GitHub repository: reifnir/terraform-azurerm-appgw-ingress-k8s-cluster-fork
Description: The Application Gateway Ingress Controller allows the Azure Application Gateway to be used as the ingress for an Azure Kubernetes Service aka AKS cluster. As shown in the figure below, the ingress controller runs as a pod within the AKS cluster. It consumes Kubernetes Ingress Resources and converts them to an Azure Application Gateway configuration which allows the gateway to load-balance traffic to Kubernetes pods.