thumbnail-s3-lambda

30 Jun, 2016

AWS Lambda function that automatically generates image thumbnails on S3 upload events.

Overview

An AWS Lambda function that listens for S3 PutObject events on a media bucket. When an image is uploaded, the function retrieves it, generates a thumbnail using Pillow, and writes it back to a thumbnails/ prefix in the same bucket — preserving the original key structure.

Purpose

To automate thumbnail generation without running dedicated image-processing infrastructure. Serverless suits this workload well: it’s event-driven, bursty, and the processing time per image is short.

Stack

Runtime: AWS Lambda (Python 2.7)
Trigger: S3 PutObject event (prefix: media/)
Image processing: Pillow
Storage: S3 — source images and generated thumbnails in the same bucket
Deployment: Zip upload to Lambda console

Python
AWS Lambda
S3
Serverless
#open-source
#aws
#serverless