Multi-Cloud Deployment Patterns: AWS, Azure, GCP & Kubernetes

1. Why Modern Enterprises Choose Multi-Cloud

Relying exclusively on a single cloud hyperscaler exposes an organization to existential business risks: service outages that bring down global operations, regional regulatory data sovereignty mandates, and sudden price hikes or contract lock-in.

Modern architectures adopt a deliberate multi-cloud strategy for three distinct advantages:

Disaster Resilience: Active-passive or active-active failover across completely independent cloud platforms.
Best-of-Breed Capabilities: Leveraging Google Cloud for advanced BigQuery and AI workflows, AWS for mature serverless and compute ecosystems, and Azure for enterprise Active Directory and Windows integrations.
Geographic and Regulatory Compliance: Storing data in localized regional providers to satisfy stringent GDPR and data residency laws.

2. Key Architectural Patterns

Pattern A: Primary Cloud with Cross-Cloud Standby

The production workload runs on AWS, while a warm standby replica is maintained on Google Cloud or Microsoft Azure. Database records are asynchronously mirrored, and global DNS (e.g. Route 53 or Cloudflare) routes traffic to the secondary cloud if health checks fail.

Pattern B: Kubernetes as the Universal Compute Abstraction

By targeting Kubernetes (EKS, AKS, GKE), application container images run identically across all clouds. TellIaC provisions the underlying VPCs and Kubernetes worker nodes on each provider, then deploys standard Helm/K8s manifests across both.

# Multi-Cloud Architectural Topology (ASCII Diagram)
                [ Global Anycast DNS / CDN ]
                             │
              ┌──────────────┴──────────────┐
              ▼                             ▼
       [ AWS us-east-1 ]             [ GCP us-central1 ]
    ┌──────────────────────┐      ┌──────────────────────┐
    │ VPC: 10.100.0.0/16   │      │ VPC: 10.200.0.0/16   │
    │ EKS Kubernetes Node  │◄────►│ GKE Kubernetes Node  │ (Cross-Cloud VPN)
    │ AWS S3 Primary Store │      │ GCS Replicated Store │
    └──────────────────────┘      └──────────────────────┘

3. Provisioning Multi-Cloud in a Single TellIaC File

In traditional tools, coordinating multi-cloud configurations requires juggling multiple provider blocks, complex alias tags, and inconsistent attribute names. In TellIaC, you declare providers and resources in natural English sentences:

# main.hiac — Multi-Cloud Provisioning in Plain English
Use provider "aws" region "us-east-1" for environment "production".
Use provider "gcp" project "enterprise-ops-412" region "us-central1" for environment "production".
Use provider "k8s" context "gke-cluster" namespace "production" for environment "production".

# AWS Network Stack
Create 1 "aws_vpc" resource named "aws_primary_vpc" with cidr_block "10.100.0.0/16" in environment "production".
Create 1 "aws_s3_bucket" resource named "app_primary_storage" with bucket_name "corp-app-primary-data-2026" in environment "production".

# GCP Disaster Recovery Stack
Create 1 "gcp_vpc" resource named "gcp_standby_vpc" with cidr_block "10.200.0.0/16" in environment "production".
Create 1 "gcp_storage_bucket" resource named "app_backup_storage" with bucket_name "corp-app-gcp-backup-2026" in environment "production".

# Kubernetes Workload Deployment
Create 1 "k8s_deployment" resource named "api_service" with replicas 3, image "registry.hub.docker.com/corp/api:v2.6" in environment "production".

Output "aws_vpc_id" as the id of "aws_primary_vpc" in environment "production".
Output "gcp_vpc_id" as the id of "gcp_standby_vpc" in environment "production".

4. Managing Network Egress Costs and Latency

💸

The Egress Trap Cloud providers do not charge for incoming data (ingress), but charge steep fees for data leaving their networks (egress). Avoid high-frequency synchronous database queries across clouds. Keep transactional workloads contained within a single cloud boundary and replicate only compressed delta streams asynchronously.

Always utilize telliac cost before provisioning multi-cloud setups to evaluate estimated monthly spend across providers:

telliac cost --env production

Next in the Series: Learn how to secure your infrastructure code and state files:
IaC Security Best Practices: Secrets Hardening, Least-Privilege IAM & State Protection →