S3 Bucket costs using Lambda

A lambda function to list S3 buckets and their sizes.

Permissions

An IAM user is required for Terraform to create this project in the AWS account.

Follow the steps in Permission Details to create an IAM user in your AWS account

Packaging the Lambda Function

Before deploying, you need to package your Lambda function code (lambda_function.py) into a .zip file:

zip lambda.zip lambda_function.py

Deploy the Terraform Configuration

terraform init
terraform apply

Summary log

A log will be written to an s3 bucket. The output will look something like this:

Summary as of 2024-01-01 08:00:00 UTC

Bucket: ec2-webserver-logs-bucket, Size: 23.34 GB, Location: eu-west-1
Bucket: my-test-bucket, Size: 0.29 GB, Location: None

Esimated running costs

Assuming the lambda runs once a month and takes 60 minutues to run:

 Name                            Monthly Qty  Unit         Monthly Cost

 aws_lambda_function.s3_summary
 ├─ Requests                          0.0000  1M requests         $0.00  *
 └─ Duration (first 6B)                  450  GB-seconds          $0.01  *

 OVERALL TOTAL                                                    $0.01

*Usage costs were estimated using infracost-usage.yml, see docs for other options.

──────────────────────────────────
6 cloud resources were detected:
∙ 1 was estimated
∙ 5 were free

┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━┓
┃ Project                                            ┃ Baseline cost ┃ Usage cost* ┃ Total cost ┃
┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╋━━━━━━━━━━━━━━━╋━━━━━━━━━━━━━╋━━━━━━━━━━━━┫
┃ main                                               ┃ $0.00         ┃ $0.01       ┃ $0.01      ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┻━━━━━━━━━━━━━━━┻━━━━━━━━━━━━━┻━━━━━━━━━━━━┛