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

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 RHEL8, the PID 1 is run by systemd.

In Chapter 4, Tools for Regular Operations, we described services and targets management with systemd. Let's review in this chapter its 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 it with the systemctl tool:

[root@rhel8 ~]# systemctl reboot

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

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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

Managing the boot sequence with systemd

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