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DevOps Intermediate

What is Jenkins?

An open-source automation server for building, testing, and deploying software through configurable CI/CD pipelines.

Jenkins is the most widely used CI/CD server. Pipelines are defined in Jenkinsfiles (Groovy-based DSL) with stages like Build, Test, and Deploy. Jenkins supports thousands of plugins for integration with virtually any tool.

Features include distributed builds (master/agent architecture), pipeline-as-code, Blue Ocean UI, shared libraries, and extensive plugin ecosystem. While newer tools (GitHub Actions, GitLab CI) offer simpler setup, Jenkins remains dominant in enterprise environments.

Related Terms

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The acceptable amount of unreliability allowed for a service, calculated as 100% minus the Service Level Objective.
Microservices
An architectural style where an application is composed of small, independent services that communicate over APIs.
Packer
A tool for creating identical machine images for multiple platforms from a single configuration file.
Docker Volume
A mechanism for persisting data generated by Docker containers, surviving container restarts and removals.
Trunk-Based Development
A source control strategy where developers integrate small changes directly into the main branch frequently, often multiple times per day.
Artifact Repository
A centralized storage system for build artifacts like compiled binaries, packages, and container images used in CI/CD pipelines.
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