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Cluster API

This repository provides the source code for setting up Cluster API on Microsoft Azure using Terraform and Flux: You can use this repository to create a fully automated and scalable workflow for deploying and managing Kubernetes clusters on Azure.

The purpose of the repository is to:

  • Deploy the management cluster with Terraform
  • Bootstrap it with Flux to pull in the Kubernetes manifests and apply them
  • Install Cluster API on top of the management cluster
  • Start deploying additional AKS clusters using Cluster API

Through the use of Flux, we’re able to deploy workload clusters quickly after pull requests are merged. You can use this repository as a template or a reference for your own Cluster API projects on Azure.

Please note this repository is under development and subject to change.

Repository structure

  • clusters - Kustomize manifests for cluster components
    • management - Platform management cluster
    • workloads - Distributed workload clusters
  • manifests - Re-usable Kubernetes manifests for all clusters
  • resources - Terraform files for deploying the management cluster

Getting Started

Generate Deployment Keys

  1. Create .ssh/ directory
  2. Invoke ssh-keygen -t ed25519 -C "[email protected]"
  3. Invoke ssh-keygen -t rsa -b 4096 -C "[email protected]"
  4. Add the id_ed25519.pub file to your repository as "Deploy keys"

Deploy Management Cluster

  1. Navigate to the resources directory
  2. Update the resource_name and location properties in locals.tf file
  3. Update the url property in the providers.tf file
  4. Authenticate Azure session az login
  5. Select desired Azure Subscription az account set -s '{SubscriptionName}'
  6. Initialize Terraform terraform init
  7. Deploy Terraform resources terraform deploy
  8. Authenticate Kubernetes context az aks get-credentials -g '{ResourceGroup}' -n {Name}

Configuring Terraform State Storage has been omitted for brevity

Create Cluster Federation

  1. Browse to the Entra admin center
  2. Create App registration
  3. Navigate to "Certificates & Secrets"
  4. Add Federated credential “Kubernetes accessing Azure resources”
  5. Update cluster details:
    • Cluster issuer URL az aks show -g '{ResourceGroup}' -n '{Name}' --query 'oidcIssuerProfile.issuerUrl'
    • Namespace "capi-azure-system"
    • Service account name "capz-manager"
  6. Browse to the Azure portal
  7. Navigate to the desired Subscription
  8. Select 'Access control (IAM)' and 'Add role assignment'
  9. Select Role - Owner and select 'Members'
  10. Provide the 'Name' of the application from the previous steps

Provision Workload Clusters

  1. Navigate to the manifest/config directory
  2. Update the data properties with desired values
    • global_public_key needs to be base64 encoded version of id_rsa.pub
  3. Deploy Kubernetes manifest kubectl apply -f workloads.yaml

Configuration of Workloads settings can also be deployed by Flux