AWS Sam Deployed Golang lambda functions runtime error

Question

I have golang lambda functions deployed via aws sam.  I followed the guide for compiling for the provided.al2 runtime, yet I am getting the following error:
Error: fork/exec /var/task/bootstrap: exec format error
Runtime.InvalidEntrypoint

Sam Template looks like this:

```
UserPutFunction:
    Type: AWS::Serverless::Function 
    Metadata:
      BuildMethod: makefile
    Properties:
      CodeUri: ./
      Handler: bootstrap
      Runtime: provided.al2
      Architectures:
        - arm64
      Events:
        CatchAll:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /user
            Method: POST
```
And the Makefile is this:
```
build-UserPutFunction:
	set GOOS=linux
	set GOARCH=amd64
	go build -o $(ARTIFACTS_DIR)\bootstrap ./lambda/user/user_put
```
Am I missing something?

Answer

Hello.

The error is caused by a problem with the architecture of the container image.  
In this case, amd64 is used in Makefile.  
So, I think you need to set Architectures to "x86_64".  
https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-resource-function.html#sam-function-architectures
```
UserPutFunction:
    Type: AWS::Serverless::Function 
    Metadata:
      BuildMethod: makefile
    Properties:
      CodeUri: ./
      Handler: bootstrap
      Runtime: provided.al2
      Architectures:
        - x86_64
      Events:
        CatchAll:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /user
            Method: POST
```

AWS Sam Deployed Golang lambda functions runtime error

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