Jenkins is an open-source automation server that runs repeatable software-delivery tasks, such as building code, running tests, checking code quality, and deploying an application. Teams commonly describe those workflows as Pipelines: a Jenkinsfile can define the steps in source control, while a Jenkins controller coordinates work and agents execute it.
Jenkins is software you operate, not a hosted button that removes infrastructure work. You choose how to install it, provide the machines and tools for jobs, and maintain security, plugins, and updates.
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What Jenkins is used for
Jenkins automates tasks related to building, testing, delivering, and deploying software. A project might use it to compile an application after a code change, run automated tests, perform static analysis, and then publish or deploy the result. The specific jobs depend on the tools, plugins, and workflow configured by the team; a bare Jenkins installation does not necessarily include every capability shown in tutorials. Jenkins User Documentation describes Jenkins as a self-contained, open-source automation server for these tasks.
Jenkins is extensible through plugins, which connect it to development tools and add capabilities. That flexibility also means plugin selection affects what an installation can do and what administrators must update and support.
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How Jenkins CI/CD works
Pipeline describes the workflow
Jenkins Pipeline is a suite of plugins for representing continuous-delivery workflows as code through a Pipeline DSL. The workflow can include steps for building, testing, packaging, and deploying an application. The Pipeline documentation explains the model.
A Jenkinsfile keeps workflow code with the project
A Jenkinsfile is a text file containing a Pipeline definition. Teams commonly store it in the same source-control repository as the application, so workflow changes can be reviewed and versioned alongside code. In Declarative Pipeline, an agent allocates an executor and workspace, while stages and steps describe the work to perform. See Using a Jenkinsfile for syntax and examples.
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Controller coordinates; agents run jobs
The controller coordinates the Jenkins environment and orchestrates jobs. Agents provide execution capacity: they run the build work in an environment with suitable tools and resources. Jenkins’ scaling guidance recommends giving agents adequate memory and I/O for their workloads and moving actual build execution off the controller when appropriate.
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This separation helps teams assign different jobs to suitable machines, but it does not eliminate operations. Someone must provision and monitor the controller and agents, manage their access to networks and credentials, and keep the environment maintained.
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Ways to install Jenkins
Jenkins documentation describes installation with native operating-system packages, Docker, or a standalone distribution that runs with a Java Runtime Environment. The right option depends on the environment and on who will manage updates, persistence, and security.
| Approach | What to plan for |
|---|---|
| Native package | Use the package instructions for the operating system and plan how Jenkins and its runtime will be updated and backed up. |
| Docker | Check the exact image and tag, configure persistent storage, and plan how image updates will be deployed. The recommended official image carries the current LTS release, but does not include the Docker CLI or commonly used Blue Ocean plugins. Image contents are not identical across all Jenkins images. See the Docker installation documentation. |
| Standalone Java-based distribution | Provide a supported Java runtime and manage the Jenkins process, updates, storage, and network exposure yourself. Follow the installation instructions in Jenkins User Documentation. |
For any approach, decide where Jenkins data and job workspaces live, how they will be backed up, how updates will be tested, and which tools builds need. If deploying with Docker, do not assume the image includes every command-line tool or plugin your pipeline requires.
Java runtime requirements depend on the Jenkins release
Jenkins’ Java support policy is release-specific. As of October 3, 2026, the official policy lists Java 21 or Java 25 for both LTS 2.555.1 (April 2026) and weekly 2.545 (January 2026). These requirements apply to Jenkins components such as controllers and agents; consult the Java Support Policy for the release you plan to install because supported versions can change.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsThe Java version Jenkins itself needs is not necessarily the version your project must use to build. A pipeline may select or install a separate project toolchain, and individual plugins can add constraints. Check the requirements for your Jenkins release, agents, plugins, and build tools rather than treating one Java version as universal.
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Security and maintenance are part of running Jenkins
Jenkins administrators need to configure authentication and authorization, decide who can create or edit jobs, and understand protections such as CSRF protection and controller-agent access control. The official Managing Security guide explains these controls and their trade-offs. Security should be enabled for non-test environments; the right configuration depends on how Jenkins is exposed and what jobs can access.
- Limit access: consider who can reach the controller and who is permitted to configure or run jobs.
- Protect credentials: review which secrets a job can use and which agents or external systems it can reach.
- Maintain plugins: plugins affect both capability and upkeep; assess updates and compatibility rather than installing features indiscriminately.
- Plan updates and recovery: test important plugin or configuration changes on a separate test controller where practical, and maintain backups of Jenkins data.
- Monitor capacity: size controller and agents for actual workloads, and add execution capacity as needed. High availability and additional nodes are operational choices, not guarantees built into every installation.
Jenkins versus a hosted CI service
Jenkins is a fit when a team wants to control its automation environment and is prepared to operate it. A hosted CI service shifts some infrastructure management to the provider, while Jenkins operators remain responsible for their own controller, agents, updates, security, and scaling. Exact cost and service-level comparisons depend on the specific provider and deployment, so they cannot be settled by the Jenkins installation method alone.
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