エラー内容

既にGUIやgcloudコマンドなどで作成済みのリソースをTerraformで作成しようとした際にコンフリクトが起きて、terraform applyがエラーになります。

以下がtfstateを配置するバケットを定義した状態でapplyしようとした例です。

Error: googleapi: Error 409: Your previous request to create the named bucket succeeded and you already own it., conflict
│
│   with google_storage_bucket.store_of_tfstate,
│   on gcs.tf line 1, in resource "google_storage_bucket" "store_of_tfstate":
│    1: resource "google_storage_bucket" "store_of_tfstate" {
│

対処方法

terraform importコマンドを使用して対象のリソースをTerraform管理に取り込みます。

$ terraform import google_storage_bucket.store_of_tfstate your-bucket

google_storage_bucket.store_of_tfstate: Importing from ID "your-bucket"...
google_storage_bucket.store_of_tfstate: Import prepared!
  Prepared google_storage_bucket for import
google_storage_bucket.store_of_tfstate: Refreshing state... [id=your-bucket]

Import successful!

The resources that were imported are shown above. These resources are now in
your Terraform state and will henceforth be managed by Terraform.

再度applyすると成功します。

$ terraform applly
Apply complete! Resources: 0 added, 1 changed, 0 destroyed.