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

Setting the hostname and machine information

Setting a proper hostname on a computer is very useful in the business world. It allows the computer to be registered in a Domain Name Service (DNS) zone, which allows users and administrators to reach the computer via its hostname. After all, it's a lot easier to remember a computer's hostname than to remember its IP address, especially if it's an IPv6 address. (Has anyone in history ever memorized an IPv6 address?) Before we look at how to set this information, let's learn how to view it. (Note that this hostname can be automatically registered either by using Dynamic Domain Name Service (DDNS) or by using orchestration tools such as Puppet, Chef, or Ansible.)

Viewing the information

A computer's hostname is set in the /etc/hostname file, as we see here on my Alma machine:

[donnie@localhost ~]$ cd /etc
[donnie@localhost etc]$ cat hostname 
localhost.localdomain
[donnie@localhost etc]$

The installers...