amazon-web-services - 错误 aws_alb_target_group 设置了 "count"，必须在特定实例上访问其属性

Question

我正在使用 Terraform v0.12.26并设置和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
  }
}

本地人长这样:

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

当我跑 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]

我关注了 this implementation

知道如何修复它吗？

输出

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

Answer 1

自 aws_alb_target_group.http 是一个计数资源，您需要通过索引引用特定实例或将它们全部作为列表引用 [*] (又名 Splat Expressions )如下:

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

target_groups_arn 输出将是 TG ARN 的列表。