Learning Ansible 2.X*

Cover
Title Page
Copyright and Credits
About Packt
Contributors
Table of Contents
Preface
Section 1: Creating a Web Server Using Ansible
Chapter 1: Getting Started with Ansible
	Technical requirements
	IT automation
		Advantages of IT automation
		Disadvantages of IT automation
		Types of IT automation
			Agent-based systems
			Agent-less systems
			Agent-based versus agent-less systems
	What is Ansible?
		Secure Shell
	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 Vagrant
	Version control systems
	Using Ansible with Git
	Summary
Chapter 2: Automating Simple Tasks
	Technical Requirement
	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
Section 2: Deploying Playbooks in a Production Environment
Chapter 3: Scaling to Multiple Hosts
	Technical requirements 
	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 inventories
		Amazon Web Services
		DigitalOcean
		Working with iterates in Ansible
		Using standard iteration – with_items
		Using nested loops – with_nested
		Fileglobs loop – with_fileglobs
		Using an integer loop – with_sequence
	Summary
Chapter 4: Handling Complex Deployment
	Technical requirements
	Working with the local_action feature
	Delegating a task
	Working with conditionals
		Boolean conditionals
		Checking whether a variable is set
	Working with include
	Working with handlers
	Working with roles
	Organizing a project
	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
	The Ansible template – Jinja filters
	Formatting data using filters
	Defaulting undefined variables
	Security management
	Using Ansible Vault
	Vaults and playbooks
	Encrypting user passwords
	Hiding passwords
	Using no_log
	Summary
Chapter 5: Going Cloud
	Technical requirements
	Provisioning resources in the cloud
	Provisioning machines in AWS
		AWS global infrastructure
		AWS Simple Storage Service 
		AWS Elastic Compute Cloud 
		AWS Virtual Private Cloud 
		AWS Route 53
		AWS Elastic Block Storage
		AWS Identity and Access Management
		Amazon Relational Database Service 
		Setting up an account with AWS
		Simple AWS deployment
		Complex AWS deployment
	Provisioning machines in DigitalOcean
		Droplets
		SSH key management
		Private networking
		Adding an SSH key in DigitalOcean
		Deployment in DigitalOcean
	Provisioning machines in Azure
	Summary
Chapter 6: Getting Notification from Ansible
	Technical requirements 
	Sending emails with Ansible
	XMPP
	Slack
	Rocket Chat
	Internet Relay Chat
	Amazon Simple Notification Service
	Nagios
	Summary
Section 3: Deploying an Application with Ansible
Chapter 7: Creating a Custom Module
	Prerequisite
	Using Python to write modules
		Working with exit_json and fail_json
		Testing Python modules
	Using bash modules
	Using Ruby modules
	Testing modules
	Summary
Chapter 8: Debugging and Error Handling
	Technical requirements
	Syntax checking
	The check mode
	Indicating differences between files using --diff
	Functional testing in Ansible
		Functional testing using assert
	Testing with tags
		Understanding the --skip-tags option
		Understanding debugging commands
	Managing exceptions
	Trigger failure
	Summary
Chapter 9: Complex Environments
	Technical requirements
	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 a revision control system
	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
Section 4: Deploying an Application with Ansible
Chapter 10: Introducing Ansible for Enterprises
	Technical requirements
	Ansible on Windows
	Ansible Galaxy
		Pushing a role to Ansible Galaxy
	Ansible Tower and AWX
	Summary
Chapter 11: Getting Started with AWX
	Technical requirements
	Setting up AWX
		Installing Ansible, Docker, and Docker-py in Fedora
		Giving the current user permission to use Docker in Fedora
		Installing AWX
	Creating new AWX projects
	Using AWX inventories
	Understanding AWX job templates
	Using AWX jobs
	Summary
Chapter 12: Working with AWX Users, Permissions, and Organizations
	Technical requirements
	AWX users and permissions
	AWX organizations
	Summary
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Index