Performance Profiles with tuned

20. Chapter 17: Managing Containers with Podman, Buildah, and Skopeo

21. Section 4: Practical Exercises

22. Chapter 18: Practice Exercises – 1

23. Chapter 19: Practice Exercise – 2

24. Other Books You May Enjoy

Enabling firewalld in the system and reviewing the default zones

We have already seen that firewalld is enabled by default in the system. However, we may need to disable (that is, check if the firewall is interfering with a service), re-enable (that is, after restoring configuration files), and start and stop it (that is, to reload configuration or to do a quick check). This tasks are managed like any other service in the system; that is, using systemctl. Let's stop the firewalld service:

[root@rhel8 ~]# systemctl stop firewalld
[root@rhel8 ~]# systemctl status firewalld
  firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Sun 2021-02-28 17:36:45 CET; 4s ago
     Docs: man:firewalld(1)
  Process: 860 ExecStart=/usr/sbin/firewalld --nofork --nopid $FIREWALLD_ARGS (code=exited...

The rest of the chapter is locked

You're reading from Red Hat Enterprise Linux 8 Administration Master Linux administration skills and prepare for the RHCSA certification exam

Table of Contents (25) Chapters

Enabling firewalld in the system and reviewing the default zones

Unlock this book and the full library FREE for 7 days

Authors (3)

Personalised recommendations for you