# Cloud for Sovereignty Landing Zone - Multi-Region Architecture

## Overview

This document outlines the Well-Architected Framework implementation for a Cloud for Sovereignty landing zone across all Azure commercial Non-US regions.

## Architecture Principles

1. **Data Sovereignty**: Data remains within specified regions
2. **Compliance**: Meets regional regulatory requirements
3. **Resilience**: Multi-region deployment for high availability
4. **Scalability**: Supports growth across regions
5. **Cost Optimization**: Efficient resource utilization

## Management Group Structure

```
Root Management Group
└── Landing Zones (Landing Zones)
    ├── Platform (Platform)
    │   ├── Management (Management)
    │   ├── Connectivity (Connectivity)
    │   └── Identity (Identity)
    └── Workloads (Workloads)
        ├── Production (Production)
        ├── Non-Production (Non-Production)
        └── Sandbox (Sandbox)
```

## Non-US Commercial Regions

### Europe
- Belgium Central (belgiumcentral)
- France Central (francecentral)
- France South (francesouth)
- Germany North (germanynorth)
- Germany West Central (germanywestcentral)
- Italy North (italynorth)
- Netherlands (northeurope)
- Norway East (norwayeast)
- Norway West (norwaywest)
- Poland Central (polandcentral)
- Spain Central (spaincentral)
- Sweden Central (swedencentral)
- Switzerland North (switzerlandnorth)
- Switzerland West (switzerlandwest)
- UK South (uksouth)
- UK West (ukwest)
- West Europe (westeurope)

### Asia Pacific
- Australia East (australiaeast)
- Australia Southeast (australiasoutheast)
- China East (chinaeast)
- China North (chinanorth)
- East Asia (eastasia)
- India Central (centralindia)
- India South (southindia)
- India West (westindia)
- Indonesia Central (indonesiacentral)
- Japan East (japaneast)
- Japan West (japanwest)
- Korea Central (koreacentral)
- Korea South (koreasouth)
- Malaysia West (malaysiawest)
- New Zealand North (newzealandnorth)
- Southeast Asia (southeastasia)

### Middle East & Africa
- Israel Central (israelcentral)
- Qatar Central (qatarcentral)
- South Africa North (southafricanorth)
- South Africa West (southafricawest)
- UAE Central (uaecentral)
- UAE North (uaenorth)

### Americas (Non-US)
- Brazil South (brazilsouth)
- Brazil Southeast (brazilsoutheast)
- Canada Central (canadacentral)
- Canada East (canadaeast)
- Chile Central (chilecentral)
- Mexico Central (mexicocentral)

## Resource Organization

### Per-Region Structure
Each region follows the Well-Architected Framework structure:

```
{cloud}-{env}-{region}-rg-{type}-{instance}
```

Example: `az-p-we-rg-comp-001` (Azure, Production, West Europe, Resource Group, Compute, Instance 001)

### Resource Group Types
- **Network** (`rg-net-001`): Virtual networks, subnets, NSGs, Application Gateways
- **Compute** (`rg-comp-001`): AKS clusters, VMs, Container Instances
- **Storage** (`rg-stor-001`): Storage accounts, backups
- **Security** (`rg-sec-001`): Key Vaults, Security Centers
- **Monitoring** (`rg-mon-001`): Log Analytics, Application Insights
- **Identity** (`rg-id-001`): Managed identities, Azure AD resources
- **Terraform State** (`rg-tfstate-001`): State storage

## Deployment Strategy

### Phase 1: Foundation
1. Management Group hierarchy
2. Subscription organization
3. Policy definitions and assignments
4. Role-based access control (RBAC)

### Phase 2: Core Infrastructure (Per Region)
1. Resource Groups (all types)
2. Virtual Networks and connectivity
3. Key Vaults
4. Log Analytics Workspaces
5. Storage accounts

### Phase 3: Compute Resources (Per Region)
1. AKS clusters
2. Node pools (validators, sentries, RPC)
3. Container registries

### Phase 4: Application Deployment
1. Besu network components
2. Monitoring stack
3. Application gateways
4. Load balancers

## Compliance & Sovereignty

### Data Residency
- All data stored within specified region
- No cross-region data replication (unless explicitly configured)
- Regional compliance certifications

### Security
- Regional Key Vaults
- Regional identity providers
- Network isolation per region
- Regional monitoring and logging

## Cost Management

### Tagging Strategy
- Environment: prod, dev, test, staging
- Region: region code
- CostCenter: Blockchain
- Project: DeFi Oracle Meta Mainnet
- ManagedBy: Terraform

### Budgets
- Per-region budgets
- Per-environment budgets
- Alert thresholds

## Monitoring & Governance

### Centralized Monitoring
- Log Analytics Workspaces per region
- Centralized dashboard
- Cross-region metrics aggregation

### Policy Enforcement
- Naming conventions
- Resource location restrictions
- Tag requirements
- SKU restrictions

## Next Steps

1. Create management group structure
2. Create subscription structure
3. Deploy foundation resources
4. Deploy per-region infrastructure
5. Deploy application components
6. Configure monitoring and governance
