Jenkins Interview Questions

Table of Contents

Jenkins is an open source continuous integration server, and the leading project in this category. It’s used by a large number of organizations including Facebook, Google, Etsy, Sony Mobile and more. Jenkins provides automated builds as well as test execution so there are no manual steps involved. The best thing about Jenkins is that it can be installed on premise or hosted externally to your organization.

It is a continuous integration server written in Java that monitors executions of repeated jobs, such as the compilation of source code or the generation of documentation. It can monitor executions automatically, based on a user-defined schedule, or it can be set up to trigger builds on certain changes made to the code repository (such as subversion commits) or to certain changes detected in the files (such as those generated by javac).Jenkins runs on most platforms and can be extended with both third-party plug-ins and with custom-built Java code.

In this blog post we’ll explore some interview questions related to jenkins for experienced candidates as well as freshers.

Jenkins Interview Questions for Freshers

What is Jenkins?

Jenkins is an open source continuous integration server project. It’s used by a large number of organizations to build and test software continuously.

The jenkins API could be invoked to run the following cron-like commands:

curl -fks http://localhost:8080/rest/event/phantomjs_script-cronjob-testAllJobs?parameters=1,2,3&apiSecretKey=…

where API secret key is obtained in Jenkins API Headers page (WORKSPACE > API SETTINGS > API KEYS) or via “installation wizard” steps. The Command runs 1 job for parameters 1, 2 and 3 all using PhantomJS.

What are some main Featurs of Jenkins?

It supports web service API allowing users to check the build status remotely. It has integration abilities for Apache Ant, Apache Maven and many more.

What are the Jenkins plugins that Facebook uses?

External plugins are being used by Facebook. They are able to do this because they have the privileges to install, delete and update. These plugins are used for many purposes including to optimize Jenkins, grab data from other tools, create jobs and so much more.

How would you set up a continuous integration pipeline with jenkins?
Continuous Integration with Jenkins is an important part of any development team. A continuous integration pipeline ensures that every component is tested by running a suite of tests before any code is merged into the mainline. There are many different tools that come bundled with Jenkins, which makes it easy to create whichever type of pipeline you need.

-Install Jenkins on-premises (if needed)

-Select your language

-Setup build environment for your chosen language

-Add plugins to the pipeline you need to use for your chosen language

-Add tasks in order of execution in the pipeline

Have you ever seen or had any experience with Jenkins on Google Cloud?
Yes, I have seen and had experience with Jenkins on Google Cloud. To me, it’s the most cost effective plan that they offer for continuous integration. It also offers a lot of benefits and has a lot of features. One of the best things about Google Cloud is their customer service and they’re always there to help you out with anything.

Jenkins Interview Questions for Experienced Candidates

Why use CI/CD tools like Jenkins Pipeline over Docker containers for deployment pipelines?
It is no secret that Continuous Integration and Deployment (CI/CD) has become a critical requirement in the software industry. As we look back to how we got to this point, we realize the increased need for automation and abstraction. CI/CD tool like Jenkins Pipeline provide us with a robust platform that can be used to implement an automated pipeline for deployment pipelines. Automated pipelines reduce time-to-market and eliminate any manual steps; this is important when delivering faster-moving projects such as mobile apps, where release cycles might span weeks or even months.

Describe some of your experiences collaborating remotely using Gerrit.
I found collaborating with others remotely using Gerrit to be very helpful. I was able to make changes without any need to log into the server which made my job easier. Communicating through Gerrit seemed like it took less time than other collaboration tools which made me more efficient too.

How to get the API secret key in Jenkins API Headers page (WORKSPACE > API SETTINGS > API KEYS) and via installation wizard steps?
To find your API secret key, go to the “API Headers” page under “API Settings” in Jenkins. The API secret key can also be obtained during installation using installation wizard steps.

When does a job finished running on Jenkins for Eclipse builders?
A job is considered to have completed when all of its executed tasks are finished.

How many jobs may be running in Jenkins at the same time?
There is no limit to the number of jobs that can run in Jenkins at any one time.

What are the features of Gerrit?
Gerrit provides a web based interface for reviewing patches through multiple stages, functional testing, annotation support, and code review.

How do I prepare for Jenkins interview?
The first step is to be sure that Jenkins and Maven are installed and running on your computer. This can be done by the following command:

./mvnw clean

Now, we can go ahead and create a new job on Jenkins by following these steps:

  • Click on “New Item” from the Jenkins home page.
  • Fill in the name of your job (mine is called “hello”). – Select “Freestyle Project” as the type.
  • Add a “Build Now” button under “Post-build Actions”. This will execute after we finish building our project and start browsing for this file on our hard drive.

What is the best Jenkins CI for a beginner?
Jenkins is best for a beginner because it is an all-in-one solution. It can be used to create code, to automate steps in the build pipeline, and to monitor the state of builds.

Which programming language should I learn to become a better programmer?
Jenkins is best for a beginner because it is an all-in-one solution. It can be used to create code, to automate steps in the build pipeline, and to monitor the state of builds.

Is it safe to use Jenkins without antivirus protection?

  • There is an antivirus plugin for Jenkins, but the basic Jenkins installation doesn’t include antivirus protection.
  • The antivirus plugin for Jenkins should be configured to scan the contents of the container that was used to launch the job. This will ensure that all files get scanned and not just those in the workspace root folder.

How many types of job in jenkins are there?
There are three types of jobs in Jenkins. There is a build job, a pull-request job, and a system job.

In what order can jobs be run in Jenkins pipeline?
Job ordering is completely up to the person setting up the Jenkins pipeline. They can order jobs by name or some other attribute. This is done in the Configuration section of Jenkins.

What is pipline?
Pipeline refers to a series of processes or events that are linked together. The parts of the pipeline are executed consecutively, with data passing from one stage to the next.

How to find a stage in pipeline?
Job ordering is completely up to the person setting up the Jenkins pipeline. They can order jobs by name or some other attribute. This is done in the Configuration section of Jenkins.

Which plugin is required for Jenkins and why you need it?
The plugin that’s required for Jenkins is the antivirus plugin. The reason why it is needed is because the default installation lacks antivirus protection. In order to be protected from viruses, it needs to have an antivirus enabled.

Why can you order jobs by name or some other attribute?

You can order jobs by name or some other attribute because they’re ordered between stages in a pipeline. These stages are executed consecutively with data passing from one stage to another.

What are the file types compatible with Jenkins ?
Input Files: File Types Compatible with Jenkins

  • JSON
  • XML

What are the common use cases Jenkins is used for?
The most common use cases for Jenkins are continuous integration, code coverage analysis, thumbnail generation.

How do you store credentials in Jenkins securely?
Jenkins 2.0.3 includes a new security module that allows credentials to be stored securely in Jenkins without being visible from the outside or tradable. It only provides the information required for authentication and nothing more.

How to prepare for a jenkins job interview:

Prepare Your Resume in Advance

Preparations for an interview should start prior to the interview. The most important preparation is to make sure your resume highlights the skills that the interviewer would like to see. If you are asked about certain skills, make sure you have answers prepared.

Things to Practice

Take some time in preparing responses to difficult questions in advance, think about what you would say, and practice saying them until you feel confident and relaxed when asked. Be honest; it is usually easy for us (interviewers) to tell when candidates are lying, so don’t lie.

Have Some Questions? Share with us

Leave a Comment

Your email address will not be published.

Scroll to Top