Fixing broken AKS/AGIC sample (#240)

* Fixing broken sample and update

---------

Co-authored-by: hezijie <lonegunmanb@hotmail.com>

quickstart/201-k8s-cluster-with-aks-applicationgateway-ingress/readme.md

@@ -6,15 +6,16 @@ This template creates an Application Gateway Ingress Controller in Azure Kuberne
 
 - [random_pet](https://registry.terraform.io/providers/hashicorp/random/latest/docs/resources/pet)
 - [azurerm_resource_group](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/resource_group)
-- [azurerm_user_assigned_identity](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/user_assigned_identity)
 - [azurerm_virtual_network](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/virtual_network)
-- [azurerm_subnet](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/subnet)
+- [azurerm_user_assigned_identity](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/user_assigned_identity)
+- [azurerm_kubernetes_cluster](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/kubernetes_cluster)
 - [azurerm_public_ip](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/public_ip)
 - [azurerm_application_gateway](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/application_gateway)
-- [azurerm_kubernetes_cluster](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/kubernetes_cluster)
+- [azurerm_role_assignment](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/role_assignment)
 
 ## Terraform data sources
 - [azurerm_subnet](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/data-sources/subnet)
+- [azurerm_user_assigned_identity](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/data-sources/user_assigned_identity)
 
 ## Variables
 
@@ -23,26 +24,24 @@ This template creates an Application Gateway Ingress Controller in Azure Kuberne
 | `resource_group_name_prefix` | Prefix of the resource group name that's combined with a random ID so name is unique in your Azure subscription. | rg |
 | `resource_group_location` | Location of the resource group. | eastus |
 | `virtual_network_name` | Virtual network name. | aksVirtualNetwork |
-| `virtual_network_address_prefix` | VNET address prefix. | 192.168.0.0/16 |
-| `aks_subnet_name` | Subnet name. | kubesubnet |
-| `aks_subnet_address_prefix` | Subnet address prefix. | 192.168.0.0/24 |
-| `app_gateway_subnet_address_prefix` | Subnet server IP address. | 192.168.1.0/24 |
+| `virtual_network_address_prefix` | VNET address prefix. | 10.1.0.0/18 |
+| `aks_subnet_name` | Subnet name. | akssubnet |
+| `appgw_subnet_name` | Subnet name. | appgwsubnet |
+| `aks_cluster_name` | The name of the Managed Kubernetes Cluster to create. | aks-cluster |
+| `aks_os_disk_size` | (Optional) The size of the OS Disk which should be used for each agent in the Node Pool. | 50 |
+| `aks_node_count` | "(Optional) The initial number of nodes which should exist in this Node Pool." | 3 |
+| `aks_sku_tier` | (Optional) The SKU tier that should be used for this Kubernetes Cluster. Possible values are Free and Paid (which includes the Uptime SLA). | Free |
+| `aks_vm_size` | The size of the virtual machine. | Standard_D3_v2 |
+| `kubernetes_version` | (Optional) Version of Kubernetes specified when creating the AKS managed cluster.| 1.19.11 |
+| `aks_service_cidr` | (Optional) The Network Range used by the Kubernetes service. | 192.168.0.0/20 |
+| `aks_dns_service_ip` | (Optional) IP address within the Kubernetes service address range that will be used by cluster service discovery (kube-dns). | 192.168.0.10 |
+| `aks_docker_bridge_cidr` | (Optional) IP address (in CIDR notation) used as the Docker bridge IP address on nodes. | 172.17.0.1/16 |
+| `aks_private_cluster` | (Optional) Should this Kubernetes Cluster have its API server only exposed on internal IP addresses? This provides a Private IP Address for the Kubernetes API on the Virtual Network where the Kubernetes Cluster is located. | false |
+| `aks_subnet_address_prefix` | Subnet address prefix. | 10.1.0.0/22 |
+| `app_gateway_subnet_address_prefix` | Subnet address prefix. | 10.1.4.0/24 |
 | `app_gateway_name` | Name of the Application Gateway. | ApplicationGateway1 |
-| `app_gateway_sku` | Name of the Application Gateway SKU. | Standard_v2 |
-| `app_gateway_tier` | Tier of the Application Gateway tier. | Standard_v2 |
-| `aks_name` | AKS cluster name. | aks-cluster1 |
-| `aks_dns_prefix` | (Optional) DNS prefix to use with hosted Kubernetes API server FQDN. | aks |
-| `aks_agent_os_disk_size` | Disk size (in GB) to provision for each of the agent pool nodes. This value ranges from 0 to 1023. Value of 0 applies the default disk size for that agentVMSize. | 40 |
-| `aks_agent_count` | The number of agent nodes for the cluster. | 3 |
-| `aks_agent_vm_size` | VM size. | Standard_D3_v2 |
-| `kubernetes_version` | Kubernetes version | 1.11.5 |
-| `aks_service_cidr` | CIDR notation IP range from which to assign service cluster IPs. | 10.0.0.0/16 |
-| `aks_dns_service_ip` | DNS server IP address. | 10.0.0.10 |
-| `aks_docker_bridge_cidr` | CIDR notation IP for Docker bridge. | 172.17.0.1/16 |
-| `aks_enable_rbac` | Enable RBAC on the AKS cluster. | false |
-| `msi_id` | The Managed Service Identity ID. Set this value if you're running this example using Managed Identity as the authentication method. | null |
-| `vm_user_name` | User name for the VM. | vmuser1 |
-| `public_ssh_key_path` | Public key path for SSH. | ~/.ssh/id_rsa.pub |
+| `app_gateway_tier` | Tier of the Application Gateway. | Standard_v2 |
+| `aks_enable_rbac` | (Optional) Is Role Based Access Control based on Azure AD enabled? | false |
 
 ## Example