Example 24: Monolith to Microservices (strangler fig)

[patterncatalyst]

Chapter

_docs/24-appendix-k-monolith-to-microservices.md — Monolith to Microservices

Example Path

examples/24-monolith-to-microservices/

What to demonstrate

• Modular monolith as a destination
• Strangler fig pattern: identify, move, redirect
• Content-based routing for fine-grained cutover
• Decorating collaborator for untouchable legacy

Stack

• Infra: Minikube — Istio + Postgres + LGTM
• Language: Python (FastAPI monolith + extracted services)
• Priority: Medium

Deliverables

• K8s manifests with Istio routing
• Monolith service
• Extracted microservice(s)
• Strangler routing config
• README.md
• verify.sh
• Flip chapter footer to verified