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}"]
}