Jenkins WAR file execution - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the Jenkins WAR file?

The Jenkins WAR file is a single executable file that contains the entire Jenkins application. It can be run directly with Java to start Jenkins without needing a separate installation.

beginner

How do you start Jenkins using the WAR file?

You start Jenkins by running the command: java -jar jenkins.war. This launches Jenkins on the default port 8080.

intermediate

How can you change the port Jenkins runs on when using the WAR file?

Use the command java -jar jenkins.war --httpPort=9090 to run Jenkins on port 9090 instead of the default 8080.

beginner

What happens when you run java -jar jenkins.war for the first time?

Jenkins starts and creates initial setup files. It shows a URL with an initial admin password stored in a file. You use this password to unlock Jenkins in the browser.

beginner

How do you stop Jenkins when running from the WAR file?

You can stop Jenkins by pressing Ctrl+C in the terminal where Jenkins is running. This safely shuts down the server.

Which command starts Jenkins using the WAR file on the default port?

A jenkins start

B java -jar jenkins.war

C java jenkins.war

D start-jenkins

The correct command is java -jar jenkins.war to start Jenkins from the WAR file.

How do you specify a custom port when running Jenkins WAR?

A java -jar jenkins.war --port=9090

B java -jar jenkins.war -port 9090

C java -jar jenkins.war -p 9090

D java -jar jenkins.war --httpPort=9090

The correct syntax to change port is --httpPort=9090.

What file contains the initial admin password after first Jenkins WAR run?

A secrets/initialAdminPassword

B jenkins.log

C config.xml

D admin.password

The initial admin password is stored in secrets/initialAdminPassword inside the Jenkins home directory.

How do you stop Jenkins running from the WAR file?

A Run 'jenkins stop' command

B Close the browser

C Press Ctrl+C in the terminal

D Restart the computer

Pressing Ctrl+C in the terminal safely stops Jenkins.

What port does Jenkins use by default when started with the WAR file?

A 8080

B 443

C 9090

D 80

Jenkins runs on port 8080 by default when started with the WAR file.

Explain how to start Jenkins using the WAR file and how to access it in a browser.

Think about the command, port, and first-time setup steps.

Describe how to change the port Jenkins runs on when using the WAR file and how to stop Jenkins safely.

Focus on command options and stopping Jenkins.