terraform-lab/aws_fargate/alb.tf

resource "aws_lb_target_group" "api_lb_target" {
  name        = "${var.project}-target-group"
  port        = var.service_port
  protocol    = "HTTP"
  target_type = "ip"
  vpc_id      = aws_vpc.app_vpc.id
  health_check {
    enabled = true
    path    = "/health"
  }
  depends_on = [aws_alb.api_lb]
}

resource "aws_alb" "api_lb" {
  name               = "${var.project}-api-lb"
  internal           = false
  load_balancer_type = "application"
  subnets            = [for s in aws_subnet.public_subnet : s.id]
  security_groups = [
    aws_security_group.http.id,
    aws_security_group.https.id,
    aws_security_group.egress_all.id,
    aws_security_group.ingress_api.id,
  ]
  depends_on = [aws_internet_gateway.igw]
}

resource "aws_alb_listener" "api_http_listener" {
  load_balancer_arn = aws_alb.api_lb.arn
  port              = "80"
  protocol          = "HTTP"
  default_action {
    type             = "forward"
    target_group_arn = aws_lb_target_group.api_lb_target.arn
  }
}