AWS is deprecating the go1.x runtime on Lambda and it’s time to udpate your Golang lambda functions. Functions need to migrate to the al2.provided runtime and it’s pretty straight-forward. In the AWS console select al2.provided as the new runtime and when you compile your Golang handler you need to create an executable named bootstrap.

Here’s a sample Golang lambda program:

package main

import (
  "context"
  "fmt"

  "github.com/aws/aws-lambda-go/lambda"
)

type MyEvent struct {
  Name string `json:"name"`
}

func HandleRequest(ctx context.Context, event MyEvent) (string, error) {
  return fmt.Sprintf("Hello from Lambda, %s!", event.Name), nil
}

func main() {
  lambda.Start(HandleRequest)
}

Build it (this is for Graviton - if you (have to) use Intel then use GOARCH=amd64):

GOARCH=arm64 GOOS=linux go build -o bootstrap .

Zip up the executable (and anything related that is needed):

zip myFunction.zip bootstrap

And now you can use that zip to deploy your function.