AWS CloudFront Behavior

Question

I've been setting up aws lambda functions for S3 events. I want to set up a new structure for my bucket, but it's not possible--so I set up a new bucket the way I want and will migrate old things and send new things there. I wanted to have some of the structure the same under a given base folder name old-bucket/images and new-bucket/images . I set up CloudFront to serve from old-bucket/images now, but I wanted to add new-bucket/images as well. I thought the behavior tab would set it such that it would check the new-bucket/images first then old-bucket/images . Alas, that didn't work. If the object wasn't found in the first, that was the end of the line.

Am I misunderstanding how behaviors work? Has anyone attempted anything like this?

Answer 1

That is expected behavior. An origin tells Amazon CloudFront where to obtain the data to serve to users, based upon a prefix, suffix, etc.

For example, you could serve old-bucket/* from one Amazon S3 bucket, while serving new-bucket/* from a different bucket.

However, there is no capability to 'fall-back' to a different origin if a file is not found.

You could check for the existence of files before serving the link, and then provide a different link depending upon where the files are stored. Otherwise, you'll need to put all of your files in the location that matches the link you are serving.