Use terraform to create multiple listeners with same configurations for multiple load balancer ARN&#-CodePudding

I have a resource "aws_lb_listener" with a default_action that needs to be added for multiple Load balancers. The way I see is creating individual resources with load_balancer_arn for all the load balancers.

Since the default action is common, Is there a way to create listener for each AWS LB

resource "aws_lb" "front_end" {
  # ...
}

resource "aws_lb" "front_end_2" {
  # ...
}


resource "aws_lb" "front_end_3" {
  # ...
}

resource "aws_lb_listener" "front_end" {
  load_balancer_arn = ["${aws_lb.front_end.arn}", "${aws_lb.front_end_2.arn}", "${aws_lb.front_end_3.arn}"] // I know this is incorrect but something like this (for each LB, create listener with following config)
  port              = "443"
  protocol          = "HTTPS"

  default_action {
    ....
    }
  }
}

In the above example, the listener configuration for all the three Load balancers is same. Hence wanting to create listener for each load balancer.

CodePudding user response：

Assuming that you want to keep your aws_lb as 3 independent resources, then you can use for_each to create 3 listeners for them.

resource "aws_lb_listener" "front_end" {

  for_each = toset([aws_lb.front_end.arn, aws_lb.front_end_2.arn, aws_lb.front_end_3.arn])

  load_balancer_arn = each.value
  port              = "443"
  protocol          = "HTTPS"

  default_action {
    ....
    }
  }
}