Book Image

Getting Started with Terraform

By : Kirill Shirinkin
Book Image

Getting Started with Terraform

By: Kirill Shirinkin

Overview of this book

Terraform is a tool used to efficiently build, configure, and improve production infrastructure. It can manage existing infrastructure as well as create custom in-house solutions. This book shows you when and how to implement infrastructure as a code practices with Terraform. It covers everything necessary to set up complete management of infrastructure with Terraform, starting with the basics of using providers and resources. This book is a comprehensive guide that begins with very small infrastructure templates and takes you all the way to managing complex systems, all using concrete examples that evolve over the course of the book. It finishes with the complete workflow of managing a production infrastructure as code – this is achieved with the help of version control and continuous integration. At the end of this book, you will be familiar with advanced techniques such as multi-provider support and multiple remote modules.
Table of Contents (15 chapters)
Getting Started with Terraform
About the Author
About the Reviewer
Customer Feedback

Performing blue-green deployments

The idea behind blue-green deployment is that instead of updating existing instances of an application, you create complete brand new production environment side by side with the existing one. Then, if it looks good, you switch the traffic to this new environment. If nothing breaks, you delete the old one. The new environment is called green, while the existing one is blue. As you might have guessed, the idea goes hand in hand with Immutable Infrastructure concept and extends it beyond single server to complete clusters of machines.

There are two ways to achieve this with Terraform:

  • The manual approach

  • The Auto-scaling groups approach

We will go with the first one. Doing things manually is not the best way to do things, but if you are in a non-AWS environment, you might not have a better choice. Elastic Load Balancer in our application module will play the role of the router in the preceding. We need to do these steps:

  1. Create a new group of instances.

  2. Switch traffic...