Ansible for DevOps
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Completed on 2018-11-18
About the Book
Ansible is a simple, but powerful, server and configuration management tool (with a few other tricks up its sleeve). This book helps those familiar with the command line and basic shell scripting start using Ansible to provision and manage anywhere from one to thousands of servers.
The book begins with fundamentals, like installing Ansible, setting up a basic inventory file, and basic concepts, then guides you through Ansible's many uses, including ad-hoc commands, basic and advanced playbooks, application deployments, multiple-provider server provisioning, and even Docker orchestration! Everything is explained with pertinent real-world examples, often using Vagrant-managed virtual machines.
Examples in the book are tested with the latest version of Ansible (2.x as of this writing).
About the Author
Bundles that include this book
Table of Contents
- Foreword
-
Preface
- Who is this book for?
- Typographic conventions
-
Please help improve this book!
- Current Published Book Version Information
- About the Author
-
Introduction
- In the beginning, there were sysadmins
- Modern infrastructure management
- Ansible and Red Hat
- Ansible Examples
- Other resources
-
Chapter 1 - Getting Started with Ansible
-
Ansible and Infrastructure Management
- On snowflakes and shell scripts
- Configuration management
- Installing Ansible
- Creating a basic inventory file
- Running your first Ad-Hoc Ansible command
- Summary
-
Ansible and Infrastructure Management
-
Chapter 2 - Local Infrastructure Development: Ansible and Vagrant
- Prototyping and testing with local virtual machines
- Your first local server: Setting up Vagrant
- Using Ansible with Vagrant
- Your first Ansible playbook
- Cleaning Up
- Summary
-
Chapter 3 - Ad-Hoc Commands
- Conducting an orchestra
- Build infrastructure with Vagrant for testing
- Inventory file for multiple servers
-
Your first ad-hoc commands
- Discover Ansible’s parallel nature
- Learning about your environment
- Make changes using Ansible modules
-
Configure groups of servers, or individual servers
- Configure the Application servers
- Configure the Database servers
- Make changes to just one server
- Manage users and groups
- Manage packages
-
Manage files and directories
- Get information about a file
- Copy a file to the servers
- Retrieve a file from the servers
- Create directories and files
- Delete directories and files
-
Run operations in the background
- Update servers asynchronously, monitoring progress
- Fire-and-forget tasks
- Check log files
- Manage cron jobs
- Deploy a version-controlled application
-
Ansible’s SSH connection history
- Paramiko
- OpenSSH (default)
- Accelerated Mode
- Faster OpenSSH in Ansible 1.5+
- Summary
-
Chapter 4 - Ansible Playbooks
- Power plays
-
Running Playbooks with
ansible-playbook- Limiting playbooks to particular hosts and groups
-
Setting user and sudo options with
ansible-playbook -
Other options for
ansible-playbook
-
Real-world playbook: CentOS Node.js app server
- Add extra repositories
- Deploy a Node.js app
- Launch a Node.js app
- Node.js app server summary
-
Real-world playbook: Ubuntu LAMP server with Drupal
-
Include a variables file, and discover
pre_tasksandhandlers - Basic LAMP server setup
- Configure Apache
-
Configure PHP with
lineinfile - Configure MySQL
- Install Composer and Drush
- Install Drupal with Git and Drush
- Drupal LAMP server summary
-
Include a variables file, and discover
-
Real-world playbook: Ubuntu server with Solr
-
Include a variables file, and more
pre_tasksandhandlers - Install Java 8
- Install Apache Solr
- Apache Solr server summary
-
Include a variables file, and more
- Summary
-
Chapter 5 - Ansible Playbooks - Beyond the Basics
- Handlers
-
Environment variables
- Per-play environment variables
-
Variables
- Playbook Variables
- Inventory variables
- Registered Variables
- Accessing Variables
-
Host and Group variables
-
Automatically-loaded
group_varsandhost_vars - Magic variables with host and group variables and information
-
Automatically-loaded
-
Facts (Variables derived from system information)
- Local Facts (Facts.d)
- Ansible Vault - Keeping secrets secret
- Variable Precedence
-
If/then/when - Conditionals
- Jinja2 Expressions, Python built-ins, and Logic
-
register -
when -
changed_whenandfailed_when -
ignore_errors
-
Delegation, Local Actions, and Pauses
-
Pausing playbook execution with
wait_for - Running an entire playbook locally
-
Pausing playbook execution with
- Prompts
- Tags
- Blocks
- Summary
-
Chapter 6 - Playbook Organization - Roles, Includes, and Imports
-
Imports
- Includes
- Dynamic includes
- Handler imports and includes
- Playbook imports
- Complete includes example
-
Roles
- Role scaffolding
- Building your first role
- More flexibility with role vars and defaults
-
Other role parts: handlers, files, and templates
- Handlers
- Files and Templates
- Organizing more complex and cross-platform roles
-
Ansible Galaxy
-
Getting roles from Galaxy
- Using role requirements files to manage dependencies
- A LAMP server in nine lines of YAML
- A Solr server in seven lines of YAML
- Helpful Galaxy commands
- Contributing to Ansible Galaxy
-
Getting roles from Galaxy
- Summary
-
Imports
-
Chapter 7 - Inventories
-
A real-world web application server inventory
- Non-prod environments, separate inventory files
-
Inventory variables
-
host_vars -
group_vars
-
-
Ephemeral infrastructure: Dynamic inventory
-
Dynamic inventory with DigitalOcean
- DigitalOcean account prerequisites
- Connecting to your DigitalOcean account
- Creating a droplet with Ansible
-
DigitalOcean dynamic inventory with
digital_ocean.py
- Dynamic inventory with AWS
-
Inventory on-the-fly:
add_hostandgroup_by - Multiple inventory sources - mixing static and dynamic inventories
-
Creating custom dynamic inventories
- Building a Custom Dynamic Inventory in Python
- Building a Custom Dynamic Inventory in PHP
- Managing a PaaS with a Custom Dynamic Inventory
-
Dynamic inventory with DigitalOcean
- Summary
-
A real-world web application server inventory
-
Chapter 8 - Ansible Cookbooks
-
Highly-Available Infrastructure with Ansible
- Directory Structure
- Individual Server Playbooks
- Main Playbook for Configuring All Servers
- Getting the required roles
- Vagrantfile for Local Infrastructure via VirtualBox
- Provisioner Configuration: DigitalOcean
- Provisioner Configuration: Amazon Web Services (EC2)
- Summary
-
ELK Logging with Ansible
- ELK Playbook
- Forwarding Logs from Other Servers
- Summary
-
GlusterFS Distributed File System Configuration with Ansible
- Configuring Gluster - Basic Overview
- Configuring Gluster with Ansible
- Summary
-
Mac Provisioning with Ansible and Homebrew
- Running Ansible playbooks locally
- Automating Homebrew package and app management
- Configuring Mac OS X through dotfiles
- Summary
-
Highly-Available Infrastructure with Ansible
-
Chapter 9 - Deployments with Ansible
- Deployment strategies
-
Simple single-server deployments
- Provisioning a Ruby on Rails server
- Deploying a Rails app to the server
- Provisioning and Deploying the Rails App
- Deploying application updates
-
Zero-downtime multi-server deployments
-
Ensuring zero downtime with
serialand integration tests - Deploying to app servers behind a load balancer
-
Ensuring zero downtime with
- Capistrano-style and blue-green deployments
- Additional Deployment Features
- Summary
-
Chapter 10 - Server Security and Ansible
-
A brief history of SSH and remote access
- Telnet
- rlogin, rsh and rcp
- SSH
- The evolution of SSH and the future of remote access
- Use secure and encrypted communication
-
Disable root login and use
sudo - Remove unused software, open only required ports
-
Use the principle of least privilege
- User account configuration
- File permissions
-
Update the OS and installed software
- Automating updates
- Automating updates for RHEL systems
- Automating updates for Debian-based systems
-
Use a properly-configured firewall
-
Configuring a firewall with
ufwon Debian or Ubuntu -
Configuring a firewall with
firewalldon RHEL, Fedora, or CentOS
-
Configuring a firewall with
- Make sure log files are populated and rotated
- Monitor logins and block suspect IP addresses
- Use SELinux (Security-Enhanced Linux) or AppArmor
- Summary and further reading
-
A brief history of SSH and remote access
-
Chapter 11 - Automating Your Automation - Ansible Tower and CI/CD
-
Ansible Tower
- Getting and Installing Ansible Tower
- Using Ansible Tower
- Other Tower Features of Note
- Tower Alternatives
-
Jenkins CI
- Build a local Jenkins server with Ansible
- Create an Ansible playbook on the Jenkins server
- Create a Jenkins job to run an Ansible Playbook
-
Unit, Integration, and Functional Testing
-
Debugging and Asserting
-
The
debugmodule -
The
failandassertmodules
-
The
- Checking syntax and performing dry runs
-
Debugging and Asserting
-
Automated testing on GitHub using Travis CI
- Testing on multiple OSes with Docker
- Setting up the test
- Building Docker containers in Travis
- Testing the role’s syntax
- Role success - first run
- Role idempotence
- Role success - final result
- Some notes about Travis CI
- Real-world examples
-
Functional testing using serverspec
- Other server and role testing tools
- Summary
-
Ansible Tower
-
Chapter 12 - Automating HTTPS and TLS Certificates
-
Generating Self-Signed Certificates with Ansible
- Idempotent Nginx HTTPS playbook with a self-signed cert
- Automating Let’s Encrypt with Ansible for free Certs
- Configuring Nginx to proxy HTTP traffic
- Summary
-
Generating Self-Signed Certificates with Ansible
-
Chapter 13 - Docker and Ansible
- A brief introduction to Docker containers
- Using Ansible to build and manage containers
-
Building a Flask app with Ansible and Docker
- Data storage container
- Flask container
- MySQL container
- Ship it!
-
Building containers with Ansible from the outside
-
Build a Hubot Slack bot container with
ansible_connection: docker- Hubot and Slack
- Building a Docker container with Ansible
-
Building the
hubot-slackrole - Building and running the Hubot Slack bot container
- Summary
-
Build a Hubot Slack bot container with
- Summary
-
Chapter 14 - Kubernetes and Ansible
-
- A bit of Kubernetes history
- Evaluating the need for Kubernetes
- Building a Kubernetes cluster with Ansible
-
Managing Kubernetes with Ansible
-
Ansible’s
k8smodule - Managing Kubernetes Applications with Helm
-
Interacting with Pods using the
kubectlconnection plugin
-
Ansible’s
- Summary
-
- Afterword
-
Appendix A - Using Ansible on Windows workstations
-
Method 1 - Use the Windows Subsystem for Linux / Bash on Ubuntu
- Installing Ansible inside Bash on Ubuntu
-
Method 2 - When WSL is not an option
- Prerequisites
- Set up an Ubuntu Linux Virtual Machine
- Log into the Virtual Machine
- Install Ansible
- Summary
-
Method 1 - Use the Windows Subsystem for Linux / Bash on Ubuntu
-
Appendix B - Ansible Best Practices and Conventions
-
Playbook Organization
-
Write comments and use
nameliberally - Include related variables and tasks
- Use Roles to bundle logical groupings of configuration
- Use role defaults and vars correctly
-
Write comments and use
-
YAML Conventions and Best Practices
- YAML for Ansible tasks
-
Three ways to format Ansible tasks
-
Shorthand/one-line (
key=value) -
Structured map/multi-line (
key:value) -
Folded scalars/multi-line (
>)
-
Shorthand/one-line (
-
Using
|to format multiline variables
-
Using
ansible-playbook - Use Ansible Tower
-
Specify
--forksfor playbooks running on > 5 servers - Use Ansible’s Configuration file
- Summary
-
Playbook Organization
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