lb.tf

resource "aws_lb_target_group" "my-target-group" {
  health_check {
    interval            = 10
    path                = "/"
    protocol            = "HTTP"
    timeout             = 5
    healthy_threshold   = 5
    unhealthy_threshold = 2
  }

  name        = "my-test-tg"
  port        = 80
  protocol    = "HTTP"
  target_type = "instance"
  vpc_id      = "${aws_vpc.main.id}"

}


resource "aws_lb" "my-aws-alb" {
  name     = "my-test-alb"
  internal = false

  security_groups = [
    "${aws_security_group.my-alb-sg.id}",
  ]

  subnets            = "${aws_subnet.public_subnet.*.id}"

  tags = {
    Name = "my-test-alb"
  }

  ip_address_type    = "ipv4"
  load_balancer_type = "application"
}

resource "aws_lb_listener" "my-test-alb-listner" {
  load_balancer_arn = "${aws_lb.my-aws-alb.arn}"
  port              = 80
  protocol          = "HTTP"

  default_action {
    type             = "forward"
    target_group_arn = "${aws_lb_target_group.my-target-group.arn}"
  }
}

resource "aws_security_group" "my-alb-sg" {
  name   = "my-alb-sg"
#  vpc_id = "${var.vpc_id}"
  vpc_id      = "${aws_vpc.main.id}"
}

resource "aws_security_group_rule" "inbound_ssh" {
  from_port         = 22
  protocol          = "tcp"
  security_group_id = "${aws_security_group.my-alb-sg.id}"
  to_port           = 22
  type              = "ingress"
  cidr_blocks       = ["0.0.0.0/0"]
}

resource "aws_security_group_rule" "inbound_http" {
  from_port         = 80
  protocol          = "tcp"
  security_group_id = "${aws_security_group.my-alb-sg.id}"
  to_port           = 80
  type              = "ingress"
  cidr_blocks       = ["0.0.0.0/0"]
}

resource "aws_security_group_rule" "outbound_all" {
  from_port         = 0
  protocol          = "-1"
  security_group_id = "${aws_security_group.my-alb-sg.id}"
  to_port           = 0
  type              = "egress"
  cidr_blocks       = ["0.0.0.0/0"]
}

resource "aws_lb_target_group_attachment" "attach" {
  target_group_arn = "${aws_lb_target_group.my-target-group.arn}"
  count = length(aws_instance.my-test-instance)
  target_id = aws_instance.my-test-instance[count.index].id 
  port             = 80
}