To enable access to various Azure resources via given virtual networks and subnets, we have to setup allowd subnets using virtual network rules in Azure resources. For example Azure Cognitive Account can be restricted to access only from given virtual networks and subnets. This requirement of allowed virtual networks and subnets may changed based on the deploying environment such as develop, qa or production. Let's look at how to write a terraform dynamic block to handle such scenarios, using Azure Cognitive Account virtual network rule as example, which can be used in other Azure resources as well.
Full sample code with Azure Cognitive Account is available here in GitHub.
