DevOps Platform Case Studies

This repository contains concise technical case studies based on practical DevOps, cloud and platform-engineering work.

Each case study focuses on:

• the original technical state
• the problem or limitation
• the selected architecture or migration approach
• implementation responsibilities
• technical challenges
• validation and resulting improvements

The repository complements the broader JSAPPINF Platform Portfolio.

Case Studies

Kubernetes Routing Migration

ingress-nginx and NLB to Gateway API and AWS ALB

A routing architecture refactoring within an AWS EKS platform, introducing Kubernetes Gateway API, AWS Load Balancer Controller and Application Load Balancer integration.

PostgreSQL → Aurora Migration Series

Two parts of one cross-region lab migration, from environment preparation to new application writes on Aurora.

1. Building the Migration Environment — Source and target, bootstrap, private networking, privileges and DMS placement.
2. DMS Full Load, CDC and Application Cutover — Task failure and troubleshooting, Full Load + CDC, a real application switch, network and database repairs, and validation of new Aurora writes.

EKS / Argo CD Compatibility Upgrade

EKS 1.35 Exposed an Argo CD Compatibility Gap

Upgrading a Terraform-managed Argo CD control plane after an EKS 1.35 compatibility issue, while keeping application workloads unchanged.

Planned Case Studies

• GitLab container-image pipeline evolution
• Helm chart structure and runtime refactoring
• EKS upgrade and support-lifecycle strategy
• Terraform repository consolidation

Sensitive values, account identifiers, resource IDs and credentials are excluded.