如何将数据源从一个模块引用到另一个模块并将其作为变量传递给根模块？

Question

我的 terraform 目录结构如下：

terraform/
main.tf  modules  outputs.tf  provider.tf  variables.tf

./modules:
compute  network  resourcegroup

./modules/compute:
main.tf  outputs.tf  variables.tf

./modules/network:
main.tf  outputs.tf  variables.tf

./modules/resourcegroup:
main.tf  outputs.tf  variables.tf

资源组模块配置文件如下：

目的：在这个模块中，我引用了一个现有的资源组，我想用它来创建一个虚拟机及其关联的对象。

主文件

data "azurerm_resource_group" "tf-rg-external" {
  name = var.rg_name
}

变量.tf

variable "rg_name" {
  type = string

}

网络模块

目的：我想使用资源组模块中的资源组在此模块中引用。这样，我在一个地方定义并在 root 和其他模块中使用它，例如计算、应用服务、aks 等

主文件

# Reference existing Virtual Network
data "azurerm_virtual_network" "tf-vn" {
  name                = var.vnet_name
  resource_group_name = module.resource_groups.external_rg_name
}

# Reference existing subnet
data "azurerm_subnet" "tf-sn" {
  name                 = var.subnet_name
  virtual_network_name = data.azurerm_virtual_network.tf-vn.name
  resource_group_name  = module.resource_groups.external_rg_name
}

变量.tf

# Declare env variable
variable "vnet_name" {
  type = string
}

variable "subnet_name" {
  type = string
}

计算模块。

目的：定义计算（VM）的所有属性。这个想法是，根模块将使用这个模块来启动不同的虚拟机角色。

主文件

module "vm_iis" {
  source                        = "Azure/compute/azurerm"
  location                      = data.resourcegroup.tf-rg-external.location
  vnet_subnet_id                = data.network.tf-sn.id
  admin_password                = var.admin_password
  data_sa_type                  = var.data_sa_type
  delete_os_disk_on_termination = var.delete_os_disk_on_termination
  nb_instances                 = var.nb_instances
  nb_public_ip                 = var.nb_public_ip
  public_ip_address_allocation = var.public_ip_address_allocation
  resource_group_name          = data.resourcegroup.tf-rg-external.name
  .
  .
  .
}

变量.tf

variable "admin_password" {
  type = string
}
variable "admin_username" {
  type = string
}
variable "boot_diagnostics" {
  type = bool
}
variable "boot_diagnostics_sa_type" {
  type = string
}...

terraform根模块。

目的：这应该利用定义的模块来创建各种不同大小和主机名的 VM

主要.tf：

module "sql_vm" {
  source                        = "./modules/compute/"
  #location                      = data.resourcegroup.tf-rg-external.location
  #vnet_subnet_id                = data.network.tf-sn.id
  public_ip_address_allocation  = var.public_ip_address_allocation
  #resource_group_name          = data.resourcegroup.tf-rg-external.name
  storage_account_type          = var.storage_account_type
  vm_hostname                   = var.vm_hostname
}

variables.tf：声明main.tf文件中的所有变量。

注意：我有意在根模块主/变量文件中对变量进行了硬编码。这只是让模块之间的通信正确。理解和使用模块的正确方法。

但是，当我在根模块中运行 terraform plan 时。我收到以下错误：

Error: Reference to undeclared resource

  on modules/compute/main.tf line 3, in module "vm_iis":
   3:   location                      = data.resourcegroup.tf-rg-external.location

A data resource "resourcegroup" "tf-rg-external" has not been declared in
sql_vm.


Error: Reference to undeclared resource

  on modules/compute/main.tf line 4, in module "vm_iis":
   4:   vnet_subnet_id                = data.network.tf-sn.id

A data resource "network" "tf-sn" has not been declared in sql_vm.


Error: Reference to undeclared resource

  on modules/compute/main.tf line 22, in module "vm_iis":
  22:   resource_group_name          = data.resourcegroup.tf-rg-external.name

A data resource "resourcegroup" "tf-rg-external" has not been declared in
sql_vm.

这是什么问题以及如何解决？

另外，可以通过某个循环创建不同的（角色）虚拟机吗？例如 sql-vm、iis-vm、testvm、abcvm？将会改变的是它们的主机名和虚拟机大小。

==========

发布答案更改

==========

我更新了compute/main.tf和terraform/main.tf 中子网、资源组和位置的值， 如下所示：

location                      = module.resourcegroup.tf-rg-external-location
vnet_subnet_id                = module.network.subnet-id
resource_group_name           = module.resourcegroup.tf-rg-external-name

我在资源组和网络模块中的output.tf文件如下所示：

outputs.tf的网络模块

output "subnet-id" {
  value = "data.network.tf-sn.id"
}

outputs.tf的资源组模块

output "tf-rg-external-location" {
  value = data.resourcegroup.tf-rg-external.location
}
output "tf-rg-external-name" {
  value = data.resourcegroup.tf-rg-external.name
}

不幸的是，我仍然收到如下错误

Error: Unsupported argument

  on main.tf line 3, in module "sql_vm":
   3:   location                      = module.resourcegroup.tf-rg-external-location

An argument named "location" is not expected here.


Error: Unsupported argument

  on main.tf line 4, in module "sql_vm":
   4:   vnet_subnet_id                = module.network.subnet-id

An argument named "vnet_subnet_id" is not expected here.


Error: Unsupported argument

  on main.tf line 5, in module "sql_vm":
   5:   resource_group_name           = module.resourcegroup.tf-rg-external-name

An argument named "resource_group_name" is not expected here.

那么，看起来我们不应该在根模块中引用它们？

另外，它们的变量应该在哪里定义为根模块 variables.tf 文件，因为我相信您可以覆盖根模块中模块变量的值？

如果我显得愚蠢，请原谅我。我试图了解它在现实生活中是如何运作的。

在最后一次提交和公共回购后，错误如下

Error: Reference to undeclared module

  on main.tf line 3, in module "sql_vm":
   3:   location                      = module.resourcegroup.tf-rg-external-location

No module call named "resourcegroup" is declared in the root module.


Error: Reference to undeclared module

  on main.tf line 4, in module "sql_vm":
   4:   vnet_subnet_id                = module.network.subnet-id

No module call named "network" is declared in the root module.


Error: Reference to undeclared module

  on main.tf line 5, in module "sql_vm":
   5:   resource_group_name           = module.resourcegroup.tf-rg-external-name

No module call named "resourcegroup" is declared in the root module.


Error: Reference to undeclared module

  on modules/compute/main.tf line 3, in module "vm_iis":
   3:   location                      = module.resourcegroup.tf-rg-external-location

No module call named "resourcegroup" is declared in sql_vm.


Error: Reference to undeclared module

  on modules/compute/main.tf line 4, in module "vm_iis":
   4:   vnet_subnet_id                = module.network.subnet-id

No module call named "network" is declared in sql_vm.


Error: Reference to undeclared module

  on modules/compute/main.tf line 5, in module "vm_iis":
   5:   resource_group_name           = module.resourcegroup.tf-rg-external-name

No module call named "resourcegroup" is declared in sql_vm.


Error: Reference to undeclared module

  on modules/network/main.tf line 5, in data "azurerm_virtual_network" "tf-vn":
   5:   resource_group_name = module.resource_groups.external_rg_name

No module call named "resource_groups" is declared in test2.


Error: Reference to undeclared resource

  on modules/resourcegroup/outputs.tf line 2, in output "tf-rg-external-location":
   2:   value = data.resourcegroup.tf-rg-external.location

A data resource "resourcegroup" "tf-rg-external" has not been declared in
test1.


Error: Reference to undeclared resource

  on modules/resourcegroup/outputs.tf line 5, in output "tf-rg-external-name":
   5:   value = data.resourcegroup.tf-rg-external.name

A data resource "resourcegroup" "tf-rg-external" has not been declared in
test1.

Answer 1

浏览您正在处理的存储库（https://github.com/ameyaagashe/help_me_cross/tree/d7485d2a3db339723e9c7 ​​91e592b2f1dbc1f0788）。现在对我来说很有意义。

问题是，您将如何使用公共模块的想法与您自己创建的模块混合在一起。

事实上，您不需要设置任何模块来引用其他公共 terraform 注册表模块。

将子模块（模块/计算、模块/网络、模块/资源组）中的所有代码移动到顶部文件夹 ( <repo_root>/main.tf)。

比如（代码未经验证，仅供参考）

data "azurerm_resource_group" "tf-rg-external" {
  name = var.rg_name
}

data "azurerm_virtual_network" "tf-vn" {
  name                = var.vnet_name
  resource_group_name = var.rg_name
}

# Reference existing subnet
data "azurerm_subnet" "tf-sn" {
  name                 = var.subnet_name
  virtual_network_name = data.azurerm_virtual_network.tf-vn.name
  resource_group_name  = var.rg_name
}

module "sql_vm" {
  source                        = "Azure/compute/azurerm"
  location                      = data.azurerm_resource_group.tf-rg-external.location
  vnet_subnet_id                = data.azurerm_virtual_network.tf-vn.subnets
  resource_group_name           = data.azurerm_resource_group.tf-rg-external.name
  admin_password                = var.admin_password
  admin_username                = var.admin_username
  boot_diagnostics              = var.boot_diagnostics
  boot_diagnostics_sa_type      = var.boot_diagnostics_sa_type
  data_disk                     = var.data_disk
  data_disk_size_gb             = var.data_disk_size_gb
  data_sa_type                  = var.data_sa_type
  delete_os_disk_on_termination = var.delete_os_disk_on_termination
  enable_accelerated_networking = var.enable_accelerated_networking
  # flag is_windows_image is required only when you use a custom image to spin up a VM
  # is_windows_image
  # flag vm_os_id is required only when you are using custom image
  # you need to provide id of your custom image
  # vm_os_id
  nb_instances                 = var.nb_instances
  nb_public_ip                 = var.nb_public_ip
  public_ip_address_allocation = var.public_ip_address_allocation
  storage_account_type         = var.storage_account_type
  vm_hostname                  = var.vm_hostname
  vm_os_offer                  = var.vm_os_offer
  vm_os_publisher              = var.vm_os_publisher
  # vm_os_simple is to be used is you do not wish to specify offer, publisher and sku
  # vm_os_simple                  = UbuntuServer, WindowsServer, RHEL, openSUSE-Leap, CentOS, Debian, CoreOS and SLES
  vm_os_sku     = var.vm_os_sku
  vm_os_version = var.vm_os_version
  vm_size       = var.vm_size
}