Rust for AWS Lambda, the Docker Way
Rust is a great language to consider when writing services for AWS Lambda, because of its extremely low start-up time, CPU usage and memory footprint. These are all important metrics to consider in serverless infrastructure and they translate to direct cost savings and better performance when minimized.
The recommended and most straightforward way to deploy Rust programs to AWS Lambda is to upload a zipped binary, either through the AWS CLI or with the amazing Cargo Lambda. While the latter makes the process of testing, compiling and deploying Rust Lambdas very easy, there is sometimes the need to distribute a Docker image instead of the raw binary. For instance, using container images allows to leverage the ECR container registry in AWS for versioning and distribution.
In this short article, we’ll see how we can leverage Cargo Lambda and Docker to create an image suitable for use with Lambda.
