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Provision an S3 bucket to store terraform.tfstate file and a DynamoDB table to lock the state file to prevent concurrent modifications and state corruption

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README Header

Cloud Posse

terraform-aws-tfstate-backend Build Status Latest Release Slack Community

Terraform module to provision an S3 bucket to store terraform.tfstate file and a DynamoDB table to lock the state file to prevent concurrent modifications and state corruption.

The module supports the following:

  1. Forced server-side encryption at rest for the S3 bucket
  2. S3 bucket versioning to allow for Terraform state recovery in the case of accidental deletions and human errors
  3. State locking and consistency checking via DynamoDB table to prevent concurrent operations
  4. DynamoDB server-side encryption

https://www.terraform.io/docs/backends/types/s3.html

NOTE: The operators of the module (IAM Users) must have permissions to create S3 buckets and DynamoDB tables when performing terraform plan and terraform apply

NOTE: This module cannot be used to apply changes to the mfa_delete feature of the bucket. Changes regarding mfa_delete can only be made manually using the root credentials with MFA of the AWS Account where the bucket resides. Please see: hashicorp/terraform-provider-aws#62


This project is part of our comprehensive "SweetOps" approach towards DevOps.

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Usage

terraform {
  required_version = ">= 0.11.3"
}

module "terraform_state_backend" {
  source        = "git::https://github.com/cloudposse/terraform-aws-tfstate-backend.git?ref=master"
  namespace     = "cp"
  stage         = "prod"
  name          = "terraform"
  attributes    = ["state"]
  region        = "us-east-1"
}

NOTE: First create the bucket and table without any state enabled (Terraform will use the local file system to store state). You can then import the bucket and table by using terraform import and store the state file into the bucket.

Once the bucket and table have been created, configure the backend

terraform {
  required_version = ">= 0.11.3"
  
  backend "s3" {
    region         = "us-east-1"
    bucket         = "< the name of the S3 bucket >"
    key            = "terraform.tfstate"
    dynamodb_table = "< the name of the DynamoDB table >"
    encrypt        = true
  }
}

module "another_module" {
  source = "....."
}

Initialize the backend with terraform init.

After terraform apply, terraform.tfstate file will be stored in the bucket, and the DynamoDB table will be used to lock the state to prevent concurrent modifications.


s3-bucket-with-terraform-state

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Inputs

Name Description Type Default Required
acl The canned ACL to apply to the S3 bucket string private no
additional_tag_map Additional tags for appending to each tag map map <map> no
attributes Additional attributes (e.g. state) list <list> no
context Default context to use for passing state between label invocations map <map> no
delimiter Delimiter to be used between namespace, environment, stage, name and attributes string - no
enable_server_side_encryption Enable DynamoDB server-side encryption string true no
environment Environment, e.g. 'prod', 'staging', 'dev', 'pre-prod', 'UAT' string `` no
force_destroy A boolean that indicates the S3 bucket can be destroyed even if it contains objects. These objects are not recoverable string false no
label_order The naming order of the id output and Name tag list <list> no
mfa_delete A boolean that indicates that versions of S3 objects can only be deleted with MFA. ( Terraform cannot apply changes of this value; hashicorp/terraform-provider-aws#629 ) string false no
name Solution name, e.g. 'app' or 'jenkins' string terraform no
namespace Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp' string `` no
read_capacity DynamoDB read capacity units string 5 no
region AWS Region the S3 bucket should reside in string - yes
stage Stage, e.g. 'prod', 'staging', 'dev', OR 'source', 'build', 'test', 'deploy', 'release' string `` no
tags Additional tags (e.g. map('BusinessUnit','XYZ') map <map> no
write_capacity DynamoDB write capacity units string 5 no

Outputs

Name Description
dynamodb_table_arn DynamoDB table ARN
dynamodb_table_id DynamoDB table ID
dynamodb_table_name DynamoDB table name
s3_bucket_arn S3 bucket ARN
s3_bucket_domain_name S3 bucket domain name
s3_bucket_id S3 bucket ID

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Copyright

Copyright © 2017-2018 Cloud Posse, LLC

License

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
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Contributors

Andriy Knysh
Andriy Knysh
Erik Osterman
Erik Osterman
Maarten van der Hoef
Maarten van der Hoef

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Provision an S3 bucket to store terraform.tfstate file and a DynamoDB table to lock the state file to prevent concurrent modifications and state corruption

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