Learning Ansible 2 - Second Edition电子书

Learning Ansible 2 Second Edition

Learning Ansible 2 Second Edition

Credits

About the Author

About the Reviewer

www.PacktPub.com

Why subscribe?

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

Errata

Piracy

Questions

1. Getting Started with Ansible

IT automation

The history of IT automation

Advantages of IT automation

Disadvantages of IT automation

Limiting the possible damages of an error propagation

Types of IT automation

Agent-based systems

Agent-less systems

Agent-based versus Agent-less systems

What is Ansible?

Secure Shell (SSH)

Why Ansible?

Installing Ansible

Installing Ansible using the system's package manager

Installing via Yum

Installing via Apt

Installing via Homebrew

Installing via pip

Installing Ansible from source

Creating a test environment with QEMU and KVM

Version control system

Using Ansible with Git

Summary

2. Automating Simple Tasks

YAML

Hello Ansible

Working with playbooks

Studying the anatomy of a playbook

Running a playbook

Ansible verbosity

Variables in playbooks

Creating the Ansible user

Configuring a basic server

Enabling EPEL

Installing Python bindings for SELinux

Upgrading all installed packages

Ensuring that NTP is installed, configured, and running

Ensuring that FirewallD is present and enabled

Adding a customized MOTD

Changing the hostname

Reviewing and running the playbook

Installing and configuring a web server

Publishing a website

Jinja2 templates

Variables

Filters

Conditionals

Cycles

Summary

3. Scaling to Multiple Hosts

Working with inventory files

The basic inventory file

Groups in an inventory file

Regular expressions in the inventory file

Working with variables

Host variables

Group variables

Variable files

Overriding configuration parameters with an inventory file

Working with dynamic inventory

Amazon Web Services

DigitalOcean

Working with iterates in Ansible

Standard iteration - with_items

Nested loops - with_nested

Fileglobs loop - with_fileglobs

Integer loop - with_sequence

Summary

4. Handling Complex Deployment

Working with the local_action feature

Delegating a task

Working with conditionals

Boolean conditionals

Checking if a variable is set

Working with include

Working with handlers

Working with roles

Project organization

Anatomy of a role

Transforming your playbooks in a full Ansible project

Transforming a playbook into a role

Helper files

Transforming the webserver role

Handlers in roles

Execution strategies

Tasks blocks

The Ansible template - Jinja filters

Formatting data using filters

Using filters with conditionals

Defaulting undefined variables

Security management

Using Ansible vault

Vaults and playbooks

Encrypting user passwords

Hiding passwords

Using no_log

Summary

5. Going Cloud

Provisioning resources in the cloud

Amazon Web Service

AWS global infrastructure

AWS Simple Storage Service

AWS Elastic Compute Cloud (EC2)

AWS Virtual Private Cloud (VPC)

AWS Route 53

AWS Elastic Block Storage (EBS)

AWS Identity and Access Management

Amazon relational database service

Setting up an account with AWS

Simple AWS deployment

Complex AWS deployment

DigitalOcean

Droplets

SSH key management

Private networking

Adding an SSH key in DigitalOcean

Deployment in DigitalOcean

Summary

6. Getting Notifications from Ansible

E-mails

XMPP

Slack

Rocket Chat

Internet Relay Chat (IRC)

Amazon Simple Notification Service

Nagios

Summary

7. Creating a Custom Module

Using Python modules

Working with exit_json and fail_json

Testing Python modules

Using bash modules

Using Ruby modules

Testing modules

Summary

8. Debugging and Error Handling

The check mode

Indicating differences between files using --diff

Functional testing in Ansible

Functional testing using assert

Testing with tags

The --skip-tags

Managing exceptions

Trigger failure

Summary

9. Complex Environments

Code based on the Git branch

A single stable branch with multiple folders

Software distribution strategy

Copying files from the local machine

Revision control system with branches

Revision control system with tags

RPM packages

Preparing the environment

Deploying a web app with revision control systems

Deploying a web app with RPM packages

Creating a Spec file

Building RPMs manually

Building RPMs with Ansible

Building RPMs with CI/CD pipelines

Building compiled software with RPM packaging

Deployment strategies

Canary deployment

Blue/Green deployment

Optimizations

Pipelining

Optimizing with_items

Understanding what happens when your tasks are executed

Summary

10. Introducing Ansible for Enterprises

Ansible on Windows

Ansible for networking devices

Ansible Galaxy

Ansible Tower

Summary