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

Converting RHEL 8-type distros to cgroup version 2

It's an easy matter to convert a Red Hat Enterprise Linux 8-type distro to cgroup Version 2. Step 1 is to edit the /etc/default/grub file on your AlmaLinux machine. Find the line that starts with GRUB_CMDLINE_LINUX=. At the end of that line, add systemd.unified_cgroup_hierarchy=1. The whole line should now look like this:

GRUB_CMDLINE_LINUX="crashkernel=auto resume=/dev/mapper/vl-swap rd.lvm.lv=vl/root rd.lvm.lv=vl/swap rhgb quiet systemd.unified_cgroup_hierarchy=1"

Next, rebuild the GRUB configuration, like this:

[donnie@localhost ~]$ sudo grub2-mkconfig -o /boot/grub2/grub.cfg

Reboot the machine, and then look in the /sys/fs/cgroup/ directory. You should now see the same filesystem that you see on the Fedora machine. However, don't be too disappointed if you can't get all of the previous labs to work. It's just that the RHEL 8-type distros all use an older version of the Linux kernel, which...