الاستدعاءات المجدولة باستخدام EventBridge

Many tasks need to run on a timer: nightly reports, cache warming, cleanup jobs. EventBridge Scheduler triggers Lambda without any always-on server.

EventBridge supports two schedule syntaxes:

• rate() for simple intervals.
• cron() for precise calendar times.

A rate expression runs every fixed interval. For example rate(5 minutes) fires every five minutes.

Cron gives calendar precision. AWS cron has six fields: minute, hour, day-of-month, month, day-of-week, year.

The Lambda receives a JSON event describing the trigger. Scheduled events have a fixed shape with source aws.events.

Your handler ignores most of the payload and simply does its periodic work.

You attach a schedule to a Lambda as an EventBridge rule with the Lambda as its target. The CLI shows the core idea.

EventBridge must have permission to invoke your function. Add a resource policy allowing the events.amazonaws.com principal.

Classic EventBridge rules run in UTC. The newer EventBridge Scheduler supports named time zones, which avoids manual offset math.

A schedule may occasionally fire twice. Make scheduled jobs idempotent so a repeat run causes no harm.

You can disable a rule without deleting it, which is useful for pausing a job during maintenance windows.

Test your scheduling knowledge.

You can now schedule Lambda functions with EventBridge using rate and cron expressions, grant invoke permission, mind time zones, and keep jobs idempotent.