jenkins
Jenkins automation server
Jenkins is an open-source automation server that watches your code repository and automatically builds, tests, and deploys software on every change, eliminating manual and error-prone release steps.
Jenkins is a widely-used open-source automation server written in Java. The problem it solves is the repetitive, error-prone manual work involved in building, testing, and deploying software. Every time a developer saves code, someone (or something) needs to compile it, run the tests, check for issues, and if everything passes, put it on a server. Jenkins automates that entire chain, which is commonly called a CI/CD pipeline (Continuous Integration and Continuous Delivery).
Jenkins watches a code repository for changes, then automatically triggers a sequence of steps: compiling the code, running automated tests, scanning for common mistakes, and deploying the result. If any step fails, it alerts the team immediately rather than letting problems accumulate. Jenkins supports over 2,000 plugins, which are add-ons that let it work with virtually any tool, programming language, or cloud platform.
You would use Jenkins if your team ships software frequently and wants every code change validated automatically before it reaches users. It can run as a WAR file (a packaged Java application), a Docker container, or an installer on Linux or Windows. Teams of all sizes use it, from startups to enterprises handling large-scale deployments. The two release tracks are a weekly release for the latest features and a Long-Term Support release for teams that prioritize stability.
Where it fits
- Automatically run tests every time a developer pushes code and alert the team immediately if something breaks.
- Set up a pipeline that builds a Docker image, runs integration tests, and deploys to staging on every merge to main.
- Schedule nightly builds of a large Java project and email the team a summary of failures.
- Connect Jenkins to GitHub to block pull request merges until all CI checks pass.