Software development

What Is Jenkins and How Does it Work? Intro and Tutorial

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As you can see in the diagram provided above, on the left is the Remote source code repository. The Jenkins server accesses the master environment on the left side and the master environment can push down to multiple other Jenkins Slave environments to distribute the workload. Jenkins is a CI tool and a CI/CD tool but it is specifically a «continuous integration» tool, restaurant app builder not a «continuous deployment/continuous delivery» tool. Now, the Jenkins server keeps a regular check at the repository. As soon as the commit occurs, the Jenkins server discovers the changes and pulls them. 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.

what is jenkins

He has acted as an architect and development leader in the implementation of a number of mission-critical systems for companies in a range of industries. He is a Sun-certified Java Developer and a Certified ScrumMaster. Use the tool to get open source technology recommendations from our team of enterprise architects from OpenLogic by Perforce. In this blog, we give an overview of Jenkins, how it’s used, and tips for teams ready to move forward with integrating this popular open source CI/CD tool.

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We can add more nodes using IP address, user name and password using the ssh, jnlp or webstart methods. Jenkins follows Master-Slave architecture to manage distributed builds. In this architecture, slave and master communicate through TCP/IP protocol. Continuous integration requires the developers to have regular builds.

what is jenkins

The developer Kohsuke Kawaguchi, who worked at Sun systems, wanted to create a method to perform continuous integration. The idea was to test the code before committing to avoid breaking builds. Jenkins is a self-contained, open source automation server which can be used to
automate all sorts of tasks related to building, testing, and delivering or
deploying software. With hundreds of plugins in the Update Center, Jenkins integrates
with practically every tool in the continuous integration and
continuous delivery toolchain.

What is Jenkins? The CI server explained

So to overcome such chaos there was a dire need for a system to exist where developers can continuously trigger a build and test for every change made in the source code. Jenkins is the most mature CI tool available so let us see how Continuous Integration with Jenkins overcame the above shortcomings. Jenkins is a server that encompasses various integration, testing, and deployment technologies as pre-built packages on one unified platform.

what is jenkins

The Jenkinsfile uses a curly bracket syntax that looks similar to JSON. Steps in the pipeline are declared as commands with parameters and encapsulated in curly brackets. The Jenkins server then reads the Jenkinsfile and executes its commands, pushing the code down the pipeline from committed source code to production runtime. A Jenkinsfile can be created through a GUI or by writing code directly. Jenkins is an open source continuous integration/continuous delivery and deployment (CI/CD) automation software DevOps tool written in the Java programming language. The leading open source automation server, Jenkins provides
hundreds of plugins to support building, deploying and automating
any project.

Jenkins Features

Jenkins is the most popular and widespread tool that DevOps teams use to create software projects by developing and testing them continuously. It offers the most needed automation to accelerate the development process. Jenkins provides the ability to run a build in parallel across multiple machines to minimize the total amount of time it takes to complete many of these activities. Finally, Jenkins can deploy the build to an environment that allows for any needed user acceptance testing (UAT) before releasing it into production. These simplified steps encompass the spirit of a continuous integration (CI) environment. It is a configuration tool that allows you to define your build process with a series of plugins.

Earlier in this ‘what is Jenkins’ blog section titled Master- Agent Architecture in Jenkins, we had a look at the architecture of Jenkins. Here, we will demonstrate the creation of Jenkins Agents (or Nodes) on Windows 10 to further understand how does Jenkins work. Search for httpPort in the file and change from 8080 to a preferred port of choice (e.g. 9090 in our case). As we mentioned in step-2 above, you need to have admin rights to perform this change. This Jenkins Tutorial for beginners and professionals will help you learn how to use Jenkins, one of the most popular CI/CD tools used in DevOps. For more in-depth resources, check out our content hub on Jenkins Tutorial.

Jenkins Management

Jenkins X offers feedback for all pull requests, providing previews before pushing code changes to the staging and production environments. It helps you incorporate authentication and reliability early on, preventing post-deployment surprises. You leverage a higher degree of automation to enable frequent, secure, and predictable software releases. You might need to modify your Jenkinsfile to enable it to run with the project.

  • For example, job creation and other administrative tasks should only be available to the system administrator.
  • Consequently, Hudson is no longer maintained by the community.
  • Jenkins is not simply limited to continuous integration and continuous delivery (CI/CD).
  • Davinder Passed his post-graduation with merit, he was the first one to submit his project on time, He is highly skilled in typing and research work.
  • Not only that, but it also provides pipeline visualizations with an integrated failure detection function.
  • A pipeline is a set of actions that Jenkins will take to complete the CI/CD tasks.
  • Continuous development refers to the process of automating the development and packaging of source code and deploying it to testing and production environments.

If this build is green, the tested and executed code is ready for deployment. If the problem persists, the team will have to start over and fix it. The word «continuous integration» or «continuous deployment» refers to the fact that this is an ongoing operation. It is evident from the above-stated problems that not only the software delivery process became slow but the quality of software also went down.

Jenkins Master

This is not installed by default but with Jenkins X it is easy to install any helm chart and so designed to work great with our inspirational project Jenkins. Jenkins X GitOps works with External Secrets to provide an integrated experience so your secrets source of truth is a secrets manager and the values are replicated into the cluster when needed. Jenkins X aims to use the cloud well, Kubernetes to host the core services, storage buckets for long term storage, container registries and hosted services like secrets managers. Jenkins X defers to Terraform to setup and manage the Cloud infrastructure needed by Jenkins X. So, in a nutshell, It can help automate any of the phases of SDLC, starting from development to deployment and even after deployment in the form of monitoring. Security measures likewise protect the internal user database of Jenkins.

Docker is a containerization platform allowing you to create, deploy, and run applications in containers. The Jenkins master orders the slave to execute several tasks. Jenkins runs parallel builds across several machines to decrease the total time consumed to complete the other activities.

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You can install/upgrade all available plugins from the Jenkins dashboard. The Jenkins Agent connects to the Jenkins Controller to run build jobs. To run it, you’ll need to install Java on a physical machine, virtual machine, cloud compute instance, Docker image, or Kubernetes cluster.

Next-Gen App & Browser Testing Cloud

You can utilize container technology such as Docker and Kubernetes, initiate tests and then take actions like rolling back or rolling forward in production. Once you have Jenkins configured, it’s time to create some projects that Jenkins can build for you. While you can use the web UI to create scripts, the current best practice is to create a pipeline script, named Jenkinsfile, and check it into your repository.

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The Jenkins X project was formerly launched in 2018 with the goal of creating a modern, cloud native Jenkins. It is also a project under the guidance of the CD Foundation. Its architecture, technology and pipeline language are completely different from Jenkins. Jenkins X is designed for Kubernetes and uses it in its own implementation. Other cloud native technology that Jenkins X uses are Helm and Tekton. Jenkins runs as a stand-alone package or on a Java application server.

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