Freedom251 › Continuous Integration Software
Zuul
What Zuul is
Zuul is a free, open-source project gating system that checks proposed code changes before they merge. It can test changes across branches and repositories together, including in-flight changes and their dependencies, so projects can evaluate a combined future state. Zuul uses Ansible to coordinate jobs across multiple nodes, and it can run shell scripts without requiring users to write Ansible. Source integrations include Gerrit, GitHub, GitLab, Pagure, and Git; provider drivers include AWS, Azure, Kubernetes, OpenStack, and static nodes. Its web service provides a dashboard, REST API, and websocket log streaming. Zuul is self-hosted on an operator’s infrastructure, and a single installation can serve multiple projects or groups with configurable separation. Jobs run in isolated bubblewrap namespaces; the system supports encrypted secrets and dynamically generated OpenID Connect tokens for jobs. Zuul and Nodepool use ZooKeeper for internal coordination, and its documentation recommends securely backing up keystore keys. The software is developed under the Apache 2 license and managed by the Open Infrastructure Foundation.
Who it suits
Zuul suits teams that need to gate repository changes across multiple branches or projects and can operate a self-hosted service. Its integrations and job orchestration are relevant to teams using the listed source and build node providers.
What it does well
- Tests dependent changes across branches and repositories
- Coordinates multi-node jobs with Ansible or shell scripts
- Includes source drivers for five systems
- Free and open source under Apache 2
What to know first
- Requires self-hosting on operator infrastructure
- Uses ZooKeeper for internal coordination
- Documentation recommends secure keystore backups
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Zuul | Free and open source software · self-hosted or available through separately offered managed services | Free |
As zuul-ci.org lists them, read 11 Oct 2026. The maker's own page has the final word.
Verdict
Zuul is a fit for teams that want coordinated, multi-project change gating and can manage their own deployment. Its self-hosted model and ZooKeeper dependency are operational requirements to account for.
Facts from Zuul's own pages
- Ansible jobs
- Zuul uses Ansible to orchestrate jobs across multiple nodes, and it can also run shell scripts without requiring users to write Ansible. · zuul-ci.org, 11 Oct 2026
- API
- Zuul provides a REST API, and its documentation describes the OpenAPI specification as a work in progress. · zuul-ci.org, 11 Oct 2026
- Build node providers
- Zuul includes provider drivers for AWS, Azure, Kubernetes, OpenStack, and static nodes. · zuul-ci.org, 11 Oct 2026
- Commercial support
- The project site lists enterprise distribution, managed on-prem service, support, training, and development as options offered by Acme Gating. · zuul-ci.org, 11 Oct 2026
- Community support
- Users can ask usage questions on the zuul-discuss mailing list or in the project’s Matrix room. · zuul-ci.org, 11 Oct 2026
- Deployment
- Zuul is a self-hosted service, and its documentation describes running it on an operator’s infrastructure. · zuul-ci.org, 11 Oct 2026
- Gating
- Zuul tests proposed changes together with in-flight changes and their dependencies before they are merged. · zuul-ci.org, 11 Oct 2026
- Integrations
- Built-in source drivers include Gerrit, Git, GitHub, GitLab, and Pagure; provider drivers include AWS, Azure, Kubernetes, OpenStack, and static nodes. · zuul-ci.org, 11 Oct 2026
- Jobs
- Zuul uses Ansible to orchestrate tasks across multiple nodes, and can also run shell scripts without requiring users to write Ansible. · zuul-ci.org, 11 Oct 2026
- Kubernetes
- The Zuul Operator is a Kubernetes operator designed to simplify creating and maintaining Zuul systems in Kubernetes. · zuul-ci.org, 11 Oct 2026
- License and stewardship
- Zuul is collaboratively developed under the Apache 2 license and managed by the Open Infrastructure Foundation. · zuul-ci.org, 11 Oct 2026
- Multi-project testing
- Zuul can test changes across multiple branches and repositories, including in-flight changes and their dependencies. · zuul-ci.org, 11 Oct 2026
- Multi-tenancy
- A single Zuul installation can serve multiple projects or groups with configurable separation between them. · zuul-ci.org, 11 Oct 2026
- Multi-tenant
- A single Zuul installation can serve multiple projects or groups, with configurable separation between them. · zuul-ci.org, 11 Oct 2026
- Open source
- Zuul is free and open source software, collaboratively developed under the Apache 2 license and managed by the Open Infrastructure Foundation. · zuul-ci.org, 11 Oct 2026
- Operational requirement
- Zuul and Nodepool use ZooKeeper for internal communication and coordination, and the documentation recommends periodically exporting and backing up the keystore keys. · zuul-ci.org, 11 Oct 2026
- Purpose
- Zuul is a project gating system that tests proposed future states of code repositories and their changes before they merge. · zuul-ci.org, 11 Oct 2026
- Review integrations
- Zuul includes source drivers for Gerrit, GitHub, GitLab, Pagure, and Git. · zuul-ci.org, 11 Oct 2026
- Secrets
- Zuul stores project encryption keys in ZooKeeper, and its documentation recommends backing them up securely because they protect job secrets and SSH access. · zuul-ci.org, 11 Oct 2026
- Security
- Zuul runs playbooks in isolated bubblewrap namespaces and supports encrypted data secrets and dynamically generated OpenID Connect tokens for jobs. · zuul-ci.org, 11 Oct 2026
- Security reporting
- The Zuul community directs suspected vulnerabilities in its components to a documented vulnerability reporting process. · zuul-ci.org, 11 Oct 2026
- Support
- The project offers user and developer mailing lists, a Matrix chat room, and a documented process for reporting security vulnerabilities. · zuul-ci.org, 11 Oct 2026
- Web interface and API
- The zuul-web service provides a web dashboard, REST API, and websocket log streaming service. · zuul-ci.org, 11 Oct 2026
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