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

112 lines
2.9 KiB
Markdown
Raw Normal View History

---
layout: "intro"
page_title: "Basic Two-Tier AWS Architecture"
sidebar_current: "examples-aws"
---
# Basic Two-Tier AWS Architecture
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
2014-07-28 03:26:44 +02:00
an ELB serving traffic.
2014-07-28 03:23:42 +02:00
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
```
2014-07-28 03:23:42 +02:00
# 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}"
}
```