These are the most commonly asked Jenkins Interview Questions, which are collected after doing lots of research and after discussing with some top Jenkins experts. We are sure this will be helpful for both freshers and experienced to land in their dream job as Jenkins Professional.
Here, we have covered everything right from basic to advanced concepts for your reference. So utilize our Jenkins Interview Questions for having a quick revision of some important concepts before appearing for an interview.
For your better understanding to Learn Jenkins Interview Questions, we have divided these questions into two types.
Let’s get started.
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Ans: Jenkins is one of the leading open-source continuous integration tools. The main functionality of this tool is to keep track of the version control system and monitor the build system and provide notifications and reports to alert. It enables you to deliver software by integrating with a large number of testing and deployment technologies.
The following are the reasons to use Jenkins:
It possesses an installer package for major operating systems.
Integrates individual projects for a larger purpose
To keep your team in sync
Troubleshoot and audit past jobs effortlessly
Provides accurate data support for project management
[Related Article: Install Jenkins on Windows]
Ans: Continuous integration is a process of continuously checking the developer’s code into a version control system several times a day and automating the build to check and detect bugs in the written code. Continuous Integration includes the following:
Development and Compilation
Generating and Analyzing Reports
Ans: Jenkins comes with the following features:
Free open source.
Easy installation on various operating systems.
Build Pipeline Support.
Test harness built around JUnit.
Rapid release cycle.
Easy configuration setup.
Excellent community and documentation
Extensible with the use of third-party plugins.
Ans: The advantages of using Jenkins are the following:
Open-source tool and user-friendly
Easy to install
Provides great collaboration between development and operations teams.
Code deployment is easy and happens in minutes, along with the generation of reports.
Free of cost
Rich plugin ecosystem
Code errors can be detected as early as possible.
Automation of integration work, thereby reducing the number of integration issues.
[Related Article: Jenkins Tutorial for Beginners]
Ans: We require the following to use Jenkins:
A source code repository that is accessible, for instance, and a Git repository
A working build script. e.g., a Maven Script checked into the repository
Ans: Some of the important plugins in Jenkin includes:
Ans: To restart Jenkins manually, you can use any one of the following commands:
(jenkins_url)/safe restart - Allows all running jobs to complete. New jobs will remain in the queue to run after the restart is complete.
(jenkins_url)/restart - Forces a restart without waiting for builds to complete.
Ans: Jenkins is mainly integrated with the following:
Ans: Jenkins was a renamed version of Hudson.
Install Java Version 8
Install Apache Tomcat Version 9
Download Jenkins war File
Deploy Jenkins war File
Install Suggested Plugins
Ans: Jenkins can be manually started by opening the Console/Command line and using the below commands:
Start Jenkins: jenkins.exe start
Stop Jenkins: jenkins.exe stop
Restart Jenkins: jenkins.exe restart
Continuous Integration Tool
Build automation tool
Command Line/Java Library Tool.
Automates software development process through continuous integration and facilitates continuous delivery.
Describes software dependencies and explains how the software is built
Drives build process
Supports version control tools like Git, AccuRev.
Supports projects written in C#, Ruby.
Supports projects written in C and C++.
Ans: By default, there are numerous variables available in Jenkins. Some of them are:
Ans: To deploy a custom build of a core plugin, you have to do the following:
Ans: Parameters are supported by the Agent section. They are used to support several use-cases pipelines and are defined at the top-level of the pipeline or inside an individual stage directive.
Ans: The agent directive specifies Jenkins how and where to execute the entire pipeline. The directive is specified at the top-level inside the pipeline block and stage-level usage is optional.
Ans: Flow control supports the pipeline structure (scripted pipeline) for executing the top to bottom of the Jenkins file.
Ans: Below mentioned ways help you to start the node agent –
Ans: Jenkins Pipeline is a set of features of Jenkins, which are installed as plugins to enable continuous delivery pipeline implementation. These are the automated processes to get the software from source control through deployment to end-users.
Ans: JENKINS_HOME directory is used to store all the settings, configurations, and logs.
Ans: There are multiple ways to do that as mentioned below:
Move a job from one installation of Jenkins to another by simply copying the corresponding job directory.
Make a copy of an existing job by making a clone of a job directory by a different name.
Rename an existing job by renaming a directory.
Ans: The following steps will help you to build jobs in Jenkins:
Step 1: First, go to the Jenkins dashboard and click on the New Item.
Step 2: Enter the Item name and choose the ‘Freestyle project option’.
Step 3: Specify the details of the job.
Step 4: Next, specify the location of files that need to be built.
Step 5: If your repository is hosted on Github, you can also enter the URL of that repository here.
Step 6: Build section and click on the Add build step.
Step 7: In the command window, enter the following commands and then click on the Save button.
( Javac HelloWorld.java
Step 8: You can click on the Build Now option to see if you have successfully defined the job.
Step 9: Once the build is scheduled, it will run.
Step 10: Click on the Console Output link to see the details of the build
Structure of the declarative pipeline: