Triggers directive in Jenkins - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the triggers directive in a Jenkins pipeline?

The triggers directive is used to automatically start a Jenkins pipeline based on specific events or schedules, like a timer or a source code change.

beginner

How do you schedule a Jenkins pipeline to run every day at midnight using the triggers directive?

Use the cron trigger inside triggers with the schedule 0 0 * * * to run the pipeline daily at midnight.

intermediate

What is the syntax to trigger a Jenkins pipeline when a GitHub push event occurs?

Use the pollSCM trigger or configure a webhook in GitHub. In declarative pipeline, pollSCM can be set inside triggers to check for changes.

intermediate

Can you use multiple triggers inside the triggers directive? Give an example.

Yes, you can combine triggers like cron and pollSCM inside triggers to run pipelines on schedule and on source changes.

beginner

What happens if you omit the triggers directive in a Jenkins pipeline?

The pipeline will not start automatically. It must be started manually or triggered by other means outside the pipeline script.

Which Jenkins pipeline directive is used to automatically start a job on a schedule?

A triggers

B environment

C stages

D steps

The triggers directive defines automatic start conditions like schedules.

What cron expression runs a Jenkins pipeline every hour?

A 0 * * * *

B * 0 * * *

C 0 0 * * *

D * * * * 0

The expression 0 * * * * runs the job at minute 0 of every hour.

Which trigger checks for source code changes in Jenkins?

A cron

B timer

C pollSCM

D manual

The pollSCM trigger polls the source control for changes.

Can you combine multiple triggers inside the triggers directive?

A Triggers cannot be used in pipelines

B No, only one trigger is allowed

C Only cron triggers can be combined

D Yes, multiple triggers can be combined

Multiple triggers like cron and pollSCM can be used together.

What happens if no triggers directive is defined in a Jenkins pipeline?

A Pipeline runs automatically every minute

B Pipeline runs only when started manually

C Pipeline fails to run

D Pipeline runs on every code commit

Without triggers, the pipeline must be started manually or by other external means.

Explain how the triggers directive works in Jenkins pipelines and give an example of a scheduled trigger.

Think about how to run a job every day without clicking start.

Describe how you can trigger a Jenkins pipeline when code changes happen in a Git repository.

Consider how Jenkins knows when new code is pushed.