website: add AWS example

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

@@ -10,16 +10,103 @@ This provides a template for running a simple two-tier architecture on Amazon
 Web services.
 
 The basic premise is you have stateless app servers running behind
-and ELB serving traffic. State for your application is stored in an RDS
+an ELB serving traffic. State for your application is stored in an RDS
 database.
 
-This ignores deploying and getting data onto the application
-servers intentionally to simplify. However, you could do so either via
-[provisioners](/docs/provisioners/index.html) or by pre-baking configured
-AMIs with [Packer](http://www.packer.io).
+To simplify the example, this intentionally ignores deploying and
+getting your application onto the servers. However, you could do so either via
+[provisioners](/docs/provisioners/index.html) and a configuration
+management tool, or by pre-baking configured AMIs with
+[Packer](http://www.packer.io).
+
+After you run `terraform apply` on this configuration, it will
+automatically output the DNS address of the ELB. After your instance
+registers, this should respond with the default nginx web page.
 
 ## Configuration
 
 ```
-FOOBAR
+# Our default security group to access
+# the instances over SSH and HTTP
+resource "aws_security_group" "default" {
+    name = "terraform_example"
+    description = "Used in the terraform"
+
+    # SSH access from anywhere
+    ingress {
+        from_port = 22
+        to_port = 22
+        protocol = "tcp"
+        cidr_blocks = ["0.0.0.0/0"]
+    }
+
+    # HTTP access from anywhere
+    ingress {
+        from_port = 80
+        to_port = 80
+        protocol = "tcp"
+        cidr_blocks = ["0.0.0.0/0"]
+    }
+}
+
+
+resource "aws_elb" "web" {
+  name = "terraform-example-elb"
+
+  # The same availability zone as our instance
+  availability_zones = ["${aws_instance.web.availability_zone}"]
+
+  listener {
+    instance_port = 80
+    instance_protocol = "http"
+    lb_port = 80
+    lb_protocol = "http"
+  }
+
+  # The instance is registered automatically
+  instances = ["${aws_instance.web.id}"]
+}
+
+
+resource "aws_instance" "web" {
+  # The connection block tells our provisioner how to
+  # communicate with the resource (instance)
+  connection {
+    # The default username for our AMI
+    user = "ubuntu"
+
+    # The path to your keyfile
+    key_file = "/Users/pearkes/Desktop/hashicorp-demo.pem"
+  }
+
+  instance_type = "m1.small"
+
+  # ubuntu-precise-12.04-amd64-server
+  ami = "ami-4fccb37f"
+
+  # The name of our SSH keypair you've created and downloaded
+  # from the AWS console.
+  #
+  # https://console.aws.amazon.com/ec2/v2/home?region=us-west-2#KeyPairs:
+  #
+  key_name = "hashicorp-demo"
+
+  # Our Security group to allow HTTP and SSH access
+  security_groups = ["${aws_security_group.default.name}"]
+
+  # We run a remote provisioner on the instance after creating it.
+  # In this case, we just install nginx and start it. By default,
+  # this should be on port 80
+  provisioner "remote-exec" {
+    inline = [
+        "sudo apt-get -y update",
+        "sudo apt-get -y install nginx",
+        "sudo service nginx start",
+    ]
+  }
+}
+
+output "address" {
+  value = "${aws_elb.web.dns_name}"
+}
 ```