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

Starting, stopping, and reloading services

We've already seen that when you install a service on a RHEL-type distro, such as Alma Linux, the service is normally disabled and not active by default. So now, I'll give you three guesses about what the command is to start a service.

Give up? Okay, here's how we start Apache:

[donnie@localhost ~]$ sudo systemctl start httpd
[sudo] password for donnie: 
[donnie@localhost ~]$

Well, that's easy enough. Let's take a look at the status. Here's the first part of the command output:

[donnie@localhost ~]$ sudo systemctl status httpd
 httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
   Active: active (running) since Tue 2021-03-30 18:35:05 EDT; 1min 8s ago
     Docs: man:httpd.service(8)
 Main PID: 8654 (httpd)
   Status: "Running, listening on: port...