Artifact retention policies in Jenkins - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding artifact retention in Jenkins

What is the primary purpose of setting artifact retention policies in Jenkins?

A To automatically delete old build artifacts to save disk space

B To speed up the build process by caching artifacts

C To increase the number of builds stored indefinitely

D To prevent any build artifacts from being deleted

💡 Hint

Think about why disk space might be limited on build servers.

Artifact retention policies help manage disk space by removing old or unnecessary build files automatically.

💻 Command Output

intermediate

Effect of artifact retention configuration in Jenkinsfile

Given the following Jenkinsfile snippet, what will be the number of builds with artifacts retained after 10 builds?

Jenkins

pipeline {
  agent any
  options {
    buildDiscarder(logRotator(numToKeepStr: '5', artifactNumToKeepStr: '3'))
  }
  stages {
    stage('Build') {
      steps {
        echo 'Building...'
      }
    }
  }
}

A No builds will have artifacts retained

B 5 builds will have artifacts retained

C All 10 builds will have artifacts retained

D 3 builds will have artifacts retained

💡 Hint

Look at the artifactNumToKeepStr value.

The artifactNumToKeepStr controls how many builds keep their artifacts. Here it is set to 3, so only the latest 3 builds keep artifacts.

❓ Configuration

advanced

Configuring artifact retention via Jenkins UI

Which configuration in Jenkins UI correctly sets artifact retention to keep artifacts for the last 7 builds only?

A In the job configuration, under 'Build Environment', enable 'Discard old builds' and set 'Max # of artifacts to keep' to 7

B In the job configuration, under 'Discard old builds', set 'Max # of builds to keep' to 7 and 'Max # of artifacts to keep' to 7

C In the job configuration, under 'Discard old builds', set 'Max # of builds to keep' to 7 and leave 'Max # of artifacts to keep' empty

D In the job configuration, under 'Build Triggers', enable 'Discard old builds' and set 'Max # of builds to keep' to 7

💡 Hint

Artifact retention requires both builds and artifacts limits to be set.

To keep artifacts for the last 7 builds, both 'Max # of builds to keep' and 'Max # of artifacts to keep' must be set to 7 under 'Discard old builds'.

❓ Troubleshoot

advanced

Troubleshooting artifact retention not working

A Jenkins job is configured to discard old builds and artifacts, but artifacts are not being deleted as expected. What is the most likely cause?

A The Jenkins master has insufficient disk space

B The artifacts are stored on a network share that Jenkins cannot access

C The job is using a pipeline script without a <code>buildDiscarder</code> option configured

D The job has no post-build actions configured

💡 Hint

Retention settings in pipeline scripts require explicit configuration.

In pipeline jobs, artifact retention must be explicitly set using the buildDiscarder option; otherwise, Jenkins will not discard old artifacts automatically.

✅ Best Practice

expert

Best practice for artifact retention in large Jenkins environments

In a large Jenkins environment with many jobs producing large artifacts, what is the best practice to manage artifact retention efficiently?

A Use centralized artifact storage with lifecycle policies and configure Jenkins to discard local artifacts quickly

B Keep all artifacts indefinitely on Jenkins master to avoid losing any data

C Disable artifact retention and manually delete artifacts weekly

D Configure each job to keep artifacts for at least 100 builds to ensure availability

💡 Hint

Think about scalability and automation in managing storage.

Centralized artifact storage with lifecycle policies offloads storage from Jenkins master and automates retention, improving scalability and reliability.