错误 aws_alb_target_group 设置了“计数”，必须在特定实例上访问其属性

Question

我正在使用Terraform v0.12.26和设置并aws_alb_target_group作为：

resource "aws_alb_target_group" "my-group" {
  count = "${length(local.target_groups)}"
  name = "${var.namespace}-my-group-${
    element(local.target_groups, count.index)
  }"

  port     = 8081
  protocol = "HTTP"
  vpc_id   = var.vpc_id

  health_check {
    healthy_threshold   = var.health_check_healthy_threshold
    unhealthy_threshold = var.health_check_unhealthy_threshold
    timeout             = var.health_check_timeout
    interval            = var.health_check_interval
    path                = var.path
  }

  tags = {
    Name = var.namespace
  }

  lifecycle {
    create_before_destroy = true
  }
}

当地人长这样：

locals {
  target_groups = [
    "green",
    "blue",
  ]
}

当我运行terraform apply它返回以下错误：

Error: Missing resource instance key

  on ../../modules/aws_alb/outputs.tf line 3, in output "target_groups_arn":
   3:     aws_alb_target_group.http.arn,

Because aws_alb_target_group.http has "count" set, its attributes must be
accessed on specific instances.

For example, to correlate with indices of a referring resource, use:
    aws_alb_target_group.http[count.index]

我遵循了这个实现

知道如何修复它吗？

输出

output "target_groups_arn" {
  value = [
    aws_alb_target_group.http.arn,
  ]
}

Answer 1

由于aws_alb_target_group.http是一个计数资源，您需要通过索引或所有这些实例作为列表[*]（又名Splat Expressions）引用特定实例，如下所示：

output "target_groups_arn" {
  value = aws_alb_target_group.http[*].arn,
}

该target_groups_arn输出将是TG ARNS的列表。