Create Azure AKS Cluster Linux and Windows Node Pools¶

Link to Terraform Configuration Files¶

Link to all the Kubernetes Manifests¶

Step-01: Introduction¶

• Create Windows and Linux Nodepools

Azure Kubernetes Service with Azure DevOps and Terraform¶

Step-02: Create Azure AKS Linux User Node Pool using Terraform¶

• Understand about Terraform resource azurerm_kubernetes_cluster_node_pool
• Create Azure AKS Linux User Node pool
• Create a file named 09-aks-cluster-linux-user-nodepools.tf

  resource "azurerm_kubernetes_cluster_node_pool" "linux101" {
    availability_zones    = [1, 2, 3]
    enable_auto_scaling   = true
    kubernetes_cluster_id = azurerm_kubernetes_cluster.aks.id
    max_count             = 3
    min_count             = 1
    mode                  = "User"
    name                  = "linux101"
    orchestrator_version  = data.azurerm_kubernetes_service_versions.current.latest_version
    os_disk_size_gb       = 30
    os_type               = "Linux" # Default is Linux, we can change to Windows
    vm_size               = "Standard_DS2_v2"
    priority              = "Regular"  # Default is Regular, we can change to Spot with additional settings like eviction_policy, spot_max_price, node_labels and node_taints
    node_labels = {
      "nodepool-type" = "user"
      "environment"   = "production"
      "nodepoolos"    = "linux"
      "app"           = "java-apps"
    }
    tags = {
      "nodepool-type" = "user"
      "environment"   = "production"
      "nodepoolos"    = "linux"
      "app"           = "java-apps"
    }
  }
  

Step-03: Create Azure AKS Windows User Node Pool using Terraform¶

• Create Azure AKS Windows User Node pool to run Windows workloads
• Create a file named 10-aks-cluster-windows-user-nodepools.tf

  resource "azurerm_kubernetes_cluster_node_pool" "win101" {
    availability_zones    = [1, 2, 3]
    enable_auto_scaling   = true
    kubernetes_cluster_id = azurerm_kubernetes_cluster.aks.id
    max_count             = 3
    min_count             = 1
    mode                  = "User"
    name                  = "win101"
    orchestrator_version  = data.azurerm_kubernetes_service_versions.current.latest_version
    os_disk_size_gb       = 30
    os_type               = "Windows" # Default is Linux, we can change to Windows
    vm_size               = "Standard_DS2_v2"
    priority              = "Regular"  # Default is Regular, we can change to Spot with additional settings like eviction_policy, spot_max_price, node_labels and node_taints
    #vnet_subnet_id        = azurerm_subnet.aks-default.id 
    node_labels = {
      "nodepool-type" = "user"
      "environment"   = "production"
      "nodepoolos"    = "windows"
      "app"           = "dotnet-apps"
    }
    tags = {
      "nodepool-type" = "user"
      "environment"   = "production"
      "nodepoolos"    = "windows"
      "app"           = "dotnet-apps"
    }
  }
  

Step-04: Deploy Terraform Manifests with nodepool additions (Linux & Windows)¶

# Change Directory 
cd 24-04-Create-AKS-NodePools-using-Terraform/terraform-manifests-aks

# Initialize Terraform
terraform init

# Validate Terraform manifests
terraform validate

# Review the Terraform Plan
terraform plan 

# Deploy Terraform manifests
terraform apply 

Step-05: Verify if Nodepools added successfully¶

# List Node Pools
az aks nodepool list --resource-group terraform-aks-dev --cluster-name  terraform-aks-dev-cluster --output table

# List Nodes using Labels
kubectl get nodes -o wide
kubectl get nodes -o wide -l nodepoolos=linux
kubectl get nodes -o wide -l nodepoolos=windows
kubectl get nodes -o wide -l environment=dev

Step-06: Deploy Sample Applications for all 3 node pools¶

• Webserver App to System Nodepool
• Sample Java App to Linux Nodepool
• Dotnet App to Windows Nodepool

  # Change Directory 
  cd 24-04-Create-AKS-NodePools-using-Terraform/
  
  # Deploy All Apps
  kubectl apply -R -f kube-manifests/
  
  # List Pods
  kubectl get pods -o wide
  

Step-07: Access Applications¶

# List Services to get Public IP for each service we deployed 
kubectl get svc

# Access Webserver App (Running on System Nodepool)
http://<public-ip-of-webserver-app>/app1/index.html

# Access Java-App (Running on linux101 nodepool)
http://<public-ip-of-java-app>
Username: admin101
Password: password101

# Access Windows App (Running on win101 nodepool)
http://<public-ip-of-windows-app>

Step-08: Destroy our Terraform Cluster¶

# Change Directory 
cd 24-04-Create-AKS-NodePools-using-Terraform/terraform-manifests-aks

# Destroy all our Terraform Resources
terraform destroy

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