Agent availability and offline handling in Jenkins - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Jenkins agent?

A Jenkins agent is a machine or environment that runs jobs assigned by the Jenkins master. It helps distribute workload and run builds or tests.

beginner

What does it mean when a Jenkins agent is offline?

An offline agent is not connected to the Jenkins master and cannot run any jobs until it reconnects.

intermediate

How can Jenkins handle an agent that goes offline during a build?

Jenkins can retry the build on another available agent or mark the build as failed depending on the configuration.

intermediate

What is the purpose of the 'Availability' setting for a Jenkins agent?

It controls when the agent should be online or offline, such as always online, only when jobs are assigned, or manually controlled.

beginner

How can you manually bring a Jenkins agent back online?

In the Jenkins UI, go to the agent's page and click the 'Launch agent' or 'Bring Online' button to reconnect it to the master.

What happens when a Jenkins agent goes offline?

A It stops running jobs until it reconnects

B It continues running jobs normally

C It automatically deletes all jobs

D It becomes the Jenkins master

An offline agent cannot run jobs until it reconnects to the Jenkins master.

Which Jenkins feature helps manage when an agent is online or offline?

A Job Parameters

B Agent Availability settings

C Pipeline Syntax

D Build Triggers

Agent Availability settings control when agents are online or offline.

If an agent goes offline during a build, what can Jenkins do?

A Delete the build history

B Ignore the failure and continue

C Automatically restart the Jenkins master

D Retry the build on another agent or fail the build

Jenkins can retry the build on another agent or mark it as failed depending on configuration.

How do you manually bring a Jenkins agent back online?

A Click 'Bring Online' in the agent's Jenkins UI page

B Restart the Jenkins master

C Delete and recreate the agent

D Run a Jenkins pipeline

You can manually reconnect an agent by clicking 'Bring Online' in its Jenkins UI page.

What is the role of a Jenkins agent?

A To manage user permissions

B To store Jenkins configuration files

C To run jobs assigned by the Jenkins master

D To host the Jenkins web interface

Jenkins agents run jobs assigned by the Jenkins master to distribute workload.

Explain what happens when a Jenkins agent goes offline and how Jenkins handles it.

Think about connection and job execution.

Describe how to manually bring a Jenkins agent back online and why you might need to do this.

Focus on manual reconnection steps.