Today when we talk about CI/CD, one name almost always comes first - Jenkins.
But many engineers don't know that Jenkins originally started as another tool called Hudson.
This is the story of how a small open-source CI server became one of the most influential DevOps tools in the industry.
The Early CI/CD Era
In the early 2000s, Continuous integration was still evolving.
Teams were struggling with:
- Manual Builds
- Integration Conflicts
- Unstable Deployments
- Poor Automation
One of the earliest popular CI tools was CruiseControl, introduced around 2001.
Although revolutionary for its time, it was difficult to configure and maintain.
Hudson Was Born (2005)
In 2005, Kohsuke Kawaguchi created Hudson while working at Sun Microsystems.
Hudson simplified build automation dramatically.
Developers could:
- Automate builds
- Run tests automatically
- Schedule jobs
- Receive build notifications
- Integrate with version control systems
Hudson quickly became popular because it was:
- Free
- Open-source
- Flexible
- Easy compared to older CI tools
At that time it felt like a breakthrough for automation.
Oracle Acquires Sun Microsystems
Everything changed in 2010.
Oracle acquired Sun Microsystems, which meant Oracle now owned:
- Java
- Hudson
- Several other Sun technologies
This created a tension within the open-source community.
Many contributors worried about:
- Corporate control
- Trademark ownership
- Future governance
- Slower innovation The community wanted Hudson to remain Community-driven.
The Jenkins Fork (2011)
In 2011, The majority of the Hudson community decided to fork the project.
That fork became Jenkins.
Initially:
- Jenkins and Hudson were almost identical
- Same codebase
- Same plugins
- Same Functionality
But the difference was governance.
Most developers, contributors, and plugin maintainers moved to Jenkins instead of staying with Hudson.
This became the turning point.
Why Jenkins Won
Jenkins grew rapidly because of several reasons:
Massive Plugin Ecosystem
Jenkins integrated with almost everything:
- Git
- Docker
- Kubernetes
- AWS
- Terraform
- Maven
- SonarQube
- Slack This flexibility made Jenkins useful beyond CI/CD.
Strong Open-Source Community
The community around Jenkins exploded.
Tutorials, plugins, documentations, and support became available everywhere.
It became the default automation tool for many organizations.
Enterprise Adoption
Large enterprises adopted Jenkins heavily because:
- It was free
- Highly customizable
- Worked on-premises
- Supported hybrid infrastructure
What Happened To Hudson
Hudson continued for a few years under the Eclipse Foundation.
However:
- Community activity declined
- Plugin ecosystem weakened
- Adoption dropped significantly
Eventually Hudson became mostly obsolete.
Today:
- Very few organizations still use Hudson
- Jenkins dominates traditional CI/CD environments
- Many engineers don't even realize Jenkins came from Hudson
Was This A Loss For Oracle?
Technically, Yes -- at least from a community and ecosystem perspective.
Oracle lost:
- Contributor support
- Community trust
- Control over a rapidly growing CI/CD ecosystem
But financially, Hudson itself was never Oracle's main business focus.
Oracle continued focusing on:
- Databases
- Enterprise software
- Cloud infrastructure
Meanwhile Jenkins became one of the most recognized DevOps tools in the world.
Final Thoughts
The Hudson -> Jenkins story is one of the most important moments in the DevOps history.
It showed something powerful about open-source software:
"Sometimes the community matters more than ownership."
Even today, despite the rise of GitHub Actions, GitLab CI/CD, and cloud-native automation platforms, Jenkins still remains deeply embedded in enterprise infrastructure worldwide.
And it all started with Hudson.
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