---
title: Multi Cloud Architecture
category: product
entity_type: skill
price: $15
canonical: https://forgehouse.ai/skills/multi-cloud-architecture/
lang: en
hreflang_alt: https://forgehouse.ai/tr/skiller/multi-cloud-architecture/
last_updated: 2026-06-20
---

# Multi Cloud Architecture

> Design multi-cloud architectures using a decision framework to select and integrate services…

A decision framework and battle-tested integration patterns for running workloads across AWS, Azure, and GCP at the same time. It treats every provider as an isolated blast radius, builds a provider-agnostic abstraction layer (Kubernetes, Terraform, PostgreSQL), and keeps the operational complexity of multi-cloud honest rather than letting it spiral. Ships ready-to-use Terraform replication configs, failover orchestration, and an egress-cost calculator so you avoid the four-figure surprise bill.

## Use cases
- Deciding whether a workload truly needs multi-cloud or just multi-region in one provider
- Planning a migration from one cloud provider to another without lock-in
- Building cross-cloud disaster recovery with automated DNS failover
- Meeting data sovereignty / GDPR requirements with EU-only region placement
- Designing a cloud-agnostic abstraction layer for EKS/AKS/GKE on one manifest
- Estimating cross-cloud egress fees before they wreck the budget

## Benefits
- Survive a full provider outage without taking down your other workloads
- Escape vendor lock-in so a provider switch becomes days of work, not months
- Catch egress-cost bombs before they hit your invoice instead of after
- Recover from disaster against measured RTO < 4h / RPO < 1h targets, not hopes

## What’s included
- AWS/Azure/GCP service comparison matrix across compute, containers, storage, and databases
- Four named multi-cloud patterns: single-provider + DR, best-of-breed, geographic distribution, cloud-agnostic abstraction
- Terraform replication configs that filter to critical-tier data only and use cold storage
- Provider-agnostic adapter interface so app code never calls a vendor SDK directly
- Health-check-driven failover orchestration with consecutive-failure thresholds
- Egress cost table (same-region / cross-region / internet) plus an 8-point pre-launch verification checklist

## Who it’s for
Platform and DevOps engineers architecting or migrating systems that span more than one cloud provider and need lock-in avoidance, cross-cloud DR, or data-residency control.

## How it runs
Does this system actually need a second cloud? That question opens the framework, because regulation and lock-in risk justify multi-cloud while fashion does not, and egress fees punish guessing.
1. Opens with the Ockham gate: is multi-cloud actually justified? Only regulation and data residency, vendor lock-in risk or genuine best-of-breed needs pass; everybody is doing it does not, and single-cloud multi-region is the recommended default otherwise.
2. Picks the pattern deliberately: single provider plus DR standby, best-of-breed split (general compute on one cloud, ML and analytics on another), geographic distribution for sovereignty, or a full cloud-agnostic abstraction layer.
3. Builds on abstractions instead of SDKs: Kubernetes across EKS/AKS/GKE, shared Terraform modules instead of per-cloud IaC, and provider-agnostic interfaces (one ObjectStorage interface with S3, Blob and GCS adapters) so lock-in cannot creep back in through code.
4. Prices the egress before designing replication: cross-cloud transfer runs around $0.09 per GB, so only tag-filtered critical data replicates to cold tiers in batches; naive full replication is called out as a monthly four-figure trap.
5. Wires failover as orchestration: health endpoints on every provider, DNS failover after 3 consecutive failures, async replication with eventual consistency accepted by design, and a written runbook naming who approves the switch.
6. Signs off against an 8-item checklist: chaos-tested blast radius (one provider down, the other unaffected), egress budget verified, IAM federation, locked remote Terraform state, measured RTO/RPO drill, unified monitoring and consistent cost tags.

## FAQ
### We only run on AWS today. Is this useful before we actually add a second cloud?
Yes, and arguably most useful then. The decision framework's first job is testing whether your workload truly needs multi-cloud or just multi-region in one provider, and the egress cost table shows you the bill impact before you commit to anything.

### How does the abstraction layer actually keep my code off vendor SDKs?
It standardizes on a portable core (Kubernetes, Terraform, PostgreSQL) and puts a provider-agnostic adapter interface between your app and each cloud. Application code calls the adapter, never AWS or Azure SDKs directly, so swapping a provider means swapping an adapter implementation.

### Does it migrate my running workloads to another cloud for me?
No. It ships the Terraform replication configs, failover orchestration, and an 8-point pre-launch checklist, but executing the migration and operating the second provider remains your team's work. It de-risks the plan, it does not run it.

## Price
$15, one-time, no subscription. VAT included.

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