Multi-Cloud Strategy Cheat Sheet

Key architectural patterns, tooling, and tradeoffs for running workloads across AWS, Azure, and GCP simultaneously.

2 PagesAdvancedFeb 8, 2026

Terraform Multi-Provider Config

Provision resources on two clouds from one Terraform config.

yaml

# providers.tfprovider "aws" {  region = "us-east-1"}provider "google" {  project = "my-gcp-project"  region  = "us-central1"}resource "aws_s3_bucket" "backup" {  bucket = "my-cross-cloud-backup"}resource "google_storage_bucket" "primary" {  name     = "my-primary-bucket"  location = "US"}

Common Drivers for Multi-Cloud

Key common drivers for multi-cloud to know.

Avoiding Vendor Lock-in- Preserve leverage in pricing negotiations and reduce single-provider risk
Best-of-Breed Services- Use each provider's strongest offering (e.g. BigQuery for analytics, Azure AD for identity)
Regulatory/Data Residency- Some jurisdictions or contracts require specific providers or regions
Mergers & Acquisitions- Combined companies often inherit workloads on different clouds
Disaster Recovery- A secondary provider protects against a full outage of the primary

Abstraction & Tooling

Key abstraction & tooling to know.

Terraform- Single IaC tool with providers for AWS, Azure, GCP, and hundreds more
Kubernetes- Common workload abstraction layer portable across EKS, AKS, GKE
Crossplane- Kubernetes-native control plane for provisioning multi-cloud infrastructure
Service Mesh (Istio/Linkerd)- Consistent networking, security, and observability across clusters/clouds
Identity Federation- SSO/SAML/OIDC to unify authentication across providers

Pitfalls to Avoid

Key pitfalls to avoid to know.

Least-Common-Denominator Design- Avoiding all provider-specific features can sacrifice reliability and cost benefits
Data Gravity- Large datasets are expensive/slow to move; plan data placement carefully
Duplicated Operational Overhead- Each provider needs its own monitoring, IAM, and cost management setup
Cross-Cloud Egress Cost- Data transfer between clouds is often billed at premium rates

Pro Tip

Don't pursue multi-cloud for its own sake — a true active-active multi-cloud architecture multiplies operational complexity; most organizations get 80% of the risk-reduction benefit from a single primary cloud plus a cold/warm DR plan on a second provider.

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