Lambda Runtime Updater

Automate updating Lambda runtimes at scale with safety features.

Setup

pip install -r requirements.txt

Ensure AWS credentials are configured:

aws configure
# or use environment variables: AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY

Usage

Dry Run (Preview Changes)

python update_lambda_runtimes.py \
  --old-runtime python3.8 \
  --new-runtime python3.11 \
  --dry-run

Update Functions

python update_lambda_runtimes.py \
  --old-runtime python3.8 \
  --new-runtime python3.11 \
  --region us-east-1

Advanced Options

python update_lambda_runtimes.py \
  --old-runtime python3.8 \
  --new-runtime python3.11 \
  --region us-west-2 \
  --batch-size 20 \
  --delay 1.0

Parameters

• --old-runtime: Current runtime to find (required)
• --new-runtime: Target runtime to update to (required)
• --region: AWS region (default: us-east-1)
• --dry-run: Preview without making changes
• --batch-size: Concurrent updates (default: 10)
• --delay: Delay between updates in seconds (default: 0.5)

Supported Runtimes

• Python: python3.8, python3.9, python3.10, python3.11, python3.12
• Node.js: nodejs16.x, nodejs18.x, nodejs20.x
• Java: java11, java17, java21
• .NET: dotnet6, dotnet8
• Ruby: ruby3.2, ruby3.3
• Go: provided.al2, provided.al2023

IAM Permissions Required

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "lambda:ListFunctions",
        "lambda:UpdateFunctionConfiguration"
      ],
      "Resource": "*"
    }
  ]
}

Best Practices

1. Always run with --dry-run first
2. Test on non-production environments first
3. Update in batches during low-traffic periods
4. Monitor CloudWatch Logs after updates
5. Have a rollback plan ready