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

Deploying RHEL on the cloud

Deploying RHEL on the cloud has some differences from the previous deployments we’ve done. Let’s look at what these differences are here:

  • We won’t use an ISO image or Anaconda to perform a deployment, but a preconfigured image, usually prepared and made available by the cloud provider. The image can be later customized and adapted to our needs.
  • We will not be able to choose the configuration details of our system (such as selecting a time zone, for example) during installation time, but will be able to after.
  • An automated mechanism will be in place to change settings, such as adding a user and their credentials to access the system or configure the network:
    • The most extended and well-known mechanism used by cloud providers to do so is cloud-init.
    • Some of the images that are delivered by the cloud provider include the cloud-init software.
    • Systems are usually accessed remotely using the Secure Shell (SSH) protocol and SSH...