Knative Function Using the AWS Lambda Runtime API
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Running AWS Lambda Custom Runtime in Knative

In November 2018, AWS announced support for Lambda custom runtime using a straightforward AWS lambda runtime API.

In this repository you find a function invoker implemented in Go, which provides the AWS Lambda runtime API. You also find a Knative build template. Using this build template you can run AWS Lambda custom runtimes directly in your Kubernetes cluster using Knative.

The AWS Lambdas execution environment is replicated using the Docker image amazonlinux and some environment variables.

AWS custom runtime walkthrough

This repository contains an example lambda function written in bash with a AWS custom runtime described in this AWS tutorial. To run this function use our tm client to talk to the knative API.

  1. Install AWS custom runtime buildtemplate:
tm deploy buildtemplate -f
  1. Deploy function:
tm deploy service lambda-bash -f --build-template aws-custom-runtime --build-argument DIRECTORY=example --wait

In output you'll see URL that you can use to access example/ function

AWS Lambda RUST example

RUST custom runtime is also verified to be compatible with this buildtemplate. Though official readme has build instructions, it is more convenient to use docker.

  1. Clone repository:
git clone
cd aws-lambda-rust-runtime
  1. Build binary and rename it to bootstrap:
docker run --rm --user "$(id -u)":"$(id -g)" -v "$PWD":/usr/src/myapp -w /usr/src/myapp rust:1.31.0 cargo build -p lambda_runtime --example basic --release
mv target/release/examples/basic target/release/examples/bootstrap
  1. Deploy buildtemplate function using tm CLI:
tm deploy buildtemplate -f
tm deploy service lambda-rust -f target/release/examples/ --build-template aws-custom-runtime

Use your RUST AWS Lambda function on knative:

curl --data '{"firstName": "Foo"}'
{"message":"Hello, Foo!"}

AWS Lambda C++ example

  1. Build custom runtime:
cd /tmp
git clone
cd aws-lambda-cpp
mkdir build
cd build
make && make install
  1. Prepare example function:
mkdir /tmp/hello-cpp-world
cd /tmp/hello-cpp-world

cat > main.cpp <<EOF
// main.cpp
#include <aws/lambda-runtime/runtime.h>

using namespace aws::lambda_runtime;

invocation_response my_handler(invocation_request const& request)
   return invocation_response::success("Hello, World!", "application/json");

int main()
   return 0;

cat > CMakeLists.txt <<EOF
cmake_minimum_required(VERSION 3.5)
project(bootstrap LANGUAGES CXX)

find_package(aws-lambda-runtime REQUIRED)
add_executable(\${PROJECT_NAME} "main.cpp")
target_link_libraries(\${PROJECT_NAME} PUBLIC AWS::aws-lambda-runtime)
  1. Build function:
mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=/tmp/out
  1. Deploy with tm CLI:
tm deploy buildtemplate -f
tm deploy service lambda-cpp -f . --build-template aws-custom-runtime

C++ Lambda function is running on knative platform:

curl --data '{"payload": "foobar"}'
Hello, World!


We would love your feedback on this tool so don't hesitate to let us know what is wrong and how we could improve it, just file an issue

Code of Conduct

This plugin is by no means part of CNCF but we abide by its code of conduct