My Python script using Paramiko runs perfectly in the IDE (PyCharm) and command line but doesn't run on AWS Lambda

Question

I'm writing a Python script (Python version 3.7 on Mac OS 10.15.7) that I intend to put on our AWS Lambda server and the script uses Paramiko. It runs perfectly fine in my IDE and on the command line, but when I try to run it on Lambda, I get this error message:

{ "errorMessage": "Unable to import module 'lambda_function': libs/bcrypt/_bcrypt.abi3.so: invalid ELF header", "errorType": "Runtime.ImportModuleError" }

I found this similar-looking question on Stack Overflow, but the answers to that question don't seem to apply to this situation as they relate to Windows and to a different Python library. But maybe there's something I missed?

Edit: Something that may be relevant is that my computer has Python 3.9 installed but I'm trying to write this in Python 3.7.

From my experience, linux usually throws an "invalid ELF header" when the operating system is missing a package, in the case of arch linux, binutils. As a side note, the question you've linked is examining a '.pyd' file, but a '.so' file is a valid ELF file, specifically a binary library meant to be linked at runtime. — J. Nolan Faught
– J. Nolan Faught, Commented Nov 20, 2020 at 1:43
@Marcin I got Paramiko onto Lambda by installing it in the directory my script is in and zipping the directory and uploading the zip to Lambda. — Walt Gottlieb
– Walt Gottlieb, Commented Nov 20, 2020 at 2:27

Walt Gottlieb · Accepted Answer · 2021-05-07 16:12:43Z

1

I solved this by creating a layer for PySFTP/Paramiko.

answered May 7, 2021 at 16:12

Walt Gottlieb

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Prithvi Boinpally · Accepted Answer · 2021-09-16 22:03:38Z

The reason this is happening is because when you ran "pip install paramiko" it installs it according to your OS and computer architecture. This may not be the same architecture as what your Lambda function is running on.

I would recommend following this guide to properly create layers to ship with Lambda functions: https://oznetnerd.com/2020/11/11/lambda-packaging-the-right-way/

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