Keeping pipelines fast in Jenkins - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run a stage only when changes are detected in the 'src/' directory.

Jenkins

stage('Build') {
  when {
    changeset '[1]'
  }
  steps {
    echo 'Building project...'
  }
}

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Aexpression true

Bbranch 'main'

Cenvironment 'PROD'

D'src/**'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'branch' instead of 'changeset' for file changes.

Not specifying the path pattern correctly.

The changeset 'src/**' condition runs the stage only if files under 'src/' changed, keeping the pipeline fast by skipping unnecessary builds.

2fill in blank

medium

Complete the code to cache dependencies in a Jenkins pipeline using the 'stash' step.

Jenkins

stage('Cache Dependencies') {
  steps {
    [1] name: 'deps', includes: 'node_modules/**'
  }
}

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Astash

BarchiveArtifacts

Cunstash

Dcheckout

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'unstash' instead of 'stash' to save files.

Using 'archiveArtifacts' which is for storing build outputs.

The stash step saves files temporarily to speed up later stages by reusing dependencies.

3fill in blank

hard

Fix the error in the pipeline code to parallelize tests correctly.

Jenkins

parallel {
  unit: {
    steps {
      sh 'run-unit-tests.sh'
    }
  },
  integration: {
    steps {
      [1] 'run-integration-tests.sh'
    }
  }
}

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Ascript

Bsh

Cbat

Dstage

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'bat' which is for Windows batch scripts.

Using 'stage' inside parallel incorrectly.

The sh step runs shell commands in Linux agents. Using it correctly runs the integration tests in parallel.

4fill in blank

hard

Fill both blanks to enable polling for changes and ensure the source code is checked out.

Jenkins

pipeline {
  agent any
  triggers {
    pollSCM('[1]')
  }
  options {
    skipDefaultCheckout [2]
  }
  stages {
    stage('Build') {
      steps {
        echo 'Building...'
      }
    }
  }
}

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AH/5 * * * *

Bfalse

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Disabling polling causes pipeline not to trigger on changes.

Skipping checkout causes build failures.

Setting pollSCM('H/5 * * * *') enables polling for changes, and skipDefaultCheckout false ensures the source code is checked out, which is needed for builds.

5fill in blank

hard

Fill all three blanks to define a fast pipeline that runs tests in parallel and uses caching.

Jenkins

pipeline {
  agent any
  stages {
    stage('Prepare') {
      steps {
        [1] name: 'cache', includes: 'dependencies/**'
      }
    }
    stage('Test') {
      parallel {
        unit: {
          steps {
            [2] 'run-unit-tests.sh'
          }
        },
        integration: {
          steps {
            [3] 'run-integration-tests.sh'
          }
        }
      }
    }
  }
}

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Astash

Bsh

Dcheckout

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'checkout' instead of 'stash' for caching.

Using 'bat' instead of 'sh' on Linux agents.

Use stash to cache dependencies, and sh to run shell scripts for both unit and integration tests in parallel, keeping the pipeline fast.