Book Image

Getting Started with Terraform - Second Edition

By : Kirill Shirinkin
1 (1)
Book Image

Getting Started with Terraform - Second Edition

1 (1)
By: Kirill Shirinkin

Overview of this book

Terraform is a tool used to efficiently build, configure, and improve the production infrastructure. It can manage the 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 the complete management of infrastructure with Terraform, starting with the basics of using providers and resources. It 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. The book ends with the complete workflow of managing a production infrastructure as code—this is achieved with the help of version control and continuous integration. The readers will also learn how to combine multiple providers in a single template and manage different code bases with many complex modules. It focuses on how to set up continuous integration for the infrastructure code. The readers will be able to use Terraform to build, change, and combine infrastructure safely and efficiently.
Table of Contents (15 chapters)
Title Page
About the Author
About the Reviewer
Customer Feedback

Refreshing infrastructure

It could be that someone updated the resource managed by Terraform manually, via AWS API or the AWS Management Console. If the changed attribute is specified inside the template, then you can fix it by running the terraform apply command--given that Terraform templates are the source of truth when it comes to the state of the infrastructure. But if this attribute is not managed by a Terraform template, then you might still want it to be reflected in your state file. That's when the terraform refresh command comes to the rescue.

Apply the template and then go to the AWS Console. Open the VPC section and find the VPC Terraform created. Right-click on this VPC and choose Edit DNS Hostnames. Then, change DNS Hostnames to Yes:

Now, head back to your console and execute the terraform refresh command. Open the terraform.tfstate file and verify that the change in the state file happened as expected:

 "aws_vpc.my_vpc": { 
                    "type": "aws_vpc",