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Concourse is a pipeline-based CI system written in Go.


Concourse is built on a few components, all written in Go with cutesy aerospace-themed names. This repository is actually its BOSH release, which ties everything together and also serves as the central hub for GitHub issues.

Each component has its own repository:

  • ATC is most of Concourse: it provides the API, web UI, and all pipeline orchestration
  • Fly is the CLI for interacting with and configuring Concourse pipelines
  • TSA is a SSH server used for authorizing worker registration
  • Garden is a generic interface for orchestrating containers remotely on a worker
  • Baggageclaim is a server for managing caches and artifacts on the workers

To learn more about how they fit together, see Concourse Architecture.