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

Creating timers

Creating your own timer is a two-stage process. You'll first create the service that you want to run, and then you'll create and enable the timer.

Creating a system-level timer

Let's say that you're a security-conscious soul who suspects that someone might try to plant some rootkits on your machines. You want to set up Rootkit Hunter so that it will run every day after work hours.

Note

I wanted to do this with both Ubuntu and Alma Linux. Unfortunately, there's a bug in the Rootkit Hunter package for Ubuntu that prevents Rootkit Hunter from updating its signature database. That's not too surprising, because Ubuntu quality control has always been somewhat less than perfect. So, for this example, we'll just go with Alma.

Because there's a bug in the Rootkit Hunter package in Ubuntu, we'll just do this on the Alma machine. Rootkit Hunter isn't in the normal Alma repositories, so you'll first need to...