Some resources in Terraform allow to pass them a list if multiple values can be set - for instance, DNS servers for the azurerm_virtual_network can be set this way. However, on the same resouce, you can add subnet during the creation and this would not work in the same way, because each subnet requires their own subnet-block in the resource. However, Terraform offers a way to create mutiple blocks of the same kind dynamically - using the dynamic-block.
As shown above, instead of providing the block name for the subnet, we added a dynamic-block named subnet. The naming of the dynamic block is important, as it must be named like the block the resouce expects. In this case: subnet. Each dynamic-block has a for_each statement. This is the list of blocks you want to create, typically provided as a list in form of a variable. Last, the actual properties are provided in the content block. You address each property using the following notation: <name of block>.value.<name of property> - in this case, subnet.value.name and so on.
It helps to provide those information in form of a variable as shown above and to put this resource into a module.
You can even nest several dynamic block within each other. One example for this would be the Azure Firewall Rule Collection Group (hate this name…).
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