astro
A tool for orchestrating multiple Terraform modules with declarative configuration, dependencies, and concurrent execution.
What is astro?
Astro is a command-line tool for orchestrating multiple Terraform executions as a single command. It manages complex infrastructure deployments by handling dependencies between modules, enabling concurrent operations, and supporting dynamic environments. It solves the problem of coordinating Terraform across multiple modules and configurations efficiently.
DevOps engineers and infrastructure teams managing large-scale Terraform deployments with multiple modules, environments, or regions.
Developers choose Astro for its declarative configuration, fast parallel execution, and safe upgrade workflows, reducing manual coordination and errors in multi-module Terraform projects.
Overview
Astro is a tool for managing multiple Terraform executions as a single command
Use Cases
Best For
- Orchestrating Terraform deployments across multiple modules with dependencies
- Managing infrastructure across dynamic environments (e.g., dev, staging, prod)
- Running concurrent Terraform plans or applies to speed up operations
- Safely upgrading Terraform versions and migrating state files
- Targeted deploys to specific environments or regions
- Automating AWS role assumption or other pre-execution hooks
Not Ideal For
- Projects with a single Terraform module and no cross-environment deployments
- Teams requiring production-grade stability and vendor support for critical infrastructure
- Organizations already invested in Terraform Cloud or similar managed orchestration platforms
Pros & Cons
Pros
Centralizes module definitions, dependencies, and variables in a single astro.yaml file, reducing manual coordination errors as shown in the example configuration.
Runs Terraform operations in parallel across modules and environments, speeding up deployments with output showing simultaneous plans for multiple executions.
Automatically downloads and switches Terraform versions with state file migration support, allowing easy upgrades by changing the version in config.
Supports variable permutations for multiple environments (e.g., dev, prod) out of the box, enabling flexible deployments without custom scripting.
Cons
The README explicitly states Astro is experimental, meaning it may have bugs, breaking changes, or lack long-term support, unsuitable for production use.
Requires Go installation or binary management, and adds YAML configuration layer, increasing complexity compared to native Terraform workflows.
As a newer tool from Uber, it has fewer integrations, community plugins, and documented best practices than established alternatives like Terragrunt.
Frequently Asked Questions
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