Jenkins Advanced Quiz

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Challenge yourself with advanced Jenkins scenarios, security, and scaling.

Instructions:

• Select the best answer for each question.
• Your score will be shown at the end.

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what is the Groovy script approved to run in Jenkins sandbox by default?

Script Security Plugin

Admin Script

Root script

Unsafe script

The Script Security plugin integrates with the Groovy Sandbox to restrict what scripts can do unless approved by an administrator.

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How do you set up a high-availability (HA) Jenkins environment?

Jenkins does not support active-active HA natively; usually requires active-passive setup or CloudBees CI

Simply run two Jenkins instances on the same port

Use the "HA Plugin"

Run Jenkins config in read-only mode

Open-source Jenkins is generally Active-Passive. Enterprise versions (CloudBees) offer Active-Active HA.

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What is the purpose of the stash and unstash steps in Pipeline?

To move files between different agents in the same build

To save files to Git

To hide files from logs

To zip files for download

stash saves files for use later in the same build, often on a different agent/node. archiveArtifacts is for long-term storage after the build.

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What happens if the Jenkins Controller goes down during a build?

Running builds usually fail or hang unless durable task plugin is used effectively

Builds continue and report back later

A backup controller takes over instantly

The build is paused and auto-resumed

Generally, connection loss to the controller causes pipelines to fail unless using durable tasks that survive restart (which is standard now, but restarting the controller usually interrupts the flow).

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Which allows using Docker containers as dynamic build agents?

Docker plugin / Kubernetes plugin

Container plugin

Virtual Machine plugin

Dynamic Node plugin

Plugins like docker-plugin or kubernetes-plugin allow spinning up ephemeral agents for each build.

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What is the "Replay" feature in Jenkins Pipelines?

Rerunning a build with modified Pipeline script without committing to SCM

Replaying the console log

Undoing a deployment

Rolling back plugins

Replay allows you to quick-fix and re-run a pipeline build for debugging purposes.

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How can you prevent a Job from running concurrently?

options { disableConcurrentBuilds() }

triggers { once() }

stages { single() }

agent { lock() }

disableConcurrentBuilds() ensures only one instance of the pipeline runs at a time.

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What is the difference between node and agent in scripted vs declarative pipelines?

node is for Scripted, agent is for Declarative

They are exactly the same

node is deprecated

agent is for verified users

node allocates an executor in Scripted Pipeline. agent is the declarative directive that manages node allocation.

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How can you parse JSON in a Jenkins Pipeline?

readJSON (Pipeline Utility Steps plugin) or JsonSlurper

parseJson command

json_decode

You cannot parse JSON

readJSON is a common step provided by the Pipeline Utility Steps plugin. JsonSlurper is a standard Groovy class.

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What is "Matrix Authorization Strategy"?

A fine-grained security model to assign permissions to users/groups

A way to build matrix projects

A plugin for visual effects

A database authorization tool

It allows you to configure exactly which users or groups can do what (Read, Build, Configure, Delete, etc.).

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What is the lock step used for?

To restrict concurrent access to a shared resource

To lock the user out

To encrypt the pipeline

To pause the build forever

The Lockable Resources plugin allows you to define a lock step to ensure exclusive access to a resource (like a database or environment) during a stage.

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What is a "Seed Job" in the context of Job DSL?

A job that runs a DSL script to generate other jobs

The first job ever run

A randomized job

A training job

The Seed Job processes the Job DSL script and creates/updates the full hierarchy of managed jobs.

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How do you deal with "PermGen" or "Metaspace" errors in Jenkins?

Increase the Metaspace size in JVM arguments (-XX:MaxMetaspaceSize)

Delete plugins

Restart Jenkins

Add more disk space

Jenkins creates many classes dynamically. Increasing Metaspace allows more classes to be loaded without crashing the JVM.

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What is the main advantage of using the Kubernetes Plugin?

Elastic scalability and isolated build environments

Better UI

Faster core performance

Automatic upgrades

It creates a fresh Pod for every build and destroys it afterwards, providing clean, isolated environments and cost-effective scaling.

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What is the "Durable Task" plugin?

Makes shell scripts survive Jenkins restarts

Makes tasks run faster

Saves logs permanently

Retries tasks

It allows a step (like sh) to survive a controller restart by running the process asynchronously and persisting its PID/state.

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How do you enforce code style/linting on Jenkinsfiles?

Using the "Jenkinsfile Linter" (CLI or Editor extension)

You cannot lint Jenkinsfiles

Running compiled java

Using Checkstyle

The Jenkins CLI/API provides a linter endpoint to validate Declarative Pipeline syntax.

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What is cps in "Non-CPS"?

Continuation Passing Style

Continuous Pipeline Service

Code Processing System

Core Process Step

CPS is how Jenkins pauses/resumes pipelines. @NonCPS marks methods to run as native compiled Groovy (faster, but cannot pause/wait).

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Why would you use @Library('my-lib@master') _?

To load the 'master' branch of the shared library

To load as admin

To load from master node

To lock the library

The @version syntax specifies which branch or tag of the shared library to use for that build.

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What is the purpose of the validateDeclarativePipeline step?

Validates the syntax of a declarative pipeline file

Runs the pipeline

Checks permissions

Deletes the pipeline

It takes a path to a file and returns errors if the syntax is invalid.

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How can you trigger a pipeline from a remote script?

By making an HTTP POST request to the job URL with an authentication token

By emailing Jenkins

By ssh into the agent

By using FTP

curl -X POST user:token@jenkins/job/myjob/build?token=MYTOKEN is the standard way to trigger builds remotely.

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