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

Understanding networkd and resolved on RHEL-type machines

We've already established that all RHEL-type machines, such as our AlmaLinux machine, use NetworkManager by default. Now, let's say that we have an AlmaLinux server and that we need the added capabilities of networkd. The systemd-networkd package isn't installed by default, and it isn't in the normal Alma repositories. However, it is in the third-party EPEL repository, so we'll install it by doing:

[donnie@localhost ~]$ sudo dnf install epel-release

Now, we can install the systemd-networkd package, which includes both networkd and resolved:

[donnie@localhost ~]$ sudo dnf install systemd-networkd

Next, disable NetworkManager and enable networkd and resolved. Note that I'm not stopping NetworkManager or starting networkd and resolved just yet (I'm logged in remotely and don't want to break my network connection. Besides, I still haven't created a networkd configuration)...