使用for_each在Terraform中创建多个Alias记录

时间:2020-07-28 15:25:22

标签: amazon-web-services dns terraform alias

我正在尝试使用for_each在Terraform中创建多个别名DNS记录。指定别名的名称和区域ID时出现错误。我的问题是如何从定义为一组字符串的变量中读取?下面是我的代码块和定义的变量:

    resource "aws_route53_record" "alias_records" {
      for_each = var.alias_names
      zone_id  = aws_route53_zone.zone.zone_id
      name     = each.key
      type     = "A"
    
      alias {
        name                   = var.alias_dns_names[each.key]
        zone_id                = var.alias_zone_ids[each.key]
        evaluate_target_health = false
      }
    }

    variable "alias_names" {
      type = set(string)
    }
    variable "alias_dns_names" {
      type = set(string)
    }
    variable "alias_zone_ids" {
      type = set(string)
    }
    Error: Invalid index

      on alias.tf line 8, in resource "aws_route53_record" "alias_records":
       8:     name                   = var.alias_dns_names[each.key]
    
    This value does not have any indices.
    
    
    Error: Invalid index
    
      on alias.tf line 9, in resource "aws_route53_record" "alias_records":
       9:     zone_id                = var.alias_zone_ids[each.key]
    
    This value does not have any indices.
    alias_names = [
      "alias1",
      "alias2",
      "alias3"
    }

    alias_dns_names = [
      "alias_dns_1",
      "alias_dns_2",
      "alias_dns_3"
    }

    alias_zone_ids = [
      "alias_zone_1",
      "alias_zone_2",
      "alias_zone_3"
    }

1 个答案:

答案 0 :(得分:0)

集合数据结构是无序的,其元素除其值外没有其他标识符,因此集合类型不适用于您的用例。

由于您似乎在这里描述了同一基础对象的三个不同方面,所以我认为从模块中公开该内容的最便捷方法是将其作为对象映射,如下所示:

variable "aliases" {
  type = map(object({
    zone_id  = string
    dns_name = string
  }))
}

然后,您可以单独使用此变量来捕获每个别名记录所需的所有三个值:

  aliases = {
    alias1 = {
      zone_id  = "alias_zone_1"
      dns_name = "alias_dns_1"
    }
    alias2 = {
      zone_id  = "alias_zone_2"
      dns_name = "alias_dns_2"
    }
    alias3 = {
      zone_id  = "alias_zone_3"
      dns_name = "alias_dns_3"
    }
  }

任何数据类型的映射都可以直接与资源for_each一起使用,其中each.key代表映射键,each.value代表值。因此,您可以像这样更改资源块:

resource "aws_route53_record" "alias_records" {
  for_each = var.aliases
  zone_id  = aws_route53_zone.zone.zone_id
  name     = each.key
  type     = "A"

  alias {
    zone_id                = each.value.zone_id
    name                   = each.value.dns_name
    evaluate_target_health = false
  }
}

由于地图的元素是对象,因此可以从each.value访问它们,以获取与原始地图中的每个键相对应的zone_iddns_name值。