aws-lambda-migrate/README.md

Lambda Exporter — AWS Lambda Functions Export Utility

This script exports all AWS Lambda functions (code and configuration) from your account to a local directory, for backup, migration, or auditing.

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Requirements

• Python 3.7+
• boto3
• AWS credentials configured (via CLI, environment variables, or IAM role)

Install:

pip install boto3

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Usage

1. Default (uses default AWS profile and region us-east-1)

   exporter = LambdaExporter()
   exporter.export_all_functions()
   

2. Custom profile and region

   exporter = LambdaExporter(profile_name='my-profile', region_name='eu-west-1')
   exporter.export_all_functions(base_dir='backups')
   

3. Run directly
   Save as lambda_exporter.py and run:

   python lambda_exporter.py
   

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Output Structure

lambda_export/
└── export_YYYYMMDD_HHMMSS/
    ├── FunctionName1/
    │   ├── configuration.json
    │   └── [extracted source files...]
    ├── FunctionName2/
    │   ├── configuration.json
    │   └── function_code.bin   # if not a ZIP
    └── export_summary.json

• ZIP-based functions are fully extracted.
• configuration.json contains runtime, memory, timeout, env vars, role, etc.
• export_summary.json logs total functions and success count.

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Required IAM Permissions

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

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Important Notes

• The script is read-only — it does not modify any AWS resources.
• Environment variables (including secrets) are included in configuration.json. Handle exports securely and avoid committing them to version control.
• Pre-signed download URLs are used immediately, so expiration is not an issue for typical function sizes.

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