Concourse CI

Open-source continuous integration and delivery system centered on declarative pipelines. Built around resources, tasks, and jobs, it delivers a versatile approach to automation that excels at CI/CD while staying lean and portable.

Sponsored by Cloud Foundry, Pix4D, SAP, and RamNode. Differs from Jenkins and GitHub Actions by treating pipelines as distributed Makefiles, with no built-in knowledge of git or external systems. Instead, resource types defined in the pipeline itself model external state, keeping pipelines self-contained and easy to migrate or recover.

Key capabilities:

• Code-based pipeline configuration in YAML, managed and versioned via the fly CLI
• Container-based execution where every task specifies its own image, avoiding worker-side package management
• fly intercept for direct access into build containers to debug failing jobs
• fly execute for running pipeline tasks locally or reproducing failed builds with modified inputs
• Resource abstraction for integrating any external system without a complex plugin model

Teams use Concourse for build, test, and deploy automation across source repos, artifacts, and deployments. The visual pipeline UI shows dependency flows at a glance, and the fly CLI enables source-controlling all CI configuration so pipelines travel with the project.