Top 20 Jenkins Interview Questions and Answers Set -02?

 How to send email notification with groovy script in Jenkins pipeline?

Pipeline Script Fundamentals

Click Here:   DevOps Related Posts

Before we start with complex Jenkins interview questions for experienced people, we should know more about Jenkins. So our first question is on the simple definition of Jenkins.

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Top 20 Complex Jenkins Interview Questions

1. What is Jenkins?

As defined in Jenkins docs, "Jenkins is a self-contained, open source automation server that can be used to automate all sorts of tasks related to building, testing, and delivering or deploying software."

We use it to create jobs or tasks which will help us to achieve CI and CD in our project.

The best thing :  it is "FREE FREE FREE :)

What to Use Jenkins for and When to Use It

Use Jenkins to automate your development workflow so you can focus on the work that matters most. Jenkins is commonly used for:

• Building projects
• Run tests to detect bugs and other issues as soon as they are introduced
• Static code analysis
• Deployment

Execute repetitive tasks, save time, and optimize your development process with Jenkins.

2.  How to install Jenkins?

ANS: Click Here For Steps (with screenshots)

3. Can you write a pipeline script having steps called in stage?

    agent any

        stages {

            stage ('Build') {

                steps {

                    echo

                    'Running build phase. '

                }

            }

        }

    }

4. What is Pipeline, Node and Stage in Jenkins?

ANS: Click Here for All Pipeline Concepts and Terminology

5. Can you write a pipeline script haveing multiple stages in it?

agent any

    stages {

        stage ('Build') {

        }

        stage ('Test') {

        

        }

        stage ('Deploy') {

        

        }

     

    }   

6. How to send email notification in Jenkins using groovy script? VERY IMP

ANS: Click Here For Answer with Groovy Script Steps

7. Can you write a pipeline script where you can call your Maven with automation suite?

node {
	stage ('SCM checkout'){
	git "https://gitlab.com/mbabilo/experitest"
	}
	stage ('Build'){
	dir("comtest") {
	sh "mvn clean install"
	}
	dir("comtest/target") {
	sh "java -jar com.test-1.0-SNAPSHOT.jar"
	}
	}
	}

8. How to schedule a job in Jenkins? How to set nightly Automation Job?

ANS:  Click Here For Schedule Job

9. How to create a pipeline script in Jenkins UI?

Step 1: We create a new project for the pipeline by navigating to Jenkins and then clicking on New Item.

Step 2: Next, we select Pipeline from the given list of options.

Step 3: Then, we will scroll down to Advanced Project Options and paste the pipeline script code that we saw above into the code pane and hit the Save button.

Step 4: We need to set up a test build, which can be quickly done by the Jenkins UI by clicking Build Now.

Step 5: We can see a new build generating under the build history as we click on Build Now. The console logs output can be viewed by clicking on the Build.

10. How to create parameterized job in Jenkins? VERY IMP

ANS: Click Here For Answer with Screenshots

Limitations of Jenkins

• Old fashioned dashboards with not many options to customize it
• Containers readiness (this has improved with Jenkins X)
• By itself, it doesn't have many features. On the other hand, there many plugins created by the community to expand its abilities
• Managing Jenkins and its pipelines as a code can be one hell of a nightmare

REVISION

18. How you can Fail a build in JenkinsFile?

Ans:  By using error step from pipeline DSL we can be able to Fail a build, like : error("Build failed due to ....")

error: Error signal

Signals an error. Useful if you want to conditionally abort some part of your program. You can also just throw new Exception(), but this step will avoid printing a stack trace.

19. What is Pipeline, Node and Stage in Jenkins?

ANS: Click Here for All Pipeline Concepts and Terminology

20. How to catch error in jenkins file and set build result to failure?

Ans: By using catchError.

If the body throws an exception, mark the build as a failure, but nonetheless continue to execute the Pipeline from the statement following the catchError step. The behavior of the step when an exception is thrown can be configured to print a message, set a build result other than failure, change the stage result, or ignore certain kinds of exceptions that are used to interrupt the build.

node {
    catchError {
        sh 'might fail'
    }
    step([$class: 'Mailer', recipients: 'admin@somewhere'])
}

To explore more, please refer: catchError()

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