Provisioning a complete CoreOS infrastructure on Digital Ocean with Terraform

In this recipe, we'll build from scratch a fully working CoreOS cluster on Digital Ocean in their New York region, using Terraform and cloud-init. We'll add some latency monitoring as well with StatusCake, so we have a good foundation of using Terraform on Digital Ocean.

Getting ready

To step through this recipe, you will need the following:

• A working Terraform installation

• A Digital Ocean account

• A StatusCake account

• An Internet connection

How to do it…

Let's start by creating the digitalocean provider (it only requires an API token) in a file named providers.tf:

provider "digitalocean" {
  token = "${var.do_token}"
}

Declare the do_token variable in a file named variables.tf:

variable "do_token" {
  description = "Digital Ocean Token"
}

Also, don't forget to set it in a private terraform.tfvars file:

do_token = "a1b2c3d4e5f6"

Handling the SSH key

We know that we'll need an SSH key to log into the cluster members. With Digital...