Generating multiple blocks with the dynamic block

Terraform resources are defined by the following elements:

• Properties that are in the form property name = value, which we have seen several times in this book
• Blocks that represent a grouping of properties, such as the site_config block inside the azurerm_linux_web_app resource

Depending on the Terraform resource, a block can be present once or even multiple times in the same resource, such as the security_rule block inside the azurerm_network_security_group resource (see the documentation, for example, at  https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/network_security_group).

One of the great features of Terraform is the dynamic block, which allows us to loop the blocks in resources.

In this recipe, we will see how to use the dynamic block to provision an azurerm_network_security_group resource in Azure...