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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

Key-based authentication with SSH

One big advantage of SSH connections is that commands can be given to be executed on remote hosts, for example, to grab updated data that can be used for monitoring without requiring a specific agent on the host.

Having to provide login details on each connection is not something that we could consider an improvement to the user experience, but SSH also allows us to create a keypair that can be used for authentication to remote systems so that no password or credential input is required.

The keys contain two parts: one that is public and must be configured in each host we want to connect to, and one that is private and must be secured as it will be used to identify us while we're trying to connect to remote hosts.

It is not necessary to say that this entire process happens over the encrypted connection created by SSH. So, using SSH and compression will also make our connections faster versus other legacy methods such as telnet, which...

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