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

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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

Working with GRUB, the bootloader, and initrd system images

Once the pre-boot execution is completed, the system will be running the GRUB bootloader.

GRUB has the mission to load the main file of an operating system, the kernel, pass parameters and options to it, and load the initial RAM disk, also known as initrd.

GRUB can be installed by using the grub2-install command. We will need to know which disk device will be used to boot, in this case, /dev/vda:

[root@rhel8 ~]# grub2-install /dev/vda
Installing for i386-pc platform.
Installation finished. No error reported.

Important note

You should point grub-install to the disk you will use to boot the system, the same one that you configured in the BIOS/UEFI to boot from.

This is intended to be used to manually rebuild a system or to fix a broken boot.

GRUB files are stored in /boot/grub2. The main configuration file is /boot/grub2/grub.cfg; however, if you take a close look at this file you will see the following...

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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

Working with GRUB, the bootloader, and initrd system images

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Authors (3)

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