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

Verifying the status of a service

I'll be using Alma Linux for this first demo, for a reason that will become clear in just a moment. First, let's install the Apache web server by doing the following:

sudo dnf install httpd

Before you can start using Apache, you'll want to know whether it's enabled, so that it will automatically start when you reboot the machine. You'll also want to know whether it's active, which just means that it's running.

To see whether it's enabled, do the following:

[donnie@localhost ~]$ systemctl is-enabled httpd
[sudo] password for donnie: 
disabled
[donnie@localhost ~]$

Here, you see why I'm using a RHEL-type distro for this. When you install a service on any RHEL-type machine, it's normally disabled by default. When you install a service on Ubuntu, it's normally enabled by default. So, by doing this on Alma Linux, I can give you more to look at.

Next, let's see whether Apache is...