Open-Source DevOps · cloudposse

atmos

Atmos is an open-source infrastructure orchestration tool that unifies Terraform, Helm, and Kubernetes deployments across environments. It provides DRY configuration management, built-in auth, secrets handling, and workflow automation to run infrastructure consistently on laptops, CI/CD, and AI agents.

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Source: GitHub — github.com/cloudposse/atmos

1.3k

GitHub stars

169

Forks

Primary language

Apache-2.0

License (OSI-approved)

Key facts

Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.

Field	Value
Repository	cloudposse/atmos
Owner	cloudposse
Primary language	Go
License	Apache-2.0 — OSI-approved
Stars	1.3k
Forks	169
Open issues	288
Latest release	v1.222.0 (2026-07-02)
Last updated	2026-07-08
Source	https://github.com/cloudposse/atmos

What atmos is

Written in Go, Atmos acts as a runtime for infrastructure-as-code that orchestrates Terraform, OpenTofu, Helmfile, and Kubernetes with hierarchical stack composition, vendoring, caching, and MCP agent integration. It generates backends/providers, detects affected components via Git awareness, and chains operations across dependencies.

Quickstart

Get the atmos source

Clone the repository and explore it locally.

terminalbash

1git clone https://github.com/cloudposse/atmos.git2cd atmos3# follow the project's README for install & configuration

Need it deployed, integrated, or customized instead? DEV.co ships production installs.

Best use cases

Multi-Account, Multi-Region Cloud Management

Organizations managing infrastructure across multiple AWS/Azure/GCP accounts and regions benefit from DRY stack inheritance, unified authentication, and coordinated apply/plan across all components without manual orchestration.

SaaS Multi-Tenant Infrastructure

Define a baseline tenant configuration once, then onboard new tenants purely through configuration reuse. Atmos eliminates copy-paste across tenant stacks while maintaining strict isolation and compliance guardrails.

Platform Engineering & Self-Service Infrastructure

Platform teams codify Terraform modules and deployment patterns as reusable components, expose them via CLI and AI-native interfaces, and enforce policies (OPA, JSON Schema) so product teams deploy safely without expertise in underlying tools.

Implementation considerations

Migration from existing Terraform structures requires refactoring into Atmos stacks and components; plan for iteration on inheritance and composition patterns to achieve DRY goals.
Team onboarding involves learning stack syntax, component registry, YAML functions, and local/CI dev loop parity; recommend hands-on workshop and documentation review before production rollout.
Toolchain auto-install (Terraform, OpenTofu, Helmfile versions) requires network access and disk space for downloads; validate in air-gapped environments early if applicable.
Authentication and secrets backend integration (1Password, Vault, SSM, etc.) requires setup per environment; no single auth does everything out-of-the-box.
Caching and provider mirroring reduce CI time but need initial configuration; validate bandwidth and storage costs for teams with many components or frequent refreshes.

When to avoid it — and what to weigh

Simple Single-Account, Single-Region Deployments — If your infrastructure is a single AWS account with one region and straightforward Terraform modules, Atmos's composition and orchestration overhead may not justify adoption. Terraform alone is simpler.
Team Unfamiliar with YAML Configuration Management — Atmos relies on hierarchical YAML stack definitions and Go templating. Teams accustomed to purely imperative tooling may find the declarative abstraction layer and inheritance model a learning curve.
Mature CI/CD Pipelines with Domain-Specific Workflows — If your organization has heavily customized Jenkins, GitLab CI, or GitHub Actions pipelines with domain logic, Atmos's opinionated workflow and step system may conflict or require significant rework.
Vendor Lock-in to Existing Terraform Wrapper Tools — Organizations already invested in Terragrunt, Spacelift, or similar wrappers may find migration friction and unclear ROI for switching to Atmos's orchestration model.

License & commercial use

Atmos is licensed under Apache License 2.0 (Apache-2.0), a permissive OSI-approved license that allows commercial use, modification, and distribution with attribution and no warranty.

Apache-2.0 explicitly permits commercial use. Verify that any proprietary custom commands, templates, or policy logic does not inadvertently become subject to open-source obligations. Consider licensing implications if vendoring private modules or extending Atmos in proprietary ways.

DEV.co evaluation signals

Editorial assessment — not user reviews. Directional, with an explicit confidence level.

Signal	Assessment
Maintenance	Active
Documentation	Strong
License clarity	Clear
Deployment complexity	Moderate
DEV.co fit	Strong
Assessment confidence	High

Security considerations

Atmos handles auth (SSO, OIDC, federation), secrets masking, and access to cloud credentials. Evaluate: (1) Auth backend configuration and credential rotation policies, (2) secrets masking effectiveness across all log channels (stdout, CI logs, remote stores), (3) RBAC and policy enforcement (OPA) to prevent unauthorized stack/component access, (4) supply-chain risk when vendoring dependencies (pinning and checksum verification reduce risk but do not eliminate it), (5) no claim to SOC2/HIPAA compliance found in data; verify against regulatory requirements before use in regulated environments.

Alternatives to consider

Terragrunt

Similar DRY principle for multi-account Terraform; lighter-weight but less integrated auth/secrets/workflow features. Suit if you want a minimal wrapper without composition or AI features.

Spacelift

SaaS platform for Terraform orchestration with built-in policy, audit, and CI/CD; suits teams wanting managed ops but introduces vendor lock-in and recurring costs. Atmos is open and self-hosted.

Pulumi

IaC in TypeScript, Python, Go, etc.; composition and reusability via libraries. Differs fundamentally: Pulumi is imperative/procedural code, Atmos is declarative YAML + composition. Choose based on team language preference and abstraction style.

Software development agency

Build on atmos with DEV.co software developers

Explore Atmos in your browser with GitHub Codespaces, review the atmos.tools documentation, and evaluate fit against your multi-account or multi-region needs. Start a pilot with one environment to validate stack design before enterprise rollout.

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atmos FAQ

Can Atmos manage infrastructure across multiple cloud providers (AWS, Azure, GCP)?

Yes. Atmos supports unified authentication (SSO, OIDC, federation) across AWS, Azure, and GCP, and can orchestrate Terraform modules targeting any cloud. You model stacks and components once and reuse across providers.

Do I have to use Terraform, or can Atmos work with other IaC tools?

Terraform and OpenTofu are primary targets. Helmfile, Kubernetes, Packer, Ansible, containers, and cloud emulators are supported as first-class workloads. Custom component types can plug in, but you are not forced to use only Terraform.

What is the learning curve, and how long to production?

Learning curve is moderate: YAML stack syntax, component registry, and inheritance patterns require 1–2 weeks for a team unfamiliar with config composition. Pilot deployment to one account/region typically takes 4–8 weeks; full rollout depends on scope and refactoring existing Terraform.

Is Atmos suitable for regulated industries (HIPAA, PCI, SOC2)?

Unknown whether Atmos itself is certified for regulated workloads. The tool supports policy enforcement (OPA), secrets masking, and audit hooks. Conduct a security review and verify secrets backend compliance (e.g., FIPS validation) before use in regulated environments.

Work with a software development agency

Need help beyond evaluating atmos? DEV.co is a software development agency offering software development services and web development for teams of every size. Our software developers and web developers build custom software, web applications, APIs, and open-source devops integrations — and maintain them long-term.

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