Terraform Multi-Cloud Module

Terraform module for multi-cloud infrastructure (EKS/GKE)

The goal here is to provision multi-cloud infrastructure using Kubernetes services from different cloud providers (AWS, GCP) that could bring forth several advantages including high availability, optimal performance and increased flexibility.

Prequisites

• AWS Account
• GCP Project
• CLI tools
  • terraform
  • kubectl
  • aws
  • gcloud

Modules

• aws-eks-vpc - EKS compliant VPC
• aws-eks-fargate - EKS cluster with Fargate profile
• aws-eks-lbc-addon - AWS load balancer controller add-on
• aws-ec2-nginx - NGINX server in EC2 instance
• gcp-gke-autopilot - GKE cluster in autopilot mode

Example

1. Create EKS cluster with Fargate profile and AWS load balancer controller

# 1. Go to directory
cd examples/aws-eks-fargate

# 2. Create terraform variables file.
cp terraform.tfvars.sample terraform.tfvars

# 3. Enter AWS credentials in terraform.tfvars
aws_access_key_id     = "<ACCESS_KEY>"
aws_access_secret_key = "<ACCESS_SECRET>"

# 3. Initialize terraform
terraform init

# 4. Apply infrastructure
terraform apply

2. Create GKE cluster in autopilot mode

# 1. Go to directory
cd examples/gcp-gke-autopilot

# 2. Create terraform variables file.
cp terraform.tfvars.sample terraform.tfvars

# 3. Enter GCP project ID in terraform.tfvars
project_id            = "<PROJECT_ID>"

# 3. Initialize terraform
terraform init

# 4. Apply infrastructure
terraform apply

3. Deploy sample application to both EKS and GCP cluster. This will also setup load balancers in respective cloud cluster

# 1. Go to directory
cd examples/multi-cloud-sample-app

# 2. Create terraform variables file.
cp terraform.tfvars.sample terraform.tfvars

# 3. Enter AWS & GCP credentials in terraform.tfvars
aws_access_key_id     = "<ACCESS_KEY>"
aws_access_secret_key = "<ACCESS_SECRET>"
project_id            = "<PROJECT_ID>"

# 3. Initialize terraform
terraform init

# 4. Apply infrastructure
terraform apply

4. Provision NGINX load balancer in EC2 instance which distributes the traffic to EKS & GKE load balancer

# 1. Go to directory
cd examples/multi-cloud-nginx-lb

# 2. Create terraform variables file.
cp terraform.tfvars.sample terraform.tfvars

# 3. Enter AWS & GCP credentials in terraform.tfvars
aws_access_key_id     = "<ACCESS_KEY>"
aws_access_secret_key = "<ACCESS_SECRET>"
project_id            = "<PROJECT_ID>"

# 3. Initialize terraform
terraform init

# 4. Apply infrastructure
terraform apply

Roadmap

• AWS EKS Cluster
• GKE cluster autopilot mode
• EKS multi-region cluster using Global Accelerator
• GKE multi-region cluster using MCS (Multi Cluster Service)
• Multi-cloud load balancing with failover