Jenkins Jenkins Build Triggers and Scheduling 2

Question 1

In Jenkins Pipeline, which directive is used to define build triggers in a Declarative Pipeline?

Accepted Answer

triggers {}

Answer

The 'triggers {}' directive inside a Declarative Pipeline's pipeline block is used to define automated triggers like cron, pollSCM, or upstream.

Question 2

What Jenkins Pipeline trigger syntax polls the SCM every 10 minutes?

Accepted Answer

pollSCM('H/10 * * * *')

Answer

The pollSCM trigger in a Declarative Pipeline accepts a cron string that defines how often Jenkins checks the repository for changes.

Question 3

Which Jenkins feature allows a build to be triggered automatically when a pull request is opened in GitHub?

Accepted Answer

GitHub Pull Request Builder plugin

Answer

The GitHub Pull Request Builder plugin listens for GitHub webhook events for PR creation and triggers Jenkins builds for validation.

Question 4

If you want a Jenkins job to run only on weekdays (Monday through Friday) at 6 AM, what cron expression would you use?

Accepted Answer

0 6 * * 1-5

Answer

In cron format, '0 6 * * 1-5' means minute 0, hour 6, any day/month, and weekdays 1-5 (Monday through Friday).

Question 5

What happens in Jenkins when both 'Poll SCM' and a webhook are configured for the same job?

Accepted Answer

Both can trigger builds; the webhook triggers immediately while Poll SCM serves as a fallback

Answer

Having both configured is a valid setup; webhooks provide immediate triggers while Poll SCM can catch cases where webhooks fail to deliver.

Jenkins Practice Test