Spring Cloud Microservices Components

Spring Cloud Microservices Example with Docker, Kubernetes, Kafka on Azure, AWS, GCP

Spring Cloud Microservices Real-Time Architecture with Azure, AWS, GCP using Docker, Kubernetes, Kafka – Integrated with Mainframes, SAP, and Oracle

Author: [Your Name]

Date: June 10, 2025

Introduction

Modern enterprise systems demand scalable, resilient, and cloud-agnostic architectures. Spring Cloud, coupled with Docker and Kubernetes, provides the foundation for building cloud-native microservices. This whitepaper presents a real-time microservices architecture deployed on Azure, AWS, and GCP, leveraging Kafka for communication and integrating with legacy systems like mainframes, SAP, and Oracle ERP.

Architecture Overview

This architecture contains:

  • Spring Boot 3 microservices using Spring Cloud (Eureka, Config, Gateway)
  • Containerized via Docker
  • Orchestrated using Kubernetes on Azure AKS, AWS EKS, and GCP GKE
  • Asynchronous communication via Apache Kafka
  • Secure integration with legacy mainframes, SAP, and Oracle ERP systems

Microservice Components

  • Service Registry: Spring Cloud Eureka for service discovery
  • API Gateway: Spring Cloud Gateway
  • Config Server: Centralized configuration management
  • Kafka Producer/Consumer: Messaging backbone for async processing
  • Business Services: Order Service, Payment Service, Inventory Service

Dockerfile Example


FROM eclipse-temurin:17-jdk-alpine
WORKDIR /app
COPY target/order-service.jar app.jar
ENTRYPOINT ["java", "-jar", "app.jar"]

Kubernetes Deployment Snippet (EKS/GKE/AKS)


apiVersion: apps/v1
kind: Deployment
metadata:
  name: order-service
spec:
  replicas: 3
  selector:
    matchLabels:
      app: order-service
  template:
    metadata:
      labels:
        app: order-service
    spec:
      containers:
      - name: order-service
        image: your-dockerhub/order-service:latest
        ports:
        - containerPort: 8080

Inter-Service Communication

  • Synchronous: REST calls via service discovery using Eureka and Feign clients
  • Asynchronous: Kafka topics for event-driven architecture (e.g., order-events, payment-events)

Kafka Integration Example


spring:
  kafka:
    bootstrap-servers: kafka-service:9092
    consumer:
      group-id: order-group
    producer:
      key-serializer: org.apache.kafka.common.serialization.StringSerializer
      value-serializer: org.apache.kafka.common.serialization.StringSerializer

Cloud Platform Deployment

Azure (AKS)

  • Use Azure Kubernetes Service (AKS)
  • Azure Event Hubs for Kafka-compatible messaging (if desired)
  • Azure AD for securing service endpoints

AWS (EKS)

  • Amazon Elastic Kubernetes Service (EKS)
  • Amazon MSK (Managed Streaming for Kafka)
  • AWS Secrets Manager for managing credentials

GCP (GKE)

  • Google Kubernetes Engine (GKE)
  • Confluent Kafka or GCP Pub/Sub in Kafka-compatible mode
  • Cloud IAM for securing APIs

Integration with Mainframes, SAP & Oracle ERP

Mainframe Integration

  • Use IBM MQ for message-based integration
  • Support JWT token propagation for secure identity mapping
  • Use secure proxy/API gateway for mainframe calls

SAP Integration

  • Use SAP BTP or SAP PI/PO middleware
  • Expose SAP APIs as OData or REST endpoints
  • Integrate using Kafka connectors or SAP adapters

Oracle ERP Integration

  • Oracle Integration Cloud or SOA Suite for orchestrating service calls
  • Use Oracle DB Adapters or REST APIs
  • Kafka Connect with JDBC source/sink for database-level event streaming

Security and Observability

  • Use OAuth2/OIDC via cloud IAM or Keycloak
  • Centralized logging with ELK/EFK stack or cloud-native tools
  • Distributed tracing via OpenTelemetry with Zipkin or Jaeger
  • Service Mesh (Istio/Linkerd) for policy enforcement and mTLS

Benefits of This Architecture

  • Cloud-agnostic and scalable across Azure, AWS, and GCP
  • Supports real-time messaging and event sourcing
  • Secure integration with critical legacy platforms like mainframes, SAP, and Oracle
  • Modular and portable via Docker and Kubernetes

Conclusion

Enterprises looking to modernize with microservices across hybrid environments will benefit from a unified approach combining Spring Cloud, Kubernetes, Kafka, and seamless ERP/mainframe integration. This reference architecture provides a robust foundation for building resilient and secure systems in real-time.

References

``` --- Would you like this saved as an `.html` file or need help auto-publishing to your Blogger account?

Comments

Post a Comment

Popular posts from this blog

About naveen gaayaru

 Naveen Gaayaru was born on 21st January in Hyderabad. Brought up in Secunderabad, Naveen was a mischievous kid. All the qualities and peculiarities that one own may have some hidden connection with his family roots! We all are mere reflections of what or how our older generations were. Even in Naveen’s case, this is the same. Most of his characteristic traits trail down to his family genes; that of the Gayaaru’! Grey hair has been a constant trademark of the Gaayaru since generations. Be it a young man or an older person, all end up having grey hair! But it is not a thing of concern since it tops the trending list nowadays! Lucky enough, none of them had ever reached the state of baldness; things would have been altogether in a different scenario then! The likelihood that a person has or will develop an eyesight problem is inherited. However we can’t ascribe absolutely everything to genetics. Those who spend less time sitting in front of a computer and avoid straining their eyes a...
Read more

About Naveen G

 Naveen Gaayaru was born on 21st January in Ambernagar near Jamai Osmania Railway Station. Brought up in Secunderabad. In Short, I had my schooling in Balaji at Boudhnagar, Intermediate at St.Mary's Centennary College and bachelors and masters in computer science from Osmania university. I am certified in Java Programming, AWS and Azure.I am good at using Canva and office. I have developed Keshalay.shop as part of community service as a freelancer. To get into the details, Naveen lost his father at the age of 10. Even after being a single parent, his mother did not give up. With her positive attitude as his supporting pillar, Naveen started showing interest in studies. He did his primary school in Madhu High School and completed schooling with Distinction at Balaji High School. He got admission into St. Mary’s Centenary Junior College, Where he had good time with Telugu Lecturers talking about what is right and what is wrong. Because of his deep thought process on character dev...
Read more

Boosting Small Businesses in Your Community

Supporting and promoting small businesses in your local area is not just about helping your neighbors; it’s about strengthening your community and encouraging sustainable growth. In this blog, we’ll walk through practical steps to brand, market, and manage small businesses using cost-effective tools and strategies. 1. Branding Small Businesses Near Our Homes Small businesses often struggle with branding, yet this is the cornerstone of their visibility and customer trust. Start by identifying the unique value these businesses bring to the community. Design simple but professional logos, create engaging slogans, and ensure their brand identity aligns with their target audience. Local collaboration can further amplify their presence through mutual promotions and partnerships. 2. Leveraging Free Websites Building a digital presence doesn’t have to be expensive. Platforms like InfinityFree and WordPress offer free hosting options to help businesses get online. Use these tools to create ...
Read more