website: add count example

website/source/intro/examples/aws.html.markdown

@@ -41,6 +41,7 @@ resource.
 variable "aws_access_key" {}
 variable "aws_secret_key" {}
 variable "key_path" {}
+variable "key_name" {}
 variable "aws_region" {
     default = "us-west-2"
 }

website/source/intro/examples/count.markdown

@@ -0,0 +1,78 @@
+---
+layout: "intro"
+page_title: "Count"
+sidebar_current: "examples-count"
+---
+
+# Count Example
+
+The count parameter on resources can simplify configurations
+and let you scale resources by simply incrementing a number.
+
+Additionally, variables can be used to expand a list of resources
+for use elsewhere.
+
+## Command
+
+```
+ terraform apply \
+    -var 'aws_access_key=YOUR_ACCESS_KEY' \
+    -var 'aws_secret_key=YOUR_SECRET_KEY'
+```
+
+## Configuration
+
+```
+variable "aws_access_key" {}
+variable "aws_secret_key" {}
+variable "aws_region" {
+    default = "us-west-2"
+}
+
+# Ubuntu Precise 12.04 LTS (x64)
+variable "aws_amis" {
+    default = {
+        "eu-west-1": "ami-b1cf19c6",
+        "us-east-1": "ami-de7ab6b6",
+        "us-west-1": "ami-3f75767a",
+        "us-west-2": "ami-21f78e11"
+    }
+}
+
+# Specify the provider and access details
+provider "aws" {
+    access_key = "${var.aws_access_key}"
+    secret_key = "${var.aws_secret_key}"
+    region = "${var.aws_region}"
+}
+
+resource "aws_elb" "web" {
+  name = "terraform-example-elb"
+
+  # The same availability zone as our instances
+  availability_zones = ["${aws_instance.web.*.availability_zone}"]
+
+  listener {
+    instance_port = 80
+    instance_protocol = "http"
+    lb_port = 80
+    lb_protocol = "http"
+  }
+
+  # The instances are registered automatically
+  instances = ["${aws_instance.web.*.id}"]
+}
+
+
+resource "aws_instance" "web" {
+  instance_type = "m1.small"
+  ami = "${lookup(var.aws_amis, var.aws_region)}"
+
+  # This will create 4 instances
+  count = 4
+}
+
+output "address" {
+  value = "Instances: ${aws_instance.web.*.id}"
+}
+```