Cracking AWS Network Issues: EC2 Docker to RDS Postgres Connectivity

February 28, 2024 • 5 min read

A step-by-step guide to diagnosing and fixing network connection problems between a Dockerized Spring Boot app on AWS EC2 and an RDS Postgres database. Learn to use nslookup, nc, psql for troubleshooting, and how to configure Docker DNS for private AWS VPC name resolution.