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Red Hat Enterprise Linux Server Cookbook

You're reading from   Red Hat Enterprise Linux Server Cookbook Over 60 recipes to help you build, configure, and orchestrate RHEL 7 Server to make your everyday administration experience seamless

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Product type Paperback
Published in Dec 2015
Publisher
ISBN-13 9781784392017
Length 250 pages
Edition 1st Edition
Tools
Concepts
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Authors (2):
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Jakub Gaj Jakub Gaj
Author Profile Icon Jakub Gaj
Jakub Gaj
William Leemans William Leemans
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William Leemans
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Toc

Table of Contents (12) Chapters Close

Preface 1. Working with KVM Guests FREE CHAPTER 2. Deploying RHEL "En Masse" 3. Configuring Your Network 4. Configuring Your New System 5. Using SELinux 6. Orchestrating with Ansible 7. Puppet Configuration Management 8. Yum and Repositories 9. Securing RHEL 7 10. Monitoring and Performance Tuning Index

Introduction

Ansible is an easy-to-use agentless system configuration management tool. It allows us to deploy complex configurations without the hassle of a complex interface or language.

Ansible uses playbooks, which are collections of tasks to deploy configurations and applications to multiple nodes over SSH in a controlled way. However, it doesn't stop there.

Ansible's modules, which are used to execute tasks, are all built to be idempotent in their execution.

The definition of Idempotence, according to Wikipedia, is as follows:

Idempotence (/ˌaɪdɨmˈpoʊtəns/ eye-dəm-poh-təns [citation needed]) is the property of certain operations in mathematics and computer science that can be applied multiple times without changing the result beyond the initial application.

In short, any module will detect the changes to be applied and perform them. If it doesn't need to change anything, it will not reapply the requested changes or interfere...

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