刚接触terraform时，我一直在使用count参数在Azure中创建VM。最佳实践建议使用For_each参数而不是使用count。我遇到过想要更改某些服务器配置的问题。
我从人们的建议中提取了一些代码，在下面的代码中，它将为每个虚拟机创建一个托管磁盘。
然而，托管磁盘并不是独立的，因为如果我更改托管磁盘的磁盘大小，它将更改所有虚拟机的磁盘大小。我如何才能实现每个虚拟机的托管磁盘具有不同的磁盘大小。我确实尝试将托管磁盘添加到每个虚拟机的变量局部变量中的单个键。
任何提示/建议将不胜感激！

Under a subdirectory 
#########################################################################################
variable.tf

variable "m_resource_group_name" {
  description = "This is defines the resouce grp name"

}

variable "m_location" {
  description = "This is defines the location"

}

variable "m_subnet_id" {

    description = "The ID of the subnet "
  
}

variable "m_admin_username" {

    description = "admin username"
 
}

 variable "m_vault_name_id" {
   description = "Azure Key Vault data source"
  type        = object({
    id                 = string
    name               = string
    resource_group_name = string
  })
}

variable "winserver-test-pw" {
  description = "admin pw"
}

############################# NEW variable map #######################

variable "vm_map" {
description = "values for the server"
  type = map(object({
    name = string
    size = string
  }))
default = {
  "vm1" = {
    name = "vm1"
    size = "Standard_DC2ds_v3"
    nic = "nic1"
    
  }

  "vm2" = {
    name = "vm2"
    size = "Standard_DC2ds_v3"
    nic = "nic1"
    
  }
}
}

variable "disk_template" {
  type = map(any)
  default = {
    disk1 = {
      managed_disk_name    = "data-disk1"
      managed_disk_type    = "StandardSSD_LRS"
      managed_disk_size    = "10"
      managed_disk_lun     = "2"
      managed_disk_caching = "ReadWrite"
      create_option        = "Empty"
      os_type              = "Windows"
    }
  }
}
#####################################################################################################
locals.tf
# Managed Disk

locals {
  disk_vm_flat = merge([
    for vm, vm_vals in var.vm_map : {
      for disk, disk_vals in var.disk_template :
      "${vm_vals.name}-${disk_vals.managed_disk_name}" =>  {
        name                 = vm_vals.name
        managed_disk_name    = disk_vals.managed_disk_name
        managed_disk_size    = disk_vals.managed_disk_size
        managed_disk_lun     = disk_vals.managed_disk_lun
        managed_disk_type    = disk_vals.managed_disk_type
        managed_disk_caching = disk_vals.managed_disk_caching
        os_type              = disk_vals.os_type
        create_option        = disk_vals.create_option
      }  if disk_vals.managed_disk_size != "0"
    }
  ]...) # Do not remove the dots. 
}

#######################################################################################################

main.tf

resource "azurerm_network_interface" "nic-multi-vms-01" {
  for_each            = var.vm_map
  name                = "${each.value.name}-nic" #append the keyname to nic at the end
  location            = var.m_location
  resource_group_name = var.m_resource_group_name

  ip_configuration {
    name                          = "${each.value.name}-ipconf"
    subnet_id                     = var.m_subnet_id
    private_ip_address_allocation = "Dynamic"

  }
}

resource "azurerm_windows_virtual_machine" "winservertest" {

  for_each = var.vm_map
  name                 = each.value.name
  resource_group_name = var.m_resource_group_name
  location            = var.m_location
  size                = each.value.size
  admin_username      = var.m_admin_username
  admin_password      = var.winserver-test-pw
  patch_mode               = "Manual" 
  enable_automatic_updates = false 
  network_interface_ids = [
    azurerm_network_interface.nic-multi-vms-01[each.key].id
  ]
  

os_disk {
    name = "${each.value.name}-OS"
    caching              = "ReadWrite"
    storage_account_type = "Standard_LRS"
    disk_size_gb         = 127
  }

source_image_reference {
    publisher = "MicrosoftWindowsServer"
    offer     = "WindowsServer"
    sku       = "2019-Datacenter"
    version   = "latest"
  }
}

resource "azurerm_managed_disk" "managed_disk" {
  for_each = local.disk_vm_flat
  name     = "${each.value.name}-${each.value.managed_disk_name}"
  location             = var.m_location
  resource_group_name  = var.m_resource_group_name
  storage_account_type = each.value.managed_disk_type
  create_option        = each.value.create_option
  os_type              = each.value.os_type
  disk_size_gb         = each.value.managed_disk_size
}

resource "azurerm_virtual_machine_data_disk_attachment" "disk_attach" {
  for_each = local.disk_vm_flat
  managed_disk_id = azurerm_managed_disk.managed_disk[each.key].id
  lun             = each.value.managed_disk_lun
  caching         = each.value.managed_disk_caching
  virtual_machine_id = azurerm_windows_virtual_machine.winservertest[each.value.name].id #amended
}


# ############################
# ### output info
# ############################

output "vm_ids" {
  value = { for vm, vm_vals in var.vm_map : vm => vm_vals }
}

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