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‎24-Azure-AKS-Terraform/24-05-Create-AKS-Cluster-Custom-VNET/README.md

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# Create AKS Cluster using Custom Virtual Network
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## Step-01: Introduction
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- Create a Custom Virtual Network and Subnet
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- Reference the same in AKS Cluster and Node Pools linux and windows
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- Create the AKS Cluster with nodepools on custom vnet
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- Deploy sample Apps and test
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- Destroy the cluster after tests
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## Step-02: Create Virtual Network and AKS Default Subnet
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- Create Virtual Network using Terraform
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```
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## Step-04: Update variables.tf with environment name
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- We are also going to change cluster environment name as prod2
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- We are also going to change cluster environment name as dev2
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```
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# Azure AKS Environment Name
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variable "environment" {
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type = string
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description = "This variable defines the Environment"
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default = "prod2"
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default = "dev2"
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}
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```
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## Step-05: Add below for default system, Linux, windows nodepools
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- We will add this in following files
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- 07-aks-cluster.tf
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- 07-aks-cluster.tf in default node pool
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- 08-aks-cluster-linux-user-nodepools.tf
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- 09-aks-cluster-windows-user-nodepools.tf
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```
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# AKS Default Subnet ID
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vnet_subnet_id = azurerm_subnet.aks-default.id
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vnet_subnet_id = azurerm_subnet.aks-default.id
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```
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## Step-06: Deploy Terraform Resources
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## Step-07: Verify if Nodepools added successfully
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```
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# List Node Pools
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az aks nodepool list --resource-group terraform-aks --cluster-name terraform-aks-prod2 --output table
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az aks nodepool list --resource-group terraform-aks-dev2 --cluster-name terraform-aks-dev2-cluster --output table
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# List Nodes using Labels
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kubectl get nodes -o wide
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kubectl get nodes -o wide -l nodepoolos=linux
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kubectl get nodes -o wide -l nodepoolos=windows
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kubectl get nodes -o wide -l environment=production
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kubectl get nodes -o wide -l environment=dev2
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```
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- Dotnet App to Windows Nodepool
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```
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# Change Directory
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cd 24-04-Create-AKS-NodePools-using-Terraform/
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cd 24-05-Create-AKS-Cluster-Custom-VNET/
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# Deploy All Apps
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kubectl apply -R -f kube-manifests/
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## Step-08: Destroy our Terraform Cluster
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```
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# Change Directory
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cd 24-04-Create-AKS-NodePools-using-Terraform/v3-terraform-manifests-aks
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cd 24-05-Create-AKS-Cluster-Custom-VNET/terraform-manifests-aks-custom-vnet
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# Destroy all our Terraform Resources
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terraform destroy

‎24-Azure-AKS-Terraform/24-05-Create-AKS-Cluster-Custom-VNET/kube-manifests/01-Webserver-Apps/01-NginxApp1-Deployment.yml

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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: app1-nginx-deployment
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labels:
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app: app1-nginx
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: app1-nginx
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template:
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metadata:
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labels:
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app: app1-nginx
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spec:
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containers:
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- name: app1-nginx
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image: stacksimplify/kube-nginxapp1:1.0.0
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ports:
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- containerPort: 80
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# To schedule pods on based on NodeSelectors
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nodeSelector:
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app: system-apps
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‎24-Azure-AKS-Terraform/24-05-Create-AKS-Cluster-Custom-VNET/kube-manifests/01-Webserver-Apps/02-NginxApp1-LoadBalancer-Service.yml

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apiVersion: v1
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kind: Service
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metadata:
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name: app1-nginx-clusterip-service
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labels:
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app: app1-nginx
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spec:
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type: LoadBalancer
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selector:
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app: app1-nginx
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ports:
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- port: 80
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targetPort: 80

‎24-Azure-AKS-Terraform/24-05-Create-AKS-Cluster-Custom-VNET/kube-manifests/02-Java-Apps/00-storage-class.yml

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apiVersion: storage.k8s.io/v1
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kind: StorageClass
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metadata:
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name: managed-premium-retain-sc
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provisioner: kubernetes.io/azure-disk
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reclaimPolicy: Retain # Default is Delete, recommended is retain
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volumeBindingMode: WaitForFirstConsumer # Default is Immediate, recommended is WaitForFirstConsumer
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allowVolumeExpansion: true
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parameters:
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storageaccounttype: Premium_LRS # or we can use Standard_LRS
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kind: managed # Default is shared (Other two are managed and dedicated)
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##############################################################################
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# Note-1:
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#volumeBindingMode: Immediate - This setting implies that the PersistentVolumecreation,
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#followed with the storage medium (Azure Disk in this case) provisioning is triggered as
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#soon as the PersistentVolumeClaim is created.
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# Note-2:
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# volumeBindingMode: WaitForFirstConsumer
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#By default, the Immediate mode indicates that volume binding and dynamic provisioning
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#occurs once the PersistentVolumeClaim is created. For storage backends that are
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#topology-constrained and not globally accessible from all Nodes in the cluster,
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#PersistentVolumes will be bound or provisioned without knowledge of the Pod's scheduling
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#requirements. This may result in unschedulable Pods.
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#A cluster administrator can address this issue by specifying the WaitForFirstConsumer
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#mode which will delay the binding and provisioning of a PersistentVolume until a
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#Pod using the PersistentVolumeClaim is created. PersistentVolumes will be selected or
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#provisioned conforming to the topology that is specified by the Pod's scheduling
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#constraints.
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##############################################################################
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# Note-3:
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#reclaimPolicy: Delete - With this setting, as soon as a PersistentVolumeClaim is deleted,
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#it also triggers the removal of the corresponding PersistentVolume along with the
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#Azure Disk.
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#We will be surprised provided if we intended to retain that data as backup.
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# reclaimPolicy: retain - Disk is retained even when PVC is deleted - Recommended Option
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# Note-4:
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# Both reclaimPolicy: Delete and volumeBindingMode: Immediate are default settings
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##############################################################################
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# Note-5:
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# Additional Reference
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# https://kubernetes.io/docs/concepts/storage/storage-classes/#azure-disk
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# Managed: When managed used, that disk is persisted for the Lifecycle of the cluster.
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# If we delete cluster, it will delete the disk
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##############################################################################

‎24-Azure-AKS-Terraform/24-05-Create-AKS-Cluster-Custom-VNET/kube-manifests/02-Java-Apps/01-persistent-volume-claim.yml

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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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name: azure-managed-disk-pvc
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spec:
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accessModes:
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- ReadWriteOnce
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storageClassName: managed-premium-retain-sc
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resources:
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requests:
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storage: 5Gi

‎24-Azure-AKS-Terraform/24-05-Create-AKS-Cluster-Custom-VNET/kube-manifests/02-Java-Apps/02-UserManagement-ConfigMap.yml

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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: usermanagement-dbcreation-script
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data:
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mysql_usermgmt.sql: |-
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DROP DATABASE IF EXISTS webappdb;
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CREATE DATABASE webappdb;

‎24-Azure-AKS-Terraform/24-05-Create-AKS-Cluster-Custom-VNET/kube-manifests/02-Java-Apps/03-mysql-deployment.yml

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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: mysql
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: mysql
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strategy:
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type: Recreate
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template:
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metadata:
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labels:
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app: mysql
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spec:
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containers:
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- name: mysql
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image: mysql:5.6
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env:
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- name: MYSQL_ROOT_PASSWORD
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value: dbpassword11
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ports:
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- containerPort: 3306
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name: mysql
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volumeMounts:
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- name: mysql-persistent-storage
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mountPath: /var/lib/mysql
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- name: usermanagement-dbcreation-script
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mountPath: /docker-entrypoint-initdb.d #https://hub.docker.com/_/mysql Refer Initializing a fresh instance
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volumes:
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- name: mysql-persistent-storage
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persistentVolumeClaim:
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claimName: azure-managed-disk-pvc
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- name: usermanagement-dbcreation-script
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configMap:
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name: usermanagement-dbcreation-script
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# To schedule pods on based on NodeSelectors
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nodeSelector:
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app: java-apps

‎24-Azure-AKS-Terraform/24-05-Create-AKS-Cluster-Custom-VNET/kube-manifests/02-Java-Apps/04-mysql-clusterip-service.yml

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apiVersion: v1
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kind: Service
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metadata:
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name: mysql
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spec:
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selector:
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app: mysql
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ports:
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- port: 3306
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clusterIP: None # This means we are going to use Pod IP

‎24-Azure-AKS-Terraform/24-05-Create-AKS-Cluster-Custom-VNET/kube-manifests/02-Java-Apps/06-UserMgmtWebApp-Deployment.yml

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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: usermgmt-webapp
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labels:
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app: usermgmt-webapp
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: usermgmt-webapp
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template:
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metadata:
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labels:
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app: usermgmt-webapp
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spec:
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initContainers:
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- name: init-db
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image: busybox:1.31
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command: ['sh', '-c', 'echo -e "Checking for the availability of MySQL Server deployment"; while ! nc -z mysql 3306; do sleep 1; printf "-"; done; echo -e " >> MySQL DB Server has started";']
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containers:
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- name: usermgmt-webapp
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image: stacksimplify/kube-usermgmt-webapp:1.0.0-MySQLDB
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imagePullPolicy: Always
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ports:
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- containerPort: 8080
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env:
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- name: DB_HOSTNAME
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value: "mysql"
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- name: DB_PORT
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value: "3306"
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- name: DB_NAME
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value: "webappdb"
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- name: DB_USERNAME
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value: "root"
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- name: DB_PASSWORD
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value: "dbpassword11"
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# To schedule pods on based on NodeSelectors
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nodeSelector:
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app: java-apps
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‎24-Azure-AKS-Terraform/24-05-Create-AKS-Cluster-Custom-VNET/kube-manifests/02-Java-Apps/07-UserMgmtWebApp-Service.yml

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apiVersion: v1
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kind: Service
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metadata:
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name: usermgmt-webapp-service
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labels:
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app: usermgmt-webapp
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spec:
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type: LoadBalancer
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selector:
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app: usermgmt-webapp
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ports:
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- port: 80
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targetPort: 8080

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