What is Jenkins? Why Use Continuous Integration CI Tool?

Jenkins Pipelines are extensible by plugin developers and users with Pipeline Shared Libraries. Now that you understand what is Jenkins pipeline, we can dive deeper into the concept. The entire definition of a Jenkins Pipeline is written into a text file called Jenkinsfile. It contains the steps required for running a Jenkins Pipeline.

how does jenkins work

If all of the tests developed for a feature or release branch are green, Jenkins or another CI system may automatically publish code to staging or production. Changes are done before a merging action can also be seen. Then it’s distributed to a central staging system, a pre-production system, or even a production what is jenkins environment when combined. The concept is called pipeline as a code, and the Domain-specific language is used to define the project. The code is written into Jenkinsfile, and it’s attached to the code repository. Declarative and scripted are the 2 ways companies define Jenkins pipelines for a particular project.

What is Jenkins? – How does Jenkins work? & Advantages

1.Jenkins is a powerful CI application that allows continues integration and continues delivery of projects. Developers know the test result of every commit made in the source code on the run. Jenkins’ internal user database has security features as well. The “Security Realm” and the “Authorization Realm” are the two security realms that Jenkins supports.

how does jenkins work

Now we will create two volumes to store Jenkins data permanently and share the Docker TLS certificates for connecting to it. Now we will go ahead and add the key to the Jenkins repository, without this we cannot install Jenkins. You can see that using Jenkins has not only benefited the company but also its customers as they get top notch software quickly without any hassle. Jenkins is a very flexible tool that can be very carefully molded into what a company needs and finds useful.

What Is Jenkins in DevOps and The Reasons Behind its Popularity

Kohsuke Kawaguchi created Jenkins (then called ‘Hudson’) while working at Sun Microsystems. Hudson was created in the summer of 2004 and the first release was in February 2005. Continuous Integration where the artifacts are automatically created and tested. This aids in identification of issues in the product at an early stage of development. There are hundreds of plugins available in the Update Center, integrating with every tool in the CI and CD toolchain. Kohsuke Kawaguchi first developed Hudson in 2004 while working at Sun Microsystems.

A new version of that file will be created in the version control system that is used for maintaining the repository of source code. Jenkins is a widely used application around the world that has around 300k installations and growing day by day. By using Jenkins, software companies can accelerate their software development process, as Jenkins can automate build and test at a rapid rate.


Jenkins is an excellent CI/CD tool that has excellent functionalities and the best part is that it is free to use. Based on what we discussed in this what is Jenkins blog, we can conclude that Jenkins has features that boost release agility by providing CI services. Jenkins Pipelines can be extremely useful for realizing CD requirements for large-scale projects. Next up in this what is Jenkins blog, we dive into using Maven with Jenkins. Maven project in Jenkins takes advantage of the POM files and reduces the overall effort spent on the configuration of the project. As shown below, the configuration of tools (i.e. JDK and Maven) was successful.

how does jenkins work

Jenkins can be configured to run an initial suite of unit tests to ensure that the commit did not “break the build”. If the tests do not pass, the developer can be immediately notified to take corrective action. ” as it is easy to determine which commit caused the build to fail. If all the unit tests pass, then the build pipeline can proceed to the next phase with integration tests which typically take longer to run.

Important Concepts Of Jenkins Pipeline

When a build is launched on Jenkins sometimes the UI on Jenkins is not correctly refreshed, we need to constantly hit the browser refresh button to see the correct status of the build. Nobody ever got fired for choosing Nagios as an IT monitoring tool, and nobody ever got fired for choosing Jenkins as a CI tool. However, both products are, in my estimation, relics from an age when better options really weren’t available. Jenkins is free, widely used, and has a vibrant ecosystem. However, at this point, I feel certain that it’s coasting on its past reputation.

how does jenkins work

Creating automated tests for distinct environments, such as several Java versions or operating systems, helps foresee and prevent problems in later releases. Checking a Jenkinsfile into a source control tool allows the whole team to edit, review, and adapt the steps in the delivery pipeline. Jenkins is distributed as a WAR archive and as installer packages for the major operating systems, as a Homebrew package, as a Docker image, and as source code. Jenkins also supports installation and scaling on Kubernetes. The source code is mostly Java, with a few Groovy, Ruby, and Antlr files.

What is Jenkins? Continuous Integration With Jenkins

You can use these plugins to automate tasks, like compiling code, running tests, and deploying applications. You can also use Jenkins to orchestrate complex workflows with multiple steps and different tools. The Jenkins Pipeline is the interconnection of several sequential tasks and events.

  • This tutorial shows you how to change the default Jenkins port in Windows, Linux, and macOS.
  • To do this in an organization with multiple teams and multiple projects is difficult if you do so only using one server.
  • There are specialized considerations for some other use cases.
  • We’ve already seen that Jenkins supports building with Maven; it also works with Ant, Gradle, JUnit, Nexus, and Artifactory.
  • Chiradeep is a content marketing professional, a startup incubator, and a tech journalism specialist.
  • Jenkins Pipelines are extensible by plugin developers and users with Pipeline Shared Libraries.
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