I'm diving into a project where I'm pulling chess game data into S3 to trigger a Lambda function meant to evaluate the accuracy of these games and generate CSV files for analysis. I'm trying to use Stockfish for this, but I've run into a snag. I uploaded Stockfish as a Lambda layer, but I keep getting a long error message in CloudWatch logs starting with:
[ERROR] PermissionError: [Errno 13] Permission denied: '/opt/bin/stockfish'. It seems to happen when I try to initialize the engine in my lambda function. I'm really new to AWS and this is my first project after some labs, so any help pointing me toward a correctly compiled Stockfish layer or another solution would be greatly appreciated!
1 Answer
It looks like your Lambda layer is missing the execute permissions on the Stockfish executable. To fix this, you need to run a `chmod +x` on the Stockfish binary before you package and upload the layer. If you have access to your local version of the code, make sure to do this and then recreate the layer with the correct permissions. That should solve the permission error you're seeing!
Thanks for the tip! I’m not really familiar with those commands or Linux, though. Is there a simpler way to set those permissions or create a Stockfish layer? I'm a bit lost with all this.