Can I make an Amazon AWS Lamda function which is triggered by the creation of an S3 bucket?

Question

I would like to send a mail when a new bucket is created on our AWS account. I'd prefer this to be near-instantaneous so preferably not time scheduled, but triggered by the CreatBucket event directly.

When I try to create a new function and configure an S3 trigger, the bucket selection is mandatory

Answer 1

EDIT

As @michael-sqlbot has pointed out in the comments, what you are trying to achieve may be possible but with a multi-step process. CloudTrail can log S3 bucket-level events (https://docs.aws.amazon.com/AmazonS3/latest/dev/cloudtrail-logging.html) including bucket creation, it can then be configured to generate CloudWatch events, and finally you can use specific CloudWatch events as triggers for Lambda.

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This isn't directly supported, here is the list of all events that can be generated by S3:

• s3:ObjectCreated:*
• s3:ObjectCreated:Put
• s3:ObjectCreated:Post
• s3:ObjectCreated:Copy
• s3:ObjectCreated:CompleteMultipartUpload

Amazon S3 APIs such as PUT, POST, and COPY can create an object. Using these event types, you can enable notification when an object is created using a specific API, or you can use the s3:ObjectCreated:* event type to request notification regardless of the API that was used to create an object.

You will not receive event notifications from failed operations.

• s3:ObjectRemoved:*
• s3:ObjectRemoved:Delete
• s3:ObjectRemoved:DeleteMarkerCreated

By using the ObjectRemoved event types, you can enable notification when an object or a batch of objects is removed from a bucket.

You can request notification when an object is deleted or a versioned object is permanently deleted by using the s3:ObjectRemoved:Delete event type. Or you can request notification when a delete marker is created for a versioned object by using s3:ObjectRemoved:DeleteMarkerCreated. For information about deleting versioned objects, see Deleting Object Versions. You can also use a wildcard s3:ObjectRemoved:* to request notification anytime an object is deleted.

You will not receive event notifications from automatic deletes from lifecycle policies or from failed operations.

• s3:ReducedRedundancyLostObject

You can use this event type to request Amazon S3 to send a notification message when Amazon S3 detects that an object of the RRS storage class is lost.

All events work at an object level, requiring the bucket exist.

Source: https://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html#supported-notification-event-types.