Feature/server migration

SERVER_MIGRATION_README.md

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+# Server Migration Solution
+
+**Branch:** `feature/server-migration`  
+**Status:** 🚧 In Development  
+**Focus:** Windows & Linux server migration (not users/workstations)
+
+---
+
+## 🎯 What's Different?
+
+This branch is a **specialized fork** of the Auto Domain Migration solution, focused on **server infrastructure migration** rather than user/workstation migration.
+
+### Main Branch (master)
+- ✅ Active Directory user migration
+- ✅ Workstation domain joins
+- ✅ User profile migration (USMT)
+- ✅ File share migration (user data)
+- ✅ Group Policy migration
+
+### This Branch (feature/server-migration)
+- 🆕 Server discovery & assessment
+- 🆕 Application server migration
+- 🆕 Database migration (SQL, PostgreSQL, MySQL, MongoDB)
+- 🆕 Web server migration (IIS, Apache, Nginx)
+- 🆕 Container migration (VM → Kubernetes)
+- 🆕 Minimal downtime strategies
+
+---
+
+## 📚 Documentation
+
+**Start Here:** [`docs/33_SERVER_MIGRATION_STRATEGY.md`](docs/33_SERVER_MIGRATION_STRATEGY.md)
+
+This document covers:
+- Use cases (data center, cloud, server refresh)
+- Migration methods (Azure Migrate, ASR, DMS)
+- 6-phase workflow
+- Server types (Windows & Linux)
+- Cost estimates
+- Implementation plan (5 weeks)
+
+---
+
+## 🏗️ Architecture
+
+### Supported Migrations
+
+**Windows Servers:**
+- IIS web servers
+- SQL Server databases
+- Custom application servers
+- Print servers
+- Terminal/RDS servers
+
+**Linux Servers:**
+- Apache/Nginx web servers
+- PostgreSQL/MySQL/MongoDB databases
+- Node.js/Python/Java application servers
+- Docker/Podman container hosts
+- NFS/Samba file servers
+
+**Migration Paths:**
+- On-premises → Azure
+- VMware → Azure
+- Physical → Virtual
+- VM → Containers
+- Windows ↔ Linux
+
+---
+
+## 🛠️ Technology Stack
+
+### Migration Tools
+- **Azure Migrate** - Primary orchestration
+- **Azure Site Recovery** - Server replication
+- **Database Migration Service** - Database-specific
+- **Rsync/Robocopy** - File synchronization
+
+### Automation (Reused from main)
+- **Terraform** - Infrastructure provisioning
+- **Ansible** - Configuration management
+- **PowerShell** - Windows automation
+- **Bash** - Linux automation
+
+### Monitoring (Reused from main)
+- **Prometheus** - Metrics
+- **Grafana** - Dashboards
+- **Azure Monitor** - Cloud monitoring
+
+---
+
+## 🚀 Quick Start
+
+### 1. Switch to This Branch
+
+```bash
+git checkout feature/server-migration
+```
+
+### 2. Review Strategy Document
+
+```bash
+# Read the comprehensive strategy
+cat docs/33_SERVER_MIGRATION_STRATEGY.md
+```
+
+### 3. Install Prerequisites
+
+```bash
+# Same as main branch
+- Ansible 2.15+
+- Terraform 1.6+
+- Azure CLI
+- PowerShell 7+
+```
+
+### 4. Start with Discovery
+
+```bash
+# Coming soon: Server discovery playbook
+ansible-playbook playbooks/server_discovery.yml
+```
+
+---
+
+## 📋 Implementation Status
+
+### ✅ Completed
+- [x] Branch created
+- [x] Strategy document
+- [x] Architecture design
+
+### 🚧 In Progress
+- [ ] Remove user/workstation code
+- [ ] Create server discovery playbooks
+- [ ] Azure Migrate integration
+- [ ] Database migration automation
+- [ ] Web server migration playbooks
+
+### 📅 Planned (5-week timeline)
+
+**Week 1: Discovery**
+- [ ] Server inventory automation
+- [ ] Dependency mapping
+- [ ] Assessment reports
+
+**Week 2: Azure Migrate**
+- [ ] Appliance deployment
+- [ ] VMware/Hyper-V integration
+- [ ] Assessment automation
+
+**Week 3-4: Migration**
+- [ ] ASR replication
+- [ ] Database migration (DMS)
+- [ ] Application migration
+- [ ] Testing automation
+
+**Week 5: Cutover**
+- [ ] Pre-cutover checks
+- [ ] Automated failover
+- [ ] DNS updates
+- [ ] Verification
+
+---
+
+## 💡 Key Concepts
+
+### Discovery Phase
+Inventory all servers with:
+- OS type and version
+- CPU, memory, disk
+- Installed applications
+- Running services
+- Network dependencies
+- Database connections
+
+### Replication Phase
+Continuous sync from source to target:
+- Block-level replication (ASR)
+- Application-consistent snapshots
+- Monitor replication lag
+- Alert on issues
+
+### Testing Phase
+Validate before production cutover:
+- Test failover to Azure
+- Verify applications work
+- Performance testing
+- Rollback plan verified
+
+### Cutover Phase
+Minimize downtime with orchestration:
+- Stop source services
+- Final sync
+- Failover to Azure
+- Update DNS
+- Verify all services
+
+---
+
+## 🎯 Use Cases
+
+### 1. Data Center Decommission
+**Scenario:** Moving 50 servers from aging data center to Azure  
+**Timeline:** 8-12 weeks  
+**Downtime:** < 2 hours per server
+
+### 2. VMware to Azure
+**Scenario:** Lift-and-shift VMware VMs to Azure  
+**Timeline:** 4-8 weeks  
+**Downtime:** < 30 minutes per VM
+
+### 3. Server OS Upgrade
+**Scenario:** Windows Server 2012 → 2022  
+**Timeline:** Side-by-side migration  
+**Downtime:** During cutover only
+
+### 4. Database Migration
+**Scenario:** SQL Server 2014 → Azure SQL Managed Instance  
+**Timeline:** 2-4 weeks  
+**Downtime:** < 1 hour (DMS continuous sync)
+
+---
+
+## 💰 Cost Estimates
+
+| Scale | Servers | Monthly Cost | Notes |
+|-------|---------|--------------|-------|
+| **Small** | 5-10 | $200-400 | Dev/Test |
+| **Medium** | 20-50 | $1,000-2,000 | Production |
+| **Large** | 50-100 | $3,000-5,000 | Enterprise |
+| **XL** | 100+ | $5,000-10,000 | Multi-site |
+
+**Migration Costs (temporary):**
+- Azure Migrate: Free (180 days)
+- ASR: ~$25/server/month
+- Data transfer: ~$0.087/GB egress
+- Azure Data Box: $300-500 (large datasets)
+
+---
+
+## 🤝 Relationship to Main Branch
+
+### Shared Components
+We reuse these from the main branch:
+- ✅ Terraform infrastructure patterns
+- ✅ Ansible framework
+- ✅ CI/CD pipelines
+- ✅ Testing framework
+- ✅ Documentation structure
+- ✅ Monitoring stack
+
+### Unique to This Branch
+New components for server migration:
+- 🆕 Azure Migrate integration
+- 🆕 Database migration automation
+- 🆕 Web server migration
+- 🆕 Application discovery
+- 🆕 Dependency mapping
+- 🆕 Cutover orchestration
+
+### Merge Strategy
+- **Keep separate:** Different use cases
+- **Share modules:** Via Git submodules
+- **Cross-reference:** Documentation links
+- **Independent evolution:** Both maintained
+
+---
+
+## 📖 Documentation
+
+| Document | Description |
+|----------|-------------|
+| [33_SERVER_MIGRATION_STRATEGY.md](docs/33_SERVER_MIGRATION_STRATEGY.md) | **START HERE** - Complete strategy |
+| Coming: 34_SERVER_MIGRATION_GUIDE.md | Step-by-step implementation |
+| Coming: 35_DATABASE_MIGRATION.md | Database-specific guide |
+| Coming: 36_WEB_SERVER_MIGRATION.md | Web server patterns |
+| Coming: 37_CONTAINER_MIGRATION.md | VM → Container strategy |
+
+---
+
+## 🔄 Switching Between Branches
+
+### Work on User Migration (main)
+```bash
+git checkout master
+# Work on ADMT, user profiles, workstations
+```
+
+### Work on Server Migration (this branch)
+```bash
+git checkout feature/server-migration
+# Work on Azure Migrate, databases, web servers
+```
+
+### Keep Both Updated
+```bash
+# On feature/server-migration
+git merge master --no-commit
+# Review conflicts, keep shared components updated
+```
+
+---
+
+## 🛣️ Roadmap
+
+### Phase 1: Foundation (Current)
+- [x] Create branch
+- [x] Strategy document
+- [ ] Remove user-specific code
+- [ ] Adapt infrastructure code
+
+### Phase 2: Discovery (Week 1-2)
+- [ ] Server inventory automation
+- [ ] Dependency mapping
+- [ ] Azure Migrate integration
+
+### Phase 3: Migration (Week 3-5)
+- [ ] ASR automation
+- [ ] Database migration
+- [ ] Web server migration
+- [ ] Application patterns
+
+### Phase 4: Polish (Week 6-8)
+- [ ] Complete documentation
+- [ ] Training materials
+- [ ] Test coverage
+- [ ] CI/CD integration
+
+### Phase 5: Production (Week 9+)
+- [ ] Real-world testing
+- [ ] Customer deployments
+- [ ] Feedback integration
+- [ ] Continuous improvement
+
+---
+
+## 🤔 FAQ
+
+### Q: Can I use both solutions?
+**A:** Yes! Main branch for users/workstations, this branch for servers.
+
+### Q: Will this branch merge back to main?
+**A:** No, they're maintained separately. Different use cases.
+
+### Q: What about hybrid scenarios?
+**A:** Use both! Migrate users (main) and servers (this) in parallel.
+
+### Q: Can I contribute to both?
+**A:** Absolutely! Improvements to shared components benefit both.
+
+### Q: Which branch should I use?
+**A:**
+- **main:** Migrating users, workstations, AD objects
+- **feature/server-migration:** Migrating servers, databases, applications
+
+---
+
+## 📞 Support
+
+### Questions?
+- Open an issue on GitHub
+- Tag with `server-migration` label
+- Reference this branch
+
+### Contributing?
+- Fork this branch
+- Submit PR to `feature/server-migration`
+- Follow contribution guidelines
+
+---
+
+## 🎉 Vision
+
+**Build the most comprehensive server migration solution for Azure:**
+- ✅ Automated discovery
+- ✅ Intelligent assessment
+- ✅ Minimal downtime
+- ✅ Zero data loss
+- ✅ Complete automation
+- ✅ Enterprise-grade
+
+**From idea to production in 5 weeks!** 🚀
+
+---
+
+**Current Status:** Branch created, strategy complete, ready to build!
+
+**Next Step:** Remove user-specific code and start building server discovery.
+
+**Version:** 1.0  
+**Last Updated:** January 2025  
+**Branch:** feature/server-migration
+