hack/terraform-quickstart: allow instance_type configuration

Author: Patrick Baxter

hack/terraform-quickstart/main.tf

@@ -6,13 +6,14 @@ provider "aws" {
 
 resource "aws_instance" "bootstrap_node" {
   ami                  = "${data.aws_ami.coreos_ami.image_id}"
-  instance_type        = "m3.medium"
+  instance_type        = "${var.instance_type}"
   key_name             = "${var.ssh_key}"
   iam_instance_profile = "${aws_iam_instance_profile.bk_profile.id}"
 
   tags {
     Name = "${var.instance_tags}"
   }
+
   root_block_device {
     volume_type = "gp2"
     volume_size = "30"
@@ -21,7 +22,7 @@ resource "aws_instance" "bootstrap_node" {
 
 resource "aws_instance" "worker_node" {
   ami                  = "${data.aws_ami.coreos_ami.image_id}"
-  instance_type        = "m3.medium"
+  instance_type        = "${var.instance_type}"
   key_name             = "${var.ssh_key}"
   count                = "${var.num_workers}"
   iam_instance_profile = "${aws_iam_instance_profile.bk_profile.id}"
@@ -38,7 +39,7 @@ resource "aws_instance" "worker_node" {
 
 resource "aws_instance" "master_node" {
   ami                  = "${data.aws_ami.coreos_ami.image_id}"
-  instance_type        = "m3.medium"
+  instance_type        = "${var.instance_type}"
   key_name             = "${var.ssh_key}"
   count                = "${var.additional_masters}"
   iam_instance_profile = "${aws_iam_instance_profile.bk_profile.id}"

hack/terraform-quickstart/variables.tf

@@ -16,6 +16,12 @@ variable "instance_tags" {
   type        = "string"
 }
 
+variable "instance_type" {
+  description = "Name all instances behind a single tag based on who/what is running terraform"
+  type        = "string"
+  default     = "m3.medium"
+}
+
 variable "self_host_etcd" {
   type    = "string"
   default = "true"