Terraform 6.1 模块基础使用

> 一个案例

主模块a.tf 
```
provider "aws" {
  region     = "ap-southeast-1"
  shared_config_files      = ["/home/iac/.aws/config"]
  shared_credentials_files = ["/home/iac/.aws/credentials"]
}
provider "aws" {
  alias      = "aws2"
  region     = "us-west-1"
  shared_config_files      = ["/home/iac/.aws/config"]
  shared_credentials_files = ["/home/iac/.aws/credentials"]
}

module "module_abc" {
  source = "./modules/b"
  key_name = "abc"
  providers = {
    aws = aws.aws2        #默认provider
    aws.aws_a = aws.aws2  #指定provider
  }
}

resource "aws_key_pair" "father_key" {
  key_name   = "father_key_${module.module_abc.child_key_arn}"  #获得子模块output 
  public_key = "ssh-rsa xxx"
}
```
模块文件modules/b/b.tf
```
terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"                 #设置provider的条件，可选
      version = ">= 2.7.0"
      configuration_aliases = [ aws.aws_a ]     #定义需要的provider
    }
  }
}

provider "aws" {                                #本地也可以有自己的provider
  alias      = "aws_b"
  region     = "us-west-2"
  shared_config_files      = ["/home/iac/.aws/config"]
  shared_credentials_files = ["/home/iac/.aws/credentials"]
}

variable "key_name" {                           #配置input
  type = string
}

resource "aws_key_pair" "child_key" {
  key_name   = "child_key_${var.key_name}"
  public_key = "ssh-rsa xxx"
}

resource "aws_key_pair" "child_key_a" {
  key_name   = "child_key_a"
  public_key = "ssh-rsa xxx"
  provider   = aws.aws_a
}

resource "aws_key_pair" "child_key_b" {
  key_name   = "child_key_b"
  public_key = "ssh-rsa xxx"
  provider   = aws.aws_b
}

output "child_key_arn" {                        #配置output
  value = aws_key_pair.child_key.arn
}
```

乱读天书， 不求甚解

乱读天书，不求甚解