Connecting .NET Lambda to Amazon Aurora PostgreSQL via RDS Proxy

This article demonstrates how to connect .NET Lambda functions to Aurora PostgreSQL using RDS Proxy for connection pooling and AWS Secrets Manager for credential management.

• RDS Proxy handles serverless scaling patterns and reduces database connection overhead
• AWS Secrets Manager stores and manages database credentials securely
• CloudFormation template provisions VPC, Aurora PostgreSQL, RDS Proxy, and supporting resources
• Uses Npgsql open-source .NET data provider for PostgreSQL connectivity
• Implements AWS Secrets Manager client-side caching to improve performance and reduce latency
• Step-by-step deployment using .NET Lambda CLI tools on Windows EC2 instance
• Lambda function configured with VPC subnets and security groups for database access
• Includes testing procedures using AWS CLI and CloudWatch logs for verification

This architecture simplifies SQL Server to PostgreSQL migrations by abstracting connection complexity while providing improved performance, reliability, and cost-efficiency for serverless applications.