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Created July 17, 2024 09:16
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atlantis.md from HariSekhon/Knowledge-Base repo: https://github.com/HariSekhon/Knowledge-Base
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atlantis.md

Atlantis

https://www.runatlantis.io/

Terraform pull request automation on GitHub using GitHub Actions.

  • interaction is through pull request comments
  • Atlantis comments on the PR with command prompts of what to type in comments (and even corrects you if you comment terraform instead of atlantis command)
  • runs the Terraform / Terragrunt plan automatically upon creation / commit changes to the PR including GitHub update from trunk
  • prints the plan output in PR comment
  • comment atlantis apply to respond for Atlantis to apply the changes
  • requires PR to be mergeable before it will honor atlantis apply comments
    • so your other PR checks must pass first
  • Terragrunt becomes more useful in this context to modularize code base to reduce blast radius of changes and have Atlantis do shorter plan and apply runs
atlantis plan # -d path/to/terragrunt/module/directory
atlantis apply

Do Not Merge Pull Requests Early

If you merge a pull request, Atlantis will refuse to operate apply it.

You will then need to revert the PR and raise it again.

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