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Description

AWS have added a new feature to Network Load Balancers, whereby they can now target an ALB via the ALB's ARN. This allows NLBs to perform level 4 load balancing and pass traffic directly to an ALB for level 7 load balancing.

New or Affected Resource(s)

• aws_lb_target_group
• aws_lb_target_group_attachment

Potential Terraform Configuration

resource "aws_lb_target_group" "alb_example" {
  name        = "tf-example-lb-tg"
  port        = 80
  protocol    = "HTTP"
  target_type = "alb"
  vpc_id      = aws_vpc.main.id
}

resource "aws_lb_target_group_attachment" "test" {
  target_group_arn = aws_lb_target_group.alb_example.arn
  target_id        = aws_lb.alb.arn
  port             = 80
}

References

• Blog post announcing new feature: https://aws.amazon.com/blogs/networking-and-content-delivery/application-load-balancer-type-target-group-for-network-load-balancer/
• https://docs.aws.amazon.com/elasticloadbalancing/latest/APIReference/API_CreateTargetGroup.html
• https://docs.aws.amazon.com/elasticloadbalancing/latest/APIReference/API_RegisterTargets.html
• https://docs.aws.amazon.com/elasticloadbalancing/latest/APIReference/API_DeregisterTargets.html
• https://docs.aws.amazon.com/elasticloadbalancing/latest/APIReference/API_TargetGroup.html