Certified Jenkins Engineer (CJE) — Questions and Answers

Question 1: Which command is used to restart Jenkins from the CLI without rebooting the server?

jenkins --restart
jenkins service restart
service jenkins reload
curl http://localhost:8080/restart (Correct answer)

Correct answer: curl http://localhost:8080/restart

You can restart Jenkins by sending a POST request to the /restart endpoint via curl or browser.

Question 2: What does 'Poll SCM' trigger do in Jenkins?

Checks the source repository on a defined schedule and triggers a build only if changes are detected (Correct answer)
Triggers a build every time any user polls the Jenkins API
Polls all connected agents for available capacity
Listens for webhook events from the SCM

Correct answer: Checks the source repository on a defined schedule and triggers a build only if changes are detected

Poll SCM causes Jenkins to check the configured repository on a schedule (using cron syntax) and triggers a build only when new commits are found.

Question 3: How do you prevent a Jenkins job from showing up in search results or the dashboard?

Use a View to filter jobs (Correct answer)
Delete the job
Set job visibility to private
Disable the job

Correct answer: Use a View to filter jobs

Jenkins Views can be configured to show only specific jobs, effectively hiding others from a given dashboard perspective.

Question 4: Which configuration approach allows Jenkins environment variables to be set system-wide for all jobs?

Job-level environment injection
Manage Jenkins > Configure System > Global properties (Correct answer)
Jenkinsfile env block
Pipeline script parameters

Correct answer: Manage Jenkins > Configure System > Global properties

Global environment variables for all jobs are configured under Manage Jenkins > Configure System > Global properties.

Question 5: Which Jenkins plugin provides the `withCredentials` pipeline step?

Credentials Binding Plugin (Correct answer)
Vault Plugin
Secret Manager Plugin
Keystore Plugin

Correct answer: Credentials Binding Plugin

The Credentials Binding Plugin provides the `withCredentials` pipeline step that binds stored credentials to environment variables.

Question 6: Which Jenkins feature allows you to copy an existing job's configuration as a starting point?

Job Template plugin
Copy From field when creating a new job (Correct answer)
Import Job
Clone Pipeline

Correct answer: Copy From field when creating a new job

When creating a new job, the 'Copy from' field lets you specify an existing job name to duplicate its configuration.

Question 7: What is the purpose of the Jenkins 'Manage Nodes and Clouds' section in administration?

Set resource limits per node
Configure node-level security policies
View, configure, and manage all Jenkins agents and cloud providers (Correct answer)
Monitor build queue across all nodes

Correct answer: View, configure, and manage all Jenkins agents and cloud providers

Manage Nodes and Clouds is the central UI for adding, removing, configuring, and monitoring all Jenkins agents and cloud-based dynamic agent providers.

Question 8: What is the function of the Jenkins Executor?

A container used to isolate builds
A plugin that manages build queues
The Jenkins API gateway
A thread responsible for executing build jobs on an agent or controller (Correct answer)

Correct answer: A thread responsible for executing build jobs on an agent or controller

An Executor is a thread slot on a node that physically runs a build; each node can have multiple executors.

Question 9: What is the purpose of the Jenkins initialAdminPassword file?

It contains the Jenkins API token
It provides the one-time setup password needed to unlock Jenkins for the first time (Correct answer)
It defines the default admin credentials
It stores hashed passwords for all users

Correct answer: It provides the one-time setup password needed to unlock Jenkins for the first time

The initialAdminPassword file contains a one-time password required to complete the Jenkins initial setup wizard.

Question 10: What is the `when` directive used for in a Declarative Pipeline?

Setting build timeouts
Specifying retry counts
Conditionally executing a stage based on a specified condition (Correct answer)
Scheduling pipeline runs

Correct answer: Conditionally executing a stage based on a specified condition

The `when` directive controls whether a stage executes based on conditions like branch name, environment variable, or expression.

Question 11: What does `sh` step do in a Jenkins Pipeline?

Sends a Slack notification
Shares files between stages
Starts a new agent shell
Runs a shell command on the agent (Correct answer)

Correct answer: Runs a shell command on the agent

The `sh` step executes a shell command (bash/sh) on the agent where the pipeline is running.

Question 12: What is the purpose of the Jenkins Manage Jenkins > System Information page?

To configure global build tools
To manage user accounts and roles
To display all installed plugins and their versions
To show JVM properties, environment variables, and system properties for diagnostics (Correct answer)

Correct answer: To show JVM properties, environment variables, and system properties for diagnostics

The System Information page displays JVM properties, environment variables, and memory usage useful for troubleshooting.

Question 13: What is the purpose of the Active Choices plugin in Jenkins?

To enable A/B testing of pipeline configurations
To dynamically populate build parameter options based on scripts or other parameter values (Correct answer)
To auto-approve waiting pipeline stages
To dynamically scale the number of executors

Correct answer: To dynamically populate build parameter options based on scripts or other parameter values

The Active Choices plugin renders dynamic, script-driven build parameters that can change based on other parameter selections.

Question 14: What is the purpose of Jenkins build artifacts fingerprinting?

Tracking which builds produced specific artifacts and which jobs consumed them to trace dependency chains (Correct answer)
Encrypting artifacts with a digital signature
Creating checksums for artifact integrity verification
Scanning artifacts for security vulnerabilities

Correct answer: Tracking which builds produced specific artifacts and which jobs consumed them to trace dependency chains

Jenkins fingerprinting records an MD5 of artifacts and tracks which jobs produced and consumed them, enabling dependency tracing across builds.

Question 15: What is the purpose of the `archiveArtifacts` step in a Jenkins Pipeline?

Pushes artifacts to a Maven repository
Saves specified files from the workspace to Jenkins so they can be downloaded after the build (Correct answer)
Compresses log files for storage
Backs up the Jenkins configuration

Correct answer: Saves specified files from the workspace to Jenkins so they can be downloaded after the build

The `archiveArtifacts` step saves files from the build workspace to Jenkins, making them downloadable from the build results page.

Question 16: What is a Jenkins Build Pipeline view?

A Gantt chart of all running builds
A visualization that shows a sequence of upstream/downstream jobs as connected pipeline stages (Correct answer)
The Stage View available in Pipeline jobs
The Blue Ocean visualization UI

Correct answer: A visualization that shows a sequence of upstream/downstream jobs as connected pipeline stages

The Build Pipeline plugin provides a view that visualizes a chain of upstream/downstream Freestyle jobs as connected pipeline stages with manual gating.

Question 17: What does the Maven Integration plugin provide in Jenkins?

Maven wrapper auto-installation
Native Maven build support with automatic goal binding and artifact archiving (Correct answer)
A Maven repository proxy
Docker image publishing via Maven

Correct answer: Native Maven build support with automatic goal binding and artifact archiving

The Maven Integration plugin adds a dedicated Maven project type with automatic goal binding, test result publishing, and artifact archiving.

Question 18: What are the prerequisites for getting started with Jenkins?

a viable source code repository
a viable source code repository and a build script that’s registered on that repository (Correct answer)
a build script that’s registered on that repository
None of the above

Correct answer: a viable source code repository and a build script that’s registered on that repository

To effectively use Jenkins for continuous integration, two primary prerequisites are essential: a viable source code repository (like Git or SVN) where your project's code is stored, and a build script registered within that repository. The build script defines the commands Jenkins will execute to build, test, and package your application. Jenkins then monitors the repository for changes and triggers automated builds based on this script.

Question 19: In Jenkins, what does setting a job's 'Build Periodically' trigger to 'H H(6-8) * * 1-5' mean?

Build once per day, sometime between 6 AM and 8 AM, only on weekdays (Correct answer)
Build every hour between 6 and 8 on weekdays
Build at 6:00 AM and 8:00 AM on weekdays
Build 6 to 8 times per day on weekdays

Correct answer: Build once per day, sometime between 6 AM and 8 AM, only on weekdays

H H(6-8) means once at a hashed time within the 6–8 hour range, and 1-5 restricts it to Monday through Friday.

Question 20: What is a Jenkinsfile?

A Jenkins configuration backup file
A plugin descriptor file
A text file checked into source control that defines the pipeline as code (Correct answer)
A binary file that stores compiled pipeline definitions

Correct answer: A text file checked into source control that defines the pipeline as code

A Jenkinsfile is a text file stored in source control that defines the pipeline using either Declarative or Scripted syntax.

Question 21: What is the JENKINS_HOME environment variable used for?

To set the Jenkins server URL
To specify the Java installation path
To define the root directory where Jenkins stores all its data (Correct answer)
To configure the admin user home

Correct answer: To define the root directory where Jenkins stores all its data

JENKINS_HOME specifies the root directory where Jenkins stores jobs, plugins, and configuration data.

Question 22: Which plugin is commonly used to publish JUnit test results in Jenkins?

Test Results Plugin
Surefire Plugin
Test Reporter Plugin
JUnit Plugin (Correct answer)

Correct answer: JUnit Plugin

The JUnit Plugin parses JUnit-compatible XML test result files and displays trend reports on the build page.

Question 23: Which directory structure must a Jenkins Shared Library follow?

lib/, scripts/, templates/
pipelines/, stages/, utils/
groovy/, shared/, config/
src/, vars/, resources/ (Correct answer)

Correct answer: src/, vars/, resources/

A Jenkins Shared Library must follow the structure with src/ for Groovy classes, vars/ for global variables, and resources/ for non-Groovy files.

Question 24: What format are Jenkins plugin files distributed in?

.zip
.hpi or .jpi (Correct answer)
.war
.jar

Correct answer: .hpi or .jpi

Jenkins plugins are distributed as .hpi (Hudson Plugin Interface) or .jpi (Jenkins Plugin Interface) files.

Question 25: How do you pass parameters to a Jenkins Declarative Pipeline?

Using environment {} block only
Using the parameters {} directive at the top level of the pipeline block (Correct answer)
Using the params {} directive inside stages
Passing them through the agent configuration

Correct answer: Using the parameters {} directive at the top level of the pipeline block

The `parameters {}` directive at the pipeline level defines build parameters that users can supply when triggering the pipeline.

Question 26: How does Jenkins integrate with Docker to produce a containerized application artifact?

Jenkins uses the Docker Pipeline plugin to build Docker images from a Dockerfile within the pipeline and push to a registry (Correct answer)
Jenkins SSH into Docker Hub to pull base images
Jenkins requires the Docker daemon on the controller
Jenkins auto-wraps all build outputs in Docker containers

Correct answer: Jenkins uses the Docker Pipeline plugin to build Docker images from a Dockerfile within the pipeline and push to a registry

The Docker Pipeline plugin allows pipelines to build Docker images using `docker.build()` and push them to a registry using `docker.push()` within the pipeline steps.

Question 27: Which Jenkins configuration section allows you to define global Maven or JDK installations?

Manage Jenkins > Manage Plugins
Manage Jenkins > Configure System
Manage Jenkins > Script Console
Manage Jenkins > Global Tool Configuration (Correct answer)

Correct answer: Manage Jenkins > Global Tool Configuration

Global tool installations like JDK, Maven, and Gradle are configured in Manage Jenkins > Global Tool Configuration.

Question 28: What happens when you set the number of executors on the Jenkins controller (built-in node) to 0?

No builds run on the controller, forcing all builds to agents (Correct answer)
All agent connections are disabled
Jenkins stops working
Jenkins runs one build at a time

Correct answer: No builds run on the controller, forcing all builds to agents

Setting controller executors to 0 is a best practice that prevents builds from running on the controller, reserving it for management tasks.

Question 29: What is the default port Jenkins runs on after a fresh installation?

8443
8080 (Correct answer)
3000
9090

Correct answer: 8080

Jenkins listens on port 8080 by default after installation.

Question 30: Which Jenkins plugin enables triggering builds based on file system changes rather than SCM commits?

Directory Monitor Plugin
File Watcher Plugin
LocalSCM Plugin
FSTrigger Plugin (Correct answer)

Correct answer: FSTrigger Plugin

The FSTrigger Plugin monitors the file system for changes (file creation, modification, deletion) and triggers builds accordingly without needing a version control system.

Question 31: What does the `stash` step do in a Jenkins Pipeline?

Saves files in source control
Archives artifacts for download
Compresses log files
Temporarily saves files for use in a later stage or node (Correct answer)

Correct answer: Temporarily saves files for use in a later stage or node

The `stash` step saves a set of files from the workspace for retrieval with `unstash` in another stage or node.

Question 32: Which Jenkins trigger automatically starts a build when an upstream job finishes successfully?

Remote trigger
Build after other projects are built (Correct answer)
Build periodically
Poll SCM

Correct answer: Build after other projects are built

'Build after other projects are built' trigger starts the current job when one or more specified upstream jobs complete, enabling automated job chaining.

Question 33: What are the two types of Jenkins Pipeline syntax?

Groovy and JSON
YAML and Groovy
Scripted and Structured
Declarative and Scripted (Correct answer)

Correct answer: Declarative and Scripted

Jenkins supports Declarative Pipeline (simpler, opinionated) and Scripted Pipeline (full Groovy DSL flexibility).

Question 34: What Jenkins trigger type uses a cron-like expression to schedule builds at specific times?

Timer Trigger
Poll SCM
Cron Trigger Plugin
Build periodically (Correct answer)

Correct answer: Build periodically

The 'Build periodically' trigger uses a cron syntax to schedule builds at regular intervals regardless of code changes.

Question 35: Which Declarative Pipeline section is used to define actions to run after the pipeline completes regardless of result?

after {}
cleanup {}
post {} (Correct answer)
finally {}

Correct answer: post {}

The `post {}` section in Declarative Pipeline supports conditions like always, success, failure, and cleanup.

Question 36: Which Jenkins trigger automatically starts a build when a source code change is detected in the SCM repository?

Build periodically
Poll SCM (Correct answer)
Trigger builds remotely
GitHub hook trigger for GITScm polling

Correct answer: Poll SCM

Poll SCM periodically checks the SCM repository for changes and triggers a build only when changes are detected.

Question 37: What is the Jenkins agent.jar (remoting.jar) file?

A plugin for agent management
The Jenkins war file
The Jenkins CLI client
The Java executable that runs on the agent machine and communicates with the controller (Correct answer)

Correct answer: The Java executable that runs on the agent machine and communicates with the controller

The agent.jar (remoting.jar) is the Java process launched on the agent machine that establishes and manages communication with the Jenkins controller.

Question 38: Which permission allows a user to read job configurations but not modify them in Jenkins Matrix security?

Job/Read (Correct answer)
Job/View
Job/Build
Job/Configure

Correct answer: Job/Read

The Job/Read permission allows a user to view a job's configuration and build history without being able to change anything.

Question 39: How can you run a Groovy initialization script automatically when Jenkins starts?

Configure in config.xml
Add it to the Jenkinsfile
Use the Script Console startup hook
Place a .groovy file in JENKINS_HOME/init.groovy.d/ (Correct answer)

Correct answer: Place a .groovy file in JENKINS_HOME/init.groovy.d/

Groovy scripts placed in `JENKINS_HOME/init.groovy.d/` are executed automatically in alphabetical order during Jenkins startup.

Question 40: What does the 'Quiet Period' setting in Jenkins do?

Silences build notifications
Prevents builds from running during off-hours
Sets the timeout for idle agents
Delays the next build by a set number of seconds after a trigger fires (Correct answer)

Correct answer: Delays the next build by a set number of seconds after a trigger fires

The Quiet Period delays a build by a specified number of seconds to allow multiple commits to be batched before triggering.

Question 41: How does Jenkins typically detect new code changes from a Git repository to trigger a build?

Jenkins reads the Git log every minute via SSH
Developers manually click 'Build Now' after each commit
Jenkins polls the repository on a schedule or receives a webhook push notification from the Git server (Correct answer)
Jenkins monitors the file system for changes

Correct answer: Jenkins polls the repository on a schedule or receives a webhook push notification from the Git server

Jenkins can either poll the SCM on a schedule (checking for changes) or receive a webhook push from GitHub/GitLab when new commits are pushed.

Question 42: What is the purpose of the `stages` block in a Declarative Pipeline?

To specify build triggers
To configure post-build actions
To define environment variables
To contain one or more stage blocks that represent pipeline phases (Correct answer)

Correct answer: To contain one or more stage blocks that represent pipeline phases

The `stages` block is a required container that holds all individual `stage` blocks representing phases of the pipeline.

Question 43: What is the purpose of setting a 'Remote Root Directory' when configuring a Jenkins agent?

Sets the user home directory on the agent
Defines the Jenkins controller's URL from the agent's perspective
Defines the file system path on the agent where Jenkins stores workspaces and temp files (Correct answer)
Sets the root of the agent's SCM checkout

Correct answer: Defines the file system path on the agent where Jenkins stores workspaces and temp files

The Remote Root Directory is the base path on the agent machine where Jenkins creates workspaces, archives, and temporary files during builds.

Question 44: Which file in JENKINS_HOME contains the main Jenkins system configuration?

jenkins.xml
system.xml
config.xml (Correct answer)
settings.xml

Correct answer: config.xml

The `config.xml` file at the root of `JENKINS_HOME` stores the primary Jenkins system configuration in XML format.

Question 45: What is a Jenkins Multibranch Pipeline?

A pipeline with multiple Jenkinsfiles
A pipeline that runs on multiple agents in parallel
A pipeline project that automatically discovers branches and pull requests in a repository and creates pipelines for each (Correct answer)
A pipeline that manages multiple Jenkins controllers

Correct answer: A pipeline project that automatically discovers branches and pull requests in a repository and creates pipelines for each

A Multibranch Pipeline project scans a repository for branches and pull requests, automatically creating and managing a pipeline for each one using its Jenkinsfile.

Question 46: What is the difference between a Jenkins Freestyle project and a Pipeline project?

Pipeline projects cannot be parameterized
Freestyle projects support Docker; Pipeline projects do not
Freestyle projects can use agents; Pipeline projects cannot
Freestyle projects are configured via UI; Pipeline projects define the build as code in a Jenkinsfile (Correct answer)

Correct answer: Freestyle projects are configured via UI; Pipeline projects define the build as code in a Jenkinsfile

Freestyle projects are configured through the Jenkins UI and are less flexible, while Pipeline projects define the entire build process as code in a Jenkinsfile.

Question 47: Which tool is used to install Jenkins on Linux using a package manager on RHEL/CentOS?

yum or dnf (Correct answer)
snap
brew
apt-get

Correct answer: yum or dnf

On RHEL/CentOS systems, Jenkins is installed using yum or dnf package managers after adding the Jenkins repo.

Question 48: What is the Jenkins API token used for?

Generating build artifacts
Authenticating API or CLI calls without using the user's password (Correct answer)
Encrypting pipeline secrets
Accessing the Jenkins plugin repository

Correct answer: Authenticating API or CLI calls without using the user's password

Jenkins API tokens allow users and scripts to authenticate to the Jenkins API or CLI without exposing the actual user password.

Question 49: Where does Jenkins store installed plugins by default?

/usr/share/jenkins/plugins/
$JAVA_HOME/plugins/
/etc/jenkins/plugins/
$JENKINS_HOME/plugins/ (Correct answer)

Correct answer: $JENKINS_HOME/plugins/

Jenkins installs plugins in the plugins subdirectory under JENKINS_HOME.

Question 50: What is the purpose of `input` step in a Jenkins Pipeline?

To pause the pipeline and wait for human approval before continuing (Correct answer)
To read a file from the workspace
To inject credentials into the environment
To accept parameters at build time

Correct answer: To pause the pipeline and wait for human approval before continuing

The `input` step pauses pipeline execution and displays a prompt requiring a human to approve or abort before the pipeline proceeds.

Question 51: What is a Shared Library in Jenkins?

A plugin that shares build artifacts between jobs
A reusable collection of Groovy code centrally stored and shared across multiple pipelines (Correct answer)
A library of pre-built Dockerfiles
A shared workspace mounted across agents

Correct answer: A reusable collection of Groovy code centrally stored and shared across multiple pipelines

Jenkins Shared Libraries allow teams to define common pipeline logic in a centralized Git repository and reuse it across multiple pipelines.

Question 52: Which Java version is the minimum requirement for Jenkins LTS 2.x?

Java 17
Java 21
Java 11 (Correct answer)
Java 8

Correct answer: Java 11

Jenkins LTS 2.x requires Java 11 as the minimum supported version.

Question 53: When using the Jenkins Kubernetes Plugin, what is the default container used if no container is specified in a pipeline step?

The first container in the pod template
The container named 'jnlp' (Correct answer)
The container named 'default'
The jenkins/agent base container

Correct answer: The container named 'jnlp'

The `jnlp` container in a Kubernetes pod template is the default agent container that handles controller communication; steps run in it unless another container is specified.

Question 54: How do you define a parallel execution of stages in a Declarative Pipeline?

Use parallel {} inside a stage's steps
Use concurrent: true on each stage
Use concurrent {} block
Use parallel {} inside a stage block (Correct answer)

Correct answer: Use parallel {} inside a stage block

In Declarative Pipeline, parallel stages are defined using the `parallel {}` block inside a `stage {}` block.

Question 55: Jenkins, what precisely do you mean?

None of the above
Jenkins is an open source Continuous and Integration.
Jenkins is an open source Continuous Integration and Continuous Delivery Tool. (Correct answer)
Jenkins is an open source Continuous and only Continuous Delivery Tool.

Correct answer: Jenkins is an open source Continuous Integration and Continuous Delivery Tool.

Jenkins is an open-source automation server primarily designed to facilitate both Continuous Integration (CI) and Continuous Delivery (CD). It automates the various stages of the software development lifecycle, from building and testing to packaging and deploying applications. This comprehensive capability makes it a cornerstone for modern DevOps practices, ensuring rapid and reliable software releases.

Question 56: Which Declarative Pipeline directive is used to set environment variables for use in pipeline steps?

variables {}
params {}
environment {} (Correct answer)
globals {}

Correct answer: environment {}

The `environment {}` directive in Declarative Pipeline defines key-value pairs available as environment variables throughout the pipeline.

Question 57: Which LDAP setting in Jenkins specifies the attribute used to find the user's username in the directory?

Display name attribute
User search filter
User ID attribute (Correct answer)
Group membership attribute

Correct answer: User ID attribute

The User ID attribute specifies which LDAP attribute (e.g., `uid` or `sAMAccountName`) maps to the Jenkins username.

Question 58: What is the function of the Throttle Concurrent Builds plugin?

Throttles network usage during artifact transfer
Queues builds and releases them on a schedule
Limits the number of concurrent builds per job or globally to prevent resource contention (Correct answer)
Limits builds per user account

Correct answer: Limits the number of concurrent builds per job or globally to prevent resource contention

The Throttle Concurrent Builds plugin restricts how many instances of a job (or category of jobs) can run simultaneously to prevent overload.

Question 59: What is the Jenkins Kubernetes Plugin's pod template used for?

Specifying the containers, resources, and configuration of the Kubernetes pod used as a build agent (Correct answer)
Configuring Kubernetes cluster credentials
Templating Helm chart values for deployment
Defining the Docker image used in Docker Pipeline steps

Correct answer: Specifying the containers, resources, and configuration of the Kubernetes pod used as a build agent

A pod template defines what containers, volumes, and resource requests the dynamically provisioned Kubernetes build agent pod should have.

Question 60: What does `withCredentials` block do in a Jenkins Pipeline?

Rotates Jenkins API tokens
Creates new Jenkins credentials
Validates credentials before a build starts
Binds stored credentials to environment variables for use within its block (Correct answer)

Correct answer: Binds stored credentials to environment variables for use within its block

The `withCredentials` block retrieves credentials from Jenkins' credential store and exposes them as environment variables within the block scope.

Certified Jenkins Engineer (CJE)

The CloudBees Certified Jenkins Engineer (CJE) exam validates expertise in Jenkins administration, pipeline configuration, and continuous delivery practices. It covers CI/CD concepts, Jenkins features, pipeline development, and CD-as-Code best practices.

Questions

35 min

Time Limit

66%

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