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

Summary

The LVM is an incredibly useful part of RHEL and provides the capabilities to manage, reallocate, distribute, and assign disk space without having to stop anything in the system. Battle-tested over the years, it is a key component for system administrators, as well as facilitating the incorporation of other extended capabilities in our systems (a flexible way to provide storage to be shared via iSCSI, also know as Internet SCSI).

Practicing LVM on test machines is extremely important so that we can be sure that the command we will run on a production system will not mean the service being stopped or data being lost.

In this chapter, we have seen the most basic, yet important, tasks that can be done with LVM. We have learned how the different layers of LVM work: PVs, VGs, and LVs. We’ve also seen how they interact with each other and how they can be managed. We have practiced creating, extending, and removing LVs, VGs, and PVs. It will be important to practice them...