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aws_datasync_location_s3 で Ensure bucket access role has s3:ListBucket permission

Last updated at Posted at 2022-04-09

事象発生条件

  • terraform
  • AWS DataSync利用
  • クロスリージョンのs3が対象
  • DataSyncはコピー先にいる

事象

  • terraformでクロスリージョン間のs3で、aws_datasync_location_s3を利用した時に以下のエラーが発生しました。
could not perform s3:ListObjectsV2 on bucket xxxxxx.
Access denied. Ensure bucket access role has s3:ListBucket permission.

原因

単純にバケットに権限がないのですが、コピー先の場合は、bucket_access_role_arnに権限がないだけなのですが、コピー元の場合は、その限りではありません。

resource "aws_datasync_location_s3" "xxx" {
  s3_bucket_arn = xxxxx
  subdirectory  = "/"

  s3_config {
    bucket_access_role_arn = xxxxxxxx
  }
}

コピー元の場合は、バケットポリシーに権限がありません。
terraformの実行ユーザの権限がバケットポリシーに割り当てられていないと事象のエラーが発生します。
(試していないないですが、terraformの実行ユーザにバケットポリシーで設定した権限があれば大丈夫かと)
以下の部分のarn:aws:iam::1111222233334444:role/datasync-config-roleですね。

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": [
                    "arn:aws:iam::1111222233334444:role/datasync-config-role",
                    "arn:aws:iam::1111222233334444:role/datasync-transfer-role"
                ]
            },
            "Action": [
                "s3:GetBucketLocation",
                "s3:ListBucket",
                "s3:ListBucketMultipartUploads"
            ],
            "Resource": [
                "arn:aws:s3:::example-source-bucket"
            ]
        },

参考

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