Synchronize HCP Consul services as backend address pools for Microsoft Azure Application Gateway using Consul-Terraform-Sync (CTS) to automate the synchronization of service changes in Consul open source or Enterprise to Azure Application Gateway. CTS uses a HashiCorp Terraform module compatible with HashiCorp Consul-Terraform-Sync to connect to the service catalog of HashiCorp Cloud Platform (HCP) Consul and monitor for service-level changes. When a change is detected, it runs a Terraform module in response to an event and automates the target resource of your choice, offering a GitOps workflow for managing an application gateway. CTS connects to the service catalog of HCP Consul and monitors for service-level changes. It then uses this information to automatically add new services as backend address pools to a load balancer in Azure Application Gateway, ensuring that any changes made to services are reflected in the configuration. The example demonstrates how to set up a Consul cluster and register services to its catalog, configure Consul-Terraform-Sync, and automate Azure Application Gateway using CTS. By running CTS locally and passing information about the Azure resource group, location, public IP, service subnet, and port of the application gateway as Terraform variable files, you can dynamically generate a request routing rule, HTTP listener, and URL path map for routes. After running CTS, access the services using the load balancer's frontend public IP address and make API calls to the web service at the /web path to verify that the backend address pool has been updated correctly. The example also shows how Consul-Terraform-Sync runs as a daemon, monitoring for changes to the services in Consul's catalog and responding to these changes by running Terraform modules. This enables a GitOps workflow to update and continuously deliver changes to your Azure networking resources. By using CTS with a declarative Terraform module, you can implement a secure and efficient way to manage your application gateway configuration.