Free CJE Jenkins Installation & Configuration Questions and Answers

Question 1

What is the minimum required Java version to install Jenkins?

Accepted Answer

Java 8

Answer

Jenkins, being a Java-based application, requires a Java Runtime Environment (JRE) to function. For many years and for several stable versions, Java 8 has been the minimum required Java version to install and run Jenkins. While newer Jenkins versions support Java 11 and 17, Java 8 remains a foundational requirement for compatibility with a wide range of plugins and older installations.

Question 2

Which protocol is used by Jenkins for secure remote communication?

Accepted Answer

SSH

Answer

Jenkins uses SSH (Secure Shell) for secure remote communication, particularly when interacting with build agents (nodes) or source code management systems like Git. SSH provides encrypted communication channels, ensuring the confidentiality and integrity of data exchanged between Jenkins and its distributed components. This is a standard and robust protocol for secure automation in CI/CD pipelines.

Question 3

Where does Jenkins store its configuration files by default?

Accepted Answer

JENKINS_HOME directory

Answer

By default, Jenkins stores all its configuration files, build history, plugins, and workspace data within the JENKINS_HOME directory. This environment variable specifies the root directory for all Jenkins-related data, making it a critical location for backup, migration, and understanding the Jenkins installation's structure. It ensures all persistent data is centrally managed.

Question 4

What is the purpose of the Jenkins update center?

Accepted Answer

To provide Jenkins core and plugin updates.

Answer

The Jenkins Update Center is a centralized repository that provides updates for the Jenkins core application and its vast ecosystem of plugins. It allows Jenkins administrators to easily browse, install, and update plugins, as well as keep the Jenkins core up-to-date with the latest features, security fixes, and bug patches. This ensures the Jenkins environment remains current and functional.

Question 5

How do you configure Jenkins to run on a different port?

Accepted Answer

Use the --httpPort flag when starting Jenkins.

Answer

When starting Jenkins from the command line, you can specify the HTTP port it should listen on using the `--httpPort` flag. For example, `java -jar jenkins.war --httpPort=8081` will launch Jenkins on port 8081. This is the standard and most direct way to configure Jenkins to run on a different port during startup, allowing for flexible deployment.

CJE - Certified Jenkins Engineer Practice Test

CJE - Certified Jenkins Engineer Practice Test

Free CJE Jenkins Installation & Configuration Questions and Answers