Terraform 的 random_shuffle 提供程序的奇怪行为 [英] Weird behavior of Terraform's random_shuffle provider

问题描述

我有以下配置:

variable "private_subnets" {
  default = ["subnet-A", "subnet-B"]
}

resource "random_shuffle" "az" {
  input = ["${var.private_subnets}"]
  result_count = 1
}

module "server" {
  source = "./modules/aws-ec2"
  instance_count = 3
  name = "${var.env}-server"
  stack = "server"
  role = "server"
  ami = "${lookup(var.aws_amis, var.aws_region, "")}"
  instance_type = "t2.micro"
  subnet_id = "${random_shuffle.az.result[0]}"
  vpc_security_group_ids = ["${var.security_groups}"]
}

我原以为 Terraform 会为每个实例随机选择一个 subnet_id，但它总是选择列表中的第一项，即 subnet-A.根据要创建的实例数从列表中随机选择项目的最佳/建议方法是什么?

I was expecting Terraform would selected a random subnet_id for every instance but it's always selecting the first item in the list which is subnet-A. What is the best/suggested way of randomly selecting an item off a list based on the number of instances to be created?

提前致谢！

推荐答案

random_shuffle 像大多数 Terraform 资源一样接受 count 参数，所以如果你这样做:

random_shuffle like most Terraform resources accepts the count parameter so if you do this like this:

resource "random_shuffle" "az" {
  input = ["${var.private_subnets}"]
  result_count = 1
  count = 3
}

它将为您提供 3 个阵列，每个阵列有 1 个子网.访问它取决于您在模块中创建实例的确切方式，但大多数情况下您在 aws_instance 资源 上使用计数，因此它将类似于:

It will give you 3 arrays with 1 subnet each. Accessing it will depend on how exactly you create the instances inside your module but most you're using count on aws_instance resource so it will be something like:

resource "aws_instance" "foo" {
   count = 3
   subnet_id = ${element(random_shuffle.az, count.index)}
}

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