Monitoring network traffic in AWS Lambda functions

This article explores various methods for monitoring network traffic in AWS Lambda functions, addressing the need for visibility, security, and compliance in serverless environments.

• VPC Flow Logs: Captures network traffic data at the ENI level, providing insights into IP addresses, ports, and protocols
• Proxy-based monitoring: Routes network traffic through a side-car proxy layer to log network activity
• Procfs technique: Reads network statistics from Linux OS pseudo-filesystem without adding latency
• Libc call interception: Intercepts low-level network operations to capture detailed connection information like DNS lookups and IP addresses

The article emphasizes the importance of choosing the right monitoring approach based on organizational requirements, runtime compatibility, and implementation complexity. Each method offers unique advantages for tracking network traffic in Lambda functions.