Step-by-step guide for executing Azure Rehost migration strategy
🎯 Overview
This guide provides detailed implementation steps for the Rehost (Lift & Shift) migration strategy, enabling rapid migration to Azure with minimal changes to existing applications.
📋 Implementation Phases
📊 Phase Overview
flowchart LR
A[📋 Prepare] --> B[🔍 Assess]
B --> C[🛠️ Migrate]
C --> D[✅ Validate]
D --> E[📈 Optimize]
A --> A1[Environment Setup]
A --> A2[Tool Configuration]
B --> B1[Application Discovery]
B --> B2[Dependency Mapping]
C --> C1[Infrastructure Migration]
C --> C2[Application Migration]
C --> C3[Data Migration]
D --> D1[Functional Testing]
D --> D2[Performance Testing]
E --> E1[Cost Optimization]
E --> E2[Performance Tuning]
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🛠️ Phase 1: Preparation
🏗️ Environment Setup
Azure Landing Zone Configuration
# Create Resource Group
az group create --name rg-migration-prod --location eastus
# Create Virtual Network
az network vnet create \--resource-group rg-migration-prod \--name vnet-migration \--address-prefix 10.0.0.0/16 \--subnet-name subnet-web \--subnet-prefix 10.0.1.0/24
# Create Network Security Group
az network nsg create \--resource-group rg-migration-prod \--name nsg-web-tier
🖥️ Virtual Machines: Inventory all VMs and their configurations
🗄️ Databases: Catalog database instances and versions
💾 Storage: Map storage systems and capacity
🌐 Networking: Document network topology and dependencies
🔗 Applications: Identify application tiers and connections
🔄 Dependency Mapping
graph TD
A[Web Tier] --> B[App Tier]
B --> C[Database Tier]
B --> D[File Storage]
A --> E[Load Balancer]
C --> F[Backup System]
A1[IIS Web Server] --> A
B1[.NET Application] --> B
C1[SQL Server] --> C
D1[File Share] --> D
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-- Pre-migration checklistSELECTname,compatibility_level,collation_name,state_descFROMsys.databasesWHEREdatabase_id>4;-- Check for unsupported featuresSELECTfeature_name,feature_idFROMsys.dm_db_persisted_sku_features;
Migration Approaches
Method
Downtime
Use Case
🔄 Backup/Restore
Hours
Small databases
📡 Replication
Minutes
Large databases
🚛 DMS
Minimal
Online migration
💾 Import/Export
Hours
Data migration only
💾 Storage Migration
Azure Storage Types
flowchart TD
A[Storage Requirements] --> B{Performance Needs}
B -->|High IOPS| C[Premium SSD]
B -->|Balanced| D[Standard SSD]
B -->|Archive| E[Cool/Archive Blob]
C --> C1[P30: 5000 IOPS]
C --> C2[P40: 7500 IOPS]
C --> C3[P50: 7500 IOPS]
D --> D1[E30: 500 IOPS]
D --> D2[E40: 500 IOPS]
E --> E1[Cool: Infrequent access]
E --> E2[Archive: Long-term retention]
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✅ Phase 4: Validation & Testing
🧪 Testing Framework
Test Categories
Test Type
Scope
Success Criteria
🔧 Functional
Application features
100% feature parity
⚡ Performance
Response times
<20% degradation
🛡️ Security
Access controls
All controls functional
🔄 Integration
System connections
All integrations working
Performance Validation
# CPU and Memory monitoring
az vm show \--resource-group rg-migration-prod \--name vm-web-01 \--show-details# Application performance testing
curl -w"@curl-format.txt"-o /dev/null -s"https://app.contoso.com/health"
📊 Post-Migration Checklist
🔍 Application Functionality: All features working correctly
📈 Performance Baselines: Metrics within acceptable range
🛡️ Security Controls: All security measures active
# Test connectivity
Test-NetConnection -ComputerName vm-web-01.eastus.cloudapp.azure.com -Port 443
# Check NSG rules
az network nsg rule list --resource-group rg-migration-prod --nsg-name nsg-web-tier
Performance Issues
# Check VM metrics
az monitor metrics list \--resource /subscriptions/{sub-id}/resourceGroups/rg-migration-prod/providers/Microsoft.Compute/virtualMachines/vm-web-01 \--metric"Percentage CPU"
📚 Success Criteria
✅ Migration Completion Criteria
🎯 Functional Parity: 100% of application features working