Jenkins Interview Questions and Answers, Jenkins Interview Questions and Answers Freshers, Jenkins Interview Questions and Answers, Jenkins Interview Questions

Before getting on to the Jenkins interview questions, the student must know that the Jenkins is a continuously varying field which needs the students as well as professionals to upgrade their skills with the new features and knowledge, to get fit for the jobs associated with Jenkins. This post related to Jenkins Interview Questions and Answers, Jenkins Interview Questions and Answers Freshers, Jenkins Interview Questions and Answers, Jenkins Interview Questions will help you let out find all the solutions that are frequently asked in you upcoming Jenkins interview.

Over thousands of vacancies available for the Jenkins developers, experts must be acquaintance with all the component of Jenkins technologies. This is necessary for the students in order to have in-depth knowledge of the subject so that they can have best employment opportunities in the future. Knowing every little detail about Jenkins is the best approach to solve the problems linked with problem.

APTRON has spent hours and hours in researching about the Jenkins Interview Questions and Answers, Jenkins Interview Questions and Answers Freshers, Jenkins Interview Questions and Answers, Jenkins Interview Questions that you might encounter in your upcoming interview.  All these questions will alone help you to crack the interview and make you the best among all your competitors.

First of all, let us tell you about how the Jenkins technology is evolving in today’s world and how demanding it is in the upcoming years. In fact, according to one study, most of the companies and businesses have moved to the Jenkins. Now, you cannot predict how huge the future is going to be for the people experienced in the related technologies.

Hence, if you are looking for boosting up your profile and securing your future, Jenkins will help you in reaching the zenith of your career. Apart from this, you would also have a lot of opportunities as a fresher.

These questions alone are omnipotent. Read and re-read the questions and their solutions to get accustomed to what you will be asked in the interview. These Jenkins interview questions and answers will also help you on your way to mastering the skills and will take you to the giant world where worldwide and local businesses, huge or medium, are picking up the best and quality Jenkins professionals.

This ultimate list of best Jenkins interview questions will ride you through the quick knowledge of the subject and topics like Continuous Integration and Jenkins, Installing and Running Jenkins. This Jenkins interview questions and answers can be your next gateway to your next job as a Jenkins expert.

These are very Basic Jenkins Interview Questions and Answers for freshers and experienced both.

Q1: Mention what is Jenkins?
A1: Jenkins is an open source tool with plugin built for continuous integration purpose. The principle functionality of Jenkins is to keep a track of version control system and to initiate and monitor a build system if changes occur. It monitors the whole process and provides reports and notifications to alert.

Q2: What is the requirement for using Jenkins?
A2: To use Jenkins you require

  • A source code repository which is accessible, for instance, a Git repository
  • A working build script, e.g., a Maven script, checked into the repository

Q3: Explain how you can move or copy Jenkins from one server to another?

  • Slide a job from one installation of Jenkins to another by copying the related job directory
  • Make a copy of an already existing job by making clone of a job directory by a different name
  • Renaming an existing job by renaming a directory.

Q4: Mention some of the useful plugins in Jenkin?
A4: Some of the important plugins in Jenkin includes

  • Maven 2 project
  • Amazon EC2
  • HTML publisher
  • Copy artifact
  • Join
  • Green Balls

Q5: Explain how you can clone a Git repository via Jenkins?
A5: To clone a Git repository via Jenkins, you have to enter the e-mail and user name for your Jenkins system. For that, you have to switch into your job directory and execute the “git config” command.

Q6: Mention what are the two components Jenkins is mainly integrated with?
A6: Jenkin is mainly integrated with two components

  • Version Control system like GIT, SVN
  • And build tools like Apache Maven.

Q7: What are the benefits of using Jenkins?
A7: I will suggest you to include the following benefits of Jenkins, if you can recall any other benefit apart from the below mentioned points you can include that as well.

  • At integration stage, build failures are cached.
  • For each change in the source code an automatic build report notification is generated.
  • To notify developers about build report success or failure, it is integrated with LDAP mail server.
  • Achieves continuous integration agile development and test driven development.
  • With simple steps, maven release project is automated.
  • Easy tracking of bugs at early stage in development environment than production.

Q8: Mention what are the commands you can use to start Jenkins manually?
A8: To start Jenkins manually open Console/Command line, then go to your Jenkins installation directory. Over there you can use the below commands:

To start Jenkins: jenkins.exe start
To stop Jenkins: jenkins.exe stop
To restart Jenkins: jenkins.exe restart

Q9: Explain how to create a backup and copy files in Jenkins?
A9: 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. You can also copy a job directory to clone or replicate a job or rename the directory.

Q10: Explain how you can deploy a custom build of a core plugin?
A10: Below are the steps to deploy a custom build of a core plugin:

  • Stop Jenkins.
  • Copy the custom HPI to $Jenkins_Home/plugins.
  • Delete the previously expanded plugin directory.
  • Make an empty file called <plugin>.hpi.pinned.
  • Start Jenkins.

Q11: What are the various ways in which build can be scheduled in Jenkins?
A11: You can schedule a build in Jenkins in the following ways:

  • By source code management commits
  • After completion of other builds
  • Can be scheduled to run at specified time ( crons )
  • Manual Build Requests

Q12: What are the two components Jenkins is mainly integrated with?
A12: According to me Jenkins is mainly integrated with the following:

  • Version Control system like GIT,SVN.
  • Build tools like Apache Maven.

Q13: What Is The Requirement For Using Jenkins?
A13: For using Jenkins, you have to need a source code repository which is accessible. For example, a Git repository and a working build script, e.g., a Maven script, checked into the repository.

Q14: How To Make Sure That Your Project Builds Doesn’t Break In Jenkins?
A14: You must follow these steps to make sure that your project builds doesn’t break in Jenkins:

  • First, perform successful clean install on your local machine with all unit tests.
  • Check all your code changes.
  • Synchronize with repository to make sure that all required config and POM changes and any difference is checked into the repository.

Q15: How You Can Set Up Jenkins Job?
A15: To create a project that is handled via jobs in Jenkins. Select New item from the menu, once this done enter a name for the job and select free-style job. Then click OK to create new job in Jenkins. The next page enables you to configure your job.

Q16: What You Do When You See A Broken Build For Your Project In Jenkins?
A16: I will open the console output for the build and will try to see if any file changes were missed.
If not able to find the issue that way, Will clean and update my local workspace to replicate the problem on my local and will try to solve it.

Q17: What is Continuous Integration (CI)?
A17: Continuous integration (CI) is a software engineering practice in which isolated changes are immediately tested and reported on when they are added to a larger code base.

Continuous Integration (CI) is a development practice where developers integrate code into a shared repository frequently, preferably several times a day. Each integration can then be verified by an automated build and automated tests.

Q18: What is a Jenkins Pipeline?
A18: Jenkins Pipeline (or simply “Pipeline”) is a suite of plugins which supports implementing and integrating continuous delivery pipelines into Jenkins.

Q19: What is a Continuous delivery pipeline?
A19: A continuous delivery pipeline is an automated expression of your process for getting software from version control right through to your users and customers.

Q20: What is Declarative Pipeline in Jenkins?
A20: Declarative Pipeline is a relatively recent addition to Jenkins Pipeline [1] which presents a more simplified and opinionated syntax on top of the Pipeline sub-systems.

All valid Declarative Pipelines must be enclosed within a pipeline block, for example:

pipeline {
/* insert Declarative Pipeline here */

Q21: What is agent in Jenkins?
A21: The agent section specifies where the entire Pipeline, or a specific stage, will execute in the Jenkins environment depending on where the agent section is placed. The section must be defined at the top-level inside the pipeline block, but stage-level usage is optional.

Q22: What is post?
A22: The post section defines one or more additional steps that are run upon the completion of a Pipeline’s or stage’s run (depending on the location of the post section within the Pipeline).

post can support one of the following post-condition blocks: always, changed, failure, success, unstable, and aborted. These condition blocks allow the execution of steps within the post section depending on the completion status of the Pipeline or stage.

Q23: What are stages?
A23: Containing a sequence of one or more stage directives, the stages section is where the bulk of the “work” described by a Pipeline will be located. At a minimum it is recommended that stages contain at least one stage directive for each discrete part of the continuous delivery process, such as Build, Test, and Deploy.

Q24: What is Scripted Pipeline in Jenkins?
A24: Scripted Pipeline, like Declarative Pipeline, is built on top of the underlying Pipeline sub-system. Unlike Declarative, Scripted Pipeline is effectively a general purpose DSL [2] built with Groovy. Most functionality provided by the Groovy language is made available to users of Scripted Pipeline, which means it can be a very expressive and flexible tool with which one can author continuous delivery pipelines.

Q25: What is the difference between Hudson and Jenkins?
A25: 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.

Q26: Why do we use Jenkins with selenium?
A26: 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.

Q27: What are CI Tools?
A27: Here is the list of the top 8 Continuous Integration tools:

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

Q28: What is a DSL Jenkins?
A28: 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.

Q29: What is the tool used for provisioning and configuration?
A29: 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.

Q30: Which SCM tools Jenkins supports?
A30: 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.

Q31: What is blue ocean in Jenkins?
A31: 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 Conclusion Interview FAQs

We know the list of Jenkins Interview Questions and Answers, Jenkins Interview Questions and Answers Freshers, Jenkins Interview Questions and Answers, Jenkins Interview Questions is overwhelming but the advantages of reading all the questions will maximize your potential and help you crack the interview. The surprising fact is that this Jenkins interview questions and answers post covers all the basic of the Jenkins technology and you have to check out the FAQs of different components of Jenkins too.

However, you will be asked with the questions in the interview related to the above mentioned questions. Preparing and understanding all the concept of Jenkins technology will help you strengthen the other little information around the topic.

After preparing these interview questions, we recommend you to go for a mock interview before facing the real one. You can take the help of your friend or a Jenkins expert to find the loop holes in your skills and knowledge. Moreover, this will also allow you in practicing and improving the communication skill which plays a vital role in getting placed and grabbing high salaries.

Remember, in the interview, the company or the business or you can say the examiner often checks your basic knowledge of the subject. If your basics is covered and strengthened, you can have the job of your dream. The industry experts understand that if the foundation of the student is already made up, it is easy for the company to educate the employ towards advance skills. If there are no basics, there is no meaning of having learnt the subject.

Therefore, it’s never too late to edge all the basics of any technology. If you think that you’ve not acquired the enough skills, you can join our upcoming batch of Jenkins Training in Noida. We are one of the best institute for Jenkins in noida which provide advance learning in the field of Jenkins Course. We’ve highly qualified professionals working with us and promise top quality education to the students.

We hope that you enjoyed reading Jenkins Interview Questions and Answers, Jenkins Interview Questions and Answers Freshers, Jenkins Interview Questions and Answers, Jenkins Interview Questions and all the FAQs associated with the interview. Do not forget to revise all the Jenkins interview questions and answers before going for the Jenkins interview. In addition to this, if you’ve any doubt or query associated with Jenkins, you can contact us anytime. We will be happy to help you out at our earliest convenience. At last, we wish you all the best for your upcoming interview on Jenkins Technology.