如何在Azure中通过Terraform部署无负载均衡器等组件的VM

Terraform并没有直接的disabled关键字来禁用资源，你可以通过以下几种简单方法来实现需求：

• 直接注释/删除不需要的资源块
  这是最直观的方式：把负载均衡器、可用性集、启动诊断对应的存储资源块用#单行注释，或者/* */块注释掉，同时记得删除VM资源中对这些资源的引用（比如availability_set_id = azurerm_availability_set.example.id这种行也要注释或删掉），否则会因为找不到依赖资源报错。

  示例：

  # 注释掉可用性集资源
  # resource "azurerm_availability_set" "example" {
  #   name                = "example-avset"
  #   location            = azurerm_resource_group.example.location
  #   resource_group_name = azurerm_resource_group.example.name
  # }
  
  resource "azurerm_linux_vm" "example" {
    name                = "example-vm"
    location            = azurerm_resource_group.example.location
    resource_group_name = azurerm_resource_group.example.name
    # 同时注释掉VM里对可用性集的引用
    # availability_set_id = azurerm_availability_set.example.id
    size                = "Standard_D2s_v3"
    admin_username      = "adminuser"
    admin_password      = "P@ssw0rd123!"
  
    # 禁用启动诊断：直接设置enabled为false
    boot_diagnostics {
      enabled = false
    }
  
    network_interface_ids = [azurerm_network_interface.example.id]
  
    os_disk {
      caching              = "ReadWrite"
      storage_account_type = "Premium_LRS"
    }
  
    source_image_reference {
      publisher = "Canonical"
      offer     = "0001-com-ubuntu-server-jammy"
      sku       = "22_04-lts"
      version   = "latest"
    }
  }
  

• 用count参数控制资源是否创建
  如果你想保留代码，方便后续随时启用这些组件，可以给目标资源添加count参数，通过变量控制是否创建资源。比如定义一个布尔变量，当变量为false时，资源不会被创建。

  示例：

  # 定义控制变量
  variable "enable_availability_set" {
    type    = bool
    default = false
  }
  
  variable "enable_boot_diagnostics" {
    type    = bool
    default = false
  }
  
  # 可用性集：根据变量决定是否创建
  resource "azurerm_availability_set" "example" {
    count               = var.enable_availability_set ? 1 : 0
    name                = "example-avset"
    location            = azurerm_resource_group.example.location
    resource_group_name = azurerm_resource_group.example.name
  }
  
  resource "azurerm_linux_vm" "example" {
    name                = "example-vm"
    location            = azurerm_resource_group.example.location
    resource_group_name = azurerm_resource_group.example.name
    # 只有启用可用性集时才引用，否则设为null
    availability_set_id = var.enable_availability_set ? azurerm_availability_set.example[0].id : null
    size                = "Standard_D2s_v3"
    admin_username      = "adminuser"
    admin_password      = "P@ssw0rd123!"
  
    # 启动诊断通过变量控制启用状态
    boot_diagnostics {
      enabled = var.enable_boot_diagnostics
      # 如果启用，再指定存储账号；禁用的话可以删掉storage_account_uri行
      storage_account_uri = var.enable_boot_diagnostics ? azurerm_storage_account.example.primary_blob_endpoint : null
    }
  
    network_interface_ids = [azurerm_network_interface.example.id]
  
    os_disk {
      caching              = "ReadWrite"
      storage_account_type = "Premium_LRS"
    }
  
    source_image_reference {
      publisher = "Canonical"
      offer     = "0001-com-ubuntu-server-jammy"
      sku       = "22_04-lts"
      version   = "latest"
    }
  }
  

• 启动诊断的单独处理
  启动诊断不需要删除存储账号（如果只是禁用功能），直接在VM的boot_diagnostics块中设置enabled = false即可，这样就不会启用该功能，也无需引用存储账号。

内容的提问来源于stack exchange，提问作者Azure Wizzard