Network Programming in .NET

If, like me, you have an old Lambda function running Python 3.8, you may have got this email from AWS today;

We are contacting you as we have identified that your AWS Account currently has one or more AWS Lambda functions using the Python 3.8 runtime.

We are ending support for Python 3.8 in Lambda on October 14, 2024. This follows Python 3.8 End-Of-Life (EOL) which is scheduled for October, 2024 [1].

As described in the Lambda runtime support policy [2], end of support for language runtimes in Lambda happens in several stages. Starting on October 14, 2024, Lambda will no longer apply security patches and other updates to the Python 3.8 runtime used by Lambda functions, and functions using Python 3.8 will no longer be eligible for technical support. Also, Python 3.8 will no longer be available in the AWS Console, although you can still create and update functions that use Python 3.8 via AWS CloudFormation, the AWS CLI, AWS SAM, or other tools. Starting February 28, 2025, you will no longer be able to create new Lambda functions using the Python 3.8 runtime. Starting March 31, 2025, you will no longer be able to update existing functions using the Python 3.8 runtime.

So, the first thing, is to find which lambda functions are affected, and this, I wrote a Windows Batch script as follows;

@echo off

set regions=us-east-1 us-east-2 us-west-1 us-west-2 ap-south-1 ap-northeast-1 ap-northeast-2 ap-southeast-1 ap-southeast-2 ca-central-1 eu-central-1 eu-west-1 eu-west-2 eu-west-3 sa-east-1

for %%r in (%regions%) do (
    echo Listing Lambda functions in %%r region:
    aws lambda list-functions --region %%r --output text --query "Functions[?Runtime=='python3.8'].FunctionArn"
    echo -----------------------------------------
)

Then, once I listed all the functions, it’s a matter of going to each one in the AWS Lambda console, scrolling down on the “Code” tab, to change the runtime;

To change the runtime

1. Open the Functions page of the Lambda console.
2. Choose the function to update and choose the Code tab.
3. Scroll down to the Runtime settings section, which is under the code editor.
4. Choose Edit.
   1. For Runtime, select the runtime identifier.
   2. For Handler, specify file name and handler for your function.
   3. For Architecture, choose the instruction set architecture to use for your function.
5. Choose Save.