Terraform模块传参失败：FunctionApp变量配置问题排查

错误原因 #

报错提示service_plan_id和storage_account_access_key不是Function App模块的合法参数，本质是Function App模块的variable.tf未定义这两个输入变量，同时模块内部的main.tf也没有正确引用变量。

修复步骤 #

1. 完善Function App模块的variable.tf #

在../../modules/FunctionApp/test/variable.tf中添加缺失的变量定义：

variable "resourcegroupname" {
  type        = string
  description = "The name of the resource group"
}

variable "location" {
  type        = string
  description = "resources should deploy only on 'eastus' as per the policy"
}

variable "functionappname" {
  type = string
}

variable "storageaccountname"{
  type = string 
  description = "The name of the Storage Account"
}

variable "stack_version" {
  type = map
}

# 添加以下两个缺失的变量
variable "service_plan_id" {
  type        = string
  description = "ID of the App Service Plan to associate with the Function App"
}

variable "storage_account_access_key" {
  type        = string
  description = "Primary access key of the Storage Account"
}

2. 修正Function App模块的main.tf #

模块内部的azurerm_windows_function_app资源错误使用了未定义的裸变量，需要替换为var.前缀的模块输入变量：

resource "azurerm_windows_function_app" "win-fn" {
  name                = var.functionappname
  resource_group_name = var.resourcegroupname
  location            = var.location

  storage_account_name       = var.storageaccountname
  # 修正为引用模块输入变量
  storage_account_access_key = var.storage_account_access_key
  service_plan_id            = var.service_plan_id

  site_config {
    ftps_state = "FtpsOnly"
    application_stack {
      node_version = lookup(var.stack_version, "node", null)
      java_version = lookup(var.stack_version, "java", null)
    }
  }
}

3. 验证App Service Plan模块的输出 #

确保ApplicationServicePlan模块的output.tf正确输出了服务计划的ID（app_sp_out对应服务计划的id属性），示例如下：

# ../../modules/ApplicationServicePlan/output.tf
output "app_sp_out" {
  value = azurerm_service_plan.your_service_plan_resource.id
}

验证修复 #

执行terraform init重新初始化模块，再运行terraform plan即可正常检测配置，不再出现参数错误。

内容的提问来源于stack exchange，提问作者Uday Kiran