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Create Azure AKS Cluster using Custom Virtual Network

Step-01: Introduction

  • Create a Custom Virtual Network and Subnet
  • Reference the same in AKS Cluster and Node Pools linux and windows
  • Create the AKS Cluster with nodepools on custom vnet
  • Deploy sample Apps and test
  • Destroy the cluster after tests

Azure Kubernetes Service with Azure DevOps and Terraform

Step-02: Create Virtual Network and AKS Default Subnet

  • Create Virtual Network using Terraform
  • Create a separate subnet for AKS Nodepools
  • Create a file named 11-virtual-network.tf 
    # Create Virtual Network
resource "azurerm_virtual_network" "aksvnet" {
  name                = "aks-network"
  location            = azurerm_resource_group.aks_rg.location
  resource_group_name = azurerm_resource_group.aks_rg.name
  address_space       = ["10.0.0.0/8"]
}

# Create a Subnet for AKS
resource "azurerm_subnet" "aks-default" {
  name                 = "aks-default-subnet"
  virtual_network_name = azurerm_virtual_network.aksvnet.name
  resource_group_name  = azurerm_resource_group.aks_rg.name
  address_prefixes     = ["10.240.0.0/16"]
}

Step-03: Update 01-main.tf to change the state storage key name

  • We are going to change the state storage key name considering this as a separate cluster for us because old cluster we destroyed using terraform destroy 
    # Configure Terraform State Storage
terraform {
  backend "azurerm" {
    resource_group_name   = "terraform-storage-rg"
    storage_account_name  = "terraformstatexlrwdrzs"
    container_name        = "prodtfstate"
    key                   = "terraform-custom-vnet.tfstate"
  }
}

Step-04: Update variables.tf with environment name

  • We are also going to change cluster environment name as dev2 
    # Azure AKS Environment Name
variable "environment" {
  type = string  
  description = "This variable defines the Environment"  
  default = "dev2"
}

Step-05: Add below for default system, Linux, windows nodepools

  • We will add this in following files
  • 07-aks-cluster.tf in default node pool
  • 08-aks-cluster-linux-user-nodepools.tf
  • 09-aks-cluster-windows-user-nodepools.tf 
    # AKS Default Subnet ID
vnet_subnet_id        = azurerm_subnet.aks-default.id

Step-06: Deploy Terraform Resources

# Change Directory to Terraform Manifests folder
cd 24-05-Create-AKS-Cluster-Custom-VNET/terraform-manifests-aks-custom-vnet

# Initialize Terraform
terraform init

# Validate Terraform manifests
terraform validate

# Review the Terraform Plan
terraform plan   # Verify terraform storage account in Azure to see if new file got created

# Deploy Terraform manifests
terraform apply

Step-07: Verify if Nodepools added successfully

# List Node Pools
az aks nodepool list --resource-group terraform-aks-dev2 --cluster-name  terraform-aks-dev2-cluster --output table

# Configure kubectl with Default Admin Credentials
az aks get-credentials --resource-group terraform-aks-dev2 --name  terraform-aks-dev2-cluster --admin

# 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=dev2

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 24-05-Create-AKS-Cluster-Custom-VNET/

# 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 24-05-Create-AKS-Cluster-Custom-VNET/terraform-manifests-aks-custom-vnet

# Destroy all our Terraform Resources
terraform destroy

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