What is Jenkins? (Jenkins For Continuous Integration)

Jenkins is a self-contained Java program that automates continuous integration (CI) builds. It integrates with GitHub, triggers builds based on notification hooks from your SCM, and automates the final step of deploying the code to its final destination. The following sections provide an overview of Jenkins and the different ways it can help you with your CI efforts. Let's get started!

 

What is Jenkins and why we use it?

Jenkins is a self-contained Java program

Jenkins for Continuous Integration is a powerful and open-source automation tool that allows developers to automate the entire development process, from testing to deploying software to its final destination.

This tool is widely used in software development and has more than 16,000 stars on GitHub. Thousands of software companies use Jenkins for Continous Integration.

The Jenkins server automates the entire software delivery process from code development to release, and its plugins are easy-to-use and extensible.

In recent years, the demand for dependable applications has grown exponentially. To keep up with this demand, organizations need systems that support and drive their operations.

To meet this need, organizations turn to their in-house development teams.

To create dependable applications, Jenkins acts as a faithful servant. It automatically runs predefined jobs after each commit.

Moreover, it detects and reports any issues that may arise with a given commit.

This open-source CI tool was originally developed by Kohsuke Kawaguchi, a developer at Sun Microsystems.

His original purpose was to build a continuous integration tool that could catch bugs in code before it is submitted for review.

He then open-sourced the Hudson project and quickly gained a worldwide following.

Jenkins is a Java program that can run standalone or as a servlet on a Java application server. Jenkins produces a web interface and accepts calls to its REST API.

During installation, you can create an administrator user and a random password and paste this password into the Jenkins web interface.

You can also choose the plugins you want to use from the plugin directory.

The main advantage of Jenkins is that it can be distributed over multiple machines and can speed up tests, builds and deployments.

As a platform-agnostic self-contained Java program, Jenkins is free to download and runs on most platforms. It is available for installation through native system packages or Docker and is easy to use on any machine with a Java environment.

When it comes to building a project, Jenkins is commonly used. It executes tests for bugs, analyzes static code, and automates repetitive tasks to optimize developing processes.

You can host Jenkins on-premise or in the cloud. Jenkins provides many advantages of self-management.

It allows users to control when they want updates. It also helps reduce frustration when things go wrong because you can roll back to an earlier version.

With so many plugins available, Jenkins allows you to build and run your projects in the cloud without installing anything on site.

You can install and configure Jenkins on a Windows, Mac, or Unix machine in less than ten minutes.

One downside of Jenkins is that it often breaks continuous integration. It also requires developers to manually run tests for each build.

However, Jenkins' main advantage is that it automatically deploys builds into the Production Pipeline and User Acceptance Testing environments.

Jenkins uses a Selenium automation framework to automate UAT tests.

Once a build is complete, it deploys into the production pipeline and notifies developers about its success or failure.

 

It integrates with GitHub

If you're looking for a continuous integration solution that integrates with GitHub, Jenkins may be the perfect solution.

GitHub is the number one hosted version control system, providing a powerful web UI for developers and public repositories that are free to use.

It also provides a robust CI/CD solution through GitHub Actions, which integrates seamlessly into the GitHub platform. To use Jenkins, you'll need to install a plugin for GitHub.

Luckily, there are a number of plugins and integrations for Jenkins that make creating CI pipelines with Git a breeze.

Most of the plugins and integrations are easy to use and require only the setup of a few credentials. Many of them can be used to deploy infrastructure to cloud services and use Git as a repository.

There's a plugin for that, too. Just follow the instructions to install it.

To set up Jenkins for Continuous Integration with GitHub, you must first sign in to GitHub.

Then, you'll need to generate a personal access token, which you can get from the Developer Settings of your GitHub profile.

Jenkins will then ask for the secret text and generate an authentication token for you. You can also use your Jenkins ID and password to log in to GitHub.

Once you've successfully installed Jenkins, you can now use it to create and run your projects with ease.

 

It triggers builds based on notification hooks from SCM

A Jenkins for Continuous Integration job will be triggered based on notification hooks from SCM. Notification hooks are emailed to Jenkins whenever a change is made to a project in SCM.

Alternatively, you can trigger a build manually using the ‘Build Now' option or ‘Build with Parameter'. With the latter option, Jenkins will trigger a build automatically whenever a change is made to a project in SCM.

In Jenkins, jobs must be configured to run only on specific branches of a busy repository.

However, if many builds are triggered at the same time, a Jenkins job may only be triggered once.

The resulting failure will result in a single build. If Jenkins encounters a problem when running the job, you can use a configuration variable that specifies a unique value for each webhook triggered by the job.

A Jenkins job will trigger when a GitLab change is pushed. To add this trigger, configure the GitHub plugin's “gitlab-webhook”.

To add a notification hook, configure the URL for the webhook manually automatically. Jenkins also offers authentication and has a built-in mechanism to avoid a rogue build.

You can also configure a Jenkins job to use GitLab webhooks and GitHub webhooks.

 

It automates the final step of deploying the code to its final destination

Using Jenkins for Continuous Integration is a good way to automate the final deployment step of the code.

It's also a great way to keep your code and project up-to-date without having to manually do this step. Jenkins can be configured to use various plugins and personal access tokens to protect your data.

Because Jenkins is built on an older Java technology stack, it relies on servlets and Maven. You can use Docker to package the Jenkins code, servlet middleware, and other tools that are important for your project.

By using Jenkins, you no longer have to worry about deploying to different environments because you'll never have to manually push updates or deploy the code to another location.

 

It integrates with PHP tools

The Jenkins for Continuous Integration tool for PHP is an open source continuous integration server that supports virtually any project.

As an open source tool, Jenkins has a vibrant plugin ecosystem that supports many different projects.

The PHP template for Jenkins has been heavily inspired by the work of Sebastian Bergmann.

Once you have installed all the required PHP tools, you can start integrating your projects with Jenkins.

 

It supports many languages besides Java

For the most part, Jenkins for Continuous Integration (CI) supports Java. Because Jenkins is a self- contained Java program, it can be easily installed and configured on most operating systems.

The web interface makes it easy to configure the software.

It also offers a number of plugins to customize its functionality.

Jenkins for Continuous Integration equally supports many languages, including Python and Ruby. It also supports a wide range of code repositories and languages.

This makes the tool a great choice for organizations that use multiple programming languages. It does not require building any Python code unless you are using Cython.

It also integrates with Python reporting and testing tools. Similarly, Jenkins supports Ruby code quality tools like Rake, Cucumber, and Brakeman.

With so many plug-ins, it's easy to get started with Jenkins without much training. One of the greatest benefits of Jenkins for Continuous Integration is its ease of use.

If you're using Java for your project, you'll want to install the corresponding JDK. JDK stands for Java SE Development Kit. It comes in both 32-bit and 64-bit configurations.

You can add JDK to the System Environment variable JAVA_HOME, pointing to the location of your JDK installation.

The JRE is short for Java Runtime Environment.

 

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