问题

抱歉，我理解你需要中文翻译，以下是你提供的部分内容的翻译：

我正在使用Terraform的Incapsula提供程序。具体来说，我在使用资源：incapsula_data_centers_configuration。正如您在文档中所看到的，它指出：

您可以根据需要配置多个origin_servers。在我的情况下，我只有一个数据中心，但我需要根据我要保护的应用程序的数量来变化origin_servers的数量。

以下是一些代码：

```hcl
variable "ip_addresses"{
  default = [
    "1.2.3.4", "2.3.4.5"
  ] 
}

resource "incapsula_data_centers_configuration" "single_dc" {
  
    site_id = incapsula_site.pre-site.id
    site_topology = var.site_topology
    site_lb_algorithm = "BEST_CONNECTION_TIME"
    fail_over_required_monitors = "MOST"
    is_persistent = true

    data_center {
      name = var.single_dc_name
      dc_lb_algorithm = "LB_LEAST_PENDING_REQUESTS" 
      origin_server{
        for_each = toset(var.ip_addresses)
        address = each.value
      }
    }
}

而我遇到的错误是：

错误：无法在此上下文中使用each.value
│
│ 在modules/pre-site/main.tf的第31行，位于resource "incapsula_data_centers_configuration" "single_dc"内：
│ 31: address = each.value

你能帮助我解决这个问题吗？

<details>
<summary>英文:</summary>

I am using the Incapsula provider for Terraform. Specifically the resource: incapsula_data_centers_configuration. As you can see in the documentation it indicates that:

You can configure as many origin_servers, as you need. In my case I have a single data_center but I need to be able to vary the number of origin_servers depending on the application I am protecting.

Here is some of the code: 

variable "ip_addresses"{
default = [
"1.2.3.4", "2.3.4.5"
]
}

resource "incapsula_data_centers_configuration" "single_dc" {

site_id = incapsula_site.pre-site.id
site_topology = var.site_topology
site_lb_algorithm = "BEST_CONNECTION_TIME"
fail_over_required_monitors = "MOST"
is_persistent = true

data_center {
  name = var.single_dc_name
  dc_lb_algorithm = "LB_LEAST_PENDING_REQUESTS" 
  origin_server{
    for_each = toset(var.ip_addresses)
    address = each.value
  }
}

}

And the error I have is the following: 

 Error: each.value cannot be used in this context
│
│   on modules/pre-site/main.tf line 31, in resource "incapsula_data_centers_configuration" "single_dc":
│   31:         address = each.value


Could you help me to resolve the problem?

</details>


# 答案1
**得分**: 2

你需要使用[动态块](https://developer.hashicorp.com/terraform/language/expressions/dynamic-blocks)：

```hcl
resource "incapsula_data_centers_configuration" "single_dc" {
  
    site_id = incapsula_site.pre-site.id
    site_topology = var.site_topology
    site_lb_algorithm = "BEST_CONNECTION_TIME"
    fail_over_required_monitors = "MOST"
    is_persistent = true

    data_center {
      name = var.single_dc_name
      dc_lb_algorithm = "LB_LEAST_PENDING_REQUESTS" 
      dynamic "origin_server" {
        for_each = toset(var.ip_addresses)
        content {            
            address = origin_server.value
        }
      }
    }
}

resource "incapsula_data_centers_configuration" "single_dc" {
  
    site_id = incapsula_site.pre-site.id
    site_topology = var.site_topology
    site_lb_algorithm = "BEST_CONNECTION_TIME"
    fail_over_required_monitors = "MOST"
    is_persistent = true

    data_center {
      name = var.single_dc_name
      dc_lb_algorithm = "LB_LEAST_PENDING_REQUESTS" 
      dynamic "origin_server" {
        for_each = toset(var.ip_addresses)
        content {            
            address = origin_server.value
        }
      }
    }
}