the_order/docs/architecture/CLOUD_FOR_SOVEREIGNTY_LANDING_ZONE.md

# Cloud for Sovereignty Landing Zone Architecture

**Last Updated**: 2025-01-27  
**Management Group**: SOVEREIGN-ORDER-OF-HOSPITALLERS  
**Framework**: Azure Well-Architected Framework + Cloud for Sovereignty  
**Status**: Planning Phase

## Executive Summary

This document outlines a comprehensive Cloud for Sovereignty landing zone architecture for The Order, designed using Azure Well-Architected Framework principles. The architecture spans all non-US Azure commercial regions to ensure data sovereignty, compliance, and operational resilience.

## Management Group Hierarchy

```
SOVEREIGN-ORDER-OF-HOSPITALLERS (Root)
├── Landing Zones
│   ├── Platform (Platform team managed)
│   ├── Sandbox (Development/testing)
│   └── Workloads (Application workloads)
├── Management
│   ├── Identity (Identity and access management)
│   ├── Security (Security operations)
│   └── Monitoring (Centralized monitoring)
└── Connectivity
    ├── Hub Networks (Regional hubs)
    └── Spoke Networks (Workload networks)
```

## Well-Architected Framework Pillars

### 1. Cost Optimization

**Principles:**
- Right-sizing resources per region
- Reserved instances for predictable workloads
- Spot instances for non-critical workloads
- Cost allocation tags for chargeback
- Budget alerts and governance

**Implementation:**
- Cost Management budgets per management group
- Azure Advisor recommendations
- Resource tagging strategy
- Reserved capacity planning

### 2. Operational Excellence

**Principles:**
- Infrastructure as Code (Terraform)
- Automated deployments (GitHub Actions)
- Centralized logging and monitoring
- Runbooks and playbooks
- Change management processes

**Implementation:**
- Terraform modules for repeatable deployments
- CI/CD pipelines for infrastructure
- Azure Monitor and Log Analytics
- Azure Automation for runbooks

### 3. Performance Efficiency

**Principles:**
- Regional proximity for low latency
- CDN for global content delivery
- Auto-scaling for dynamic workloads
- Performance monitoring and optimization
- Database query optimization

**Implementation:**
- Multi-region deployment
- Azure Front Door for global routing
- Azure CDN for static assets
- Application Insights for performance tracking

### 4. Reliability

**Principles:**
- Multi-region redundancy
- Availability Zones within regions
- Automated failover
- Disaster recovery procedures
- Health monitoring and alerting

**Implementation:**
- Primary and secondary regions
- Geo-replication for storage
- Traffic Manager for DNS failover
- RTO: 4 hours, RPO: 1 hour

### 5. Security

**Principles:**
- Zero-trust architecture
- Defense in depth
- Data encryption at rest and in transit
- Identity and access management
- Security monitoring and threat detection

**Implementation:**
- Azure AD for identity
- Key Vault for secrets management
- Network Security Groups and Azure Firewall
- Microsoft Defender for Cloud
- Azure Sentinel for SIEM

## Cloud for Sovereignty Requirements

### Data Residency

- **Requirement**: All data must remain within specified regions
- **Implementation**: 
  - Resource location policies
  - Storage account geo-replication controls
  - Database replication restrictions

### Data Protection

- **Requirement**: Encryption and access controls
- **Implementation**:
  - Customer-managed keys (CMK)
  - Azure Key Vault with HSM
  - Private endpoints for services

### Compliance

- **Requirement**: GDPR, eIDAS, and regional compliance
- **Implementation**:
  - Compliance policies and initiatives
  - Audit logging and retention
  - Data classification and labeling

### Operational Control

- **Requirement**: Sovereign operations and control
- **Implementation**:
  - Management group hierarchy
  - Policy-based governance
  - Role-based access control (RBAC)

## Regional Architecture

### Supported Regions (Non-US Commercial)

1. **West Europe** (Netherlands) - Primary
2. **North Europe** (Ireland) - Secondary
3. **UK South** (London) - UK workloads
4. **Switzerland North** (Zurich) - Swiss workloads
5. **Norway East** (Oslo) - Nordic workloads
6. **France Central** (Paris) - French workloads
7. **Germany West Central** (Frankfurt) - German workloads

### Regional Deployment Pattern

Each region follows the same pattern:

```
Region
├── Hub Network (VNet)
│   ├── Gateway Subnet (VPN/ExpressRoute)
│   ├── Azure Firewall Subnet
│   └── Management Subnet
├── Spoke Networks (Workloads)
│   ├── Application Subnet
│   ├── Database Subnet
│   └── Storage Subnet
├── Key Vault (Regional)
├── Storage Account (Regional)
├── Database (Regional)
└── AKS Cluster (Regional)
```

## Landing Zone Components

### 1. Identity and Access Management

- **Azure AD Tenant**: Single tenant per sovereignty requirement
- **Management Groups**: Hierarchical organization
- **RBAC**: Role-based access control
- **Conditional Access**: Location-based policies
- **Privileged Identity Management**: Just-in-time access

### 2. Network Architecture

- **Hub-and-Spoke**: Centralized connectivity
- **Azure Firewall**: Centralized security
- **Private Endpoints**: Secure service access
- **VPN/ExpressRoute**: Hybrid connectivity
- **Network Watcher**: Monitoring and diagnostics

### 3. Security and Compliance

- **Microsoft Defender for Cloud**: Security posture management
- **Azure Sentinel**: SIEM and SOAR
- **Key Vault**: Secrets and certificate management
- **Azure Policy**: Governance and compliance
- **Azure Blueprints**: Standardized deployments

### 4. Monitoring and Logging

- **Log Analytics Workspaces**: Regional workspaces
- **Application Insights**: Application monitoring
- **Azure Monitor**: Infrastructure monitoring
- **Azure Service Health**: Service status
- **Azure Advisor**: Best practice recommendations

### 5. Backup and Disaster Recovery

- **Azure Backup**: Centralized backup
- **Azure Site Recovery**: DR orchestration
- **Geo-replication**: Cross-region replication
- **Backup Vault**: Regional backup storage

### 6. Governance

- **Azure Policy**: Resource compliance
- **Azure Blueprints**: Standardized environments
- **Cost Management**: Budget and cost tracking
- **Resource Tags**: Organization and chargeback
- **Management Groups**: Hierarchical governance

## Resource Organization

### Naming Convention

```
{provider}-{region}-{resource}-{env}-{purpose}

Examples:
- az-we-rg-dev-main (Resource Group)
- azwesadevdata (Storage Account)
- az-we-kv-dev-main (Key Vault)
- az-we-aks-dev-main (AKS Cluster)
```

### Tagging Strategy

Required tags for all resources:
- `Environment`: dev, stage, prod
- `Project`: the-order
- `Region`: westeurope, northeurope, etc.
- `ManagedBy`: terraform
- `CostCenter`: engineering
- `Owner`: platform-team
- `DataClassification`: public, internal, confidential, restricted
- `Compliance`: gdpr, eidas, regional

## Deployment Strategy

### Phase 1: Foundation (Weeks 1-2)
- Management group hierarchy
- Identity and access management
- Core networking (hub networks)
- Key Vault setup
- Log Analytics workspaces

### Phase 2: Regional Deployment (Weeks 3-6)
- Deploy to primary region (West Europe)
- Deploy to secondary region (North Europe)
- Set up geo-replication
- Configure monitoring

### Phase 3: Multi-Region Expansion (Weeks 7-10)
- Deploy to remaining regions
- Configure regional failover
- Set up CDN endpoints
- Implement traffic routing

### Phase 4: Workload Migration (Weeks 11-14)
- Migrate applications
- Configure application networking
- Set up application monitoring
- Performance optimization

### Phase 5: Optimization (Weeks 15-16)
- Cost optimization
- Performance tuning
- Security hardening
- Documentation and runbooks

## Cost Estimation

### Per Region (Monthly)

- **Networking**: $500-1,000
- **Compute (AKS)**: $1,000-3,000
- **Storage**: $200-500
- **Database**: $500-2,000
- **Monitoring**: $200-500
- **Security**: $300-800
- **Backup**: $100-300

**Total per region**: $2,800-8,100/month

### Multi-Region (7 regions)
- **Development**: ~$20,000/month
- **Production**: ~$50,000/month

## Security Considerations

### Data Sovereignty
- All data stored within specified regions
- No cross-region data transfer without encryption
- Customer-managed keys for encryption
- Private endpoints for all services

### Access Control
- Zero-trust network architecture
- Conditional access policies
- Multi-factor authentication
- Just-in-time access
- Privileged access management

### Compliance
- GDPR compliance
- eIDAS compliance
- Regional data protection laws
- Audit logging (90 days retention)
- Data classification and handling

## Monitoring and Alerting

### Key Metrics
- Resource health
- Cost trends
- Security alerts
- Performance metrics
- Compliance status

### Alert Channels
- Email notifications
- Azure Monitor alerts
- Microsoft Teams integration
- PagerDuty (for critical alerts)

## Disaster Recovery

### RTO/RPO Targets
- **RTO**: 4 hours
- **RPO**: 1 hour

### DR Strategy
- Primary region: West Europe
- Secondary region: North Europe
- Backup regions: Other regional hubs
- Automated failover for critical services
- Manual failover for non-critical services

## Next Steps

1. **Review and Approve Architecture**
2. **Set Up Management Group Hierarchy**
3. **Deploy Foundation Infrastructure**
4. **Configure Regional Networks**
5. **Deploy Regional Resources**
6. **Set Up Monitoring and Alerting**
7. **Implement Security Controls**
8. **Migrate Workloads**
9. **Optimize and Tune**

---

**Last Updated**: 2025-01-27  
**Next Review**: After Phase 1 completion