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

Partitioning disks (MBR and GPT disks)

As mentioned earlier, using disk partitions allows us to more efficiently use the space available on our computers and servers.

Let’s dig into disk partitioning by first identifying the disks to act on.

Important Note

Once we have learned what caused disks to be partitioned and the limitations of this, we should follow one schema or another based on our system specifications. However, bear in mind that EFI requires GPT and BIOS requires MBR, so a system supporting UEFI, but having a disk partitioned with MBR, will boot the system into BIOS-compatible mode. Unified EFI (UEFI) is the industry standard that was known previously as EFI.

Linux uses a different notation for the disks based on the way those are connected to the system, so—for example—you can see disks as hda, sda, or mmbclk0 depending on that connection being used. Traditionally, disks connected using the Integrated Drive Electronics (IDE) interface used...