Migrating from a monolithic architecture to microservices is a complex but rewarding process. The Strangler Fig pattern is commonly used, where you incrementally replace parts of the monolith with microservices. However, starting with a Modular Monolith makes the transition smoother.
Key Characteristics of Good Microservice Candidates:
- Low coupling with other modules
- High cohesion within the module
- Distinct business function
- Performance/scalability benefits from separation
Migration Process:
1. Identify modules suitable for extraction.
2. Extract the module and refactor dependencies.
3. Fix communication (APIs, event-driven messaging).
4. Migrate data (database per service or shared).
5. Deploy independently with CI/CD pipelines.
For a detailed guide, check: Microservices Migration Process
You Should Know:
Essential Commands & Tools for Microservices Migration
1. Containerization & Orchestration
Dockerize a module docker build -t my-module-service . docker run -d -p 8080:80 my-module-service Kubernetes deployment kubectl apply -f deployment.yaml kubectl expose deployment my-module --type=LoadBalancer --port=80
2. API Gateways & Service Discovery
Using Nginx as an API Gateway
server {
listen 80;
location /module1 {
proxy_pass http://module1-service:8000;
}
}
Consul for service discovery
consul agent -dev
3. Database Migration
PostgreSQL dump & restore pg_dump -U user -h localhost monolith_db > monolith_backup.sql psql -U user -h new_host microservice_db < monolith_backup.sql
4. Event-Driven Communication (Kafka)
Start Kafka bin/zookeeper-server-start.sh config/zookeeper.properties bin/kafka-server-start.sh config/server.properties Create a topic bin/kafka-topics.sh --create --topic module-events --bootstrap-server localhost:9092
5. Monitoring & Logging
Prometheus metrics endpoint curl http://localhost:9090/metrics ELK Stack for logs filebeat setup --pipelines --modules nginx,system
What Undercode Say:
Migrating to microservices is not just a technical shift but also an organizational change. Teams must embrace DevOps practices, observability, and domain-driven design. While microservices offer scalability, they introduce complexity in distributed transactions, network latency, and debugging.
Key Takeaways:
✔ Start with a Modular Monolith before full microservices.
✔ Use Docker & Kubernetes for seamless deployments.
✔ Monitor aggressively (Prometheus, Grafana, ELK).
✔ Adopt event-driven architectures (Kafka, RabbitMQ).
✔ Ensure database independence (CQRS, Saga Pattern).
Expected Output:
A well-structured migration plan with automated deployments, observability, and clear service boundaries.
Would you like additional details on specific migration tools or failure recovery strategies? Let me know! 🚀
References:
Reported By: Milan Jovanovic – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
