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

Understanding cpuset

When you're dealing with a server that's running lots of containers and processes, it's sometimes beneficial to assign a container or a process to a certain CPU core or set of CPU cores. On a machine with more than one physical CPU, it might also be beneficial to assign a memory node, as well. To see what I'm talking about, install numactl on your Fedora machine, like this:

[donnie@fedora ~]$ sudo dnf install numactl

Use the -H option to look at the hardware list, like this:

[donnie@fedora ~]$ numactl -H
available: 1 nodes (0)
node 0 cpus: 0 1 2 3
node 0 size: 7939 MB
node 0 free: 6613 MB
node distances:
node   0 
  0:  10 
[donnie@fedora ~]$

There's one NUMA node, which is node 0, and which is associated with four CPUs. Well, in reality, there's only one CPU that has four CPU cores. We also see the amount of memory that is assigned to this node.

So, now you're saying, But Donnie...