Ansible: Automating Configuration Management and Deployment the Easy Way

✍ Scribed by Hochstein, Lorin;Moser, Rene

• Publisher: O'Reilly Media
• Year: 2017
• Tongue: English
• Edition: 2nd edition
• Category: Library

✦ Synopsis

Copyright; Table of Contents; Foreword; Preface to the Second Edition; A Note About Language; Acknowledgments; From Lorin; From René; Preface to the First Edition; Why I Wrote This Book; Who Should Read This Book; Navigating This Book; Conventions Used in This Book; Online Resources; Safari® Books Online; How to Contact Us; Chapter 1. Introduction; A Note About Versions; Ansible: What Is It Good For?; How Ansible Works; What's So Great About Ansible?; Easy-to-Read Syntax; Nothing to Install on the Remote Hosts; Push Based; Ansible Scales Down; Built-in Modules; Very Thin Layer of Abstraction.

✦ Table of Contents

Copyright
Table of Contents
Foreword
Preface to the Second Edition
A Note About Language
Acknowledgments
From Lorin
From René
Preface to the First Edition
Why I Wrote This Book
Who Should Read This Book
Navigating This Book
Conventions Used in This Book
Online Resources
Safari® Books Online
How to Contact Us
Chapter 1. Introduction
A Note About Versions
Ansible: What Is It Good For?
How Ansible Works
What's So Great About Ansible?
Easy-to-Read Syntax
Nothing to Install on the Remote Hosts
Push Based
Ansible Scales Down
Built-in Modules
Very Thin Layer of Abstraction. Is Ansible Too Simple?What Do I Need to Know?
What Isn't Covered
Installing Ansible
Setting Up a Server for Testing
Using Vagrant to Set Up a Test Server
Telling Ansible About Your Test Server
Simplifying with the ansible.cfg File
Moving Forward
Chapter 2. Playbooks: A Beginning
Some Preliminaries
A Very Simple Playbook
Specifying an Nginx Config File
Creating a Custom Home Page
Creating a Webservers Group
Running the Playbook
Playbooks Are YAML
Start of File
Comments
Strings
Booleans
Lists
Dictionaries
Line Folding
Anatomy of a Playbook
Plays
Tasks
Modules. Putting It All TogetherDid Anything Change? Tracking Host State
Getting Fancier: TLS Support
Generating a TLS Certificate
Variables
Generating the Nginx Configuration Template
Handlers
Running the Playbook
Chapter 3. Inventory: Describing Your Servers
The Inventory File
Preliminaries: Multiple Vagrant Machines
Behavioral Inventory Parameters
ansible_connection
ansible_shell_type
ansible_python_interpreter
ansible_*_interpreter
Changing Behavioral Parameter Defaults
Groups and Groups and Groups
Example: Deploying a Django App
Aliases and Ports
Groups of Groups. Numbered Hosts (Pets versus Cattle)Hosts and Group Variables: Inside the Inventory
Host and Group Variables: In Their Own Files
Dynamic Inventory
The Interface for a Dynamic Inventory Script
Writing a Dynamic Inventory Script
Preexisting Inventory Scripts
Breaking the Inventory into Multiple Files
Adding Entries at Runtime with add_host and group_by
add_host
group_by
Chapter 4. Variables and Facts
Defining Variables in Playbooks
Viewing the Values of Variables
Registering Variables
Facts
Viewing All Facts Associated with a Server
Viewing a Subset of Facts. Any Module Can Return FactsLocal Facts
Using set_fact to Define a New Variable
Built-in Variables
hostvars
inventory_hostname
Groups
Setting Variables on the Command Line
Precedence
Chapter 5. Introducing Mezzanine: Our Test Application
Why Deploying to Production Is Complicated
PostgreSQL: The Database
Gunicorn: The Application Server
Nginx: The Web Server
Supervisor: The Process Manager
Chapter 6. Deploying Mezzanine with Ansible
Listing Tasks in a Playbook
Organization of Deployed Files
Variables and Secret Variables.

✦ Subjects

COMPUTERS--Computer Literacy;COMPUTERS--Computer Science;COMPUTERS--Data Processing;COMPUTERS--Hardware--General;COMPUTERS--Information Technology;COMPUTERS--Machine Theory;COMPUTERS--Reference;Configuration management;Programming languages (Electronic computers);Electronic books;COMPUTERS -- Computer Literacy;COMPUTERS -- Computer Science;COMPUTERS -- Data Processing;COMPUTERS -- Hardware -- General;COMPUTERS -- Information Technology;COMPUTERS -- Machine Theory;COMPUTERS -- Reference