You want to use terraform import to start managing infrastructure that was not originally provisioned...

The current implementation of Terraform import can only import resources into the state. It does not generate a configuration. Because of this, and prior to running terraform import, it is necessary to manually write a resource configuration block for the resource to which the imported object will be mapped.

First, add the resources to the configuration file:

resource "aws_instance" "example" {

# ...instance configuration...

}

Then run the following command:

$ terraform import aws_instance.example i-abcd1234