Top 12 JENKIN Interview Questions

1) Mention what is Jenkins?

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.

2) Explain what is continuous integration?

In software development, when multiple developers or teams are working on different segments

of same web application, we need to perform integration test by integrating all modules. In

order to do that an automated process for each piece of code is performed on daily bases so

that all your code get tested.

3) What is the requirement for using Jenkins?

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

4) Mention what are the advantages of Jenkins?

Advantage of Jenkins include

At integration stage, build failures are cached

For each code commit changes an automatic build report notification generates

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

5) Explain how you can move or copy Jenkins from one server to another?

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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.

6) Mention what are the commands you can use to start Jenkins manually?

To start Jenkins manually, you can use either of the following

(Jenkins_url)/restart: Forces a restart without waiting for builds to complete

(Jenkin_url)/safeRestart: Allows all running builds to complete

7) Mention some of the useful plugins in Jenkin?

Some of the important plugins in Jenkin includes

Maven 2 project

Amazon EC2

HTML publisher

Copy artifact

Join

Green Balls

8) Explain how you can deploy a custom build of a core plugin?

To deploy a custom field of a core plugin, you have to do following things

Stop Jenkins

Copy the custom HPI to $Jenkins_Home/plugins

Delete the previously expanded plugin directory

Make an empty file called .hpi.pinned

Start Jenkins

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9) Explain how can create a backup and copy files in Jenkins?

Jenkins saves all the setting, build artifacts and logs in its home directory, 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.

10) Explain how you can clone a Git repository via Jenkins?

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.

11) Explain how you can set up Jenkins job?

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.

12) Mention what are the two components Jenkins is mainly integrated with?

Jenkin is mainly integrated with two components

Version Control system like GIT, SVN

And build tools like Apache Maven.