terraform/examples/aws-asg/main.tf

# Specify the provider and access details
provider "aws" {
  region = "${var.aws_region}"
}

resource "aws_elb" "web-elb" {
  name = "terraform-example-elb"

  # The same availability zone as our instances
  availability_zones = ["${split(",", var.availability_zones)}"]
  listener {
    instance_port = 80
    instance_protocol = "http"
    lb_port = 80
    lb_protocol = "http"
  }

  health_check {
    healthy_threshold = 2
    unhealthy_threshold = 2
    timeout = 3
    target = "HTTP:80/"
    interval = 30
  }

}

resource "aws_autoscaling_group" "web-asg" {
  availability_zones = ["${split(",", var.availability_zones)}"]
  name = "terraform-example-asg"
  max_size = "${var.asg_max}"
  min_size = "${var.asg_min}"
  desired_capacity = "${var.asg_desired}"
  force_delete = true
  launch_configuration = "${aws_launch_configuration.web-lc.name}"
  load_balancers = ["${aws_elb.web-elb.name}"]
  #vpc_zone_identifier = ["${split(",", var.availability_zones)}"]
  tag {
    key = "Name"
    value = "web-asg"
    propagate_at_launch = "true"
  }
}

resource "aws_launch_configuration" "web-lc" {
  name = "terraform-example-lc"
  image_id = "${lookup(var.aws_amis, var.aws_region)}"
  instance_type = "${var.instance_type}"
  # Security group
  security_groups = ["${aws_security_group.default.name}"]
  user_data = "${file("userdata.sh")}"
  key_name = "${var.key_name}"
}

# Our default security group to access
# the instances over SSH and HTTP
resource "aws_security_group" "default" {
  name = "terraform_example_sg"
  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"]
  }

  # outbound internet access
  egress {
    from_port = 0
    to_port = 0
    protocol = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }
}