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terraform - 如何让 terragrunt 将 tfvars 文件读入依赖模块

问题描述

任何人都知道如何让 terragrunt 将 tfvars 文件读入依赖模块？如果我在根 terragrunt.hcl 中将所有 tf​​var 声明为输入，则一切正常，但当然我不能按环境自定义它们。我尝试添加extra_arguments块，但变量未在根模块中声明。它们在依赖模块中声明，我不想在两个地方都声明它们。

这是我的设置：

// terraform/terragrunt.hcl

terraform {
  extra_arguments "common_vars" {
    commands = ["plan", "apply"]
    arguments = [
      "-var-file=${find_in_parent_folders("account.tfvars")}",
      "-var-file=./terraform.tfvars"
    ]
  }
}

locals {
  environment_vars = read_terragrunt_config(find_in_parent_folders("account.hcl"))
  bucket = local.environment_vars.locals.bucket
}

remote_state {
  backend = "s3"
  generate = {
    path      = "backend.tf"
    if_exists = "overwrite_terragrunt"
  }

  config = {
    key    = "${path_relative_to_include()}/terraform.tfstate"
    region = "us-east-1"
    bucket = local.bucket
  }
}

dependencies {
  paths = ["../../../shared/services", "../../../shared/core"]
}

// terraform/accounts/dev/account.tfvars

aws_region = "us-east-1"

// terraform/accounts/dev/william/terraform.tfvars

aws_vpc_cidr = "10.1.0.0/16"

// terraform/accounts/dev/william/terragrunt.hcl

include {
  path = find_in_parent_folders()
}

这不起作用，因为变量值实际上并没有传递给依赖模块。当我试图运行一个 terragrunt 计划时，我得到了这个：

''' TERMINAL OUTPUT

$ terragrunt plan
No changes. Infrastructure is up-to-date.

This means that Terraform did not detect any differences between your
configuration and real physical resources that exist. As a result, no
actions need to be performed.

Warning: Value for undeclared variable
The root module does not declare a variable named
"aws_region" but a value was found in file
"/Users/williamjeffries/code/parachute/infrastructure/terraform/accounts/dev/account.tfvars".

To use this value, add a "variable" block to the configuration.
Using a variables file to set an undeclared variable is deprecated and will
become an error in a future release. If you wish to provide certain "global"
settings to all configurations in your organization, use TF_VAR_...
environment variables to set these instead.

实际上有 26 个这样的警告，我在这里只粘贴了一个，但你明白了。似乎应该有某种方法可以用 terragruntgenerate块解决这个问题，但我不确定如何。有任何想法吗？

标签： terraformhclterragruntterraform-template-file

解决方案

我一直在关注这里的文档，它建议具有目录结构：

live
├── prod
│   ├── app
│   │   └── terragrunt.hcl
│   ├── mysql
│   │   └── terragrunt.hcl
│   └── vpc
│       └── terragrunt.hcl
├── qa
│   ├── app
│   │   └── terragrunt.hcl
etc...

和

# content of qa/app/terragrunt.hcl
terraform {
  # Deploy version v0.0.3 in qa
  source = "git::git@github.com:foo/modules.git//app?ref=v0.0.3"
}

inputs = {
  # tfvars for qa
  instance_count = 3
  instance_type  = "t2.micro"
}

和

# content of prod/app/terragrunt.hcl
terraform {
  # Deploy version v0.0.3 in prod
  source = "git::git@github.com:foo/modules.git//app?ref=v0.0.3"
}

inputs = {
  # tfvars for prod
  instance_count = 20
  instance_type  = "t2.2xlarge"
}

然后源可以在同一个git repo中。即：只是应用程序目录。然后您可以通过不同的环境（甚至不同环境中的不同版本）自定义模块应用程序

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