Can EFS be used as an event source for triggering a Lambda function?

Question

I’ve successfully created a Lambda function that can be triggered by an S3 file upload to a certain bucket and then downloads that file to EFS. I was wondering if the opposite workflow is possible, such that, a file uploaded to a given EFS directory would trigger Lambda to upload that file to S3?

For instance, in the serverless.yml or CloudFormation template I use to deploy the former workflow, the trigger event is defined as s3:ObjectCreated:*, but is there an equivalent for EFS?

If not, what is a good alternative solution for this workflow, setting up a trigger via CloudWatch?

score 4 · Accepted Answer · answered Mar 13 '21 at 04:30

4

There is not an equivalent of S3 trigger for EFS. Inotify will not work with EFS either.

You could set up an EventBridge scheduled event that triggers a lambda to scan an EFS folder periodically, but it can become costly.

answered Mar 13 '21 at 04:30

jingx

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I see, so this can only be set up using a schedule-based rule rather than a pattern-based rule for EventBrige? – claudiadast Mar 22 '21 at 20:42
Yeah, EventBridge or CloudWatch scheduled events are basically cron jobs. – jingx Mar 23 '21 at 00:28

Can EFS be used as an event source for triggering a Lambda function?

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