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)
Section 1: Using systemd
Section 2: Understanding cgroups
Section 3: Logging, Timekeeping, Networking, and Booting

Creating a new service

To create a brand new service from scratch, use the --force and --full options together, like this:

donnie@ubuntu20-04:~$ sudo systemctl edit --force --full timestamp.service

This will create a new service file in the /etc/systemd/system/ directory, just as we saw previously.

For this demo, we'll create a service that will place a periodic timestamp into our system log file. Our timestamp.service file will look like this:

Description=Service Creation Demo

Here, we see the RestartSec= parameter, which we haven't seen before. This works with the Restart= line and just says to wait for the designated number of seconds before restarting a crashed service. Here, we're saying to wait for 20 seconds. We don't see a Type= line here...