Prevent Image Build/Rebuild for sam local start-api ?

[kPOWz]

We love sam local start-api, it has allowed us to change some developer workflows that mean a lot for our DUX/quality of life.

We are leveraging sam local start-api with a CDKv2 IaC setup

We've noticed over time when we send a succession of API calls to the SAM local URL/server, the Docker container is rebuilt each time. Is this necessary ? Is there any built in way/option to avoid this?

Scenario:
An api with 5 endpoints running locally via sam local start-api
issue 1 API call to each of the 5 endpoints back to back

Current:
Container is created & exits 5 times
example:
Invoking src.handler.handler (python3.10)
PowertoolsLayer17979D4B is a local Layer in the template
cvmlinspectingservicecommonsA6DCC1FF is a local Layer in the template
Building image............................
Using local image: samcli/lambda-python:3.10-arm64-3de4efa8f0a02d608ba35a629.

Desired:
Container is created & exits 1 times

[hawflau]

Hey @kPOWz thanks for raising the issue. I've transferred the issue here (aws/aws-sam-cli) since this is a CLI-specific question.

sam local start-api creates one container for each Lambda Function defined in your template. Are your 5 endpoints pointing to 5 different Lambda Functions? If so, this is why you saw 5 containers are created. You can use --warm-containers EAGER to create all containers at startup. Or --warm-containers LAZY to prevent created containers from exiting. See here for more info.

Please let us know if you have further question.

[hnnasit]

Closing this issue since it has been inactive for a while. Please feel free to try out @hawflau's suggestions and one a new issue if you still have questions/concerns.

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