Research and Use Case of Jenkins

→ What is Jenkins ?

Jenkins is a free and open source automation server. 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. The leading open source automation server, Jenkins provides hundreds of plugins to support building, deploying and automating any project.

Jenkins is an open-source automation tool written in Java with plugins built for Continuous Integration purposes. Jenkins is used to build and test your software projects continuously making it easier for developers to integrate changes to the project, and making it easier for users to obtain a fresh build.

→ Why Jenkins ?

There are a number of advantages in using Jenkins while developing software, some of them are mentioned below:

1. Easy to use
2. The user interface is simple and intuitive
3. Extremely flexible and easy to adapt to your purposes
4. It has over 1000 plugins supporting communication, integration, and testing to numerous external applications and if the plugin is not available, you can easily create one.
5. It has a simple configuration through a web-based GUI, which speeds up job creation, improves consistency and decreases the maintenance costs.
6. Allows consistent scripting across operating systems.
7. The Jenkins tool is written in Java and thus it can be portable to most of the major platforms.

Continuous Integration

Before jumping into Jenkins, one should have a clear concept of Continuous Integration (CI). Continuous Integration can be said as the cornerstone of the software development process and is used to integrate various DevOps stages. It forces the defects in a software cycle to emerge early rather than waiting for software to be fully produced.

Continuous Integration basically involves making small changes to software and the building as well as applying quality assurance processes. Using the Jenkins tool in CI allows the code to build, deployed and tested automatically without many efforts.

Why Use It

1. Faster Development
2. Better Software Quality
3. Easily Customisable
4. Effortless Auditing Of Previous Run
5. Large Community.

EndNote

Though Jenkins has been used and appraised positively by the users for many years now, it also shows limitations sometimes. Limitations such as service instability in continuous integration, its configurations where upgrading or any changes cause breaks, etc. have been faced by the developers.

→ How Industry Use Jenkins ?

→ Case Study — Netflix

Netflix is a streaming service that offers a wide variety of award-winning TV shows, movies, anime, documentaries, and more on thousands of internet-connected devices. So Netflix greatly uses Jenkins for its use case. Once a line of code has been built and tested locally using Nebula, it is ready for continuous integration and deployment. The first step is to push the updated source code to a git repository. Teams are free to find a git workflow that works for them.

Once the change is committed, a Jenkins job is triggered. Netflix’s use of Jenkins for continuous integration has evolved over the years. They started with a single massive Jenkins master in their datacenter and have evolved to running 25 Jenkins masters in AWS. Jenkins is used throughout Netflix for a variety of automation tasks above just simple continuous integration.

A Jenkins job is configured to invoke Nebula to build, test and package the application code. If the repository being built is a library, Nebula will publish the .jar to our artifact repository. If the repository is an application, then the Nebula os package plugin will be executed.

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