sam local start-api Container Image Volume Mount Example

This demos a hacky way to get around SAM CLI's current shortfall with volume mounts.

1. Spin up your function with docker or docker compose. Make sure it has the Lambda Runtime Interface Emulator.
2. Use sam to spin up a proxy to call your function.
3. Use template.prod.yaml for deployments and to spin up your function without mount.

Mount volumes however you need to in your docker-compose file.

docker-compose up
sam local start-api --parameter-overrides HostIP=<Your Host IP>

Read Only

Note, it's best to mount all volumes as readonly except for a mount to /tmp to replicate Lambda.