LinuxCon Europe + CloudOpen Europe

The OpenStack CI team developed Zuul to manage its project gating system. Gating is a process where every change, after passing code review, is automatically tested and merged only if it passes the test suite. Zuul is a flexible, general purpose system to integrate Gerrit code review and Jenkins and can be used for project automation purposes beyond gating. Driven by a simple, readable YAML file, Zuul has a set of basic concepts that can be combined to make very powerful automation pipelines. Zuul can perform speculative execution of tests on multiple dependent changes in parallel to keep merges happening quickly for large gated projects. Developers and test engineers can expect to learn how the OpenStack projects uses these tools and techniques, and how they can be applied to their own projects.