With a plethora of continuous integration tools available out there, Jenkins is among the top-ranked ones. Jenkins is an open-source automation tool developed in Java primarily for continuous integration. With Jenkins, developers find it easy and straightforward to integrate any change into software products. If you wish to learn Jenkins in detail, we recommend you enroll in our Jenkins Training. Here we have prepared a complete guide on Jenkins to explain what Jenkins is and how it works to achieve continuous integration. Jenkins has a long history, stretching back to 2011, and its roots extend back even further to 2004.

What is Jenkins and How Does It Work

Jenkins t can automate testing tasks, such as running tests and generating test reports, but these tests are incorporated manually. Moreover, in collaboration with Docker, Jenkins escalates the progress of the development team working on different projects. It also provides the software infrastructure with Agile development throughout the journey. Docker is a containerization platform allowing you to create, deploy, and run applications in containers. You can have various users in the Jenkins pipeline to edit and execute several processes.

UI Design Tools You Should Know About

It also schedules the jobs and assigns builds to these agents to execute these jobs. The server also tracks the offline or online status of the agents and replays the build result responses to the console output. Several of the key projects CloudBees has developed include Jenkins X, Jenkins Pipeline and Jenkins 2. Additionally, all fixes made by CloudBees in the open source code are contributed back to the project – which helps us all to enjoy an ever-higher quality Jenkins experience. Build Jobs are processes that allow you configure a string of
software development processes that help you develop your software. In Jenkins, it’s simple to identify which commit was responsible for the build failing.

What is Jenkins and How Does It Work

The Stage block is used by many plugins for providing the visualization of Jenkins status (and progress). Declarative Pipeline is a recent feature of Jenkins Pipeline that makes reading and writing the Pipeline code a lot easier. Unlike Scripted Syntax with Pipelines, Declarative Syntax helps in controlling different aspects of the Pipeline in a simplistic manner.

Advantages of using Jenkins

Instead, developers need to keep their eyes out only on the smaller fragment of code they committed. This accelerates development and helps in rolling out more application releases faster. The next significant advantage is that Jenkins handles all the heavy-duty labor that must be undertaken in parallel when a build is made. Developers need only to commit their changes, and Jenkins will manage all other processes autonomously. Elimination of manual effort ultimately results in better efficiency and also lower costs for enterprise technology development. The main purpose of Jenkins is to automate the continuous integration and delivery processes in software development.

  • Created by Kohsuke Kawaguchi, Hudson was one of the first commercially available CI tools that supported git (created the same year).
  • We will be selecting the “Delete workspace before build starts”,
    this will clean up the workspace in the Jenkins server where this build job
    will run, in our case “Agent 1”.
  • Though Gitlab covers the CI/CD cycle thoroughly, it fails to do so for automation tasks since it does not have scheduling options.
  • A plain text file called Jenkinsfile (defined by a domain-specific language (DSL)) contains the necessary instructions (declared in JSON-like syntax) required to run the Jenkins pipeline.
  • Jenkins runs as a stand-alone package or on a Java application server.

You can call these slaves as also agents that execute tasks based on your configurations. If you want, you can specify which task should be executed on which slave or you can leave it up to the master to decide. It will decide this by checking which slave is idle or which slave has enough hire jenkins developers of a resource pool to execute the tasks. It helps automate the parts of software development related to building, testing, and deploying, facilitating continuous integration and continuous delivery. It is a server-based system that runs in servlet containers such as Apache Tomcat.

Benefits of Jenkins

Pipeline code is wrapped around a groovy script that is easy to write and manage. While nothing is better than a great free product, sometimes there is a little bit of truth to the old adage, “you get what you pay for”. Jenkins proves to be an excellent open-source platform, however, there are some drawbacks to using open-source tools, especially when running a developer team for a business. Although there are many uses of Jenkins, it often looks fundamentally similar. Design patterns and Java Annotations for plugins are used to specify how the plugin is created, how it extends other plugins, and how its user interface appears in Jenkins.

Jenkins slave is used to execute the build jobs dispatched by the master. We can configure a project to always run on a particular slave machine, or particular type of slave machine, or simple let the Jenkins to pick the next available slave/node. Jenkins also supports GitOps workflows with Jenkins X. It helps you accelerate the continuous delivery pipeline on Kubernetes. Created by Kohsuke Kawaguchi, Hudson was one of the first commercially available CI tools that supported git (created the same year). In 2010, The Jenkins fork split ways from Hudson due to disagreements in how to manage the software, and the majority of the original core contributors joined the Jenkins team.

Jenkins Features

This type of approach is useful when you need to develop complex and extremely large software applications. Also, the microservices architecture makes it possible to quickly add new features to existing applications and bring them to market. CI is a process that enables you to integrate code changes from multiple developers working on a single project quickly and repeatedly. If the tests pass, the code can be integrated into the build, which can similarly be tested and immediately verified.

What is Jenkins and How Does It Work

The Jenkins project includes a large plugin ecosystem, the community around it is thriving and it is actively developed. If that sounds appealing to you, then give Jenkins a look for your CI/CD needs. Jenkins, as a Java-based CI server with strong community support and a huge plugin ecosystem, is a powerful tool for anyone looking to add CI/CD to their project. It’s used to implement Continuous https://www.globalcloudteam.com/ Integration (CI) and Continuous Delivery (CD) for any development project. The definition of a Jenkins Pipeline is written into a text file (called a Jenkinsfile) which in turn can be committed to a project’s source control repository. [2] This is the foundation of “Pipeline-as-code”; treating the CD pipeline a part of the application to be versioned and reviewed like any other code.


Jenkins Pipeline (or simply “Pipeline” with a capital “P”) is a suite of plugins which supports implementing and integrating continuous delivery pipelines into Jenkins. The fail fast strategy is always of the utmost importance when deploying to production. Since every change is deployed to production, it is possible to identify edge cases and unexpected behaviors that would be very hard to identify with automated tests. To fully take advantage of continuous deployment, it is important to have solid logging technology that allows you to identify the increasing error count on newer versions. Beginning with the second version, Jenkins introduced Pipelines, a different way to programmatically define a project build workflow. Before pipelines, the CI description was defined and stored outside the repository—it was designed to evaluate—now, with Pipelines, CI files are present in project source code.

It builds from various branches are automatically grouped to make branch management easier. Jenkins automatically generates a new project when a new branch is pushed to a source code repository. Other plugins can specify different branches, such as a Git branch, a Subversion branch, a GitHub Pull Request, and so on. A pipeline is a set of steps the Jenkins server will execute to complete the CI/CD process’s necessary tasks. In the context of Jenkins, a pipeline refers to a collection of jobs (or events) connected in a specific order. It is a collection of plugins that allow the creation and integration of Continuous Delivery pipelines in Jenkins.

DevOps Engineer Salary – How Much Does A DevOps Engineer Earns?

The screenshot below shows the configuration web form for a multibranch pipeline. Fast-forward to 2011, and a dispute between Oracle (which had acquired Sun) and the independent Hudson open source community led to a fork with a name change, Jenkins. In 2014 Kawaguchi became CTO of CloudBees, which offers Jenkins-based continuous delivery products. Jenkins is well-known, with an extensive knowledge base, comprehensive documentation, and a thriving community. It has learning materials that make installing, managing, and troubleshooting Jenkins installations much more accessible. While it is straightforward to set up (with clear instructions), production in Jenkins can be challenging to apply.