multi-cloud-architecture

# Multi-Cloud Architecture

Decision framework and patterns for architecting applications across AWS, Azure, and GCP.

## Purpose

Design cloud-agnostic architectures and make informed decisions about service selection across cloud providers.

## When to Use

- Design multi-cloud strategies
- Migrate between cloud providers
- Select cloud services for specific workloads
- Implement cloud-agnostic architectures
- Optimize costs across providers

## Cloud Service Comparison

### Compute Services

| AWS     | Azure               | GCP             | Use Case           |
| ------- | ------------------- | --------------- | ------------------ |
| EC2     | Virtual Machines    | Compute Engine  | IaaS VMs           |
| ECS     | Container Instances | Cloud Run       | Containers         |
| EKS     | AKS                 | GKE             | Kubernetes         |
| Lambda  | Functions           | Cloud Functions | Serverless         |
| Fargate | Container Apps      | Cloud Run       | Managed containers |

### Storage Services

| AWS     | Azure           | GCP             | Use Case       |
| ------- | --------------- | --------------- | -------------- |
| S3      | Blob Storage    | Cloud Storage   | Object storage |
| EBS     | Managed Disks   | Persistent Disk | Block storage  |
| EFS     | Azure Files     | Filestore       | File storage   |
| Glacier | Archive Storage | Archive Storage | Cold storage   |

### Database Services

| AWS         | Azure            | GCP           | Use Case        |
| ----------- | ---------------- | ------------- | --------------- |
| RDS         | SQL Database     | Cloud SQL     | Managed SQL     |
| DynamoDB    | Cosmos DB        | Firestore     | NoSQL           |
| Aurora      | PostgreSQL/MySQL | Cloud Spanner | Distributed SQL |
| ElastiCache | Cache for Redis  | Memorystore   | Caching         |

**Reference:** See `references/service-comparison.md` for complete comparison

## Multi-Cloud Patterns

### Pattern 1: Single Provider wi