add terraforce deployment method

terraforce/cluster/main.tf

@@ -0,0 +1,77 @@
+/**
+ * Cluster on DO
+ *
+ */
+
+variable "name" {
+  description = "The cluster name, e.g cdn"
+}
+
+variable "environment" {
+  description = "Environment tag, e.g prod"
+}
+
+variable "image_id" {
+  description = "Image ID"
+}
+
+variable "regions" {
+  description = "Regions to launch in"
+  type = "list"
+}
+
+variable "key_ids" {
+  description = "SSH keys to use"
+  type = "list"
+}
+
+variable "instance_size" {
+  description = "The instance size to use, e.g 2gb"
+}
+
+variable "desired_capacity" {
+  description = "Desired instance count"
+  default     = 3
+}
+
+#-----------------------
+# Instances
+
+resource "digitalocean_droplet" "cluster" {
+  # set the image and instance type
+  name = "${var.name}${count.index}"
+  image = "${var.image_id}"
+  size = "${var.instance_size}"
+
+  # the `element` function handles modulo
+  region = "${element(var.regions, count.index)}"
+
+  ssh_keys = "${var.key_ids}"
+
+  count = "${var.desired_capacity}"
+  lifecycle = {
+	prevent_destroy = false
+  }
+}
+
+#-----------------------
+
+// The cluster name, e.g cdn
+output "name" {
+  value = "${var.name}"
+}
+
+// The list of cluster instance ids
+output "instances" {
+  value = ["${digitalocean_droplet.cluster.*.id}"]
+}
+
+// The list of cluster instance ips
+output "private_ips" {
+  value = ["${digitalocean_droplet.cluster.*.ipv4_address_private}"]
+}
+
+// The list of cluster instance ips
+output "public_ips" {
+  value = ["${digitalocean_droplet.cluster.*.ipv4_address}"]
+}