NAVTTC Pakistan – Legacy to Modern Microservices Migration of National LMS on Cloud

The NAVTTC Learning Management System was originally built on a legacy Spring Boot architecture that was difficult to scale, maintain, and deploy efficiently. It required modernization into a containerized microservices-based system with improved performance, secure deployment pipelines, live class support, and zero-downtime updates while ensuring strict data integrity during migration.

Objective

To migrate a large-scale legacy LMS (Spring Boot) into a modern microservices-based MERN architecture deployed on OVH Cloud, with secure CI/CD pipelines, automated backups, real-time learning features, and guaranteed data integrity for 1.5 TB of data.

Architecture Overview

The system was redesigned as a microservices-based LMS deployed on OVH Cloud using Docker with isolated networking. Traefik handled reverse proxy routing with SSL/TLS encryption. GitHub Actions integrated with a private Docker registry enabled automated CI/CD with blue/green deployment strategy. MongoDB Replica Set ensured data reliability, while Redis improved performance. S3 was used for backups, and Bash-based automation scripts handled scheduled database backups. BigBlueButton was integrated for live classes and real-time learning sessions.

Tools & Technologies Used

OVH Cloud, Docker, Docker Registry, Traefik, MongoDB Replica Set, Redis, S3, GitHub Actions, Jenkins, BigBlueButton, Bash Scripting, MERN Stack

Implementation Steps

• Migrated legacy Spring Boot LMS to a modern microservices-based MERN architecture.
• Containerized all services using Docker with isolated network design.
• Configured Traefik for SSL-enabled routing and load balancing.
• Implemented GitHub Actions CI/CD with private registry for automated deployments.
• Designed blue/green deployment strategy for zero-downtime releases.
• Set up MongoDB Replica Set for high availability and consistency.
• Built automated database backup system using Bash scripts to S3 storage.
• Implemented SPA routing, JWT authentication, and CORS security.
• Integrated BigBlueButton for live virtual classrooms.
• Ensure Databases backup via scripting on cloud.
• Enabled zero-downtime redeployments for continuous updates via Github Actions.

Challenges Faced

• Migrating large-scale legacy system without downtime.
• Ensuring data integrity during massive migration.
• Handling high-volume user data and live session traffic.
• Managing compatibility between old Spring Boot structure and new microservices.
• Implementing secure backup and recovery strategy.

Troubleshooting & Solutions

Developed a staged migration strategy to ensure zero data loss during transition. Implemented checksum-based validation to guarantee data integrity. Automated backup verification using Bash scripts before and after migration. Fixed routing and authentication issues during system transition. Optimized MongoDB replica synchronization to ensure consistency across nodes.

Key Learnings

This project strengthened expertise in large-scale system migration, data integrity assurance, DevOps automation, secure CI/CD pipelines, and enterprise-grade LMS architecture design.

Live Project Screenshots