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

Flexible Storage Management with LVM

Managing local storage can be done more flexibly than in Chapter 12, Managing Local Storage and Filesystems, by using Logical Volume Manager (LVM). LVM allows you to assign more than one disk to the same logical volume (the equivalent in LVM to a partition), replicate data across different disks, and make snapshots of a volume.

In this chapter, we will review the basic usage of LVM and the main objects that are used to manage storage. We will learn how to prepare disks to be used with LVM and then aggregate them into a pool, thereby not only increasing the available space but also enabling you to use it consistently. We will also learn how to distribute that aggregated disk space into partition-like chunks that can easily be extended if necessary. To do so, we will go through the following topics:

  • Understanding LVM
  • Creating, moving, and removing physical volumes
  • Combining physical volumes into volume groups
  • Creating and extending...