aws_lb_target_group_attachment：将多个实例附加到每个target_group

Question

每个NLB我有多个target_group，我需要将多个实例附加到每个target_group。 target_id是aws_lb_target_group_attachment资源中的一个字符串，我看不到任何简单的方法来实现。这就是我正在做的atm：

vars.tf

variable "nlb_listeners" {
  default = [
    {
      protocol     = "TCP"
      target_port  = "80"
      health_port  = "1936"
    },
    {
      protocol     = "TCP"
      target_port  = "443"
      health_port  = "1936"
    }
  ]
}

实例.tf

// Get the instance ids of the NLB members  
data "aws_instances" "nlb_insts" {
  instance_tags = {
   Name = "${var.vpc_names[var.idx]}${var.inst_role}0*"
  }
  instance_state_names = ["running", "stopped"]
}

// EC2 instances
resource "aws_instance" "insts" {
  count         = var.inst_count
  instance_type = var.inst_type
  .......
}

balancer.tf

// Creates the target-group
resource "aws_lb_target_group" "nlb_target_groups" {
  count                = length(var.nlb_listeners)
  name                 = "nlb-tgr-${lookup(var.nlb_listeners[count.index], "target_port")}"
  deregistration_delay = var.deregistration_delay
  port                 = lookup(var.nlb_listeners[count.index], "target_port")
  protocol             = lookup(var.nlb_listeners[count.index], "protocol")
  vpc_id               = var.vpc_ids[var.idx]

  health_check {
    port                = lookup(var.nlb_listeners[count.index], "health_port")
    protocol            = lookup(var.nlb_listeners[count.index], "protocol")
    interval            = var.health_check_interval
    unhealthy_threshold = var.unhealthy_threshold
    healthy_threshold   = var.healthy_threshold
  }
}

// Attach the target groups to the instance(s)
resource "aws_lb_target_group_attachment" "tgr_attachment" {
  count            = length(var.nlb_listeners)
  target_group_arn = element(aws_lb_target_group.nlb_target_groups.*.arn, count.index)
  target_id        = [for sc in range(var.inst_count) : data.aws_instances.nlb_insts.ids[sc]]
  port             = lookup(var.nlb_listeners[count.index], "target_port")
}

所以，我收到此错误：

  

错误：属性值类型错误

     资源中../../modules/elb/balencer.tf第31行的

  “ aws_lb_target_group_attachment”“ tgr_attachment”：31：target_id =   [对于范围（2）中的sc：data.aws_instances.nlb_insts.ids [sc]]

     

属性“ target_id”的值不合适：必须输入字符串。

任何人都知道如何实现这一目标吗？