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Red Hat Enterprise Linux 8 Administration

Red Hat Enterprise Linux 8 Administration

By : Miguel Pérez Colino, Pablo Iranzo Gómez, Scott McCarty
4.5 (4)
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Red Hat Enterprise Linux 8 Administration

Red Hat Enterprise Linux 8 Administration

4.5 (4)
By: Miguel Pérez Colino, Pablo Iranzo Gómez, Scott McCarty

Overview of this book

Whether in infrastructure or development, as a DevOps or site reliability engineer, Linux skills are now more relevant than ever for any IT job, forming the foundation of understanding the most basic layer of your architecture. With Red Hat Enterprise Linux (RHEL) becoming the most popular choice for enterprises worldwide, achieving the Red Hat Certified System Administrator (RHCSA) certification will validate your Linux skills to install, configure, and troubleshoot applications and services on RHEL systems. Complete with easy-to-follow tutorial-style content, self-assessment questions, tips, best practices, and practical exercises with detailed solutions, this book covers essential RHEL commands, user and group management, software management, networking fundamentals, and much more. You'll start by learning how to create an RHEL 8 virtual machine and get to grips with essential Linux commands. You'll then understand how to manage users and groups on an RHEL 8 system, install software packages, and configure your network interfaces and firewall. As you advance, the book will help you explore disk partitioning, LVM configuration, Stratis volumes, disk compression with VDO, and container management with Podman, Buildah, and Skopeo. By the end of this book, you'll have covered everything included in the RHCSA EX200 certification and be able to use this book as a handy, on-the-job desktop reference guide. This book and its contents are solely the work of Miguel Pérez Colino, Pablo Iranzo Gómez, and Scott McCarty. The content does not reflect the views of their employer (Red Hat Inc.). This work has no connection to Red Hat, Inc. and is not endorsed or supported by Red Hat, Inc.
Table of Contents (25 chapters)
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1
Section 1: Systems Administration – Software, User, Network, and Services Management
9
Section 2: Security with SSH, SELinux, a Firewall, and System Permissions
14
Section 3: Resource Administration – Storage, Boot Process, Tuning, and Containers
21
Section 4: Practical Exercises

Working with GRUB, the bootloader, and initrd system images

Once the pre-boot execution is completed, the system will be running the GRUB bootloader.

GRUB has the mission to load the main file of an operating system, the kernel, pass parameters and options to it, and load the initial RAM disk, also known as initrd.

GRUB can be installed by using the grub2-install command. We will need to know which disk device will be used to boot, in this case, /dev/vda:

[root@rhel8 ~]# grub2-install /dev/vda
Installing for i386-pc platform.
Installation finished. No error reported.

Important note

You should point grub-install to the disk you will use to boot the system, the same one that you configured in the BIOS/UEFI to boot from.

This is intended to be used to manually rebuild a system or to fix a broken boot.

GRUB files are stored in /boot/grub2. The main configuration file is /boot/grub2/grub.cfg; however, if you take a close look at this file you will see the following...

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