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

Changing the default target

When you install a Linux operating system, the installer will configure either multi-user.target or graphical.target as the default, depending upon whether or not you choose to install a graphical desktop environment. When you boot up a Linux machine, it can be quite obvious what the default target is. If a graphical desktop shows up, you can rest assured that graphical.target is set as the default:

Figure 6.5 – AlmaLinux with the Gnome 3 desktop

However, if a graphical desktop doesn't show up, it doesn't necessarily mean that the machine is set up with multi-user.target as its default. It could be that graphical.target is the default, and that the graphical display manager has failed to start. (I've seen that happen a few times when a video card driver is configured incorrectly.)

To see which target is set as the default, use systemctl get-default:

[donnie@localhost system]$ systemctl get-default...