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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

Configuring sudo access for administrative tasks

There is a way to delegate administrative access to users in RHEL, and it is done so with a tool called sudo, which stands for Super User Do.

It not only allows you to grant full administrative privileges to users or groups but also be very granular on the privileged commands that some users may be able to execute.

Let's start by understanding the default configuration and how to change it.

Understanding sudo configuration

The tool has its main configuration file in /etc/sudoers and includes this part in the default configuration:

root ALL=(ALL)  ALL
%wheel    ALL=(ALL)  ALL 
## Read drop-in files from /etc/sudoers.d (the # here does not mean a comment)
#includedir /etc/sudoers.d

Let's analyze the lines one by one to understand what they do.

The first line enables the root user to use sudo for any command that they want to run:

root ALL=(ALL)  ALL
...

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