https://github.com/uber/astro

Astro is a tool for managing multiple Terraform executions as a single command

---

terraform:
  version: 0.11.7

hooks:
  startup:
    - command: assume-role --role terraform
      set_env: true

modules:
  - name: app
    path: core/app
    deps:
      - module: users
      - module: vpc
    remote:
      backend_config:
        bucket: acme-terraform-states
        key: "{{.aws_region}}/app-{{.environment}}.tfstate"
        region: us-east-1
    variables:
      - name: region
      - name: environment
        values: [dev, prod]

  - name: database
    path: core/database
    remote:
      backend_config:
        bucket: acme-terraform-states
        key: "{{.aws_region}}/database-{{.environment}}.tfstate"
        region: us-east-1
    variables:
      - name: region
      - name: environment
        values: [dev, prod]

  - name: mgmt
    path: core/mgmt
    deps:
      - module: vpc
        variables:
          environment: mgmt  # depends on vpc/mgmt
    remote:
      backend_config:
        bucket: acme-terraform-states
        key: "{{.aws_region}}/mgmt-{{.environment}}.tfstate"
        region: us-east-1
    variables:
      - name: region

  - name: users
    path: core/users
    remote:
      backend_config:
        bucket: acme-terraform-states
        key: global/users
        region: us-east-1

  - name: vpc
    path: core/vpc
    remote:
      backend_config:
        bucket: acme-terraform-states
        key: "{{.aws_region}}/vpc-{{.environment}}.tfstate"
        region: us-east-1
    variables:
      - name: region
      - name: environment
        values: [mgmt, dev, prod]