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Maven / Jenkins Interview questions

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What is Jenkins tool?

Jenkins is an open-source free automation tool used to build and test software projects. The tool makes it painless for developers to integrate changes to the project. Jenkins' primary focus is to keep track of the version control system and initiate and monitor a build system if there are any changes. It keeps an eye on the entire process and provides reports and notifications to alert.

  • Use Jenkins to detect defects in the software development lifecycle and automate the testing of builds.
  • To continuously monitor the code in real-time and integrate changes into the build.
  • Jenkins is a great fit for building a CI/CD pipeline because of its plugin-capabilities, and simple-to-use nature.
Features of Jenkins.
  • free and open-source automation tool,
  • Jenkins provides a vast number of plugins,
  • Easier to set up on various operating systems,
  • Provides pipeline support,
  • Fast release cycles ,
  • Easier upgrades.
How to install Jenkins?

The Jenkins Web application ARchive (WAR) file can be started from the command line like this:

  • Download the latest stable Jenkins WAR file to an appropriate directory on your machine.
  • Open up a terminal/command prompt window to the download directory.
  • Run the command java -jar jenkins.war.
  • Browse to http://localhost:8080 and wait until the Unlock Jenkins page appears.
  • Continue on with the Post-installation setup wizard below.
Mention the two components Jenkins is mainly integrated with?
  • Version Control systems like GIT, SVN.
  • And build tools like Apache Maven, and Gradle.
Mention some of the useful plugins in Jenkin?
  • Maven plugin
  • Amazon EC2
  • HTML publisher
  • JUnit Plugin
  • JIRA plugin
  • Green Balls
  • Mailer Plugin
  • Slack Notification plugin
  • Docker plugin
  • Pipeline plugin
Does Jenkins support continuous integration?

Yes.

Explain "Continuous Integration" (CI) with reference to Jenkins?

Continuous Integration is a software development process where the code is continuously tested after a commit, to ensure there are no defects/bugs.

In large teams, many developers work on the same code base. Thus, any multiple commits can cause a bug. With continuous integration, bugs can be identified early and fixed before pushing changes to production. Any new code is integrated into one executable form, termed a build. If the build is green (i.e. all ok, no bugs), then the executable artifact can be deployed. If not, the bug needs to be fixed, and the new build is tested again.

What is Continuous Delivery and Continuous Deployment in Jenkins.

Continuous Delivery (CD) is the process of building, testing, and delivering improvements to the software code. This is still a manual process and deployment happens by clicking a button.

Continuous deployment goes one step further than continuous delivery. With this practice, every change that passes all stages of your production pipeline is released to your customers. There's no human intervention, and only a failed test will prevent a new change to be deployed to production.

What is meant by CI/CD pipeline?

A continuous integration and continuous deployment (CI/CD) pipeline is a series of steps that must be performed in order to deliver a new version of software. CI/CD pipeline is a process that drives software development through a path of building, testing, and deploying code.

By automating the process, minimizes human error and maintains a consistent process for how software is released. CI/CD is the backbone of a DevOps methodology, bringing developers and IT operations teams together to deploy software.

Explain Jenkins Pipeline.

Jenkins Pipeline (or simply "Pipeline") is a suite of plugins that supports implementing and integrating continuous delivery pipelines into Jenkins. A continuous delivery pipeline is an automated expression of your process for getting software from version control right through to your users and customers.

a Jenkins Pipeline is a collection of jobs or events that brings the software from version control into the hands of the end-users by using automation tools. It is used to incorporate continuous delivery in our software development workflow.

What is JenkinsFile?

A Jenkinsfile is a text file that contains the definition of a Jenkins Pipeline and is checked into source control. Consider the following Pipeline which implements a basic three-stage continuous delivery pipeline.

pipeline {
    agent any

    stages {
        stage('Build') {
            steps {
                echo 'Building..'
            }
        }
        stage('Test') {
            steps {
                echo 'Testing..'
            }
        }
        stage('Deploy') {
            steps {
                echo 'Deploying....'
            }
        }
    }
}

Types of Syntax used in creating Jenkinfile.

There are two types of syntax using which we can define a Jenkinsfile:

  • Declarative Pipeline syntax, is a new feature that used code for the pipeline. It provides a limited pre-defined structure. Thereby, it offers an easy & simple continuous delivery pipeline. Moreover, it uses a pipeline block.
  • Scripted Pipeline syntax, is the old traditional way to write the Jenkinsfile on Jenkins web UI. Moreover, it strictly follows the groovy syntax and helps to develop a complex pipeline as code.
What is a Jenkins project?

A Jenkins project involves steps and post-build actions and is a repeatable build job.

Mention different CI/CD tools.
  • TeamCity,
  • Bamboo,
  • Perforce,
  • Circle CI,
  • Go,
  • ThoughtWorks,
  • Integrity,
  • and Travis CI.
Difference between Hudson and Jenkins.

Hudson was the earlier name and version of the current Jenkins. The project got renamed from Hudson to Jenkins.

What is Blue Ocean plugin in Jenkins?

Blue Ocean is a new user experience for Jenkins based on a personalizable, modern design that allows users to graphically create, visualize and diagnose Continuous Delivery (CD) Pipelines.

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