Mastering Ansible · 2nd Edition by Keating, Jesse -- Read -- Imperial Library of Trantor

Index

Title Page Copyright

Mastering Ansible

Second Edition

Credits About the Author About the Reviewer www.PacktPub.com Customer Feedback Preface

What this book covers What you need for this book Who this book is for Conventions Reader feedback Customer support

Downloading the example code Downloading the color images of this book Errata Piracy Questions

System Architecture and Design of Ansible

Ansible version and configuration Inventory parsing and data sources

Static inventory Inventory variable data Dynamic inventories Runtime inventory additions Inventory limiting

Playbook parsing

Order of operations Relative path assumptions Play behavior directives Execution strategies Host selection for plays and tasks Play and task names

Module transport and execution

Module reference Module arguments Module transport and execution

Task performance

Variable types and location

Variable types

Accessing external data Variable precedence

Precedence order Merging hashes

Summary

Protecting Your Secrets with Ansible

Encrypting data at rest

Things Vault can encrypt Creating new encrypted files

Password prompt Password file Password script

Encrypting existing files Editing encrypted files Password rotation on encrypted files Decrypting encrypted files Executing Ansible-playbook with encrypted files

Protecting secrets while operating

Secrets transmitted to remote hosts Secrets logged to remote or local files

Summary

Unlocking the Power of Jinja2 Templates

Control structures

Conditionals

Inline conditionals

Loops

Filtering loop items Loop indexing

Macros

Macro variables

name arguments defaults catch_kwargs catch_varargs caller

Data manipulation

Syntax Useful built-in filters

default count random round

Useful Ansible provided custom filters

Filters related to task status shuffle Filters dealing with path names

basename dirname expanduser

Base64 encoding Searching for content

Omitting undefined arguments Python object methods

String methods List methods int and float methods

Comparing values

Comparisons Logic Tests

Summary

Controlling Task Conditions

Defining a failure

Ignoring errors Defining an error condition

Defining a change

Special handling of the command family Suppressing a change

Error recovery

Rescue Always

Summary

Composing Reusable Ansible Content with Roles

Task, handler, variable, and playbook include concepts

Including tasks

Passing variable values to included tasks Passing complex data to included tasks Conditional task includes Tagging included tasks

Task includes with loops Including handlers Including variables

vars_files Dynamic vars_files inclusion include_vars extra-vars

Including playbooks

Roles

Role structure

Tasks Handlers Variables Modules and plugins Dependencies Files and templates Putting it all together

Role dependencies

Role dependency variables Tags Role dependency conditionals

Role application

Mixing roles and tasks Role includes

Role sharing

Ansible Galaxy

Summary

Minimizing Downtime with Rolling Deployments

In-place upgrades Expanding and contracting Failing fast

The any_errors_fatal option The max_fail_percentage option Forcing handlers

Minimizing disruptions

Delaying a disruption Running destructive tasks only once

Serializing single tasks Summary

Troubleshooting Ansible

Playbook logging and verbosity

Verbosity Logging

Variable introspection

Variable sub elements

Subelement versus Python object method

Debugging code execution

Playbook debugging Debugging local code

Debugging inventory code Debugging playbook code Debugging executor code Debugging remote code Debugging the action plugins

Summary

Extending Ansible

Developing modules

The basic module construct Custom modules Simple module

Module documentation Providing fact data The check mode

Supporting the check mode Handling check mode

Developing plugins

Connection type plugins Shell plugins Lookup plugins Vars plugins The fact caching plugins Filter plugins Callback plugins Action plugins Distributing plugins

Developing dynamic inventory plugins

Listing hosts Listing host variables Simple inventory plugin

Optimizing script performance

Contributing to the Ansible project

Contribution submissions

The ansible repository Executing tests

Unit tests Integration tests Code style tests

Making a pull request

Summary

Infrastructure Provisioning

Managing cloud infrastructure

Creating servers

Booting virtual servers Adding to runtime inventory

Using OpenStack inventory source

Interacting with Docker containers

Building images Building containers without a Dockerfile Docker inventory

Previewing of Ansible container

Init Build Run

Summary

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