author: 51n5337 & #CLD
mission: CompTIA Cloud+ Certification
brief: migrate-strategy. examples.

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🎮 Real-World MMORPG Migration: “Dragon’s Legacy”

Background: 15-year-old game, 200K active players, aging hardware, wants modern features.

The Mixed Strategy:

🗄️ CHARACTER DATABASE:
- **Replatform** + **Refactor**
- Move from MySQL → Amazon Aurora (replatform)
- Break monolithic DB into microservices: characters, inventory, social (refactor)

🎯 GAME SERVERS:
- **Relocate** + **Replatform** 
- VMware VMs → AWS EC2 (relocate)
- Add auto-scaling + load balancers (replatform)

💬 CHAT SYSTEM:
- **Repurchase** + **Retire**
- Custom chat → Discord integration (repurchase)
- Retire old chat servers (retire)

📊 ANALYTICS:
- **Refactor** completely
- Batch processing → real-time Kinesis streams
- Custom dashboards → QuickSight

🛠️ DEV TOOLS:
- **Retain** (for now)
- Legacy build servers stay on-prem
- "We'll deal with this next year"

📈 PLAYER BEHAVIOR:
- **Rehost** + **Replatform**
- Move log files to S3 (rehost)
- Process with Athena/Lambda (replatform)

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🏢 Enterprise E-commerce: “MegaMart”

Background: Traditional retailer going digital, legacy systems, seasonal traffic spikes.

The Hybrid Approach:

🛒 SHOPPING CART:
- **Refactor** to microservices
- Monolith → AWS ECS containers
- **Result:** Scales independently during holiday rushes

💳 PAYMENT PROCESSING:
- **Repurchase** (Stripe API)
- **Retire** custom payment system
- **Result:** PCI compliance handled, faster checkout

📦 INVENTORY SYSTEM:
- **Rehost** (for now)
- Move AS/400 system to EC2
- **Result:** Buys time for full modernization

📊 CUSTOMER DATA:
- **Replatform** + **Refactor**
- Oracle DB → Amazon RDS (replatform)
- Add personalization microservices (refactor)

🎯 MARKETING SITE:
- **Replatform** on WordPress + RDS
- **Result:** Managed updates, better performance

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🏥 Healthcare Provider: “MediCore Systems”

Background: HIPAA compliance, legacy patient records, need mobile access.

Compliance-First Mix:

📋 PATIENT RECORDS:
- **Replatform** to Azure SQL Database
- **Retain** sensitive data on-prem via hybrid connection
- **Result:** Compliant but modernized

📱 PATIENT PORTAL:
- **Refactor** as Azure Functions + Cosmos DB
- **Result:** Scalable, cost-effective for variable usage

💊 PHARMACY SYSTEM:
- **Rehost** on Azure VMs
- **Result:** Quick win, no compliance re-certification

📞 APPOINTMENT SCHEDULING:
- **Repurchase** (SaaS scheduling platform)
- **Result:** Faster implementation, less custom code

📊 ANALYTICS:
- **Refactor** to Azure Data Lake + Power BI
- **Result:** Better insights, maintained compliance

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💡 The Pattern: Risk-Managed Transformation

Smart migrations use mixed strategies to:

• 🎯 Manage risk (don’t bet everything on one approach)
• ⚡ Deliver value fast (quick wins build momentum)
• 🏗️ Lay foundations (some services enable future innovation)
• 💸 Control costs (balance investment vs. return)

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