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Oracle Linux Cookbook

You're reading from Oracle Linux Cookbook

Product type Book

Published in Jan 2024

Publisher Packt

ISBN-13 9781803249285

Pages 548 pages

Edition 1st Edition

Languages

Concepts

Operating Systems

Authors (3):

Erik Benner

Erik B. Thomsen

Jonathan Spindel

View More author details

Table of Contents (16) Chapters

Preface

1. Chapter 1: Oracle Linux 8 – Get It? Got It? Good!

2. Chapter 2: Installing with and without Automation Magic

3. Chapter 3: Exploring the Various Boot Options and Kernels in Oracle Linux

4. Chapter 4: Creating and Managing Single-Instance Filesystems

5. Chapter 5: Software Management with DNF

6. Chapter 6: Eliminating All the SPOFs! An Exercise in Redundancy

7. Chapter 7: Oracle Linux 8 – Patching Doesn’t Have to Mean Rebooting

8. Chapter 8: DevOps Automation Tools – Terraform, Ansible, Packer, and More

9. Chapter 9: Keeping the Data Safe – Securing a System

10. Chapter 10: Revisiting Modules and AppStreams

11. Chapter 11: Lions, Tigers, and Containers – Oh My! Podman and Friends

12. Chapter 12: Navigating Ansible Waters

13. Chapter 13: Let’s All Go to the Cloud

14. Index

Why subscribe?

15. Other Books You May Enjoy

Using the DNF time machine

DNF has a time machine built into it! This isn’t just a way to look back through the cosmos; it actually allows you to see the history of what was installed and also allows you to roll back a single change, or all changes up to a point.

Getting ready

To do this, you will need a test system, running Oracle Linux 8, with access to an RPM repo.

How to do it…

When DNF installs software, it keeps a history of all the actions performed. This includes upgrades to the software, installed software, and removal of the software. The dnf history command shows this history:

Figure 5.3 – The dnf history command

Figure 5.3 – The dnf history command

There are five columns – ID, Command line, Date and time, Action(s), and Altered:

ID: This is the identifier for the history, and is used in commands that will show info, roll back, undo, or store a transaction
Command line: This is the option passed to DNF when the command was run...

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Authors (3)

Erik Benner

Erik Benner is the VP of Enterprise Transformation and an Oracle ACE director. He is an expert strategist for customers across the United States. His customer engagements range from enterprise cloud transformations to data center consolidation and modernization. He frequently presents at conferences such as Oracle CloudWorld, ASCEND, BLUEPRINT 4D, and FOSSY. Having worked with Oracle and Sun Systems since the mid-90s, Erik is well-versed in most of the core Oracle technologies, including Oracle Cloud, Oracle Linux, and Oracle Database. When not flying to far points of the country from the Metro Atlanta area, he enjoys spending time with his family at their observatory, where the telescopes outnumber the people.

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Erik B. Thomsen

Erik B. Thomsen is a Principal Sales Consultant passionate about Linux, cloud-native technologies, and “Everything as Code.” He is an innovative strategist with extensive experience working in multiple facets of IT, including DevSecOps, product management for databases and Linux, and platform engineering, where he led the development of an enterprise Kubernetes container platform. He has many years of consulting experience working for numerous Fortune 500 companies. Often described as a “visionary” or “thought leader” by his peers, Erik leverages his expertise in technology with his creative development and automation skills to help customers design, deploy, and manage cutting-edge IT solutions.

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Jonathan Spindel

Jonathan Spindel is a highly skilled and experienced technology leader and evangelist with a strong emphasis on Oracle ecosystems cloud infrastructure and automation. With over 23 years in the industry, he possesses a comprehensive understanding of managing, designing, and deploying multi-tenant enterprise systems and cloud solutions to address business needs and enhance operational processes. Jonathan excels in providing end-to-end management and technical turnkey cloud solutions that drive increased business productivity and reduce operational costs, ultimately delivering timely returns on investment. His hands-on approach and deep expertise in Oracle and mainstream infrastructure and cloud technologies enable him to optimize performance and streamline operations, while his proficiency in automation ensures efficient and error-free processes.

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