---
title: "GitHub Integration"
---

# GitHub Integration

GitHub can be used to import Terraform configuration, automatically queuing
runs when changes are merged into a repository's default branch. Additionally,
plans are run when a pull request is created or updated. Atlas will update the
pull request with the result of the Terraform plan providing quick feedback on
proposed changes.

## Setup

Atlas environments are linked to individual GitHub repositories. However, a
single GitHub repository can be linked to multiple Atlas environments allowing
a single set of Terraform configuration to be used across multiple environments.

Atlas environments can be linked when they're initially created using the
[New Environment](https://atlas.hashicorp.com/configurations/import) process.
Existing environments can be linked by setting GitHub details in their
**Integrations**.

To link an Atlas environment to a GitHub repository, you need three pieces of
information:

- **GitHub repository** - The location of the repository being imported in the
format _username/repository_.
- **GitHub branch** - The branch from which to ingress new versions. This
defaults to the value GitHub provides as the default branch for this repository.
- **Path to directory of Terraform files** - The repository's subdirectory that
contains its terraform files. This defaults to the root of the repository.