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Jenkins Interview Questions

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Jenkins Interview Questions

Last Updated: 04/25/2018

If you're looking for Jenkins Interview Questions for Experienced or Freshers, you are at right place. There are lot of opportunities from many reputed companies in the world. According to research Jenkins has a market share of about 10.8%. So, You still have opportunity to move ahead in your career in Jenkins Engineering. Mindmajix offers Advanced Jenkins Interview Questions 2018 that helps you in cracking your interview & acquire dream career as Jenkins Engineer.

Q. How the Automation have transformed software development according to you?
Software Development is a basically a complex procedure and its known to be a task that needs a lot of attention. There are certain critical things about the development and even a minor bug can create a lot of issues. Automation has cut down the human interference from the development and has enabled them to assure minimum errors in the codes. Also, the reliability, as well as the efficiency has also been offered by the automation up to a great extent. Also, the tasks can be performed quickly and the robotic workforce has fewer conflicts among them unlike humans which always make sure of quality outcomes.

Q. Name a few important features which you can have in the Pipeline?
There are many features which are present in the Pipeline and they are:

1. Extensibility
2. Pausability
3. Adaptability
4. Proportionality
5. Durability
6. Versatility 
7. Long Code Approach

Q. As a user, what are the requirements you need to fulfill for using the Jenkins Technology?
All the users must have a working build script that should be present in the repository and in addition to this, a source code repository accessible to the user should also be there. There are no other requirements. 

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Q. Is it possible for the users to move the Jenkins from one server to another without changing its content?
Yes, it is possible provided the servers run on the same OS. In case they are different, this task can still be performed but it needs more care in terms of data handling. 

Q. In the Software development approach, is it necessary that all the modules to be automated? Why or why not?
It is not necessary that all the modules are to be automated to get the most desired results and this is because of the fact that some tasks can only be performed accurately if humans have interference in them. In Automation, tasks are accomplished by robots but what they have to do is controlled by the humans. 

Q. How well do you know about Jenkins and how do you think it is different from the other tools in its class?
It is basically one of the popular tools for Software development automation. One of the best things about this tool is it has inbuilt plug-in for continuous integration. It is known to keep a close eye on the version control system, to simply let the users make sure of monitoring the build systems. Generally, a lot of changes are there which it notes down for the future references. The entire process is noted and the users are free to check whether the changes made are appropriate or not. 

Q. By using Jenkins, what are the benefits that one can have according to you?
The answer provided by you here depends largely upon the experience. If you don’t have much information regarding the Jenkins, you can reply the following.

It is possible for the users to catch the build failure through Jenkins. Also, with this technology, it is possible to get notifications upon any single change made in the repository. Developers can simply get idea regarding the build report success or the failure and this can be done by the Jenkins integration with LDAP. In addition to this, the continuous integration agile development can also be assured simply. The best thing is Jenkins can simply let the users to look for the errors and major bugs in the early phase of development which later create a lot of issues.

Q. Name any two important Plugging that you can deploy in Jenkins while handling software development automation?
These are Amazon EC2, Copy Artifact and HTML Publisher

Q. Tell what should you do for moving the Jenkins between different servers?
First of all copy the related job directory from the original set of installation to another. Then, users need to make a copy of a job present already simply by making use of the cloning option but with a different name. The job remaining can now be copied directly to another server.

Related Article: Jenkins Installation On Windows

Q. Can you start Jenkins manually? Tell the commands you use for this if so?
Yes, it is possible and for this there are two commands present and they are Jenkin_url/restart and Jenkin _url/safe restart

Q. What are the conditions to deploy a custom build for a core plug-in?
First of all, Jenkins are to be stopped, next condition is to delete the history of plug-in expanded recently.  An empty file with a default name is to be created post which the users have to start Jenkins.

Q. How one can create a backup in the Jenkins?
One of the best things about Jenkins is it simply store all the data including the Build artifacts, as well as logs in it. In case a back of the setup and all other information is required, the users have to make sure that they have enabled the cloning of job directory or replicate the same post which backup can be created with default options. 

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Q. What exactly do you know about Continuous Integration and what role it has played in making automation technology more superior?
Generally, software development is a task that is accomplished in different sections and it is not always necessary that same teams and groups work on them all. There are things which are accomplished by different professionals. In continuous integration, all the modules or the segments are combined together and this is to perform the integration test reliably. Generally, the segments are considered and tested regularly so that any sort of new changes can be adopted and combined. This simply makes sure that when it comes to automation of all the development software, each module can adopt the same reliably. 

Q. What exactly do you know about the cloning the Git Repository through Jenkins?
A Git repository can easily be cloned with the help of Jenkins. For this, you need to first provide the e-mail address that is related to the Jenkins System. For this, the directory is to be executed through the concerned command. 

Q. Tell us a bit about what your service and plugin do. Who is it for? What are the highlights of your plugin?
LOADER.IO
is a simple-to-use cloud-based load testing service. The service is designed for developers and people who need to ensure applications are performing as they should. It allows developers to perform large-scale load tests on demand, which lets them understand the scalability and performance of their applications. We realize Jenkins is the preferred build service for a lot of our users, and we know providing a way for them to implement, measure and improve application performance during the continuous build cycle is important. So we wrote a Jenkins plugin that allows load testing to be brought into the continuous build and deployment process with ease.

Q. Which SCM tools does Jenkins support?
Jenkins supports the following SCM tools:

1. AccuRev
2. CVS
3. Subversion
4. Git
5. Mercurial
6. Perforce
7. Clearcase
8. RTC

Q. Name some Jenkins plugins ?

  • Copy Artifact
  • Amazon EC2
  • ThinBackup
  • HTML publisher
  • Copy artifact
  • Throttle Builds
  • Green Balls
  • Build Pipeline
  • JaCoCo
  • xUnit

Q. How to setup / configure Jenkins jobs?
Steps to be followed for settingup Jenkins jobs:

  • Go --> Jenkins Dashboard --> Click on New Item
  • Select the ‘Freestyle project option’. 
  • Select OK button inorder to create a new job.
  • Next Page Displays, where you have to configure the job.

Q. What do you mean by the term DSL Jenkins?
It stands for Domain Specific Language Jenkins and is an inbuilt approach in the Jenkins environment with the help of which scripts can be maintained and made to run with the local server.

Q. Can you give some idea about the tools which are generally used for the configuration and provisioning in the Jenkins?
The tool which is generally preferred is Ansible and it has mainly features for the cloud deployment of the automated software development approach. This tool has many additional features with it and the best thing is it can easily be deployed as an orchestration tool. 

Q. Can you make sure of dependency management in the Maven and ANT?
In case of Maven, the same is possible whereas, it is not possible in case of Ant. This is also a basic difference between both of them

Q. Name a few SCM tools that are supported by the Jenkins?
There are many version control tools which it generally supports and the best thing is they include tools for CVS as well. The other tools which it supports widely are RTC, Clearcase, Perfore, Apache Ant, and more especially the arbitrary shell scripts.

Q. How can you schedule a Build in the Jenkins environment?
It is possible to do so either manually or with the Build triggers. Users simply need to look for the concerned Build Triggers and then need to make sure that task is repeated periodically. The build definition can easily be scheduled without facing any error if the time to execute the build is already defined. 

Q. Brief on Blue Ocean?
Blue Ocean reevaluates the user  experience of Jenkins. Outlined starting from the earliest stage for Jenkins Pipeline, yet at the same time perfect with freestyle jobs, Blue Ocean lessens clutter and builds clearness for each individual from the team. Blue Ocean's principle highlights include:

  • Sophisticated visualization
  • Pipeline editor
  • Personalization 
  • Pinpoint precision
  • Native integration for branch and pull requests.

Q. What are the commands to start jenkins manually?
/restart : Force restart (will not wait for ongoing build to complete)
/safeRestart : Wait for all builds to complete before restarting.

Q. Name Some Pipeline Development Tools?

  • The Blue Ocean Pipeline Editor
  • Command-line Pipeline Linter
  • Replay

Q. Define Fingerprint in Jenkins?

A hash is a unique globally, that tracks usgae of an Artifact or some other entities across the mutiple pipelines.

Q. Can you name the two important components of Jenkins?
Apache Maven and Version Control 

Q. What are the actual applications for which the Jenkins can be deployed?
It is basically an approach that is used when it comes to testing and reporting the isolated changes that generally take place in the codes which are complex and are real time. The developers can easily make sure that the defects can be avoided and the best part is the quality of the overall code can be improved rapidly and all the builds can be tested through an automated approach. 

Q. When it comes to Software development, do you think the testing can be automated or it should be performed manually?
Most of the testing procedures can simply be considered through automated technologies depending upon the scale or level upto which it is required. However, a few little procedures are still opted manually for proper bug elimination and control. 

Q. What do you mean by Jenkins Pipeline?
It is basically an approach with the help of which it is possible for the users to make the pipeline plug-in more scriptable and useful for the development of complex software

Q. As a user, when you will use the Jenkins with the Selenium and what is the scope of the same?
Well, the fact is Selenium tests are quite common in the Jenkins environment and the users are free to keep up the pace simply with them whenever there is a change taken place in the software. With Jenkins, the test can be scheduled to run in a way that is required by the user. It is possible to run any test anytime and they can even be made to run at a later date.

Q. What are the Continuous Integration tools you are familiar with?
Before you answer these questions, keep it in mind that generally the users are not familiar with all of them. In other words, even if you use Jenkins, it’s not necessary that you use all of them even when the tasks are quite complex. So you can tell the interviewer about the ones you are familiar with from the below list.

Bamboo, Go CD, TeamCity, CodeShip, GitLab CI, Travis CI, Circle CI.

Q. What does CI CD stand for and for what purpose it is generally deployed in the software development environment?
It is basically an approach that stands for Continuous Integration and Deployment Pipeline. Generally, it is one of the widely used aspects of a software development approach and is useful when it comes to saving time and development that is free from all sort of errors. Simply the quality of the outcome can be enhanced with this approach and the good thing is there is several automation tools present in it with the help of which the users can easily keep up the pace without worrying about anything. 

Related Article: Continuous Integration With Jenkins

Q. Compare Jenkins with Maven? And tell how you can put them separate from one another.
Maven is actually a build tool which is useful for build and control purposes while on the other side, the Jenkins is a powerful continuous integration approach that can automate the development processes in very reliable manner. Maven is preferred while the applications are short scale whereas when the code is large and needs a lot of attention, the Jenkins approach is adopted and preferred.

Q. How it is possible for the users to access the multiple Jenkfiles that belong to different branches and have the same project associated with them?
This is done generally with the help of Multibranch Pipeline concept where the Jenkin can automatically block for the pipelines and manage them.

Q. What does the Term Blue Ocean mean in Jenkins?
Basically, it is an approach that let the users keep up the pace with some additional features on modeling and presenting the software development process along with its automation abilities without compromising with the extensibility.

Q. Tell anyone difference between Hudson and Jenkins?
The prime difference that put them different from one another is Hudson is not supported by the Sun technologies whereas the Jenkins is.

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