S3 定价与 aws Lambda

Question

Do I get charged for transfer from S3 to aws Lambda?

For example a user uploads a file client side to my S3 bucket. My aws lambda retrieves the file to generate thumbnails. Does that count as S3 out to internet or S3 to cloudfront or something else?

Lambda and S3 are in the same region.

Answer 1

No. There is no Data Transfer charge between an AWS Lambda function and Amazon S3 in the same region.

From AWS Lambda – Pricing :

Data transferred between Amazon S3... and AWS Lambda functions in the same AWS Region is free.

However, if your Lambda function is configured to use a VPC , there will be a small (1c/GB) charge for traffic exiting the VPC. This traffic would be routed through a NAT Gateway, which has a public IP address.

From EC2 Instance Pricing – Amazon Web Services (AWS) :

IPv4: Data transferred “in” to and “out” from public or Elastic IPv4 address is charged at $0.01/GB in each direction.

This charge does NOT apply if the Lambda function connects to the Internet directly (by NOT connecting to a VPC).

Answer 2

If Lambda reads/writes data from S3 you will be billed for requests and data stored.

for example: PUT, COPY, POST, LIST requests (per 1,000 requests) - $0.005

GET, SELECT, and all other requests (per 1,000 requests) - $0.0004

Prices in different regions change slightly.

Answer 3

To access the s3 object using lambda you will be leveraging some API ie boto3 or JAVA SDK or aws cli. So when you run get_object or download_file you will be charged for the amount of data you scanned and the amount of data returned. ALthough the amount is so minimal that it doesn't impact billing that much but still you are charged.