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https://github.com/MitocGroup/terraform-aws-landing-zone

Terraform Module for AWS Landing Zone
https://github.com/MitocGroup/terraform-aws-landing-zone

amazon amazon-web-services aws-landing-zone infrastructure infrastructure-as-code landing-zone multi-account terraform

Last synced: about 2 months ago
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Terraform Module for AWS Landing Zone

Host: GitHub
URL: https://github.com/MitocGroup/terraform-aws-landing-zone
Owner: MitocGroup
License: mpl-2.0
Created: 2019-04-23T13:24:44.000Z (over 5 years ago)
Default Branch: master
Last Pushed: 2020-02-20T19:30:10.000Z (over 4 years ago)
Last Synced: 2024-05-28T11:10:45.774Z (4 months ago)
Topics: amazon, amazon-web-services, aws-landing-zone, infrastructure, infrastructure-as-code, landing-zone, multi-account, terraform
Language: HCL
Homepage: https://registry.terraform.io/modules/MitocGroup/landing-zone/aws
Size: 1.33 MB
Stars: 174
Watchers: 15
Forks: 108
Open Issues: 11
Metadata Files:
- Readme: README.md
- Contributing: docs/CONTRIBUTING.md
- License: LICENSE.md
- Code of conduct: docs/CODE_OF_CONDUCT.md

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README

# terraform module `landing-zone`
[AWS Landing Zone](https://aws.amazon.com/solutions/aws-landing-zone/) is
a solution that helps customers more quickly set up a secure, multi-account
AWS environment based on AWS best practices. This repository contains
terraform module `landing_zone` that dynamically deploys components of
AWS Landing Zone solution based on input list of `.tfvars` files.

RELATED: [terraform module `landing_zone_reader`](https://github.com/MitocGroup/terraform-aws-landing-zone-reader)

> NOTE: Current implementation is fully compatible with terraform v0.12+.
Switch to branch `terraform_v0.11` if you still using terraform v0.11.x and below.

Quick Links: [How Does This Module Work](#how-does-this-module-work) | [What Components Are Available](#what-components-are-available) | [Why to Use This Solution](#why-to-use-this-solution)

## How Does This Module Work
Terraform module [landing_zone](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/modules/landing_zone)
is based on [standard module structure](https://www.terraform.io/docs/modules/index.html#standard-module-structure)
guidelines and contains the following folders:
* root folder - module's standard terraform configuration
* [components](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components) - yaml-based and terraform compatible configurations
* [examples](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/examples) - different ways to combine components as part of this module
* [modules](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/modules) - standalone, reusable and production-ready modules
* [tests](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/tests) - set of automated tests to use in CI/CD pipelines

This terraform module requires the following prerequisites / dependencies:
* [nodejs](https://www.nodejs.org) - referenced and validated [here](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/modules/landing_zone/main.tf#L11)
* [terrahub](https://www.npmjs.com/package/terrahub) - referenced and validated [here](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/modules/landing_zone/scripts/config.js#L48)

To get started, simply include `main.tf` into your terraform codebase:
```hcl
module "landing_zone" {
source = "MitocGroup/landing-zone/aws"
version = "0.2.5"
landing_zone_providers = var.landing_zone_providers
landing_zone_components = var.landing_zone_components
terraform_backend = var.terraform_backend
}
```
> NOTE: Make sure to include `variables.tf` and optionally `terraform.tfvars`

To simplify and make it easier to understand, we included default values in `terraform.tfvars`:
```hcl
landing_zone_providers = {
default = {
account_id = "123456789012"
region = "us-east-1"
}
[...]
}
landing_zone_components = {
landing_zone_vpc = "s3://terraform-aws-landing-zone/components/landing_zone_vpc/*.tfvars"
[...]
}
terraform_backend = {
backend = "local"
path = "/tmp/.terrahub/landing_zone"
}
```

> NOTE: Placeholder `[...]` from above is used to suggest that similar syntax can be added. Remove it or update in order to have valid HCL / terraform configuration.

This means that before you use this terraform module, you will need to:
1. Change `landing_zone_providers` to values that describe your AWS Organization account
* `default` reflects the default setup corresponding to AWS Organization account; add more providers by extending `landing_zone_providers` map with extra AWS accounts and/or AWS regions
* `account_id` reflects the AWS account used to deploy AWS resources; prevents provisioning AWS resources into wrong AWS account in case of valid AWS credentials
* `region` reflects the AWS region used to deploy AWS resources; create 2 different providers for the same AWS account, but different AWS regions
2. Change `landing_zone_components` to values that fit into your AWS Landing Zone use case
* each key from `landing_zone_components` map represents the name of the component from [this list of available components](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components)
* each value from `landing_zone_components` map represents the path to `.tfvars` file on S3 and/or local disk
* each `.tfvars` file must use HCL format; DO NOT USE other formats like JSON or YAML
3. Change `terraform_backend` to values that reflect your terraform backend where `.tfstate` files are stored (in `variables.tf` default parameter value is defined as `local`)

> NOTE: Terraform module `landing_zone` can have tens, hundreds or thousands of deployable components, but not all of them should be and will be deployed. At runtime, components that are not part of `landing_zone_components` variable will be ignored.

### More Examples
* [Terraform module for AWS Landing Zone (one component: AWS Organization)](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/examples/example_landing_zone_organization)
* [Terraform module for AWS Landing Zone (multiple components: S3, CodePipeline and CodeBuild)](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/examples/example_landing_zone_s3_and_codepipeline)
* [Terraform module for AWS Lambda function using AWS Landing Zone reader](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/examples/example_landing_zone_reader)

## What Components Are Available
AWS Landing Zone solution is defined by the following strategy:
1. [Multi-Account Structure](#multi-account-structure)
* AWS Organization Account
* Shared Services Account
* Log Archive Account
* Security Account
2. [Account Vending Machine](#account-vending-machine)
3. [User Access and Identity Management](#user-access-and-identity-management)
4. [Monitoring and Notifications](#monitoring-and-notifications)

> NOTE: Current implementation of this terraform module covers only Multi-Account Structure
components (work in progress).

### Multi-Account Structure
AWS Landing Zone Multi-Account Architecture

Based on the multi-account architecture, here below are currently available components:
1. [landing_zone_pipeline_s3_bucket](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_pipeline_s3_bucket/.terrahub.yml#L6)
2. [landing_zone_pipeline_artifact_s3_bucket](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_pipeline_artifact_s3_bucket/.terrahub.yml#L6)
3. [landing_zone_code_pipeline](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_code_pipeline/.terrahub.yml#L33)
4. [landing_zone_code_pipeline_role](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_code_pipeline_role/.terrahub.yml#L6)
5. [landing_zone_code_pipeline_role_policy](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_code_pipeline_role_policy/.terrahub.yml#L41)
6. [landing_zone_code_build](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_code_build/.terrahub.yml#L21)
7. [landing_zone_code_build_role](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_code_build_role/.terrahub.yml#L6)
8. [landing_zone_code_build_role_policy](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_code_build_role_policy/.terrahub.yml#L29)
9. [landing_zone_organization](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_organization/.terrahub.yml#L6)
10. [landing_zone_organization_policy](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_organization_policy/.terrahub.yml#L6)
11. [landing_zone_organization_policy_attachment](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_organization_policy_attachment/.terrahub.yml#L18)
12. [landing_zone_organization_accounts](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_organization_accounts/.terrahub.yml#L15)
13. [landing_zone_organization_unit](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_organization_unit/.terrahub.yml#L15)

### Account Vending Machine
AWS Landing Zone Account Vending Machine Architecture

Based on the account vending machine architecture, here below are currently available components:
1. Coming soon ...

### User Access and Identity Management
AWS Landing Zone User Access and Identity Management Architecture

Based on the user access architecture, here below are currently available components:
1. [landing_zone_iam_role](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_iam_role/.terrahub.yml#L9)
2. [landing_zone_iam_policy](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_iam_policy/.terrahub.yml#L9)
3. [landing_zone_iam_role_policy_attachment](https://github.com/MitocGroup/terraform-aws-landing-zone/tree/master/components/landing_zone_iam_role_policy_attachment/.terrahub.yml#L9)
4. landing_zone_sso
5. [landing_zone_directory_service_director](https://github.com/MitocGroup/terraform-aws-landing-zone/blob/master/components/landing_zone_directory_service_directory/.terrahub.yml#L24)

> NOTE: This solution is relying on cross-account role called `OrganizationAccountAccessRole`. Follow [this link](https://docs.aws.amazon.com/organizations/latest/userguide/orgs_manage_accounts_access.html#orgs_manage_accounts_create-cross-account-role) to learn more and/or create missing IAM role(s)...

### Monitoring and Notifications
AWS Landing Zone Monitoring and Notifications Architecture

Based on the notifications architecture, here below are currently available components:
1. Coming soon ...

## Why to Use This Solution

### No need for code changes
Terraform module for AWS Landing Zone solution is up to 10 lines of code that receives a list of `.tfvars` files as input variables which describe providers (to be read: AWS accounts and AWS regions) and configs (to be read: AWS resources)

### No need for code rewrites
This implementation engages microservices architecture, allowing any component to be replaced with another component (or multiple components)

### No need for hard-coded values
Existing AWS resources created by your team can be reused programmatically as read only values by other teams' terraform configurations

### No need to rebuild from scratch
Existing AWS resources in your current AWS account(s) can be imported and reused without downtime by this terraform module via `terraform import` command

### No need to exclude pieces of account(s) baseline
Some customers were avoiding in the past AWS Landing Zone because it doesn't support some kind of 3rd party SSO solution or 3rd party Logging solution. By using terraform, we can easily bring those solutions into AWS Landing Zone as a set of components and empower customers to continue using best practices of both worlds

### Additionally, this module helps enforce best practices
- By removing the need for access to AWS root account(s)
- By using IAM cross-account roles and/or STS temporary credentials
- By enabling centralized CloudTrail logs and cross-region replication of CloudTrail logs
- By empowering complex organizations to separate roles and responsibilities (e.g. InfoSec team can place explicit deny on IAM, VPC, SG and STS for other teams and/or other environments like production or pre-production)