使用 Terragrunt 从一个 Terraform 模块创建多个对象

Question

我正在通过 terragrunt 使用 terraform。 我有一个文件夹，里面有一个 terragrunt.hcl 文件。该文件的目的是在 GCP 中创建多个子网。

为了创建子网，我有一个模块，它接受多个输入。

我希望能够在我的 terragrunt.hcl 文件中创建多个子网。

我认为最好的方法是创建一个包含字典的列表（或 terraform 所称的地图），然后对其进行迭代。

我有一些代码不工作

这是一些无效的代码。

#terragrunt.hcl

include {
  path = find_in_parent_folders()
}

  inputs = {
    # Common tags to be assigned to all resources
    subnetworks = [
      {
        "subnetName": "subnet1-euw"
        "subNetwork": "10.2.0.0/16"
        "region": "europe-west1"
      },
      {
        "subnetName": "subnet1-usc1"
        "subNetwork": "10.3.0.0/16"
        "region": "us-central1"
      }
    ]
  }

terraform {
  module "subnetworks" {
    source = "github.com/MyProject/infrastructure-modules.git//vpc/subnetwork"
    vpc_name = "MyVPC"
    vpc_subnetwork_name = [for network in subnetworks: network.subnetName]
    vpc_subnetwork_cidr = [for network in subnetworks: network.subNetwork]
    vpc_subnetwork_region = [for network in subnetworks: network.region]
  }
}

似乎我不能在“terraform”块内使用“模块”。希望代码至少显示了我想要实现的目标。

作为参考，我调用的模块如下所示

#main.tf

terraform {
  # Intentionally empty. Will be filled by Terragrunt.
  backend "gcs" {}
}

resource "google_compute_subnetwork" "vpc_subnetwork" {
  name          = var.vpc_subnetwork_name
  ip_cidr_range = var.vpc_subnetwork_cidr
  region        = var.vpc_subnetwork_region
  network       = var.vpc_name
}

#variables.tf
variable "vpc_name" {
  description = "Name of VPC"
  type        = string
}

variable "vpc_subnetwork_name" {
  description = "Name of subnetwork"
  type        = string
}

variable "vpc_subnetwork_cidr" {
  description = "Subnetwork CIDR"
  type        = string
}

variable "vpc_subnetwork_region" {
  description = "Subnetwork region"
  type        = string
}

Answer 1

Terragrunt 没有循环结构。在 Terragrunt 中，您将使用目录层次结构来做您想做的事情。例如，要实现上述目标，如下所示：

└── live
    ├── empty.yaml
    ├── euw
    │   ├── region.yaml
    │   └── vpc
    │       └── terragrunt.hcl
    ├── terragrunt.hcl
    └── usc1
        ├── region.yaml
        └── vpc
            └── terragrunt.hcl

在live/terragrunt.hcl 中，您可以在 terragrunt 配置中使用其他 yaml 文件：

# live/terragrunt.hcl
inputs = merge(
  # Configure Terragrunt to use common vars encoded as yaml to help you keep often-repeated variables (e.g., account ID)
  # DRY. We use yamldecode to merge the maps into the inputs, as opposed to using varfiles due to a restriction in
  # Terraform >=0.12 that all vars must be defined as variable blocks in modules. Terragrunt inputs are not affected by
  # this restriction.
  yamldecode(
    file("${get_terragrunt_dir()}/${find_in_parent_folders("region.yaml", "${path_relative_from_include()}/empty.yaml")}"),
  )
)

在每个区域内的region.yaml 中，您只需说明该区域：

# live/euw/region.yaml
# These variables apply to this entire region. They are automatically pulled in using the extra_arguments
# setting in the root terraform.tfvars file's Terragrunt configuration.
region: "europe-west1"

# live/usc1/region.yaml
region: "us-central1"

现在您可以将每个区域 terragrunt.hcl 文件中的区域作为变量引用：

# live/euw/vpc/terragrunt.hcl
terraform {
  source = "github.com/MyProject/infrastructure-modules.git//vpc/subnetwork"
}

include {
  path = find_in_parent_folders()
}

inputs = {
  vpc_subnetwork_name = "subnet1-${region}"
  vpc_subnetwork_cidr = "10.2.0.0/16"
  vpc_subnetwork_region = region
  vpc_name = "MyVPC"
}

还有：

# live/usc1/vpc/terragrunt.hcl
terraform {
  source = "github.com/MyProject/infrastructure-modules.git//vpc/subnetwork"
}

include {
  path = find_in_parent_folders()
}

inputs = {
  vpc_subnetwork_name = "subnet1-${region}"
  vpc_subnetwork_cidr = "10.3.0.0/16"
  vpc_subnetwork_region = region
  vpc_name = "MyVPC"
}

您可能会发现来自 Gruntwork 的 example terragrunt repository 很有帮助。