Most Terraform use cases involve relatively static infrastructure. In this recipe I will explore a more dynamic use case. Here we will leverage Terraform to run a continuous code integration into Amazon Web Services (AWS). Below I will provide a visual of what is achieved, followed up with a description of each step in what I call the "Infrastructure Time Line".

  1. We start off with a code release that is already running in an ASG from a previous deployment. This is referenced as Amazon Machine Image-x (AMI-x).

  2. Provision your new code in a new AMI via PackerIO (I will cover this specific step in a future post, stay tuned). The resulting AMI is referred to as AMI-y. We then pass AMI-y as a variable to Terraform. Terraform is then leveraged to deploy a new Autoscaling Group (ASG) to run along side the current running ASG (Using AMI-y).

  3. Terraform waits for