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Jenkins
The leading open-source automation server enabling developers to reliably build, test, and deploy their software across continuous integration and continuous delivery pipelines.
About Jenkins
Jenkins is a self-contained, open-source automation server designed to automate tasks related to building, testing, and delivering software. Originally developed as Hudson in 2004, Jenkins has grown into the industry standard for continuous integration (CI) and continuous delivery (CD), providing a robust foundation for DevOps practices globally.
Built with Java, Jenkins operates on Windows, macOS, and Unix-like operating systems. It is renowned for its vast plugin ecosystem, which allows teams to integrate the server with practically any tool in their CI/CD toolchain. Through its Pipeline-as-Code capabilities, Jenkins enables developers to define complex delivery pipelines using a simple domain-specific language (DSL).
With a distributed architecture, Jenkins can easily scale its workloads across multiple machines, ensuring fast build times and high availability for enterprise environments. It serves as an unopinionated orchestrator, offering unparalleled flexibility to engineering teams who need to customize their software delivery workflows to exact specifications.
Key Features
- Pipeline as Code: Define and manage continuous delivery pipelines using a declarative or scripted Jenkinsfile stored alongside source code.
- Extensible Plugin Architecture: Access over 1,800 community-contributed plugins supporting version control, build tools, cloud providers, and testing frameworks.
- Distributed Builds: Distribute build and test workloads across multiple machines and platforms for faster execution and resource optimization.
- Easy Installation: Deploy via native system packages, Docker, or as a standalone Java program (WAR file) requiring minimal setup.
- Blue Ocean UI: Utilize a modern user experience designed specifically for Jenkins Pipelines to visualize, monitor, and diagnose deployment statuses.
- Active Open Source Community: Benefit from continuous updates, security patches, and extensive community-driven documentation and support forums.
Pricing
- Open Source Edition: $0/month Jenkins is completely free and open-source under the MIT License. Organizations are responsible for the infrastructure (servers or cloud compute) required to host the controller and agent nodes.
Use Cases
- Implementing continuous integration for complex legacy and modern codebases.
- Automating infrastructure deployments through integration with configuration management tools.
- Orchestrating multi-stage test suites across different operating systems simultaneously.
- Self-hosting CI/CD infrastructure for strict compliance and data security requirements.
Pros & Cons
Pros:
- Completely free and open-source without artificial licensing limits on users or jobs.
- Unmatched flexibility through thousands of plugins for virtually every existing DevOps tool.
- Highly customizable pipeline definitions tailored to complex enterprise workflows.
Cons:
- Requires dedicated infrastructure and administrative overhead to maintain and secure.
- Plugin dependency conflicts can occasionally cause system instability during upgrades.
Integrations
Git, GitHub, Docker, Kubernetes, Jira, AWS, Slack, Maven, SonarQube
FAQ
Is Jenkins completely free to use?
Yes, Jenkins is an open-source automation server distributed under the MIT License, meaning the software itself is completely free. Users only pay for the infrastructure (servers, cloud instances) required to host and run it.
What is a Jenkinsfile?
A Jenkinsfile is a text file that contains the definition of a Jenkins Pipeline. It allows developers to configure their CI/CD pipelines as code, which can be checked into version control alongside the application source code.
Does Jenkins support Docker and Kubernetes?
Yes, Jenkins has deep integrations with both Docker and Kubernetes. It can build Docker images, run pipeline stages inside ephemeral Docker containers, and dynamically provision Jenkins agents on a Kubernetes cluster to scale workloads on demand.
What are Jenkins agents?
Jenkins agents (previously called slaves) are separate machines or containers that the Jenkins controller connects to. The controller delegates build, test, and deployment tasks to these agents to distribute the workload and execute tasks across different operating systems.
How do I secure my Jenkins server?
Security is typically managed by configuring access controls, integrating with identity providers (like LDAP or Active Directory), using role-based access control (RBAC) plugins, and securing communications via TLS/SSL. Regular plugin and core updates are also required.
Last edited
October 29, 2026 at 6:56 PM by Venkatraman Chandrasekaran
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