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

Summary

In this chapter, we have learned about VDO and Stratis. We’ve looked at simple ways to manage storage, how to save disk space transparently, and how to gain some throughput in the process.

With Stratis, we have created a pool with two disks and assigned it to a mount point. It takes fewer steps than doing so with LVM, but on the other hand, we have less control over what we are doing. In any case, we learned how to use this preview technology in RHEL 9.

With VDO, we used the volume we created to define an LVM PV and, on top of it, a volume group and a logical volume that we’ve formatted using the knowledge gained in previous chapters to store a VM disk image several times, to simulate a scenario where several VMs are started from the same base.

We also learned how to check the VDO optimizations and the amount of disk saved.

Now, we’re ready to use Stratis instead of LVM to group and distribute storage (though not for production). We can also...