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

Rebooting with systemctl

You'll never guess what the command is to reboot a system. Okay, if you said sudo systemctl reboot, then you win today's grand prize. (Sadly, the grand prize consists of absolutely nothing, except for the good feeling that comes with giving a correct answer.)

Again, I'll leave it to you to look at the associated reboot.target files, because this also works pretty much the same as poweroff.target. One difference to note is that this time, the Alias=ctrl-alt-del.target line in the [Install] section actually does something for us. On a text mode machine, doing a Ctrl + Alt + Del sequence at the local terminal will reboot the machine. So yes, that old three-finger salute is still with us. (You don't even need to enter an admin password to make this work. So, fortunately, doing Ctrl + Alt + Del from a remote terminal doesn't work.) If you want to try this on your VirtualBox virtual machine, you'll need to click on the virtual machine...