Terraform:如何从插值中获取布尔值? [英] Terraform: How to get a boolean from interpolation?

问题描述

我想为 prevent_destroy 元参数使用插值

I want to use an interpolated value for the prevent_destroy meta-parameter

当我编码时

lifecycle {
   # never destroy the IP address of the production stage,
   prevent_destroy = "${var.stage_name == "global" ? true : false }"
}

我明白了

* cannot parse 'prevent_destroy' as bool: strconv.ParseBool: parsing "${var.stage_name == "global" ? true : false }": invalid syntax

等效错误

lifecycle {
    prevent_destroy = "${var.stage_name == "global" ? 1 : 0 }"
}

当我定义一个本地定义时

When I define a local the definition

locals  {
  booltest = "${var.stage_name == "global" ? true : false }"
}

好像是经过，但指的是本地

seems to go through, but referring to the local

lifecycle {
    prevent_destroy = "${var.booltest}"
}

给我一​​个

* cannot parse 'prevent_destroy' as bool: strconv.ParseBool: parsing "${var.booltest}": invalid syntax

(也尝试使用 0 和 1)

(also tried with 0 and 1)

如何编码?我的版本是 Terraform v0.11.10

How can this be coded? My version is Terraform v0.11.10

推荐答案

可惜生命周期属性不支持插值:

Unfortunately lifecycle attributes do not support interpolation:

https://github.com/hashicorp/terraform/issues/3116https://github.com/hashicorp/terraform/issues/17294

但是，使用 count 您可以解决这个问题.大致:

However, using count you may work around this. Roughly:

resource "aws_instance" "indestructible" {
  count = "${var.prevent_destroy ? "1" : "0"}"
  lifecycle {
    prevent_destroy = "true"
  }
  ...
}

resource "aws_instance" "destructible" {
  count = "${var.prevent_destroy ? "0" : "1"}"
  lifecycle {
    prevent_destroy = "false"
  }

  ...
}

我个人会在环境之间使用相同的 prevent_destroy 设置，并在需要时明确销毁它们.

Personally I would use the same prevent_destroy setting between environments and destroy them explicitly when needed.

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