Building Applications with Dependencies
You can use the sam build command to compile
dependencies for Lambda functions written in Python. For example, if you write code
that
uses Python packages, such as a graphics library for image processing, you need to
create a deployment package that works on the Amazon Linux AMI. The sam
build command allows you to easily create deployment artifacts that target
Lambda's execution environment, so that the functions you build locally run in a similar
environment in the AWS Cloud.
The sam build command iterates through the functions in your application,
looks for a manifest file (such as requirements.txt) that contain the
dependencies, and automatically creates deployment artifacts that you can deploy to
Lambda
using the sam package and sam deploy commands.
If your Lambda function depends on packages that have natively compiled programs,
you
can use the --use-container flag. The --use-container flag
compiles your functions in a Lambda-like environment locally, so they are in the right
format when you deploy them to the AWS Cloud.
Examples:
# Build a deployment package $ sam build # Run the build process inside an AWS Lambda-like Docker container $ sam build --use-container # Build and run your functions locally $ sam build && sam local invoke # Build and package for deployment $ sam build && sam package --s3-bucket <bucketname> # For more options $ sam build --help