Jenkins is the automation server that defined self-hosted continuous integration, and it remains the most widely deployed CI system in the world.

Why self-host Jenkins

Hosted CI is metered by build minutes, and build minutes are expensive for anything that compiles. Jenkins runs on hardware you already own, with as many executors as your machines can support and no per-minute charge. For workloads with long builds, large artifacts, or hardware that must stay on-premises, that economic difference is the entire argument.

What it does

Jenkins falls into the DevOps and CI/CD category of self-hosted software. Pipelines are defined in a Jenkinsfile committed alongside your code, with distributed builds across agent nodes, artifact archiving, test result reporting, and credential management. Its plugin ecosystem runs to well over a thousand plugins covering source control systems, build tools, container registries, cloud providers, notification services, and deployment targets, which is both its greatest strength and its usual complaint.

Community traction

Jenkins has been developed since 2011, originating as Hudson in 2004, and is used by an enormous number of organizations. Its plugin index is the largest in the CI space by a wide margin.

Deployment

Official Docker images, WAR files, and native packages for Debian, Red Hat, and other distributions are all published. Jenkins is a Java application and expects a JVM plus meaningful memory for larger installations.

Alternatives

Woodpecker CI and Drone are dramatically lighter for container-based pipelines. Forgejo Actions and GitLab CI integrate CI directly into the forge rather than running separately. Choose Jenkins when you need its plugin coverage or its distributed build model.

License

Jenkins is released under the MIT License.

Links

• Website
• Repository

Jenkins is rarely the most elegant option and frequently the only one that can do what you need.