koji - RPM building and tracking system

Koji is an RPM-based build system. The Fedora Project uses Koji for their build system, as do several other projects.

Koji's goal is to provide a flexible, secure, and reproducible way to build software.

Key features:

  • New buildroot for each build
  • Robust XML-RPC APIs for easy integration with other tools
  • Web interface with SSL and Kerberos authentication
  • Thin, portable command line client
  • Users can create local buildroots
  • Buildroot contents are tracked in the database
  • Versioned data



If you have found a bug or would like to request a new feature, please report an issue in Pagure.


The koji source code can be downloaded with git via:

git clone

You may browse code at

Archived releases can be found at



Related Software

  • Mock: The tool Koji uses to generate buildroots
  • Yum
  • Mash
  • Koji Tools: Various utilities for Koji
  • Kojiji: Koji Java Interface
  • txkoji: Async interface to Koji, using Twisted