# Service-linked roles for Cost Optimization Hub


Cost Optimization Hub uses AWS Identity and Access Management (IAM) [service-linked roles](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_terms-and-concepts.html#iam-term-service-linked-role). A service-linked role is a unique type of IAM role that is linked directly to Cost Optimization Hub. Service-linked roles are predefined by Cost Optimization Hub and include all the permissions that the service requires to call other AWS services on your behalf.

A service-linked role makes setting up Cost Optimization Hub easier because you don’t have to manually add the necessary permissions. Cost Optimization Hub defines the permissions of its service-linked roles, and unless defined otherwise, only Cost Optimization Hub can assume its roles. The defined permissions include the trust policy and the permissions policy, and that permissions policy cannot be attached to any other IAM entity.

For information about other services that support service-linked roles, see [AWS services that work with IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-services-that-work-with-iam.html) and look for the services that have **Yes** in the **Service-Linked Role** column. Choose a **Yes** with a link to view the service-linked role documentation for that service.

## Service-linked role permissions for Cost Optimization Hub


Cost Optimization Hub uses the service-linked role named `AWSServiceRoleForCostOptimizationHub`, which enables access to AWS services and resources used or managed by Cost Optimization Hub.

The `AWSServiceRoleForCostOptimizationHub` service-linked role trusts the `cost-optimization-hub.bcm.amazonaws.com` service to assume the role.

The role permissions policy, `CostOptimizationHubServiceRolePolicy`, allows Cost Optimization Hub to complete the following actions on the specified resources:
+ organizations:DescribeOrganization
+ organizations:ListAccounts
+ organizations:ListAWSServiceAccessForOrganization
+ organizations:ListParents
+ organizations:DescribeOrganizationalUnit
+ organizations:ListDelegatedAdministrators
+ ce:ListCostAllocationTags
+ ce:GetCostAndUsage
+ ce:GetDimensionValues

For more information, see [Allows Cost Optimization Hub to call services required to make the service work](https://docs.aws.amazon.com/cost-management/latest/userguide/billing-permissions-ref.html#cost-optimization-hub-managedIAM).

To view the full permissions details of the service-linked role `CostOptimizationHubServiceRolePolicy`, see [CostOptimizationHubServiceRolePolicy](https://docs.aws.amazon.com/aws-managed-policy/latest/reference/CostOptimizationHubServiceRolePolicy.html) in the *AWS Managed Policy Reference Guide*.

You must configure permissions to allow an IAM entity (such as a user, group, or role) to create, edit, or delete a service-linked role. For more information, see [Service-linked role permissions](https://docs.aws.amazon.com/IAM/latest/UserGuide/using-service-linked-roles.html#service-linked-role-permissions) in the *IAM User Guide*.

## Creating the Cost Optimization Hub service-linked role


You don't need to manually create a service-linked role. When you enable Cost Optimization Hub, the service automatically creates the service-linked role for you. You can enable Cost Optimization Hub through the AWS Cost Management console, or via the API or AWS CLI. For more information, see Enable Cost Optimization Hub in this user guide.

If you delete this service-linked role, and then need to create it again, you can use the same process to recreate the role in your account.

## Editing the Cost Optimization Hub service-linked role


You can't edit the name or permissions of the `AWSServiceRoleForCostOptimizationHub` service-linked role because various entities might reference the role. However, you can edit the description of the role using IAM. For more information, see [Editing a service-linked role](https://docs.aws.amazon.com/IAM/latest/UserGuide/using-service-linked-roles.html#edit-service-linked-role) in the IAM User Guide.

**To allow an IAM entity to edit the description of the `AWSServiceRoleForCostOptimizationHub` service-linked role**

Add the following statement to the permissions policy for the IAM entity that needs to edit the description of a service-linked role.

```
{
    "Effect": "Allow",
    "Action": [
        "iam:UpdateRoleDescription"
    ],
    "Resource": "arn:aws:iam::*:role/aws-service-role/cost-optimization-hub.bcm.amazonaws.com/AWSServiceRoleForCostOptimizationHub",
    "Condition": {"StringLike": {"iam:AWSServiceName": "cost-optimization-hub.bcm.amazonaws.com"}}
}
```

## Deleting the Cost Optimization Hub service-linked role


If you no longer need to use Cost Optimization Hub, we recommend that you delete the `AWSServiceRoleForCostOptimizationHub` service-linked role. That way, you don't have an unused entity that isn't actively monitored or maintained. However, before you can manually delete the service-linked role, you must opt out of Cost Optimization Hub.

**To opt out of Cost Optimization Hub**

For information about opting out of Cost Optimization Hub, see [Opting out of Cost Optimization Hub](https://docs.aws.amazon.com/cost-management/latest/userguide/coh-getting-started.html#coh-opt-out).

**To manually delete the service-linked role using IAM**

Use the IAM console, the AWS Command Line Interface (AWS CLI), or the AWS API to delete the `AWSServiceRoleForCostOptimizationHub` service-linked role. For more information, see [Deleting a Service-Linked Role](https://docs.aws.amazon.com/IAM/latest/UserGuide/using-service-linked-roles.html#delete-service-linked-role) in the *IAM User Guide*.

## Supported Regions for Cost Optimization Hub service-linked roles


Cost Optimization Hub supports using service-linked roles in all of the AWS Regions where the service is available. For more information, see AWS service endpoints.