Book Image

Linux Service Management Made Easy with systemd

4.5 (2)
Book Image

Linux Service Management Made Easy with systemd

4.5 (2)

Overview of this book

Linux Service Management Made Easy with systemd will provide you with an in-depth understanding of systemd, so that you can set up your servers securely and efficiently.This is a comprehensive guide for Linux administrators that will help you get the best of systemd, starting with an explanation of the fundamentals of systemd management.You’ll also learn how to edit and create your own systemd units, which will be particularly helpful if you need to create custom services or timers and add features or security to an existing service. Next, you'll find out how to analyze and fix boot-up challenges and set system parameters. An overview of cgroups that'll help you control system resource usage for both processes and users will also be covered, alongside a practical demonstration on how cgroups are structured, spotting the differences between cgroups Version 1 and 2, and how to set resource limits on both. Finally, you'll learn about the systemd way of performing time-keeping, networking, logging, and login management. You'll discover how to configure servers accurately and gather system information to analyze system security and performance. By the end of this Linux book, you’ll be able to efficiently manage all aspects of a server running the systemd init system.
Table of Contents (23 chapters)
1
Section 1: Using systemd
12
Section 2: Understanding cgroups
16
Section 3: Logging, Timekeeping, Networking, and Booting

Chapter 8: Understanding the systemd Boot Process

In this chapter, we'll take a brief look at the systemd boot process. Now, you might think that this would be a bit dull, but I can assure you that it won't be. Rather than lead you through a dull slog about all that happens during bootup, my aim is to give you practical information that can make bootups run more efficiently. After that, I'll show you some ways in which systemd has been made somewhat backward-compatible with the legacy System V (SysV) stuff. Specific topics in this chapter include the following:

  • Comparing SysV bootup and systemd bootup
  • Analyzing bootup performance
  • Some differences on Ubuntu Server 20.04
  • Understanding systemd generators

Note that we won't be talking about bootloaders in this chapter because we're saving that for later.

All right—if you're ready, let's get started.