List terraform：通过模块传递列表，获得；错误：。。。应该是一个列表；

ETA:在terraform github问题中找到讨论。众所周知而且非常。。。“特殊的”。。。问题

---

通过两个其他模块（从

top.tf

到

autoscaling\u group

到

launch\u configuration

）传递列表后，这两个模块都将变量定义为

type=“list”

，我从

地形图
收到以下投诉：

"Error: module.autoscaling_group.aws_launch_configuration.this: 
security_groups: should be a list"

它似乎将参数识别为列表类型（如果我从变量声明中删除类型规范，它会抱怨）。但我发现消除错误的唯一方法是将最终用法用列表括号括起来。这似乎违反直觉（我还没有看到当我这样做时，
apply
会发生什么情况）-发生了什么


顺序如下：


top.tf
调用
security\u组
top.tf
还调用
autoscaling
，传递带有安全组
id
输出的列表
autoscaling
调用
launch\u配置
，将参数传递给

这是布局，下面是.tf文件的内容

.
├── autoscaling_group
│   └── main.tf
├── launch_configuration
│   └── main.tf
├── security_group
│   └── main.tf
└── top.tf

top.tf中的起始调用是：

module "autoscaling_group" {
  source = "launch_configuration"
  security_groups = ["${module.security_group.id}"]
  }

有问题的用法在
launch\u configuration/main.tf
中：

resource "aws_launch_configuration" "this" {
  name_prefix = "foobar"
  image_id = "this_is_fake"
  instance_type = "ts.small"
  security_groups = "${var.security_groups}"
  }

provider "aws" {
  region = "us-east-1"
  }

module "security_group" {
  source = "security_group"
  }

module "autoscaling_group" {
  source = "launch_configuration"
  security_groups = ["${module.security_group.id}"]
  }

variable "security_groups" {
  type = "list"
  description = "The security groups to attach to launched instances."
  }

module "launch_configuration" {
  source = "launch_configuration"
  security_groups = "${var.security_groups}"
  }

resource "aws_autoscaling_group" "service_autoscaling_group" {

  name_prefix = "foobar"

  min_size = 1
  max_size = 1
  health_check_type = "EC2"
  launch_configuration = "${module.launch_configuration.name}"
  vpc_zone_identifier = ["this_is_fake"]
  }

variable "security_groups" {
  type = "list"
  description = "The security groups to attach to launched instances."
  }

output "name" {
  value = "${aws_launch_configuration.this.name}"
  }

resource "aws_launch_configuration" "this" {
  name_prefix = "foobar"
  image_id = "this_is_fake"
  instance_type = "ts.small"
  security_groups = "${var.security_groups}"
  }

output "id" {
  value = "${aws_security_group.this.id}"
  description = "The security group ID."
  }

resource "aws_security_group" "this" {

  name_prefix = "foobar"
  vpc_id      = "this_is_fake"
  description = "foobar"

  egress {
    from_port       = 0
    to_port         = 0
    protocol        = "-1"
    cidr_blocks     = ["0.0.0.0/0"]
    }
  }


如果我添加括号：
[“${var.security\u groups}”]
我不会得到错误
如果我从
launch\u configuration/main.tf
中的变量定义块中删除
type=“list”
，
terraform plan
抱怨：
module.autoscaling\u group.var.security\u groups:module autoscaling\u groups中的变量安全组应该是字符串类型，got list


top.tf的内容
：

resource "aws_launch_configuration" "this" {
  name_prefix = "foobar"
  image_id = "this_is_fake"
  instance_type = "ts.small"
  security_groups = "${var.security_groups}"
  }

provider "aws" {
  region = "us-east-1"
  }

module "security_group" {
  source = "security_group"
  }

module "autoscaling_group" {
  source = "launch_configuration"
  security_groups = ["${module.security_group.id}"]
  }

variable "security_groups" {
  type = "list"
  description = "The security groups to attach to launched instances."
  }

module "launch_configuration" {
  source = "launch_configuration"
  security_groups = "${var.security_groups}"
  }

resource "aws_autoscaling_group" "service_autoscaling_group" {

  name_prefix = "foobar"

  min_size = 1
  max_size = 1
  health_check_type = "EC2"
  launch_configuration = "${module.launch_configuration.name}"
  vpc_zone_identifier = ["this_is_fake"]
  }

variable "security_groups" {
  type = "list"
  description = "The security groups to attach to launched instances."
  }

output "name" {
  value = "${aws_launch_configuration.this.name}"
  }

resource "aws_launch_configuration" "this" {
  name_prefix = "foobar"
  image_id = "this_is_fake"
  instance_type = "ts.small"
  security_groups = "${var.security_groups}"
  }

output "id" {
  value = "${aws_security_group.this.id}"
  description = "The security group ID."
  }

resource "aws_security_group" "this" {

  name_prefix = "foobar"
  vpc_id      = "this_is_fake"
  description = "foobar"

  egress {
    from_port       = 0
    to_port         = 0
    protocol        = "-1"
    cidr_blocks     = ["0.0.0.0/0"]
    }
  }

autoscaling\u group/main.tf的内容：

resource "aws_launch_configuration" "this" {
  name_prefix = "foobar"
  image_id = "this_is_fake"
  instance_type = "ts.small"
  security_groups = "${var.security_groups}"
  }

provider "aws" {
  region = "us-east-1"
  }

module "security_group" {
  source = "security_group"
  }

module "autoscaling_group" {
  source = "launch_configuration"
  security_groups = ["${module.security_group.id}"]
  }

variable "security_groups" {
  type = "list"
  description = "The security groups to attach to launched instances."
  }

module "launch_configuration" {
  source = "launch_configuration"
  security_groups = "${var.security_groups}"
  }

resource "aws_autoscaling_group" "service_autoscaling_group" {

  name_prefix = "foobar"

  min_size = 1
  max_size = 1
  health_check_type = "EC2"
  launch_configuration = "${module.launch_configuration.name}"
  vpc_zone_identifier = ["this_is_fake"]
  }

variable "security_groups" {
  type = "list"
  description = "The security groups to attach to launched instances."
  }

output "name" {
  value = "${aws_launch_configuration.this.name}"
  }

resource "aws_launch_configuration" "this" {
  name_prefix = "foobar"
  image_id = "this_is_fake"
  instance_type = "ts.small"
  security_groups = "${var.security_groups}"
  }

output "id" {
  value = "${aws_security_group.this.id}"
  description = "The security group ID."
  }

resource "aws_security_group" "this" {

  name_prefix = "foobar"
  vpc_id      = "this_is_fake"
  description = "foobar"

  egress {
    from_port       = 0
    to_port         = 0
    protocol        = "-1"
    cidr_blocks     = ["0.0.0.0/0"]
    }
  }

launch\u configuration/main.tf的内容如下：

resource "aws_launch_configuration" "this" {
  name_prefix = "foobar"
  image_id = "this_is_fake"
  instance_type = "ts.small"
  security_groups = "${var.security_groups}"
  }

provider "aws" {
  region = "us-east-1"
  }

module "security_group" {
  source = "security_group"
  }

module "autoscaling_group" {
  source = "launch_configuration"
  security_groups = ["${module.security_group.id}"]
  }

variable "security_groups" {
  type = "list"
  description = "The security groups to attach to launched instances."
  }

module "launch_configuration" {
  source = "launch_configuration"
  security_groups = "${var.security_groups}"
  }

resource "aws_autoscaling_group" "service_autoscaling_group" {

  name_prefix = "foobar"

  min_size = 1
  max_size = 1
  health_check_type = "EC2"
  launch_configuration = "${module.launch_configuration.name}"
  vpc_zone_identifier = ["this_is_fake"]
  }

variable "security_groups" {
  type = "list"
  description = "The security groups to attach to launched instances."
  }

output "name" {
  value = "${aws_launch_configuration.this.name}"
  }

resource "aws_launch_configuration" "this" {
  name_prefix = "foobar"
  image_id = "this_is_fake"
  instance_type = "ts.small"
  security_groups = "${var.security_groups}"
  }

output "id" {
  value = "${aws_security_group.this.id}"
  description = "The security group ID."
  }

resource "aws_security_group" "this" {

  name_prefix = "foobar"
  vpc_id      = "this_is_fake"
  description = "foobar"

  egress {
    from_port       = 0
    to_port         = 0
    protocol        = "-1"
    cidr_blocks     = ["0.0.0.0/0"]
    }
  }

同样，如果我将括号括在上一个赋值
[“${var.security\u groups}”]
的RHS上，我看不到
地形平面图的错误。但是terraform将变量识别为列表（因为如果我从声明中删除
type=“list”
，它会抱怨它是列表类型）。那么，为什么它会抱怨希望这里有一个列表呢

security\u group/main.tf的内容
：

resource "aws_launch_configuration" "this" {
  name_prefix = "foobar"
  image_id = "this_is_fake"
  instance_type = "ts.small"
  security_groups = "${var.security_groups}"
  }

provider "aws" {
  region = "us-east-1"
  }

module "security_group" {
  source = "security_group"
  }

module "autoscaling_group" {
  source = "launch_configuration"
  security_groups = ["${module.security_group.id}"]
  }

variable "security_groups" {
  type = "list"
  description = "The security groups to attach to launched instances."
  }

module "launch_configuration" {
  source = "launch_configuration"
  security_groups = "${var.security_groups}"
  }

resource "aws_autoscaling_group" "service_autoscaling_group" {

  name_prefix = "foobar"

  min_size = 1
  max_size = 1
  health_check_type = "EC2"
  launch_configuration = "${module.launch_configuration.name}"
  vpc_zone_identifier = ["this_is_fake"]
  }

variable "security_groups" {
  type = "list"
  description = "The security groups to attach to launched instances."
  }

output "name" {
  value = "${aws_launch_configuration.this.name}"
  }

resource "aws_launch_configuration" "this" {
  name_prefix = "foobar"
  image_id = "this_is_fake"
  instance_type = "ts.small"
  security_groups = "${var.security_groups}"
  }

output "id" {
  value = "${aws_security_group.this.id}"
  description = "The security group ID."
  }

resource "aws_security_group" "this" {

  name_prefix = "foobar"
  vpc_id      = "this_is_fake"
  description = "foobar"

  egress {
    from_port       = 0
    to_port         = 0
    protocol        = "-1"
    cidr_blocks     = ["0.0.0.0/0"]
    }
  }

我也有同样的问题，应该在v0.12中解决：

如果您想将列表作为模块参数传递，这里有一个小技巧。我只发送一个字符串，然后将其解析为一个列表（AWS备份模块的示例）：

terraform.tf

/模块路径/variables.tf

/模块路径/main.tf

这是一个已知的问题，似乎：@！$！！%##$！！！