Is there a way to automatically share objects from one S3 bucket to another by file name?

Question

So in my company theres two S3 buckets, one stores all of the reports and another is supposed to store a particular type of report called accountingEOMReport which is ran once a month, right now we're trying to pull the EOM reports from bucket 1 but the code isn't saving it there, instead it's saving to bucket 4 (this wasn't a problem before and only started after we began using S3). What I want to do is create some sort of policy rule or Lambda function to automatically search bucket for for a particular type of file name (eg EOMReport or something like that) and move those to bucket 1, maybe once per day or a few times a week. This report is run once or a few times a month so maybe to the storage option that works best for that but that can still be retrieved within a few hours max worst case scenario.

Answer 1

You can:

• Configure the Amazon S3 bucket to trigger an AWS Lambda function whenever a new object is created
• You could then code the AWS Lambda function to check the name of the object that was created. If it is an EOMReport, then the Lambda function should:
  • Copy the object to the other bucket
  • Delete the original object (if desired)

This will happen immediately upon creation of the object, so there is no need to schedule it. AWS Lambda is charged per-millisecond and there is a monthly Free Tier for AWS Lambda. As a result, this solution will likely not cost you anything.