loadbalancer.tf

resource "aws_elb" "example" {
  name = "terraform-asg-example"
  security_groups = ["${aws_security_group.elb.id}"]
  
  subnets = ["${aws_subnet.main.id}"]

  listener {
    lb_port = 80
    lb_protocol = "http"
    instance_port = "80"
    instance_protocol = "http"
  }
}

resource "aws_vpc" "main" {
  cidr_block = "10.0.0.0/16"
}

resource "aws_subnet" "main" {
  vpc_id     = "${aws_vpc.main.id}"
  cidr_block = "10.0.1.0/24"
}

resource "aws_route_table" "r" {
  vpc_id = "${aws_vpc.main.id}"
  route {
    cidr_block = "0.0.0.0/0"
    gateway_id = "${aws_internet_gateway.gw.id}"
  }
}

resource "aws_internet_gateway" "gw" {
  vpc_id = "${aws_vpc.main.id}"
}

resource "aws_lb_target_group" "front_end" {
  port     = 80
  protocol = "HTTP"
  vpc_id   = "${aws_vpc.main.id}"
}

resource "aws_lb_listener" "example" {
  load_balancer_arn = "${aws_elb.example.arn}"
  port              = "80"
  protocol          = "http"
  
  default_action {
    type = "fixed-response"

    fixed_response {
      content_type = "text/plain"
      message_body = "Fixed response content"
      status_code  = "500"
    }
  }
}

resource "aws_lb_listener_rule" "front_end" {
  listener_arn = "${aws_lb_listener.example.arn}"
  priority = 99

  condition {
    field  = "host-header"
    values = ["*.www.playqtest.com"]
  }

  action {
    type             = "forward"
    target_group_arn = "${aws_lb_target_group.front_end.arn}"
  }
}

resource "aws_security_group" "elb" {
  name = "terraform-example-elb"
  
  vpc_id="${aws_vpc.main.id}"
  
  egress {
    from_port = 0
    to_port = 0
    protocol = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }
  ingress {
    from_port = 80
    to_port = 80
    protocol = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }
}