demo/digitalocean: add Atlas for Terraform

demo/digitalocean/terraform/main.tf

@@ -1,11 +1,15 @@
-variable "image" {}
 variable "ssh_keys" {}
 
+resource "atlas_artifact" "nomad-digitalocean" {
+  name    = "hashicorp/nomad-demo"
+  type    = "digitalocean.image"
+  version = "latest"
+}
+
 module "servers" {
   source   = "./server"
   region   = "nyc3"
-  count    = 3
-  image    = "${var.image}"
+  image    = "${atlas_artifact.nomad-digitalocean.id}"
   ssh_keys = "${var.ssh_keys}"
 }
 
@@ -13,7 +17,7 @@ module "clients-nyc3" {
   source   = "./client"
   region   = "nyc3"
   count    = 1
-  image    = "${var.image}"
+  image    = "${atlas_artifact.nomad-digitalocean.id}"
   servers  = "${module.servers.addrs}"
   ssh_keys = "${var.ssh_keys}"
 }
@@ -23,7 +27,7 @@ module "clients-ams2" {
   source   = "./client"
   region   = "ams2"
   count    = 1
-  image    = "${var.image}"
+  image    = "${atlas_artifact.nomad-digitalocean.id}"
   servers  = "${module.servers.addrs}"
   ssh_keys = "${var.ssh_keys}"
 }
@@ -32,7 +36,7 @@ module "clients-ams3" {
   source   = "./client"
   region   = "ams3"
   count    = 1
-  image    = "${var.image}"
+  image    = "${atlas_artifact.nomad-digitalocean.id}"
   servers  = "${module.servers.addrs}"
   ssh_keys = "${var.ssh_keys}"
 }
@@ -41,7 +45,7 @@ module "clients-sfo1" {
   source   = "./client"
   region   = "sfo1"
   count    = 1
-  image    = "${var.image}"
+  image    = "${atlas_artifact.nomad-digitalocean.id}"
   servers  = "${module.servers.addrs}"
   ssh_keys = "${var.ssh_keys}"
 }

demo/digitalocean/terraform/server/main.tf

@@ -1,4 +1,3 @@
-variable "count" {}
 variable "image" {}
 variable "region" {}
 variable "size" { default = "512mb" }
@@ -7,7 +6,7 @@ variable "ssh_keys" {}
 resource "digitalocean_droplet" "server" {
   image    = "${var.image}"
   name     = "server-${var.region}-${count.index}"
-  count    = "${var.count}"
+  count    = 3
   size     = "${var.size}"
   region   = "${var.region}"
   ssh_keys = ["${split(",", var.ssh_keys)}"]

demo/digitalocean/terraform/terraform.tfvars

@@ -1,2 +1,4 @@
-image    = "13674033"
-ssh_keys = "1494275"
+# This is a comma-separated list of SSH key ID's or fingerprints
+# available in your DigitalOcean account. These keys will be granted
+# SSH access to all of the deployed instances.
+ssh_keys = "ef:7f:3d:c1:76:12:35:e8:ea:d4:17:3d:83:46:59:7c"