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Add environment variable for --runtime-interface-emulator-address #120

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Description

@shaicoleman

At the moment it's not possible to configure the runtime interface emulator address without patching the docker image.

The default is 0.0.0.0:8080 , and I would like to restrict it to the local network for security reasons.

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  1. valerena commented on May 2, 2024

    @valerena
    Contributor

    Hi. There is already a parameter that you can pass called --runtime-interface-emulator-address

    (Definition and Example usage in the tests)

    Is this what you're looking for?

  2. shaicoleman commented on May 2, 2024

    @shaicoleman
    Author

    The lambda-entrypoint.sh looks like this (taken from public.ecr.aws/lambda/ruby:3.3-x86_64):

    #!/bin/sh
    # Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
    
    if [ $# -ne 1 ]; then
      echo "entrypoint requires the handler name to be the first argument" 1>&2
      exit 142
    fi
    export _HANDLER="$1"
    
    RUNTIME_ENTRYPOINT=/var/runtime/bootstrap
    if [ -z "${AWS_LAMBDA_RUNTIME_API}" ]; then
      exec /usr/local/bin/aws-lambda-rie $RUNTIME_ENTRYPOINT
    else
      exec $RUNTIME_ENTRYPOINT
    fi

    The command line parameters passed to aws-lambda-rie are hard coded, so there's no easy way to adjust those parameters. At the moment I need to create a docker image with a patched lambda-entrypoint.sh which is a lot more work than setting an environment variable.

  3. valerena commented on May 2, 2024

    @valerena
    Contributor

    Ok. I understand what's the use case now.

    If you want to make a contribution, we would be happy to review and merge. It should be something similar to how the logLevel is handled that can be passed as a parameter or as an env var: https://github.com/aws/aws-lambda-runtime-interface-emulator/blob/develop/cmd/aws-lambda-rie/main.go#L44-L48 (plus tests)

    In any case, we'll take this into consideration and see when we can take this.

  4. shaicoleman commented on Jul 23, 2024

    @shaicoleman
    Author

    @valerena , could you look into adding it?

  5. valerena commented on Aug 1, 2024

    @valerena
    Contributor

    Hi @shaicoleman. I don't have enough bandwidth to submit the changes myself at the moment, but I could help reviewing code if you want to send a PR.

  6. added a commit that references this issue on Sep 17, 2025
    5f17c1c
  7. cnaples79 commented on Sep 17, 2025

    @cnaples79

    I've added a PR for this issue.

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