Fixing article

quickstart/201-k8s-cluster-with-tf-and-aks/variables.tf

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+variable "resource_group_name_prefix" {
+  default     = "rg"
+  description = "Prefix of the resource group name that's combined with a random ID so name is unique in your Azure subscription."
+}
+
+variable "resource_group_location" {
+  default     = "eastus"
+  description = "Location of the resource group."
+}
+
+variable "agent_count" {
+  default = 3
+}
+
+variable "ssh_public_key" {
+  default = "~/.ssh/id_rsa.pub"
+}
+
+variable "dns_prefix" {
+  default = "k8stest"
+}
+
+variable "cluster_name" {
+  default = "k8stest"
+}
+
+variable "resource_group_name" {
+  default = "azure-k8stest"
+}
+
+variable "location" {
+  default = "Central US"
+}
+
+variable "log_analytics_workspace_name" {
+  default = "testLogAnalyticsWorkspaceName"
+}
+
+# refer https://azure.microsoft.com/global-infrastructure/services/?products=monitor for log analytics available regions
+variable "log_analytics_workspace_location" {
+  default = "eastus"
+}
+
+# refer https://azure.microsoft.com/pricing/details/monitor/ for log analytics pricing 
+variable "log_analytics_workspace_sku" {
+  default = "PerGB2018"
+}
+
+# these following three entries are placeholder references; we will specify values later in terraform.tfvars
+variable "aks_service_principal_app_id" {
+  default = ""
+}
+
+variable "aks_service_principal_client_secret" {
+  default = ""
+}
+
+variable "aks_service_principal_object_id" {
+  default = ""
+}
+