azure - 如何从另一个模块中的模块获取值 - Terraform (Azure)

Question

我试图从一个模块中获取值(value)并在另一个模块中使用它。

我有模块 - vnet

resource "azurerm_virtual_network" "vnet" {
  name                = var.vnet_name
  resource_group_name = var.resource_group_name
  location            = var.location
  address_space       = var.address_space
}

resource "azurerm_subnet" "subnet" {
  name                 = "${var.vnet_name}-subnet"
  resource_group_name  = var.resource_group_name
  virtual_network_name = azurerm_virtual_network.vnet.name
  address_prefixes     = var.subnet_prefixes
}

并且输出是:

output "subnet_id" {
    value = "${azurerm_subnet.subnet.id}"
}

output "vnet_name" {
    value = "${azurerm_virtual_network.vnet.name}"
}

从这个模块中，我想获取我用来创建网卡的其他模块的 vnet 名称和子网 ID。

网卡模块

module "vnet" {
  source = "../vnet" 
}


resource "azurerm_network_interface" "nic" {
  name                = "${module.vnet.vnet_name}-nic"
  location            = "east us 2"
  resource_group_name = "null"

  ip_configuration {
    name                          = " "
    subnet_id                     = module.vnet.subnet_id
    private_ip_address_allocation = "Dynamic"
  }
}

这种方式有效，但是 terraform 计划，计划为每个资源创建 2 个资源，因为我使用的是获取值的方式。

在 nic 模块下，我再次使用 vnet 模块，因此它将创建第二个 vnet。

我的ma​​in.tf是

resource "azurerm_resource_group" "rg" {
  name     = var.resource_group.name
  location = var.resource_group.location
}

module "ib151w-vnet" {
  source              = "./modules/vnet"
    resource_group_name = azurerm_resource_group.rg.name
    vnet_name = "ib151w-vnet"
    address_space       = var.address_space
    subnet_prefixes     = var.subnet_prefixes
}

module "ib151w-nic" {
  source              = "./modules/nic"
  name                = "nic-test-123"
  location            = "east us 2"
  resource_group_name = "ib151w"
}

问题是如何获取要在 nic 模块内使用的 vnet 名称和子网 ID？

i know there is alot of better ways to establish my request but imjust learning terraform and trying this specific way :)

Answer 1

how can i get the vnet name and subnet id to use inside the nic module

您必须在根模块中显式传递这些值:

module "ib151w-nic" {
  source              = "./modules/nic"
  name                = "nic-test-123"
  location            = "east us 2"
  resource_group_name = "ib151w"

  vnet_name             = module.vnet.vnet_name
  subnet_id             = module.vnet.subnet_id
}

此外，您还必须修改 vnet 模块以使 vnet 和子实体有条件。例如，在 vent 模块中添加变量:

variable "should_create_vnet_and_subnet" {
    default = true
}

然后将资源设为条件:

resource "azurerm_virtual_network" "vnet" {

  count = should_create_vnet_and_subnet == true ? 1 : 0

  name                = var.vnet_name
  resource_group_name = var.resource_group_name
  location            = var.location
  address_space       = var.address_space
}

resource "azurerm_subnet" "subnet" {

  count = should_create_vnet_and_subnet == true ? 1 : 0

  name                 = "${var.vnet_name}-subnet"
  resource_group_name  = var.resource_group_name
  virtual_network_name = azurerm_virtual_network.vnet.name
  address_prefixes     = var.subnet_prefixes
}

还有其余的。基本上，您必须围绕条件资源重写整个 vnet 模块。