Creating first admin user in Jenkins - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create the first admin user in Jenkins using the CLI.

Jenkins

java -jar jenkins-cli.jar -s http://localhost:8080 create-user --username [1] --password admin123 --full-name "Admin User" --email [e-mail]

Drag options to blanks, or click blank then click option'

Aroot

Buser

Cguest

Dadmin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'user' or 'guest' as the admin username causes access issues.

Using 'root' is incorrect because Jenkins does not use system usernames.

The first admin user is usually named admin in Jenkins for easy identification and default access.

2fill in blank

medium

Complete the command to create the first admin user with the Jenkins CLI specifying the server URL.

Jenkins

java -jar jenkins-cli.jar -s [1] create-user --username admin --password admin123 --full-name "Admin User" --email [e-mail]

Drag options to blanks, or click blank then click option'

Ahttp://jenkins.local:8080

Bftp://jenkins.local

Chttps://jenkins.local:22

Dfile:///var/jenkins

Attempts:

3 left

💡 Hint

Common Mistakes

Using FTP or file URLs instead of HTTP causes connection failures.

Using HTTPS without proper setup may cause errors.

The Jenkins CLI requires the HTTP URL of the Jenkins server, usually on port 8080.

3fill in blank

hard

Fix the error in the command to create the first admin user by choosing the correct option for the password flag.

Jenkins

java -jar jenkins-cli.jar -s http://localhost:8080 create-user --username admin [1] admin123 --full-name "Admin User" --email [e-mail]

Drag options to blanks, or click blank then click option'

A--pass

B--pwd

C--password

D-p

Attempts:

3 left

💡 Hint

Common Mistakes

Using short or incorrect flags like -p or --pass causes errors.

Misspelling the flag leads to command failure.

The correct flag to specify the password in Jenkins CLI is --password.

4fill in blank

hard

Fill both blanks to complete the Jenkins CLI command that creates the first admin user with username and password.

Jenkins

java -jar jenkins-cli.jar -s http://localhost:8080 create-user --username [1] [2] admin123 --full-name "Admin User" --email [e-mail]

Drag options to blanks, or click blank then click option'

Aadmin

B--password

C--pass

Duser

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect password flags like --pass.

Using wrong usernames like 'user' instead of 'admin'.

The username is admin and the correct password flag is --password.

5fill in blank

hard

Fill all three blanks to complete the Jenkins CLI command creating the first admin user with username, password flag, and email.

Jenkins

java -jar jenkins-cli.jar -s http://localhost:8080 create-user --username [1] [2] admin123 --full-name "Admin User" --email [3]

Drag options to blanks, or click blank then click option'

Aadmin

B--password

[e-mail]

[e-mail]

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong email addresses.

Using short or incorrect password flags.

The username is admin, the password flag is --password, and the email is [e-mail].

Practice

1. Why is it important to create the first admin user in Jenkins?

easy

A. To speed up the build process

B. To secure the Jenkins server by controlling access

C. To reduce the server's memory usage

D. To automatically install plugins

Solution

1. Step 1: Understand Jenkins security basics

   Jenkins requires an admin user to control who can access and manage the server.

2. Step 2: Recognize the role of the first admin user

   This user sets permissions and protects the server from unauthorized access.

3. Final Answer:

   To secure the Jenkins server by controlling access -> Option B

4. Quick Check:

   Security = Control access [OK]

Hint: First admin user controls access and security [OK]

Common Mistakes:

• Thinking admin user speeds up builds
• Confusing admin user with plugin installer
• Believing admin user reduces memory use

2. Which of the following is the correct syntax to create a new admin user using Jenkins Groovy script console?

easy

A. jenkins.createUser('admin', 'password')

B. Jenkins.instance.createUser('admin', 'password')

C. Jenkins.security.createAccount('admin', 'password')

D. jenkins.model.Jenkins.instance.securityRealm.createAccount('admin', 'password')

Solution

1. Step 1: Recall Jenkins Groovy script for user creation

   The correct method to create a user is via the securityRealm's createAccount method.

2. Step 2: Match the exact syntax

   jenkins.model.Jenkins.instance.securityRealm.createAccount('admin', 'password') is the valid syntax.

3. Final Answer:

   jenkins.model.Jenkins.instance.securityRealm.createAccount('admin', 'password') -> Option D

4. Quick Check:

   securityRealm.createAccount = correct syntax [OK]

Hint: Use securityRealm.createAccount to add users [OK]

Common Mistakes:

• Using Jenkins.instance.createUser which does not exist
• Calling jenkins.createUser directly
• Using Jenkins.security.createAccount which is invalid

3. What will be the result of running this Groovy script in Jenkins script console?

def instance = jenkins.model.Jenkins.instance
instance.securityRealm.createAccount('admin', 'admin123')

medium

A. Creates a new admin user named 'admin' with password 'admin123'

B. Throws an error because createAccount is undefined

C. Deletes the existing admin user

D. Changes the Jenkins system password

Solution

1. Step 1: Analyze the script commands

   The script gets the Jenkins instance and calls createAccount on securityRealm with username and password.

2. Step 2: Understand createAccount effect

   This method creates a new user with the given credentials in Jenkins.

3. Final Answer:

   Creates a new admin user named 'admin' with password 'admin123' -> Option A

4. Quick Check:

   createAccount adds user = Creates a new admin user named 'admin' with password 'admin123' [OK]

Hint: createAccount adds user with given name and password [OK]

Common Mistakes:

• Assuming it deletes users
• Expecting a system password change
• Thinking createAccount is undefined

4. You tried to create the first admin user with this script:

jenkins.model.Jenkins.instance.securityRealm.createAccount('admin')

Why does it fail?

medium

A. Missing password argument in createAccount method

B. Incorrect method name, should be createUser

C. Jenkins instance is not accessible in script console

D. Username 'admin' is reserved and cannot be used

Solution

1. Step 1: Check method parameters

   createAccount requires two parameters: username and password.

2. Step 2: Identify missing argument

   The script only provides username, missing the password argument, causing failure.

3. Final Answer:

   Missing password argument in createAccount method -> Option A

4. Quick Check:

   Two arguments needed = Missing password argument in createAccount method [OK]

Hint: createAccount needs username and password [OK]

Common Mistakes:

• Using wrong method name
• Assuming Jenkins instance is inaccessible
• Thinking 'admin' username is reserved

5. You want to automate creating the first admin user during Jenkins startup using an initialization Groovy script. Which approach is correct?

hard

A. Add the user credentials in config.xml directly

B. Run the createAccount command manually after Jenkins starts

C. Place a Groovy script with createAccount call in init.groovy.d directory

D. Modify Jenkins WAR file to include the user

Solution

1. Step 1: Understand Jenkins initialization scripts

   Jenkins runs Groovy scripts placed in init.groovy.d folder during startup.

2. Step 2: Automate user creation

   Placing a script with createAccount call there creates the admin user automatically on startup.

3. Final Answer:

   Place a Groovy script with createAccount call in init.groovy.d directory -> Option C

4. Quick Check:

   init.groovy.d scripts run at startup [OK]

Hint: Use init.groovy.d scripts for startup automation [OK]

Common Mistakes:

• Trying manual commands only
• Editing config.xml directly (not recommended)
• Modifying Jenkins WAR file (complex and unsafe)