Terraformer란?

Overview

오늘은 Terraformer에 대해서 공부해보려고 한다.

https://github.com/GoogleCloudPlatform/terraformer

 

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Terraformer란?

기존의 생성되어있는 인프라를 테라폼 소스로 가져오는 오픈소스 툴이다.

그리고 Terraformer는 GCP를 위해 만들어진 툴이다. Waze SRE에서 만들었으며 공식적인 제품은 아니다.

 

Terraformer 가지고 있는 AWS 리소스는 아래 링크와 같다.

• https://github.com/GoogleCloudPlatform/terraformer/blob/master/docs/aws.md

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Terraformer 설치 및 Import Resource

저는 Window를 사용중이고 그 위에 WSL을 설치하여 사용중입니다.

따라서 제가 알려드리는 설치과정은 Linux기준입니다.

 

Terraformer 다운로드

export PROVIDER={all,google,aws,kubernetes}
curl -LO https://github.com/GoogleCloudPlatform/terraformer/releases/download/$(curl -s https://api.github.com/repos/GoogleCloudPlatform/terraformer/releases/latest | grep tag_name | cut -d '"' -f 4)/terraformer-${PROVIDER}-linux-amd64
chmod +x terraformer-${PROVIDER}-linux-amd64
sudo mv terraformer-${PROVIDER}-linux-amd64 /usr/local/bin/terraformer

export PROVIDER=aws
curl -LO https://github.com/GoogleCloudPlatform/terraformer/releases/download/$(curl -s https://api.github.com/repos/GoogleCloudPlatform/terraformer/releases/latest | grep tag_name | cut -d '"' -f 4)/terraformer-${PROVIDER}-linux-amd64
chmod +x terraformer-${PROVIDER}-linux-amd64
sudo mv terraformer-${PROVIDER}-linux-amd64 /usr/local/bin/terraformer

export PROVIDER=google
curl -LO https://github.com/GoogleCloudPlatform/terraformer/releases/download/$(curl -s https://api.github.com/repos/GoogleCloudPlatform/terraformer/releases/latest | grep tag_name | cut -d '"' -f 4)/terraformer-${PROVIDER}-linux-amd64
chmod +x terraformer-${PROVIDER}-linux-amd64
sudo mv terraformer-${PROVIDER}-linux-amd64 /usr/local/bin/terraformer

 

AWS

$ terraformer import
Import current state to Terraform configuration

Usage:
   import [command]

Available Commands:
  aws         Import current state to Terraform configuration from AWS
  plan        Import planned state to Terraform configuration

Flags:
  -h, --help   help for import

Additional help topics:
   import no-sort Don't sort resources

Use " import [command] --help" for more information about a command.

 

GCP

$ terraformer import
Import current state to Terraform configuration

Usage:
   import [command]

Available Commands:
  google      Import current state to Terraform configuration from Google Cloud
  plan        Import planned state to Terraform configuration

Flags:
  -h, --help   help for import

Additional help topics:
   import no-sort Don't sort resources

Use " import [command] --help" for more information about a command.

 

Provider 다운로드

$ curl -LO https://releases.hashicorp.com/terraform-provider-aws/4.64.0/terraform-provider-aws_4.64.0_linux_amd64.zip
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 76.3M  100 76.3M    0     0  99.0M      0 --:--:-- --:--:-- --:--:-- 98.9M

$ mkdir -p ~/.terraform.d/plugins/linux_amd64

$ mv terraform-provider-aws_4.64.0_linux_amd64.zip ~/.terraform.d/plugins/linux_amd64/

$ cd .terraform.d/plugins/linux_amd64/

~/.terraform.d/plugins/linux_amd64$ unzip terraform-provider-aws_4.64.0_linux_amd64.zip
Archive:  terraform-provider-aws_4.64.0_linux_amd64.zip
  inflating: terraform-provider-aws_v4.64.0_x5

 

Terraformer Import Resource

Import를 하면 generated 디렉토리 안에 리소스들이 생성된다. 

$ terraformer import aws --resources=* --path-pattern="{output}/" --connect=true --regions=ap-northeast-2 --profile luxon
2023/04/27 16:48:53 aws importing region ap-northeast-2
2023/04/27 16:48:53 aws importing... vpc
2023/04/27 16:48:53 aws done importing vpc
2023/04/27 16:48:53 aws importing... subnet
2023/04/27 16:48:53 aws done importing subnet
2023/04/27 16:48:53 aws importing... route_table
2023/04/27 16:48:53 aws done importing route_table
2023/04/27 16:48:53 aws importing... igw
2023/04/27 16:48:53 aws done importing igw
2023/04/27 16:48:53 aws importing... sg
2023/04/27 16:48:53 aws done importing sg
2023/04/27 16:48:53 aws importing... nat
2023/04/27 16:48:54 aws done importing nat
2023/04/27 16:48:54 Number of resources for service sg: 26
2023/04/27 16:48:54 Number of resources for service nat: 5
2023/04/27 16:48:54 Number of resources for service vpc: 4
2023/04/27 16:48:54 Number of resources for service subnet: 26
2023/04/27 16:48:54 Number of resources for service route_table: 42
2023/04/27 16:48:54 Number of resources for service igw: 4
...
$ ls
acm_certificate.tf          docdb_cluster_instance.tf         elasticache_replication_group.tf  iam_user_policy_attachment.tf    opsworks_user_profile.tf       s3_bucket_policy.tf
cloudformation_stack.tf     docdb_cluster_parameter_group.tf  elasticache_subnet_group.tf       instance.tf                      organizations_account.tf       secretsmanager_secret.tf
cloudfront_distribution.tf  docdb_subnet_group.tf             iam_group.tf                      internet_gateway.tf              organizations_organization.tf  security_group.tf
cloudwatch_dashboard.tf     dynamodb_table.tf                 iam_group_policy_attachment.tf    lb.tf                            outputs.tf                     subnet.tf
cloudwatch_event_rule.tf    ecr_repository.tf                 iam_instance_profile.tf           lb_listener.tf                   provider.tf                    terraform.tfstate
cloudwatch_event_target.tf  efs_file_system.tf                iam_policy.tf                     lb_listener_rule.tf              rds_cluster.tf                 variables.tf
cloudwatch_log_group.tf     efs_file_system_policy.tf         iam_role.tf                       lb_target_group.tf               resourcegroups_group.tf        vpc.tf
cloudwatch_metric_alarm.tf  efs_mount_target.tf               iam_role_policy.tf                lb_target_group_attachment.tf    route53_record.tf
db_instance.tf              eip.tf                            iam_role_policy_attachment.tf     main_route_table_association.tf  route53_zone.tf
db_parameter_group.tf       eks_cluster.tf                    iam_user.tf                       nat_gateway.tf                   route_table.tf
db_subnet_group.tf          elasticache_cluster.tf            iam_user_group_membership.tf      network_acl.tf                   route_table_association.tf
docdb_cluster.tf            elasticache_parameter_group.tf    iam_user_policy.tf                network_interface.tf

 

Provider.tf 수정 

$ cat provider.tf
provider "aws" {
  region = "ap-northeast-2"
  profile                  = "<profile>"
  shared_config_files      = ["~/.aws/config"]
  shared_credentials_files = ["~/.aws/credentials"]
}


terraform {
        required_providers {
                aws = {
            version = "~> 4.64.0"
                }
  }
}

 

 

.tfstate를 aws 형식으로 변경

terraformer로 생성된 provider에는 shared_config_files, shared_credentials_files 옵션이 없기 때문에 terraform init&plan이 불가능하기 때문에 꼭 필요한 작업이다.

$ terraform state replace-provider -auto-approve -- -/aws hashicorp/aws
Terraform will perform the following actions:

  ~ Updating provider:
    - registry.terraform.io/-/aws
    + registry.terraform.io/hashicorp/aws

Changing 107 resources:

 

$ cat iam_user.tf
resource "aws_iam_user" "tfer--AIDAXYWB7XLZF5D4TG2XB" {
  force_destroy = "false"
  name          = "administrator"
  path          = "/"
}

resource "aws_iam_user" "tfer--AIDAXYWB7XLZG3EP2YD3J" {
  force_destroy = "false"
  name          = "github-action"
  path          = "/"
}

 

 

 

 

 

 

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Reference

 

terraformer github URL