Hello guys, if you are preparing for Java developer interview or DevOps Interview, one tool which you should know well is Jenkins, the king of Continuous Integration and Continuous build, and one of the most desirable skill companies look on experienced programmers now a days. Earlier, I have shared best free Jenkins courses for programmers to learn this useful tool as well as Interview questions on DevOps, Docker, and Kubernetes and in this article, I am going to share 20 frequently sked Jenkins and CI/CD Interview questions with answers for both beginners and experienced developers. But, Before I get to the top 20 Jenkins interview questions that will definitely help you land your dream job, let me tell you a bit more about what Jenkins really is. Simply put, Jenkins is one of the most widely-used Continuous Integration tools available in the market today. Similar to Ansible, Jenkins is basically an open-source automation tool that can be written in Java along with other plug-ins built for the purpose of Continuous Integration. 20 Jenkins and CI/CD Interview Questions with Answers Jenkins can be used for building and testing your software projects continuously. This means that it is very easy for developers to integrate new changes into the project. It is also pretty easy for users to obtain a fresh build. Jenkins gives you the ability to continuously deliver your software by way of integrating with a wide variety of testing and deployment technologies. Companies can use Jenkins to accelerate the software development process with the help of automation. It can integrate development life-cycle processes including build, document, test package, stage, deploy, and static analysis. Here we have compiled a list of the top 20 Jenkins interview questions along with answers that will help you land your dream job. Keep reading to find out more. 1. What can you tell us about Jenkins? Jenkins is one of the most widely-used Continuous Integration tools available in the market today. Similar to Ansible, Jenkins is basically an open-source automation tool that can be written in Java along with other plug-ins built for the purpose of Continuous Integration. 2. What are the key features of Jenkins? For starters, Jenkins is absolutely free as it is an open-source automation tool. It has a wide variety of plug-ins. It is also very easy to install and set up on multiple computers. 3. What is Groovy in Jenkins? Apache Groovy is basically a dynamic and object-oriented programming language that can be used as a scripting language for Java platforms. 4. How can you install Jenkins? First, you need to install Java. Then you need to install the Apache Tomcat server before proceeding to install the Jenkins war file. Finally, you need to deploy the Jenkins war file. 5. What commands can be used to start Jenkins? You should open the command prompt before navigating to the directory where the Jenkins war file is present. Then, you can run the start command. 6. What are the uses of Jenkins? Jenkins can be used for building and testing your software projects continuously. This means that it is very easy for developers to integrate new changes into the project. It is also pretty easy for users to obtain a fresh build. Jenkins gives you the ability to continuously deliver your software by way of integrating with a wide variety of testing and deployment technologies. 7. What can you tell us about Continuous Integration and Continuous Development? Continuous Interrogation can be used for streamlining the development as well as the deployment process. Continuous Delivery refers to the process where your code, after being pushed to a remote repository, can be taken to production whenever you want. 8. What can you tell us about a CI/CD pipeline? A CI/CD Pipeline is considered the backbone of the DevOps approach. It is useful for building codes, running tests, as well as deploying new versions of software. 9. Explain a Jenkins Pipeline. A Jenkins pipeline is basically a set of plug-ins that can support the implementation and integration of all the continuous delivery pipelines into Jenkins. 10. How do big companies use Jenkins? Companies can use Jenkins to accelerate the software development process with the help of automation. It can integrate development life-cycle processes including build, document, test package, stage, deploy, and static analysis. 11. What are some of the different types of pipelines in Jenkins? There are three types of pipelines in Jenkins. CI/CD Pipeline, Scripted pipeline, and a Declarative pipeline. 12. What should you do to set up a Jenkins job? First, you should select a New Item from the Menu. You can enter a name for the job and select a freestyle job. Then, click OK to create the new job. 13. What are the requirements for running Jenkins? You should have a source code repository that can be accessed, like a Git repository. You should also have a build script like Maven. 14. What are the two components Jenkins is most frequently integrated with? Jenkins is mostly integrated with version control systems like Git or SVN. It can also be integrated with build tools like Maven. 15. What are some of the useful plug-ins in Jenkins? Some of the most popular Jenkins plug-ins are Maven 2 Project, Amazon EC2, Copy artifact, Join, HTML Publisher, and Green Balls. 16. How do you back up files in Jenkins? Jenkins can store all the settings, build scripts, as well as logs in the home directory. You can create a backup of this Jenkins setup by copying this directory. 17. How do you copy files in Jenkins? The job directory can be copied to clone a particular job. You can also rename the directory itself. 18. What are some Continuous Integration tools other than Jenkins? Some of the most famous Continuous Integration tools are Team City, Travis CI, Go CD, Bamboo, GitLab CI, Circle CI, and Code Ship. 19. What will you do if the first job you do in a pipeline is successful, but the second one fails? You can basically restart the pipeline from that exact point where it failed by clicking on Restart From Stage. 20. What is a Jenkinsfile? It is simply a text file that contains a definition of a Jenkins file. It can also be checked into the source control repository. That's all about the 20 Jenkins and CI/CD Interview Questions for Java developers. I have tried to cover as many essential topics and concepts as possible like what is CI/CD, how they help and how to create Jenkins pipeline for deployment in test and production etc. If you liked this list of the top 20 Jenkins interview questions with answers, feel free to share it with your friends and family. I have no doubt that the questions in this list will transform you from a complete beginner to a Jenkins expert within a matter of weeks or months. There are a wide variety of questions in this list that will be beneficial to both absolute beginners as well as intermediate-level learners. You can also drop a comment if you have any doubts about Jenkins, and we will get back to you as soon as possible. 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All the best for your DevOps interviews and if you have any questions which don't know answer or any doubt feel free to ask in comments. P. S. - If you are keen to learn more about Jenkins and CI/CD in general and looking for resources then you can also checkout this list of best Jenkins online courses to start with. In this list, I have shared best online courses to learn Jenkins and Continuous Integration and Continuous delivery.