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

Load balancing and simulating conditionals

If we were not using AWS in this book or if we would want to go the more complicated (but certainly more flexible) way, we would use our very own load balancer. But we won't, because we can simply take Elastic Load Balancer (ELB) service of AWS and put application servers behind it.

This means we will add yet another resource to the application module. Add the following configuration right after the null_resource provisioners:

resource "aws_elb" "load-balancer" { 
  name = "application-load-balancer" 
  subnets = ["${var.subnets}"] 
  security_groups = ["${}"]  
  listener { 
    instance_port = 80 
    instance_protocol = "http" 
    lb_port = 80 
    lb_protocol = "http" 
  health_check { 
    healthy_threshold = 2 
    unhealthy_threshold = 2 
    timeout = 3 
    target = "TCP:80" 
    interval = 30