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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

Microservices
An architectural style where an application is composed of small, independent services that communicate over APIs.
ELK Stack
A popular log management platform combining Elasticsearch (search), Logstash (processing), and Kibana (visualization).
Immutable Deployment
A deployment strategy where new versions replace existing instances entirely rather than updating them in place.
Observability
The ability to understand a system's internal state from its external outputs through metrics, logs, and traces.
Prometheus
An open-source monitoring and alerting toolkit that collects time-series metrics using a pull-based model.
GitHub Actions
A CI/CD platform integrated into GitHub that automates build, test, and deployment workflows using YAML configuration.
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