Advanced Jenkins Interview Questions And Answers

Top 25 Jenkins Interview Questions And Answers For Experienced 2018. If you are looking for Jenkins interview questions with answers, then you are at right place. Here coding  compiler presenting a list of 25 real-time interview questions on Jenkins. These Jenkins interview questions for devops will help you to crack your next Jenkins job interview. Happy reading and all the best for your future.

Jenkins Interview Questions

  1. What is Jenkins?
  2. Why do we use Jenkins?
  3. What is Maven and what is Jenkins?
  4. What is the difference between Hudson and Jenkins?
  5. What is meant by continuous integration in Jenkins?
  6. Why do we use Jenkins with selenium?
  7. What are CI Tools?
  8. What is a CI CD pipeline?
  9. What is build pipeline in Jenkins?
  10. What is a Jenkins pipeline?
  11. What is a DSL Jenkins?
  12. What is continuous integration and deployment?
  13. What is the tool used for provisioning and configuration?
  14. What is the difference between Maven, Ant and Jenkins?
  15. Which SCM tools Jenkins supports?
  16. How schedule a build in Jenkins?
  17. Why do we use Pipelines in Jenkins?
  18. What is a Jenkinsfile?
  19. How do you create Multibranch Pipeline in Jenkins?
  20. What is blue ocean in Jenkins?
  21. What are the important plugins in Jenkins?
  22. What are Jobs in Jenkins?
  23. How do you create a Job in Jenkins?
  24. How do you configuring automatic builds in Jenkins?
  25. How to create a backup and copy files in Jenkins?

Jenkins Interview Questions And Answers

Jenkins Interview Questions # 1) What is Jenkins?

Answer # Jenkins is an open source automation server. Jenkins ia a continuous integration tool developed in Java. Jenkins helps to automate the non-human part of software development process, with continuous integration and facilitating technical aspects of continuous delivery.

 

Jenkins Interview Questions # 2) Why do we use Jenkins?

Answer # Jenkins is an open-source continuous integration software tool written in the Java programming language for testing and reporting on isolated changes in a larger code base in real time. The Jenkins software enables developers to find and solve defects in a code base rapidly and to automate testing of their builds.

 

Jenkins Interview Questions # 3) What is Maven and what is Jenkins?

Answer # Maven is a build tool, in short a successor of ant. It helps in build and version control. However, Jenkins is continuous integration system, where in maven is used for build. Jenkins can be used to automate the deployment process.

 

Jenkins Interview Question # 4) What is the difference between Hudson and Jenkins?

Answer # Jenkins is the new Hudson. It really is more like a rename, not a fork, since the whole development community moved to Jenkins. (Oracle is left sitting in a corner holding their old ball “Hudson“, but it’s just a soul-less project now.). In a nutshell Jenkins CI is the leading open-source continuous integration server.

 

Jenkins Interview Questions # 5) What is meant by continuous integration in Jenkins?

Answer # Continuous integration is a process in which all development work is integrated as early as possible. The resulting artifacts are automatically created and tested. This process allows to identify errors as early as possible. Jenkins is a popular open source tool to perform continuous integration and build automation.

 

Jenkins Interview Questions # 6) Why do we use Jenkins with selenium?

Answer # Running Selenium tests in Jenkins allows you to run your tests every time your software changes and deploy the software to a new environment when the tests pass. Jenkins can schedule your tests to run at specific time.

 

Jenkins Interview Questions # 7) What are CI Tools?

Answer # Here is the list of the top 8 Continuous Integration tools:

  • Jenkins
  • TeamCity
  • Travis CI
  • Go CD
  • Bamboo
  • GitLab CI
  • CircleCI
  • Codeship

 

Jenkins Interview Questions # 8) What is a CI CD pipeline?

Answer # A continuous integration and deployment pipeline (CD/CI) is such an important aspect of a software project. It saves a ton of manual, error-prone deployment work. It results in higher quality software for continuous integration, automated tests, and code metrics.

 

Jenkins Interview Questions # 9) What is build pipeline in Jenkins?

Answer # Job chaining in Jenkins is the process of automatically starting other job(s) after the execution of a job. This approach lets you build multi-step build pipelines or trigger the rebuild of a project if one of its dependencies is updated.

 

Jenkins Interview Questions # 10) What is a Jenkins pipeline?

Answer # The Jenkins Pipeline plugin is a game changer for Jenkins users. Based on a Domain Specific Language (DSL) in Groovy, the Pipeline plugin makes pipelines scriptable and it is an incredibly powerful way to develop complex, multi-step DevOps pipelines.

Jenkins Interview Questions And Answers For Experienced

Jenkins Interview Questions # 11) What is a DSL Jenkins?

Answer # The Jenkins “Job DSL / Plugin” is made up of two parts: The Domain Specific Language (DSL) itself that allows users to describe jobs using a Groovy-based language, and a Jenkins plugin which manages the scripts and the updating of the Jenkins jobs which are created and maintained as a result.

 

Jenkins Interview Questions # 12) What is continuous integration and deployment?

Answer # Continuous Integration (CI) is a development practice that requires developers to integrate code into a shared repository several times a day. Each check-in is then verified by an automated build, allowing teams to detect problems early.

 

Jenkins Interview Questions # 13) What is the tool used for provisioning and configuration?

Answer # Ansible is an agent-less configuration management as well as orchestration tool. In Ansible, the configuration modules are called “Playbooks”. Like other tools, Ansible can be used for cloud provisioning.

 

Jenkins Interview Questions # 14) What is the difference between Maven, Ant and Jenkins?

Answer # Maven and ANT are build tool but main difference is that maven also provides dependency management, standard project layout and project management. On difference between Maven, ANT and Jenkins, later is a continuous integration tool which is much more than build tool.

 

Jenkins Interview Questions # 15) Which SCM tools Jenkins supports?

Answer # Jenkins supports version control tools, including AccuRev, CVS, Subversion, Git, Mercurial, Perforce, ClearCase and RTC, and can execute Apache Ant, Apache Maven and sbt based projects as well as arbitrary shell scripts and Windows batch commands.

Jenkins Interview Questions For Testers

Jenkins Interview Questions # 16) How schedule a build in Jenkins?

Answer # In Jenkins, under the job configuration we can define various build triggers. Simple find the ‘Build Triggers’ section, and check the ‘ Build Periodically’ checkbox. With the periodically build you can schedule the build definition by the date or day of the week and the time to execute the build.

The format of the ‘Schedule’ textbox is as follows:

MINUTE (0-59), HOUR (0-23), DAY (1-31), MONTH (1-12), DAY OF THE WEEK (0-7)

 

Jenkins Interview Questions # 17) Why do we use Pipelines in Jenkins?

Answer # Pipeline adds a powerful set of automation tools onto Jenkins, supporting use cases that span from simple continuous integration to comprehensive continuous delivery pipelines. By modeling a series of related tasks, users can take advantage of the many features of Pipeline:

  • Code: Pipelines are implemented in code and typically checked into source control, giving teams the ability to edit, review, and iterate upon their delivery pipeline.
  • Durable: Pipelines can survive both planned and unplanned restarts of the Jenkins master.
  • Pausable: Pipelines can optionally stop and wait for human input or approval before continuing the Pipeline run.
  • Versatile: Pipelines support complex real-world continuous delivery requirements, including the ability to fork/join, loop, and perform work in parallel.
  • Extensible: The Pipeline plugin supports custom extensions to its DSL and multiple options for integration with other plugins.

Jenkins Interview Questions # 18) What is a Jenkinsfile?

Answer # A Jenkinsfile is a text file that contains the definition of a Jenkins Pipeline and is checked into source control.

Creating a Jenkinsfile, which is checked into source control, provides a number of immediate benefits:

  1. Code review/iteration on the Pipeline
  2. Audit trail for the Pipeline
  3. Single source of truth for the Pipeline, which can be viewed and edited by multiple members of the project.

Jenkins Interview Questions # 19) How do you create Multibranch Pipeline in Jenkins?

Answer # The Multibranch Pipeline project type enables you to implement different Jenkinsfiles for different branches of the same project. In a Multibranch Pipeline project, Jenkins automatically discovers, manages and executes Pipelines for branches which contain a Jenkinsfile in source control.

 

Jenkins Interview Questions # 20) What is blue ocean in Jenkins?

Answer # Blue Ocean is a project that rethinks the user experience of Jenkins, modelling and presenting the process of software delivery by surfacing information that’s important to development teams with as few clicks as possible, while still staying true to the extensibility that is core to Jenkins.

 

Jenkins Interview Questions # 21) What are the important plugins in Jenkins?

Answers # Here is the list of some important Plugins in Jenkins:

  1. Maven 2 project
  2. Git
  3. Amazon EC2
  4. HTML publisher
  5. Copy artifact
  6. Join
  7. Green Balls

 

Jenkins Interview Questions # 22) What are Jobs in Jenkins?

Answer # Jenkins can be used to perform the typical build server work, such as doing continuous/official/nightly builds, run tests, or perform some repetitive batch tasks. This is called “free-style software project” in Jenkins.

 

Jenkins Interview Questions # 23) How do you create a Job in Jenkins?

Answer # Go to Jenkins top page, select “New Job”, then choose “Build a free-style software project”. This job type consists of the following elements:

optional SCM, such as CVS or Subversion where your source code resides.
optional triggers to control when Jenkins will perform builds.

some sort of build script that performs the build (ant, maven, shell script, batch file, etc.) where the real work happens optional steps to collect information out of the build, such as archiving the artifacts and/or recording javadoc and test results.

optional steps to notify other people/systems with the build result, such as sending e-mails, IMs, updating issue tracker, etc.

 

Jenkins Interview Questions # 24) How do you configuring automatic builds in Jenkins?

Answer # Builds in Jenkins can be triggered periodically (on a schedule, specified in configuration), or when source changes in the project have been detected, or they can be automatically triggered by requesting the URL:

http://YOURHOST/jenkins/job/PROJECTNAME/build

 

Jenkins Interview Questions # 25) How to create a backup and copy files in Jenkins?

Answer # To create a backup, all you need to do is to periodically back up your JENKINS_HOME directory. This contains all of your build jobs configurations, your slave node configurations, and your build history. To create a back-up of your Jenkins setup, just copy this directory.

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