Lambda Docker Build GO - RIE:no such file or directory

Question

Iam trying to build a lambda docker image for a golang function, after reading through the docs on AWS I copied the example dockerfile provided using the recommended base image of lambda/provided:al2

Changed the first base image that provides the golang runtime to match local golang runtime of 1.19.

Dockerfile:

FROM golang:1.19 as build
WORKDIR /app

COPY go.mod go.sum ./
RUN go mod download

COPY . .

RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o main

FROM public.ecr.aws/lambda/provided:al2

COPY --from=build /app/main ./main
ENTRYPOINT [ "./main" ]

After a successful build I run this command (from aws docs): docker run -d -v ~/.aws-lambda-rie:/aws-lambda -p 9000:8080 --entrypoint /aws-lambda/aws-lambda-rie go-test-image:latest ./main

Which returns the error: Error response from daemon: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: "/aws-lambda/aws-lambda-rie": stat /aws-lambda/aws-lambda-rie: no such file or directory: unknown.

but reading the docs the AWS provided image already includes the aws-lambda-rie

I have also tried to run: docker run -p 9000:8080 go-test-image:latest

which returns errors of missing lambda environment variables:

 expected AWS Lambda environment variables [_LAMBDA_SERVER_PORT AWS_LAMBDA_RUNTIME_API]

Any ideas of what I am missing on this, or cause of these errors.

Answer 1

but reading the docs the AWS provided image already includes the aws-lambda-rie

It is included, but seems to be referenced incorrectly in the docs.

Digging around inside the image, there is /lambda-entrypoint.sh which references /usr/local/bin/aws-lambda-rie.

You can use that directly as the docs suggest.

Edit: The below does not work. /lambda-entrypoint.sh references /var/runtime/bootstrap, which I expect is only included in AWS base images for specific languages. As we're using Go, the compiled executable is the runtime.

, or instead, make use of /lambda-entrypoint.sh as your entrypoint:

ENTRYPOINT [ "/lambda-entrypoint.sh", "./main" ]

/lambda-entrypoint.sh detects when your container is running locally and makes use of the RIE. If your container is running in the cloud, it executes the Lambda runtime bootstrap script directly.