What is Jenkins? CI CD Server Introduction

Each developer makes changes to code, and each change has potential issues. The idea proved successful and quickly spread to the rest of his team. As a result, Kohsuke Kawaguch created the Jenkins project and open-sourced the program.

How Jenkins works

Development teams have several members, so multiple commits might have bugs. With CI, it is easier to detect these bugs early before pushing the changes in production. Integrating every piece of code into one executable form takes place, known as a build. If this build is green, the executed code is ready for deployment. Otherwise, the team has to settle the bug and repeat the entire process from scratch.

Difference between Jenkins vs Gitlab CI

A developer would write big batches of code for various features and then wait for this feature branch to be merged into the trunk, i.e. the master branch. Then one of the senior developers tried the application on his development machine. This must be a lengthy but controlled approach to deployment that their environment specialists carried out. Finally, the application is manually deployed on the production servers for release. Builds can be performed on demand by developers who want to verify that their feature/bug fix works without having to wait for the next scheduled build (e.g., “Cron” mode).

Scripted Pipeline is a more traditional way of writing a Jenkins Pipeline as code. The Web UI of Jenkins is normally used for writing the Scripted Pipeline in a Jenkinsfile. 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. Search for httpPort in the file and change from 8080 to a preferred port of choice (e.g. 9090 in our case).

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So, developers in India would be forced to commit their code in the middle of the day and then wait for the “nightly” build to run, affecting their productivity. Then, once the build completed, the development teams would often be faced with the question of, “Who broke the build? At this point, the development teams would scramble to determine who’s commit broke the build and the finger-pointing would begin.

For the code to move through the Jenkins pipeline, it must first be committed to the source code repository. If you prefer writing code, you may construct a Jenkinsfile using a graphical user interface (GUI). Initially, a developer integrates a new piece of code into the existing source code and commits. Now, the Jenkins server performs a regular repository check and finds and pulls the changes as soon as the developer commits the new code. Along with continuous integration, Jenkins also supports continuous delivery and continuous deployment.

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Each phase is monitored and allows you to stop the entire process and the change will be reported to the user by Jenkins. In large companies, it is common for multiple teams to work on the same project without knowing what the other teams are doing on the same code base. Those changes can create bugs that will only be revealed when both codes are integrated into the same branch. Since Jenkins can run its predefined jobs for every commit, it will be able to detect and notify developers that something is not right and where it is. The Jenkins Pipeline is a user-made model for the continuous delivery pipeline.

As a result, every commit made to the source code in the repository was built. If the build result shows that there is a bug in the code, then the developers only need to check that particular commit. This significantly reduced the time required to release new software. Once the Jenkins server is configured, you will be able to execute a series of automated tests and builds so that your code is always up to date and valid. Implementing CI/CD through a tool like Jenkins can greatly simplify the process of ensuring a high level of code quality and successful builds.

Available Plugins

It is now one of the most used
CI/CD tools in the industry out there. Blue Ocean’s user interface strives to simplify the user’s journey by removing extraneous elements and simplifying the menu structure. In addition, the modern visual design provides much-needed relaxation for developers, as displays adapt instantaneously to server changes making laborious page refreshes a thing of the past.

  • So Jenkins makes use of a master slave architecture, where one Jenkins server is the master from where all the tasks are distributed onto the multiple slaves.
  • Jenkins can be distributed as a set of WAR files, installers, Docker images, and native packages.
  • Continuous deployment, also known as continuous implementation, is an advanced stage of continuous delivery that the automation process does not end at the delivery stage.
  • Apart from these, many tools help with the analysis and reporting of tests.
  • It manages and controls several stages of the software delivery process, including build, documentation, automated testing, packaging, and static code analysis.
  • You leverage a higher degree of automation to enable frequent, secure, and predictable software releases.

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.

What is the Jenkins Pipeline?

Learn how to create a Jenkins project and run the resulting build job. The Jenkins X project was formerly launched in 2018 with the goal of creating a modern, cloud native Jenkins. hire jenkins developers Its architecture, technology and pipeline language are completely different from Jenkins. Jenkins X is designed for Kubernetes and uses it in its own implementation.

How Jenkins works

When Jenkins tasks run, they collect console output from stdout and stderr parameters. This makes troubleshooting using Jenkins extremely straightforward. You may assess run timing and find the slowest step utilizing the time stamper plugin, allowing you to tweak the performance of each operation.

Step 2: Creating a Pipeline

You can create your CI/CD code libraries, which can be referenced in your pipeline script. In addition, the extended shared libraries will allow you to write custom groovy code for more flexibility. I recommend using only a declarative pipeline for all your Jenkins-based CI/CD workflows, as you will have more control and customization over your pipelines. You have some extra options such as full stage view, that lets you view the stages a s whole. Click on build view and once the processing gets completed you can see the logs for all the stages that have been completed.