Article 04: Running Multiple Microservices Locally

1. Objective

Learn how to run and manage multiple microservices on your local machine.

2. Key Concepts

• Port management
• Environment-based configuration
• Service isolation

3. Problem Statement

When you have multiple microservices:

• Port conflicts occur
• Configurations differ per service

4. Hands-On: Add Order Service

Create another Spring Boot app:

• Name: order-service
• Port: 8082

application.yml:

server:
  port: 8082
spring:
  application:
    name: order-service

5. Running Services

Run:

• user-service on 8081
• order-service on 8082

Verify:

• http://localhost:8081/users/1
• http://localhost:8082/orders/1

6. Testing with Postman

• Create requests for each service
• Validate independent behavior

7. Environment Profiles

spring:
  profiles:
    active: dev

8. Common Mistakes

• Using same port
• Sharing database
• Tight coupling between services

9. Interview Notes

• Local setup mimics real microservice environments
• Profiles help manage configs cleanly

10. Summary

You can now run multiple microservices independently on your system.

11. What’s Next

Enable communication between microservices.