Setup after decommissioning a landing zone - AWS Control Tower

Setup after decommissioning a landing zone

After you decommission your landing zone, you cannot successfully execute setup again until manual cleanup is complete. Also, without manual cleanup of these remaining resources, you may incur unexpected billing charges. You must attend to these issues:

  • The AWS Control Tower management account is part of the AWS Control Tower Root OU. Be sure that these IAM roles and IAM policies are removed from the management account:

    • Roles:

      - AWSControlTowerAdmin

      - AWSControlTowerCloudTrailRole

      - AWSControlTowerStackSetRole

    • Policies:

      - AWSControlTowerAdminPolicy

      - AWSControlTowerCloudTrailRolePolicy

      - AWSControlTowerStackSetRolePolicy

  • You may wish to delete or update the existing AWS SSO configuration for AWS Control Tower before you up a landing zone again, but it is not required that you delete it.

  • You may wish to remove the VPC created by AWS Control Tower.

  • Setup fails if the email addresses specified for the logging or audit accounts are associated with an existing AWS account. You must close the AWS accounts, or use different email addresses to set up a landing zone again.

  • Setup fails if S3 buckets with the following reserved names already exist in the logging account:

    • aws-controltower-logs-{accountId}-{region} (used for the logging bucket).

    • aws-controltower-s3-access-logs-{accountId}-{region} (used for the logging access bucket).

    You must either rename or remove these buckets, or use a different account for the logging account.

  • Setup fails if the management account has the existing log group, aws-controltower/CloudTrailLogs, in CloudWatch Logs. You must either rename or remove the log group.

Note

You cannot set up a new landing zone in an organization with top-level OUs named either Core or Custom. You must rename or remove these OUs to set up a landing zone again.