Top Jenkins Interview Questions

Jenkins Interview Questions: Jenkins is an open-source tool for automating the software development process. It can be used with multiple programming languages and can also manage a wide range of projects, from large software applications to websites and even mobile apps. Although it’s always changing, it has been around for quite some time. The following are Jenkins interview questions you might be asked during recruitment.

A Jenkins Interview Question is an important part of any job interview. It helps you assess your potential employer’s level of interest in hiring you. This article lists some key questions that a company should ask at the end of a job interview to better understand their candidate’s suitability for the role.

Jenkins Interview Questions For DevOps

• Which tool have you used to implement CI/CD?
• Do you know of any alternate tool for CI/CCD?
• What is Continuous Integration?
• What type of jobs have you configured in Jenkins?
• What are the types of jobs are available in Jenkins?
• What is the difference b/w freestyle and pipeline?
• What is the pipeline?
• What is a declarative pipeline?
• What is the difference between a declarative pipeline and a script-based pipeline?
• Write the pipeline syntax.
• What is a master/slave architecture? what is the use of master/slave?
• How many we can connect the slaves?
• How many ways can we provide security for your Jenkins server?
• What is sonarqube? Have you configured it? How do you configure it?
• What type of artifactory repository tool have you used?
• What is the use of artifactory tools?
• How do you declare a variable in the pipeline?
• What is a DSL language? domain-specific language?
• What are upstream/downstream projects? what is the use of it? which scenario do you configure?
• If you have 10 repositories in Github, how many jobs can you configure?
• Do you have the experience to install?
• How do you configure JDK, maven, Gradle…etc?
• I have a different version for Java implementation projects in my environment. Is there one? How do you configure multiple JDKs?
• What are the plugins have you used in your project?
• How to take back up my Jenkins? thin backup plugin
• What is Jenkins Home Directory?
• How to delete old builds automatically?
• How to configure multiple environment deployments?
• Command to start Jenkins server?
• How will schedule the job be executed every 1 hour?

Jenkins Interview Questions For Testers

Regarding Jenkins interview questions, this article will start with an Introduction to Continuous Integration & Continuous Deployment and the role Jenkins plays as an automation tool in the SDLC.

• What is Jenkins?
• What is the difference between Maven, Ant, and Jenkins?
• Which SCM tools does Jenkins support?
• What are the various ways in which a build can be scheduled in Jenkins?
• What is the relationship between Hudson and Jenkins?
• What do you do to ensure your project build doesn’t break in Jenkins?
• What do you do when you see a broken build for your project in Jenkins?
• Mention Jenkins?
• Explain what continuous integration is.
• What is the requirement for using Jenkins?
• Mention what are the advantages of Jenkins.
• Explain how you can move or copy Jenkins from one server to another.
• Mention the commands you can use to start Jenkins manually.
• Mention some of the useful plugins in Jenkin.
• Explain how you can deploy a custom build of a core plugin.
• Explain how you can create a backup and copy files in Jenkins.
• Explain how you can clone a Git repository via Jenkins.
• Explain how you can set up Jenkins’s job.
• Mention the two components with which Jenkins is mainly integrated.
• What is the difference between Maven, Ant, and Jenkins?
• Which SCM tools does Jenkins support?
• What are the various ways in which a build can be scheduled in Jenkins?
• What is the relationship between Hudson and Jenkins?
• What do you do to ensure your project build doesn’t break in Jenkins?
• What do you do when you see a broken build for your project in Jenkins?
• How to create a backup and copy files in Jenkins?
• How can you clone a Git repository via Jenkins?
• How can you set up Jenkins jobs?
• What are the two components with which Jenkins is mainly integrated?
• How can you move or copy Jenkins from one server to another?
• Jenkins Cron’s job is to set at every hour how.
• Apart from Jenkins, what ci/cd tool can you use?
• How to pass parameters in Jenkins.
• What is Jenkins? And explain its use?
• How to set the proxy in Jenkins
• What is Jenkins?
• Tell me something about Continuous Integration, Continuous Delivery, and Continuous Deployment.
• What are the common use cases for which Jenkins is used?
• What are the ways to install Jenkins?
• What is a Jenkins job?
• What is a Jenkins Pipeline?
• What are the types of Jenkins pipelines?
• Explain Jenkins Multibranch Pipeline.
• How do you store credentials in Jenkins securely?
• How can we stop a scheduled job from being executed temporarily?
• What are the ways to trigger a Jenkins Job/Pipeline?
• What is Jenkins Build Cause?
• How does Jenkins know when to execute a Scheduled job/pipeline, and how is it triggered?
• What are the credential types supported by Jenkins?
• What are the Scopes of Jenkins Credentials?
• What is a Jenkins Shared Library, and how is it useful?
• How can Jenkins jobs be Triggered/Stopped/Controlled programmatically?
• How do I get the Jenkins version programmatically in Jobs/Pipelines or nodes other than the master?
• What happens when a Jenkins agent is offline, and what is the best practice for that situation?
• What is the Blue Ocean?
• What is the Jenkins User Content service?
• How is continuous integration achieved using Jenkins?
• What is Artifact Archival & how can it be done in Pipelines?
• How to configure inclusions & exclusions in Artifacts Archival?
• How can we share information between different build steps or stages in a Jenkins Job?
• How is code coverage measured/tracked using Jenkins in a CI environment?
• Default Environment Variables by Jenkins & How do you introduce custom environment variables?
• How can a job configuration be reset to an earlier version/state?
• How do you configure Global Tools in Jenkins?
• How to create & use a Shared Library in Jenkins?
• How do you install a Custom Jenkins Plugin or a Version of the Plugin Not available in the Jenkins Update Center?
• How to download the Console log for a particular Jenkins build programmatically?
• What is Jenkins Remote Access API?
• What is In-process Script Approval, and how does it work?
• Can we monitor Jenkins using common Observability tools?
• What is a Ping Thread in Jenkins, and how it works

Jenkins Interview Questions And Answers

• What is Jenkins
• What is the difference between Jenkins and Hudson
• What SCM tools does Jenkins support
• How can you tell what version of Jenkins you are using?
• What is continuous integration in Jenkins
• What are the pre-requisites for using Jenkins
• How can you move or copy Jenkins from one server to another server
• Commands to use to start Jenkins manually
• What are the most useful plugins in Jenkins
• How to create a Jenkins job, and what are the types
• What are the two components that Jenkins mainly integrates with?
• What is the default session timeout value in Jenkins, and how can you increase it?
• Explain about Jenkin’s security mechanism
• How can you pass parameters from one job to another job in Jenkins?
• Explain about building a pipeline in Jenkins
• How can someone execute the jobs in Jenkins without having permission to do so?
• How to re-execute a parameterized build job without entering the parameter values when the job fails? Note: The job should not ask for parameters, and it should run with the values of parameters that you entered during the previous execution
• How to install plugins in Jenkins
• How can configure slaves/nodes in Jenkins
• How to run jobs for slaves

Jenkins Real-Time Interview Questions

• What is Jenkins?
• Why do we use Jenkins?
• What are the other tools/technologies present in the market other than Jenkins for CI/CD?
• How to move Jenkins from one server to another?
• What are plugins in Jenkins?
• What are the default plugins installed in Jenkins?
• How to schedule builds in Jenkins?
• What is the difference between Ant, Maven, and Gradle?
• What is the difference between Jenkins, TeamCity, and Bamboo?
• How to configure cloud access in Jenkins?
• What are Jenkin’s slaves?
• How to run a groovy script in Jenkins?
• What is Jenkins Pipeline?
• What are the different types of Jenkins Pipeline?
• What is the Declarative Pipeline in Jenkins?
• Is Jenkins a CI tool or both CI/CD?
• How do you install Jenkins with non-root access in Linux?
• If you have 200 employees in your company, how can you assign Jenkins access to each employee and give them permission in Jenkins?

Jenkins Scenario Based Interview Questions

• Task 1: Write the Jenkins pipeline code for Java & PHP application
• Task 2: Write the Jenkins file code to build a Java application with Maven with error handling
• Task 3: Complete the following tasks:
• Jenkins setup on Linux
• Set up an app server with Apache to deploy an app.
• create three jobs on Jenkins
• Pull the code from the git repo
• Build the application
• deploy an app on Apache using Ansible.
• app deploy should work with single trigger hit(git pull job -> build an app -> deploy on an apache server)
  the job should get triggered on git push on the git repo

Conclusion:

The Jenkins Interview Questions blog post is a collection of the most frequently asked questions and answers from candidates interviewed for the role of Jenkins questions. You can use this list to brush up on your interview skills or just look at the questions and their answers for some good advice.