如何在 terraform 中构建地图列表 [英] how do i build a list of maps in terraform

问题描述

我想在 terraform 中构建地图列表.有没有可以让我这样做的手术.

i would like to build a list of maps in terraform. Is there an operation that would let me do that.

例如:我想构建结构(来自 aws_instance.test.*.private_ip)

eg: i would like to build the structure (from aws_instance.test.*.private_ip)

addresses = [
   {
     address = private_ip-1
   },
   {
     address = private_ip-2
   }
   ...
]

推荐答案

抱歉，如果这个问题已经解决了，我知道这是一个老问题.

Apologies if this has already been resolved, I see that it's an older question.

我不确定这是否是最佳做法，但这是我尝试达到所需状态的方式.

I'm not sure if this is best practice, but this is the way I would attempt to reach the desired state.

使用 null_resource 您可以执行以下操作:

Using the null_resource you'd be able to do the following:

variable "addresses" {
  type = "list"

  default = [
    "private_ip-1",
    "private_ip-2",
    "private_ip-3"
  ]
}

resource "null_resource" "test" {
  count = "${length(var.addresses)}"

  triggers {
    address = "${element(var.addresses, count.index)}"
  }
}

output "addresses" {
  value = "${null_resource.test.*.triggers}"
}

并且有这个输出:

Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

Outputs:

addresses = [
    {
        address = private_ip-1
    },
    {
        address = private_ip-2
    },
    {
        address = private_ip-3
    }
]

我目前使用的是 terraform 0.11.5，null_resource 似乎已添加到 0.6.7

I'm currently on terraform 0.11.5, null_resource appears to have been added in 0.6.7

但 null_resource 触发器有一些限制.插值变量只能产生字符串.因此，不幸的是，您将无法插入会导致列表或地图的值；例如:

There are limitations to the null_resource triggers though. interpolated variables can only result in strings. So, unfortunately you won't be able to interpolate a value that would result in a list or a map; for example:

resource "null_resource" "test" {
  triggers {
    mylist = "${var.addresses}"
  }
}

会导致错误

错误:null_resource.test:触发器(地址):''预期类型'string'，得到不可转换类型'[]interface {}'

Error: null_resource.test: triggers (address): '' expected type 'string', got unconvertible type '[]interface {}'

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