Book Image

Red Hat Enterprise Linux 9 Administration - Second Edition

By : Pablo Iranzo Gómez, Pedro Ibáñez Requena, Miguel Pérez Colino, Scott McCarty
2 (2)
Book Image

Red Hat Enterprise Linux 9 Administration - Second Edition

2 (2)
By: Pablo Iranzo Gómez, Pedro Ibáñez Requena, Miguel Pérez Colino, Scott McCarty

Overview of this book

With Red Hat Enterprise Linux 9 becoming the standard for enterprise Linux used from data centers to the cloud, Linux administration skills are in high demand. With this book, you’ll learn how to deploy, access, tweak, and improve enterprise services on any system on any cloud running Red Hat Enterprise Linux 9. Throughout the book, you’ll get to grips with essential tasks such as configuring and maintaining systems, including software installation, updates, and core services. You’ll also understand how to configure the local storage using partitions and logical volumes, as well as assign and deduplicate storage. You’ll learn how to deploy systems while also making them secure and reliable. This book provides a base for users who plan to become full-time Linux system administrators by presenting key command-line concepts and enterprise-level tools, along with essential tools for handling files, directories, command-line environments, and documentation for creating simple shell scripts or running commands. With the help of command line examples and practical tips, you’ll learn by doing and save yourself a lot of time. By the end of the book, you’ll have gained the confidence to manage the filesystem, users, storage, network connectivity, security, and software in RHEL 9 systems on any footprint.
Table of Contents (26 chapters)
1
Part 1 – Systems Administration – Software, User, Network, and Services Management
9
Part 2 – Security with SSH, SELinux, a Firewall, and System Permissions
14
Part 3 – Resource Administration – Storage, Boot Process, Tuning, and Containers
21
Part 4 – Practical Exercises

Creating a custom tuned profile

Once we’ve commented on the different tuned profiles, we can ask the following questions: How do they work? How do we create one?

For example, let’s examine latency-performance in the next lines of code, by checking the /usr/lib/tuned/latency-performance/tuned.conf file.

In general, the syntax of the file is described in the man tuned.conf page, but the file, as you will be able to examine, is an initialization (ini) file—that is, a file organized in categories, expressed between brackets and pairs of keys and values assigned by the equals (=) sign.

The main section defines a summary of the profile if it inherits from another profile via include, and the additional sections depend on the plugins installed.

To learn about the available plugins, the documentation included on the man page (man tuned.conf) instructs us to execute rpm -ql tuned | grep 'plugins/plugin_.*.py$', which provides an output similar to this...