Book Image

Linux Service Management Made Easy with systemd

4 (1)
Book Image

Linux Service Management Made Easy with systemd

4 (1)

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 11: Understanding cgroups Version 1

In this chapter, we'll introduce you to Control Groups, more commonly called cgroups. (More specifically, we'll be looking at cgroups Version 1.) You'll learn what cgroups are, how they're constructed, and how you can benefit by taking advantage of them. We'll also briefly look at the history of cgroups.

Now, I have to tell you that discussing cgroups can become quite complex and convoluted. You might have already seen some online cgroups tutorials that do nothing but make your head hurt. My goal is to strip away as much complexity as possible and provide you with just enough information to help you manage resources on a systemd machine.

Specific topics include:

  • Understanding the history of cgroups
  • Understanding the purpose of cgroups
  • Understanding the structure of cgroups Version 1
  • Understanding the cgroup Version 1 filesystem

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