Terraform 试图替换现有资源

Question

抱歉，如果这是一个虚拟问题，但我是 terraform 的新手，我可以找到任何文档或涵盖此场景的任何内容。

我有一个 资源组 = rg1，它有一个 vnet = vnet1 和一个 subnet = subnet1.

我正在尝试在同一个 vnet (vnet1) 中创建一个新的 子网 (subnet2)，terraform 出现以下错误。

~ name = "subnet1" -> "subnet2" # forces replacement

Plan: 1 to add, 0 to change, 1 to destroy.

谁能告诉我为什么 terraform 会替换已创建的子网？有可能的解决方法吗？

编辑 1

抱歉没有包含代码，请在下面找到相同的代码；

main.tf

resource "azurerm_resource_group" "rg" {
  name     = var.rgname
  location = var.rglocation
}

resource "azurerm_virtual_network" "vnet" {
  name                = var.vnetname
  address_space       = [var.vnet_address_space]
  location            = azurerm_resource_group.rg.location
  resource_group_name = azurerm_resource_group.rg.name
}

resource "azurerm_subnet" "vnet_subnets" {
  name                 = var.subnet_name
  resource_group_name  = azurerm_resource_group.rg.name
  virtual_network_name = azurerm_virtual_network.vnet.name
  address_prefixes     = [var.subnet_prefix]
}

Tfvars

rglocation = "westus"
rgname     = "rg1"

vnetname           = "vnet1"
vnet_address_space = "10.0.0.0/16"

subnet_name   = "subnet2"
subnet_prefix = "10.0.2.0/24"

Variable.tf

variable "rglocation" {
}
variable "rgname" {
}
variable "vnetname" {
}
variable "vnet_address_space" {
}
variable "subnet_prefix" {
}
variable "subnet_name" {
}

错误信息

Terraform will perform the following actions:

  # azurerm_subnet.vnet_subnets must be replaced
-/+ resource "azurerm_subnet" "vnet_subnets" {
      ~ address_prefix                                 = "10.0.1.0/24" -> (known after apply)
      ~ address_prefixes                               = [
          - "10.0.1.0/24",
          + "10.0.2.0/24",
        ]
      ~ id                                             = "" -> (known after apply)
      ~ name                                           = "subnet1" -> "subnet2" # forces replacement
      - service_endpoint_policy_ids                    = [] -> null
      - service_endpoints                              = [] -> null
        # (4 unchanged attributes hidden)
    }

Plan: 1 to add, 0 to change, 1 to destroy.

Answer 1

发生这种情况是因为您基本上是在覆盖您的 TF 文件。因此，先前的子网会因新子网而被破坏。 re-using 不同资源的相同代码的正确方法是通过 workspaces 或在不同文件夹中完全分开不同的设置。

但在我看来，在你的情况下你想添加新的子网，所以你最后会有两个。在这种情况下，您应该使用 count or for_each。这样您将使用循环创建两个子网。

为此，您的变量应该是列表：

subnet_name   = ["subnet1", "subnet2"]
subnet_prefix = ["10.0.1.0/24","10.0.2.0/24"]

然后

resource "azurerm_subnet" "vnet_subnets" {
  count                = length(var.subnet_name)
  name                 = var.subnet_name[count.index]
  resource_group_name  = azurerm_resource_group.rg.name
  virtual_network_name = azurerm_virtual_network.vnet.name
  address_prefixes     = [var.subnet_prefix[count.index]]
}

Terraform 试图替换现有资源

Terraform trying to replace existing resource

azure

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terraform-provider-azure