terraform

How to import an existing resource with TFC

1. Move all sensitive variables from TFC to prod.auto.tfvars
2. Declare the resource in Terraform code
3. Do terraform import with -var-file=prod.auto.tfvars
4. Try terraform plan and potentially fix resource declaration in Terraform
5. Move back sensitive variables to TFC
6. Do a plan and apply again in TFC

Notice: you may not be able to import multiple resources at once if there is dependency among them

HashiCorp official reference