resource "aws_elb" "example" {
  name = "terraform-asg-example"
  availability_zones = ["${data.aws_availability_zones.all.names}"]
}

resource "aws_elb" "example" {
  name = "terraform-asg-example"
  availability_zones = ["${data.aws_availability_zones.all.names}"]
  listener {
        lb_port = 80
        lb_protocol = "http"
        instance_port = "${var.server_port}"
        instance_protocol = "http"
    }
}