So I'm trying to create an aws lambda function, to log in to an instance and do some stuff. And the script works fine outside of lambda, but when I package it using the same instructions as this https://aws.amazon.com/blogs/compute/scheduling-ssh-jobs-using-aws-lambda/ it doesn't work. It throws this error.

libffi-72499c49.so.6.0.4: cannot open shared object file: No such file or directory: ImportError
Traceback (most recent call last):
  File "/var/task/lambda_function.py", line 12, in lambda_handler
    key = paramiko.RSAKey.from_private_key(key)
  File "/var/task/paramiko/pkey.py", line 217, in from_private_key
    key = cls(file_obj=file_obj, password=password)
  File "/var/task/paramiko/rsakey.py", line 42, in __init__
    self._from_private_key(file_obj, password)
  File "/var/task/paramiko/rsakey.py", line 168, in _from_private_key
    self._decode_key(data)
  File "/var/task/paramiko/rsakey.py", line 173, in _decode_key
    data, password=None, backend=default_backend()
  File "/var/task/cryptography/hazmat/backends/__init__.py", line 35, in default_backend
    _default_backend = MultiBackend(_available_backends())
  File "/var/task/cryptography/hazmat/backends/__init__.py", line 22, in _available_backends
    "cryptography.backends"
  File "/var/task/pkg_resources/__init__.py", line 2236, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/var/task/cryptography/hazmat/backends/openssl/__init__.py", line 7, in <module>
    from cryptography.hazmat.backends.openssl.backend import backend
  File "/var/task/cryptography/hazmat/backends/openssl/backend.py", line 15, in <module>
    from cryptography import utils, x509
  File "/var/task/cryptography/x509/__init__.py", line 7, in <module>
    from cryptography.x509.base import (
  File "/var/task/cryptography/x509/base.py", line 15, in <module>
    from cryptography.x509.extensions import Extension, ExtensionType
  File "/var/task/cryptography/x509/extensions.py", line 19, in <module>
    from cryptography.hazmat.primitives import constant_time, serialization
  File "/var/task/cryptography/hazmat/primitives/constant_time.py", line 9, in <module>
    from cryptography.hazmat.bindings._constant_time import lib
ImportError: libffi-72499c49.so.6.0.4: cannot open shared object file: No such file or directory

The zip commands in that tutorial are missing a parameter. I ran into this exact problem today with pysftp, which is built on paramiko. libffi-72499c49.so.6.0.4 is in a hidden dot directory inside lib64/python2.7/site-packages/.libs_cffi_backend. Depending on how you zipped up the dependencies in your virtualenv, you may have inadvertantly excluded this directory.

1. First, make sure libffi-devel and openssl-devel are installed on your Amazon Linux instance, otherwise the cryptography module may not be compiling correctly.

   sudo yum install libffi-devel openssl-devel
   

If those packages were not installed before, delete and rebuild your virtualenv.

2. Make sure that when you are zipping up your site-packages that you use '.' instead of '*', otherwise you will not be including files and directories that are hidden because their names begin with a period.

   cd path/to/my/helloworld-env/lib/python2.7/site-packages
   zip -r9 path/to/zip/worker_function.zip .
   cd path/to/my/helloworld-env/lib64/python2.7/site-packages
   zip -r9 path/to/zip/worker_function.zip .