Idempotent pipeline steps in Jenkins - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a Jenkins pipeline step that runs a shell command idempotently.

Jenkins

stage('Build') {
  steps {
    sh '[1]'
  }
}

Drag options to blanks, or click blank then click option'

Aecho 'Building...'

Brm -rf *

Cexit 1

Dmkdir /tmp

Attempts:

3 left

💡 Hint

Common Mistakes

Using commands that delete or modify files like 'rm -rf *' which are not idempotent.

Using commands that exit with error causing pipeline failure.

The echo 'Building...' command is safe and idempotent because it only prints text without changing the system state.

2fill in blank

medium

Complete the code to check if a directory exists before creating it, ensuring idempotency.

Jenkins

stage('Prepare') {
  steps {
    sh 'if [ ! -d /app ]; then [1] /app; fi'
  }
}

Drag options to blanks, or click blank then click option'

Amkdir

Brm -rf

Ctouch

Dcd

Attempts:

3 left

💡 Hint

Common Mistakes

Using rm -rf which deletes files and is not idempotent.

Using touch which creates files, not directories.

The mkdir command creates the directory only if it does not exist, making the step idempotent.

3fill in blank

hard

Fix the error in the Jenkins pipeline step to make the shell command idempotent.

Jenkins

stage('Deploy') {
  steps {
    sh '[1]'
  }
}

Drag options to blanks, or click blank then click option'

Arm -rf /var/www/html/*

Brsync -a /src/ /var/www/html/

Ccp -r /src/* /var/www/html/

Dexit 1

Attempts:

3 left

💡 Hint

Common Mistakes

Using rm -rf which deletes all files and is not idempotent.

Using cp -r which copies files but may overwrite unnecessarily.

The rsync -a command copies files efficiently and only updates changed files, making it idempotent.

4fill in blank

hard

Fill both blanks to create an idempotent Jenkins pipeline step that installs a package only if missing.

Jenkins

stage('Install') {
  steps {
    sh 'if ! dpkg -l | grep -q [1]; then sudo [2] [1]; fi'
  }
}

Drag options to blanks, or click blank then click option'

Acurl

Bapt-get install

Cgit

Dvim

Attempts:

3 left

💡 Hint

Common Mistakes

Using commands that do not check package presence before installing.

Using package names that are not installed by apt-get.

The command checks if git is installed, and if not, installs it using apt-get install. This makes the step idempotent.

5fill in blank

hard

Fill all three blanks to create an idempotent Jenkins pipeline step that updates a config file only if a setting is missing.

Jenkins

stage('Configure') {
  steps {
    sh '''
      if ! grep -q '[1]' /etc/app/config.conf; then
        echo '[1]=[2]' >> [3]
      fi
    '''
  }
}

Drag options to blanks, or click blank then click option'

Amax_connections

B100

C/etc/app/config.conf

Dtimeout

Attempts:

3 left

💡 Hint

Common Mistakes

Appending the setting without checking if it exists, causing duplicates.

Using wrong file path or key names.

This step checks if the setting max_connections is in the config file. If missing, it appends max_connections=100 to /etc/app/config.conf. This ensures idempotency by not duplicating the setting.