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

Playing with Terraform graph

Let's play around with our VPC a bit to better understand how resource dependencies are handled. Instead of adding a subnet, let's destroy complete infrastructure we have so far and then plan creation from scratch:

$> terraform destroy
$> terraform plan
      # ... 
+ aws_subnet.public
    availability_zone:       "<computed>"
    cidr_block:              ""    map_public_ip_on_launch: "false"
    vpc_id:                  "${}"
# ...

Terraform doesn't know the VPC ID yet, so it doesn't show it to you in the plan. Let's apply the template and observe the order of resource creation:

$> terraform apply
aws_vpc.my_vpc: Creating...
  cidr_block:                "" => ""
  default_network_acl_id:    "" => "<computed>"
  default_security_group_id: "" => "<computed>"
  dhcp_options_id:           "" => "<computed>"
  enable_classiclink:        "" => "<computed>"