Jenkins

Jenkins. Jenkins is an open-source continuous integration tool developed by Kohsuke Kawaguchi and CloudBees, with contributions from Oracle Corporation, Google, and Microsoft. It is widely used in DevOps environments, such as those at Amazon Web Services, Red Hat, and IBM, to automate build, test, and deployment processes. Jenkins integrates with various tools, including Git, Subversion, and Mercurial, to support agile development methodologies like Scrum and Kanban.

Overview

Jenkins is a Java-based application that runs on a Java Virtual Machine and supports cross-platform deployment on Windows, Linux, and macOS operating systems. It is used by organizations like Netflix, Etsy, and NASA to automate continuous delivery pipelines, ensuring faster time-to-market and improved software quality. Jenkins provides a web-based interface, similar to Apache Tomcat and JBoss Application Server, for configuring and monitoring build jobs and test suites. It also integrates with Docker and Kubernetes to support containerization and orchestration of microservices-based applications.

Architecture

The Jenkins architecture is based on a master-slave model, where a central Jenkins master node coordinates the execution of build jobs and test suites on multiple Jenkins slave nodes. This architecture is similar to those used in Hadoop and Apache Spark clusters, where a central node manages the distribution of tasks across multiple worker nodes. Jenkins uses a plugin-based architecture, allowing developers to extend its functionality with custom plugins, such as those for Amazon S3 and Google Cloud Storage. The Jenkins core is built using Java and Apache Commons libraries, with a web interface based on JavaScript and HTML5.

Features

Jenkins provides a range of features for automating continuous integration and continuous delivery processes, including support for source code management systems like Git and Subversion. It also includes features for build automation, such as Maven and Gradle integration, and test automation, such as JUnit and TestNG support. Jenkins provides a dashboard for monitoring build jobs and test suites, with features like real-time updates and email notifications. It also integrates with project management tools like Jira and Asana to support agile development methodologies.

Plugins and extensibility

Jenkins has a large ecosystem of plugins, with over 1,000 plugins available for extending its functionality. These plugins include support for cloud platforms like Amazon Web Services and Microsoft Azure, as well as containerization tools like Docker and Kubernetes. Jenkins also provides a plugin development kit (PDK) for developers to create custom plugins, using languages like Java and Python. The Jenkins plugin ecosystem is similar to those found in Eclipse and NetBeans, where a large community of developers contributes to the development of plugins and extensions.

Usage and applications

Jenkins is widely used in DevOps environments to automate continuous integration and continuous delivery processes. It is used by organizations like Google, Facebook, and Netflix to support agile development methodologies and improve software quality. Jenkins is also used in research institutions like MIT and Stanford University to support scientific computing and data analysis applications. It integrates with tools like RStudio and Jupyter Notebook to support data science and machine learning workflows.

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History and development

Jenkins was originally developed by Kohsuke Kawaguchi in 2004, while working at Sun Microsystems. It was initially called Hudson and was later renamed to Jenkins in 2011, after a dispute over the Hudson trademark. Jenkins is now maintained by the Jenkins project and is supported by a large community of developers and users, including CloudBees, Red Hat, and IBM. The Jenkins project is hosted on GitHub and uses Apache License 2.0 for its open-source distribution. Jenkins has won several awards, including the Bossie Award and the Jolt Award, for its contributions to the DevOps and continuous integration communities. Category:Software