creating aws lambda layers for python with third party libraries

creating_aws_lambda_layers_with_python_and_third_party_libraries.md

creating aws lambda layers for python and third party libraries

python versions

• Python 3.9: use Fedora 34
• Python 3.10: use Fedora 35

example

# 'python' will be the top-level folder and underneath it, modules will be installed
pip install -t python paramiko
zip -9r paramiko-py39.zip python

lambda usage

import sys
# sys.path.append("/opt/third_party")

try:
    import paramiko
except ModuleNotFoundError as err:
    print(f"{err}")
    sys.exit()

client = paramiko.SSHClient()

cloudformation

• /opt/python is in the sys.path
• the paramiko-py39.zip mentioned above, will be unzipped into /opt/python

lambda_ip_addresses_and_gateways.py

import sys
# sys.path.append("/opt/third_party")

try:
    import netifaces
except ModuleNotFoundError as err:
    print(f"{err}")
    sys.exit()
    

def lambda_handler(event, context):
    real_interfaces = [x for x in netifaces.interfaces() if x != "lo"]
    print(f"{real_interfaces=}")
    for i in real_interfaces:
        for j in netifaces.ifaddresses(i):
            print(i, netifaces.ifaddresses(i)[j])
            
    print()
    print(f"{netifaces.gateways()=}")

    return {'statusCode': 200, 'body': "ok 1"}