You're reading from Red Hat Enterprise Linux 9 Administration A comprehensive Linux system administration guide for RHCSA certification exam candidates

Product type Paperback

Published in Nov 2022

Publisher Packt

ISBN-13 9781803248806

Length 530 pages

Edition 2nd Edition

Languages

C++

Tools

Linux

Concepts

System Administration

Authors (4):

Scott McCarty

Miguel Pérez Colino

Pedro Ibañez Requena

Pablo Iranzo Gómez

View More author details

Table of Contents (26) Chapters

Preface

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

2. Chapter 1: Getting RHEL Up and Running FREE CHAPTER

3. Chapter 2: RHEL 9 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. Part 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. Part 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. Part 4 – Practical Exercises

22. Chapter 18: Practice Exercises – 1

23. Chapter 19: Practice Exercise – 2

24. Index

Why subscribe?

25. Other Books You May Enjoy

Managing the boot sequence with systemd

We have already learned how the firmware of the system will take care of pointing at a disk to run the operating system loader, which, in RHEL, is GRUB.

GRUB will load the kernel and initrd to prepare the system to start. Then, it’s time to start the first process of the system, also referred to as process 1 or PID 1 (PID stands for process identifier). This process has to take care of loading all the required services in the system efficiently. In RHEL 9, the PID 1 is run by systemd.

In Chapter 4, Tools for Regular Operations, we described service and target management with systemd. In this chapter, let’s review these interactions with the boot sequence.

The first two things related to the boot sequence that we can do with systemd are to reboot the system and to power it off. We will do this with the systemctl tool:

[root@rhel-instance ~]# systemctl reboot

We can see that the system will reboot. We can check how...

The rest of the chapter is locked

You're reading from Red Hat Enterprise Linux 9 Administration A comprehensive Linux system administration guide for RHCSA certification exam candidates

Table of Contents (26) Chapters

Managing the boot sequence with systemd

Unlock this book and the full library FREE for 7 days

Authors (4)

Personalised recommendations for you