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Import Existing Resources

https://developer.hashicorp.com/terraform/cli/commands/import

https://dev.to/cloudskills/getting-started-with-terraform-on-azure-importing-existing-infrastructure-43fa

  • Manage pre-existing infrastructure by terraform

  • Import manually created resources to be under the control of terraform configurations

simple resource

  • create terraform code

  • import state: terraform init and terraform import <terraform-resource-name>.<resource-label> <azure-resource-id>

  • check new resource in state file: cat terraform.tfstate

  • validate terraform configuration terraform plan should report no changes

multiple resources

  • create terraform code for all resources

  • import state for resources one by one

  • check and validate the states

import module

  • in the folder calling the module with backend.tf run terraform init

  • then for each resource run terraform import module.<module-name>.<terraform-resource-name>.<resource-label> <azure-resource-id

import one of for_each from module

in unix shell, use single quotes to make the inner address be taken literally

terraform import 'module.my_storage.azurerm_storage_container.container["<container-name>"]' \
https://<storage-account>.blob.core.windows.net/<container-name>
in windows the double quotes must be escaped with a backslash and use quotes: 
terraform import 'module.my_storage.azurerm_storage_container.container[\"<container-name>\"]' \
https://<storage-account>.blob.core.windows.net/<container-name>

import with variables

https://stackoverflow.com/questions/57187782/how-to-use-terraform-import-with-passed-in-variables

Note that even variables in the variables.tf that are not used are still required.

terraform import -var 'environment=sandbox' azurerm_storage_account.my_storage foo
terraform import -var-file='../tfvars/prod.tfvars' 'module.MySystem.azurerm_windows_virtual_machine.windsvm["dsvm0003"]' \
"/subscriptions/xxx-xxx-xxx-xxx-xxx/resourceGroups/myRG/providers/Microsoft.Compute/virtualMachines/DSVM0003"

Another way is set default values for the variables in the variables.tf file or set the real value from the state file.

terragrunt: in terragrunt.hcl the inputs section can set the values for the input variables from dependencies. Therefore the best way to import the existing resource is via terragrunt import ADDR ID.