Terraforming

Project Status (2021-12-11): No longer actively maintained

Terraforming is no longer actively maintained.

If you want to generate Terraform configurations from existing cloud resources, consider using other tools, such as

Terraformer which supports many cloud providers not only AWS but also GCP, Azure, GitHub, Kubernetes, etc., and is able to generate configurations based on the latest provider's resource schema.
Terracognita

Thank you for your contributions and supports in the past 6 years.

Export existing AWS resources to Terraform style (tf, tfstate)

Supported version
Installation
Prerequisites
Usage
Run as Docker container
Development
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Supported version

Ruby 2.3 or higher is required
Terraform v0.9.3 or higher is recommended
- Some resources (e.g. iam_instance_profile) uses newer resource specification

Installation

Add this line to your application's Gemfile:

gem 'terraforming'

And then execute:

$ bundle

Or install it yourself as:

$ gem install terraforming

Prerequisites

You need to set AWS credentials.

export AWS_ACCESS_KEY_ID=XXXXXXXXXXXXXXXXXXXX
export AWS_SECRET_ACCESS_KEY=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
export AWS_REGION=xx-yyyy-0

You can also specify credential profile in ~/.aws/credentials by --profile option.

$ cat ~/.aws/credentials
[hoge]
aws_access_key_id = Hoge
aws_secret_access_key = FugaFuga

# Pass profile name by --profile option
$ terraforming s3 --profile hoge

You can assume a role by using the --assume option.

$ terraforming s3 --assume arn:aws:iam::123456789123:role/test-role

You can force the AWS SDK to utilize the CA certificate that is bundled with the SDK for systems where the default OpenSSL certificate is not installed (e.g. Windows) by utilizing the --use-bundled-cert option.

PS C:\> terraforming ec2 --use-bundled-cert

Usage

$ terraforming
Commands:
  terraforming alb             # ALB
  terraforming asg             # AutoScaling Group
  terraforming cwa             # CloudWatch Alarm
  terraforming dbpg            # Database Parameter Group
  terraforming dbsg            # Database Security Group
  terraforming dbsn            # Database Subnet Group
  terraforming ddb             # DynamoDB
  terraforming ec2             # EC2
  terraforming ecc             # ElastiCache Cluster
  terraforming ecsn            # ElastiCache Subnet Group
  terraforming efs             # EFS File System
  terraforming eip             # EIP
  terraforming elb             # ELB
  terraforming help [COMMAND]  # Describe available commands or one specific command
  terraforming iamg            # IAM Group
  terraforming iamgm           # IAM Group Membership
  terraforming iamgp           # IAM Group Policy
  terraforming iamip           # IAM Instance Profile
  terraforming iamp            # IAM Policy
  terraforming iampa           # IAM Policy Attachment
  terraforming iamr            # IAM Role
  terraforming iamrp           # IAM Role Policy
  terraforming iamu            # IAM User
  terraforming iamup           # IAM User Policy
  terraforming igw             # Internet Gateway
  terraforming kmsa            # KMS Key Alias
  terraforming kmsk            # KMS Key
  terraforming lc              # Launch Configuration
  terraforming nacl            # Network ACL
  terraforming nat             # NAT Gateway
  terraforming nif             # Network Interface
  terraforming r53r            # Route53 Record
  terraforming r53z            # Route53 Hosted Zone
  terraforming rds             # RDS
  terraforming rs              # Redshift
  terraforming rt              # Route Table
  terraforming rta             # Route Table Association
  terraforming s3              # S3
  terraforming sg              # Security Group
  terraforming sn              # Subnet
  terraforming snst            # SNS Topic
  terraforming snss            # SNS Subscription
  terraforming sqs             # SQS
  terraforming vgw             # VPN Gateway
  terraforming vpc             # VPC

Options:
  [--merge=MERGE]                                # tfstate file to merge
  [--overwrite], [--no-overwrite]                # Overwrite existng tfstate
  [--tfstate], [--no-tfstate]                    # Generate tfstate
  [--profile=PROFILE]                            # AWS credentials profile
  [--region=REGION]                              # AWS region
  [--use-bundled-cert], [--no-use-bundled-cert]  # Use the bundled CA certificate from AWS SDK

Export tf

$ terraforming <resource> [--profile PROFILE]

(e.g. S3 buckets):

$ terraforming s3

resource "aws_s3_bucket" "hoge" {
    bucket = "hoge"
    acl    = "private"
}

resource "aws_s3_bucket" "fuga" {
    bucket = "fuga"
    acl    = "private"
}

Export tfstate

$ terraforming <resource> --tfstate [--merge TFSTATE_PATH] [--overwrite] [--profile PROFILE]

(e.g. S3 buckets):

$ terraforming s3 --tfstate

{
  "version": 1,
  "serial": 1,
  "modules": {
    "path": [
      "root"
    ],
    "outputs": {
    },
    "resources": {
      "aws_s3_bucket.hoge": {
        "type": "aws_s3_bucket",
        "primary": {
          "id": "hoge",
          "attributes": {
            "acl": "private",
            "bucket": "hoge",
            "id": "hoge"
          }
        }
      },
      "aws_s3_bucket.fuga": {
        "type": "aws_s3_bucket",
        "primary": {
          "id": "fuga",
          "attributes": {
            "acl": "private",
            "bucket": "fuga",
            "id": "fuga"
          }
        }
      }
    }
  }
}

If you want to merge exported tfstate to existing terraform.tfstate, specify --tfstate --merge=/path/to/terraform.tfstate option. You can overwrite existing terraform.tfstate by specifying --overwrite option together.

Existing terraform.tfstate:

# /path/to/terraform.tfstate

{
  "version": 1,
  "serial": 88,
  "remote": {
    "type": "s3",
    "config": {
      "bucket": "terraforming-tfstate",
      "key": "tf"
    }
  },
  "modules": {
    "path": [
      "root"
    ],
    "outputs": {
    },
    "resources": {
      "aws_elb.hogehoge": {
        "type": "aws_elb",
        "primary": {
          "id": "hogehoge",
          "attributes": {
            "availability_zones.#": "2",
            "connection_draining": "true",
            "connection_draining_timeout": "300",
            "cross_zone_load_balancing": "true",
            "dns_name": "hoge-12345678.ap-northeast-1.elb.amazonaws.com",
            "health_check.#": "1",
            "id": "hogehoge",
            "idle_timeout": "60",
            "instances.#": "1",
            "listener.#": "1",
            "name": "hoge",
            "security_groups.#": "2",
            "source_security_group": "default",
            "subnets.#": "2"
          }
        }
      }
    }
  }
}

To generate merged tfstate:

$ terraforming s3 --tfstate --merge=/path/to/tfstate

{
  "version": 1,
  "serial": 89,
  "remote": {
    "type": "s3",
    "config": {
      "bucket": "terraforming-tfstate",
      "key": "tf"
    }
  },
  "modules": {
    "path": [
      "root"
    ],
    "outputs": {
    },
    "resources": {
      "aws_elb.hogehoge": {
        "type": "aws_elb",
        "primary": {
          "id": "hogehoge",
          "attributes": {
            "availability_zones.#": "2",
            "connection_draining": "true",
            "connection_draining_timeout": "300",
            "cross_zone_load_balancing": "true",
            "dns_name": "hoge-12345678.ap-northeast-1.elb.amazonaws.com",
            "health_check.#": "1",
            "id": "hogehoge",
            "idle_timeout": "60",
            "instances.#": "1",
            "listener.#": "1",
            "name": "hoge",
            "security_groups.#": "2",
            "source_security_group": "default",
            "subnets.#": "2"
          }
        }
      },
      "aws_s3_bucket.hoge": {
        "type": "aws_s3_bucket",
        "primary": {
          "id": "hoge",
          "attributes": {
            "acl": "private",
            "bucket": "hoge",
            "id": "hoge"
          }
        }
      },
      "aws_s3_bucket.fuga": {
        "type": "aws_s3_bucket",
        "primary": {
          "id": "fuga",
          "attributes": {
            "acl": "private",
            "bucket": "fuga",
            "id": "fuga"
          }
        }
      }
    }
  }
}

After writing exported tf and tfstate to files, execute terraform plan and check the result. There should be no diff.

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

Terraforming

Install / Use

README

Terraforming

Project Status (2021-12-11): No longer actively maintained

Supported version

Installation

Prerequisites

Usage

Export tf

Export tfstate