Manage permissions to restore an Azure Cosmos DB account

Artikkel
10/21/2024

APPLIES TO: NoSQL MongoDB Gremlin Table

Azure Cosmos DB allows you to isolate and restrict the restore permissions for continuous backup account to a specific role or a principal. These permissions can be applied at the subscription scope or more granularly at the source account scope as shown in the following image:

List of roles required to perform restore operation.

Scope is a set of resources that have access, to learn more on scopes, see the Azure RBAC documentation. In Azure Cosmos DB, applicable scopes are the source subscription and database account for most of the use cases. The principal performing the restore actions should have write permissions to the destination resource group.

Assign roles for restore using the Azure portal

To perform a restore, a user or a principal need the permission to restore (that is restore/action permission), and permission to provision a new account (that is write permission). To grant these permissions, the owner of the subscription can assign the CosmosRestoreOperator and Cosmos DB Operator built in roles to a principal.

Sign in to the Azure portal and navigate to your subscription. The CosmosRestoreOperator role is available at subscription level.
Select Access control (IAM).
Select Add > Add role assignment to open the Add role assignment page.
Assign the following role. For detailed steps, see Assign Azure roles using the Azure portal.

Setting Value

Role CosmosRestoreOperator

Assign access to User, group, or service principal

Members <User of your choice>
Repeat step 4 with the Cosmos DB Operator role to grant the write permission. When assigning this role from the Azure portal, it grants the restore permission to the whole subscription.

Setting	Value
Role	CosmosRestoreOperator
Assign access to	User, group, or service principal
Members	<User of your choice>

Permission scopes

Scope	Example
Subscription	/subscriptions/aaaa0a0a-bb1b-cc2c-dd3d-eeeeee4e4e4e
Resource group	/subscriptions/aaaa0a0a-bb1b-cc2c-dd3d-eeeeee4e4e4e/resourceGroups/Example-cosmosdb-rg
CosmosDB restorable account resource	/subscriptions/aaaa0a0a-bb1b-cc2c-dd3d-eeeeee4e4e4e/providers/Microsoft.DocumentDB/locations/West US/restorableDatabaseAccounts/aaaa0a0a-bb1b-cc2c-dd3d-eeeeee4e4e4e

The restorable account resource can be extracted from the output of the az cosmosdb restorable-database-account list --account-name <accountname> command in CLI or Get-AzCosmosDBRestorableDatabaseAccount -DatabaseAccountName <accountname> cmdlet in PowerShell. The name attribute in the output represents the instanceID of the restorable account.

Permissions on the source account

Following permissions are required to perform the different activities pertaining to restore for continuous backup mode accounts:

Note

Permission can be assigned to restorable database account at account scope or subscription scope. Assigning permissions at resource group scope is not supported.

Permission	Impact	Minimum scope	Maximum scope
`Microsoft.Resources/deployments/validate/action`, `Microsoft.Resources/deployments/write`	These permissions are required for the ARM template deployment to create the restored account. See the sample permission RestorableAction below for how to set this role.	Not applicable	Not applicable
`Microsoft.DocumentDB/databaseAccounts/write`	This permission is required to restore an account into a resource group	Resource group under which the restored account is created.	Subscription under which the restored account is created
`Microsoft.DocumentDB/locations/restorableDatabaseAccounts/restore/action` You can't choose resource group as the permission scope.	This permission is required on the source restorable database account scope to allow restore actions to be performed on it.	The RestorableDatabaseAccount resource belonging to the source account being restored. This value is also given by the `ID` property of the restorable database account resource. An example of restorable account is /subscriptions/subscriptionId/providers/Microsoft.DocumentDB/locations/regionName/restorableDatabaseAccounts/<guid-instanceid>	The subscription containing the restorable database account.
`Microsoft.DocumentDB/locations/restorableDatabaseAccounts/read` You can't choose resource group as the permission scope.	This permission is required on the source restorable database account scope to list the database accounts that can be restored.	The RestorableDatabaseAccount resource belonging to the source account being restored. This value is also given by the `ID` property of the restorable database account resource. An example of restorable account is /subscriptions/subscriptionId/providers/Microsoft.DocumentDB/locations/regionName/restorableDatabaseAccounts/<guid-instanceid>	The subscription containing the restorable database account.
`Microsoft.DocumentDB/locations/restorableDatabaseAccounts/*/read` You can't choose resource group as the permission scope.	This permission is required on the source restorable account scope to allow reading of restorable resources such as list of databases and containers for a restorable account.	The RestorableDatabaseAccount resource belonging to the source account being restored. This value is also given by the `ID` property of the restorable database account resource. An example of restorable account is /subscriptions/subscriptionId/providers/Microsoft.DocumentDB/locations/regionName/restorableDatabaseAccounts/<guid-instanceid>	The subscription containing the restorable database account.

Permissions on the destination account

Following permissions are required to perform the different activities pertaining to restore for continuous backup mode accounts:

Permission	Impact
`Microsoft.Resources/deployments/validate/action`, `Microsoft.Resources/deployments/write`	These permissions are required for the ARM template deployment to create the restored account. See the sample permission RestorableAction below for how to set this role.
`Microsoft.DocumentDB/databaseAccounts/write`	This permission is required to restore an account into a resource group

Azure CLI role assignment scenarios to restore at different scopes

Roles with permission can be assigned to different scopes to achieve granular control on who can perform the restore operation within a subscription or a given account.

Assign capability to restore from any restorable account in a subscription

Assign the CosmosRestoreOperator built in role to the specific subscription level

az role assignment create --role "CosmosRestoreOperator" --assignee <email> --scope /subscriptions/<subscriptionId>

Assign capability to restore from a specific account

Assign a user write action on the specific resource group. This action is required to create a new account in the resource group.
Assign the CosmosRestoreOperator built in role to the specific restorable database account that needs to be restored. In the following command, the scope for the RestorableDatabaseAccount is extracted from the ID property of result of execution of az cosmosdb restorable-database-account list(if using CLI) or Get-AzCosmosDBRestorableDatabaseAccount(if using the PowerShell)

az role assignment create --role "CosmosRestoreOperator" --assignee <email> --scope  <RestorableDatabaseAccount>

Assign capability to restore from any source account in a resource group.

This operation is currently not supported.

Custom role creation for restore action with CLI

The subscription owner can provide the permission to restore to any other Microsoft Entra identity. The restore permission is based on the action: Microsoft.DocumentDB/locations/restorableDatabaseAccounts/restore/action, and it should be included in their restore permission. There is a built-in role called CosmosRestoreOperator that has this role included. You can either assign the permission using this built-in role or create a custom role.

The RestorableAction below represents a custom role. You have to explicitly create this role. The following JSON template creates a custom role RestorableAction with restore permission:

{
  "assignableScopes": [
    "/subscriptions/bbbb1b1b-cc2c-dd3d-ee4e-ffffff5f5f5f"
  ],
  "description": "Can do a restore request for any Azure Cosmos DB database account with continuous backup",
  "permissions": [
    {
      "actions": [
        "Microsoft.Resources/deployments/validate/action",
        "Microsoft.DocumentDB/databaseAccounts/write",
        "Microsoft.Resources/deployments/write",  
        "Microsoft.DocumentDB/locations/restorableDatabaseAccounts/restore/action",
        "Microsoft.DocumentDB/locations/restorableDatabaseAccounts/read",
        "Microsoft.DocumentDB/locations/restorableDatabaseAccounts/*/read"
        ],
        "dataActions": [],
        "notActions": [],
        "notDataActions": []
      }
    ],
    "Name": "RestorableAction",
    "roleType": "CustomRole"
}

Next use the following template deployment command to create a role with restore permission using ARM template:

az role definition create --role-definition <JSON_Role_Definition_Path>

Next steps

Provision continuous backup using the Azure portal, PowerShell, CLI, or Azure Resource Manager.
Get the latest restorable timestamp for SQL and MongoDB accounts.
Restore an account using the Azure portal, PowerShell, CLI, or Azure Resource Manager.
Migrate to an account from periodic backup to continuous backup.
Resource model of continuous backup mode

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