Hot Reload in AWS Lambda

This is myfirst time using AWS Lambda development tool.

I use the following command to start the development server locally:

sam local start-api

If you previously run build, the reload server will not work.

Use the following command to force AWS SAM use your local version, not a build version:

sam local start-api -t template.yaml

If you changes your function, your server will be automatically reloaded.

By default, AWS SAM will pull docker image on every request. It will very slow.

Use the following command to speed up the local server:

sam local start-api -t template.yaml --skip-pull-image

This option --skip-pull-image will skip docker pulling image on every request.

That’s it. Now you have hot reload & fast local development server for AWS Lambda.