"PathError" when deploying Go project to AWS Lambda

Question

When deploying this Go-based AWS Lambda project, via AWS console, I receive:

{
  "errorMessage": "fork/exec /var/task/main: exec format error",
  "errorType": "PathError"
}

Here are the steps I took:

downloaded the marriage-master project from Git
in Terminal, go get "github.com/aws/aws-lambda-go/lambda" so the script is buildable by Go
in Terminal, go build main.go to create file Lambda will use to execute
in Terminal, zip main.zip main to archive the file into a .zip for deployment to Lambda
in AWS Console, upload main.zip to Function code

But I keep getting this path error. Any idea what I'm doing wrong?

What OS are you running on? If you're running on Windows or macOS, did you make sure to build a Linux binary? — Adrian, Jul 15 '20 at 16:42
I'm on MacOS 10.15.6 (19G60d), and no I don't think I did. Do you have instructions you can share? — user53526356, Jul 15 '20 at 17:40
No but Amazon does: https://docs.aws.amazon.com/lambda/latest/dg/golang-package.html — Adrian, Jul 15 '20 at 17:41

score 12 · Accepted Answer · edited Jul 15 '20 at 17:45

12

To deploy a Go app in AWS Lambda, run the following commands:

Build the binary targeted to Linux OS and amd64 architecture

GOARCH=amd64 GOOS=linux go build main.go -ldflags="-s -w"
Zip the binary

zip lambda.zip main
Upload this binary from AWS Lambda console directly or Put it in an S3 bucket and import it.

You have taken care of the lambda configuration already.

edited Jul 15 '20 at 17:45

Dharman

answered Jul 15 '20 at 17:40

Mayank Patel

I get `can't load package: named files must be .go files: -ldflags=-s -w` – user53526356 Jul 15 '20 at 17:48
try removing main.go? GOARCH=amd64 GOOS=linux go build -ldflags="-s -w" – Mayank Patel Jul 15 '20 at 17:53
That gets rid of the error, but then when I zip the binary, I get `zip warning: name not matched: main zip error: Nothing to do! (main.zip)` – user53526356 Jul 15 '20 at 18:16
1

Check your binary name @MSD. – Mayank Patel Jul 15 '20 at 18:23

score 7 · Answer 2 · edited Mar 16 '21 at 16:44

7

Try without flags:

GOARCH=amd64 GOOS=linux go build main.go

edited Mar 16 '21 at 16:44

Tomerikoo

answered Mar 16 '21 at 15:40

score 3 · Answer 3 · answered May 03 '22 at 22:00

3

Do this GOARCH=amd64 GOOS=linux go build main.go worked for me.

answered May 03 '22 at 22:00

Titanium

score 2 · Answer 4 · answered Aug 25 '21 at 19:50

2

My issue was the package name wasn't named main

answered Aug 25 '21 at 19:50

Zzeks

4 Answers4