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Customer Key Management with Azure Key Vault

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  • Prerequisites
  • Procedure
  • Alerts
  • Related Topics
Note
Feature unavailable in Free and Shared-Tier Clusters

This feature is not available for M0 free clusters, M2, and M5 clusters. To learn more about which features are unavailable, see Atlas M0 (Free Cluster), M2, and M5 Limitations.

Important
Serverless Instances are in Preview

Serverless instances are in preview and do not support this feature at this time. To learn more, see Serverless Instance Limitations.

Atlas uses your Azure Key Identifier (AKI) from your Azure Key Vault (AKV) to encrypt and decrypt your MongoDB master keys. These MongoDB master keys are used to encrypt cluster database files and cloud providers snapshots.

When you use your own cloud provider KMS, Atlas automatically rotates the MongoDB master keys every 90 days. These keys are rotated on a rolling basis and the process does not require the data to be rewritten.

Atlas encrypts your data at rest using encrypted storage media. Using keys you manage with AKV, Atlas encrypts your data a second time when it writes it to the MongoDB encrypted storage engine. You use your AKI to encrypt the MongoDB master encryption keys.

This page covers configuring customer key management using AKV on your Atlas project.

You must configure customer key management for the Atlas project before enabling it on clusters in that project.

To enable customer-managed keys with Azure Key Vault for a MongoDB project, you must:

  • Have the Tenant ID (or Directory ID) for an Active Directory tenant.
  • Have the Client ID (or Application ID) and a non-expired application Password for an Azure Application associated to the Active Directory tenant.
  • Have the Resource Group name of an Azure Resource Group containing the Key Vault.
  • Have an Active Directory Application with the role of Azure key Vault Reader (Preview) assigned to it.
  • Have the Subscription ID and Key Vault Name of an Azure Key Vault. Ensure the Key Vault resource group matches the resource group name specified to Resource Group.

    The Key Vault must have the following Access Policies:

    • Key Management Operations

      • GET
      • LIST
    • Cryptographic Operations

      • ENCRYPT
      • DECRYPT
  • Have the Key Identifier for a key in the specified Azure Key Vault.

    Atlas uses these resources when enabling encryption at rest for a cluster in the Atlas project. Consider creating an Azure Application, Resource Group, and Key Vault specifically for use with the Atlas project.

    To learn how to configure the referenced Azure components, see the Azure Documentation.

  • To help users easily create or change a cluster, you can allow public access to the key. To narrow the scope of the key and mitigate risks, use controls such as TLS and authentication.
  • For restricted access to defined IP ranges, allow access from Atlas IP addresses and the public IP addresses of your cluster nodes. Ensure Atlas can communicate with your key vault. To avoid connectivity interruptions, update your configuration whenever node IP addresses change.

    • If you restrict access to the key vault, you create more complexity when IP addresses change. For example, when you create or update a cluster, you must grant access in the Azure Key Vault to any new IP addresses. You should implement a process to remove IP addresses and keys when you delete a cluster or remove nodes.

You must enable customer key management for a project before you can enable it on a cluster in that project.

1
  1. If it is not already displayed, select the organization that contains your desired project from the Organizations menu in the navigation bar.
  2. If it is not already displayed, select your desired project from the Projects menu in the navigation bar.
  3. Click Advanced in the sidebar.
2
3
4
Client ID
Enter the Client ID (or Application ID) of the Azure application.
Tenant ID
Enter the Tenant ID (or Directory ID) of the Active Directory tenant.
Secret
Enter one of the application's non-expired Passwords.
Azure Environment
Select the Azure cloud your Active Directory tenant lives in.
5
Subscription ID
Enter the Subscription ID of the Key Vault.
Resource Group Name
Enter the Resource Group of the Key Vault.
Key Vault Name
Enter the name of the Key Vault.
6
Key Identifier

Enter the full URL for the key created in the Key Vault.

Important

The key identifier must be provided in the full Azure general format

https://{keyvault-name}.vault.azure.net/{object-type}/{object-name}/{object-version}
7

Atlas displays a banner in the Atlas console during the encryption process.

After you Enable Customer-Managed Keys for a Project, you must enable customer key management for each Atlas cluster that contains data that you want to encrypt.

Note

You must have the Project Owner role to enable customer key management for clusters in that project.

For new clusters, toggle the Manage your own encryption keys setting to Yes when you create the cluster.

For existing clusters:

1
  1. If it is not already displayed, select the organization that contains your desired project from the Organizations menu in the navigation bar.
  2. If it is not already displayed, select your desired project from the Projects menu in the navigation bar.
  3. If the Database Deployments page is not already displayed, click Databases in the sidebar.
2

For the cluster that contains data that you want to encrypt, click the ellipses ..., then select Edit Configuration.

3
  1. Expand the Additional Settings panel.
  2. Toggle the Manage your own encryption keys setting to Yes.
4
  1. Click Review Changes.
  2. Review your changes, then click Apply Changes to update your cluster.

You must disable customer key management on each cluster in a project before you can disable the feature for the project.

Important

Do not disable or delete any AKV keys that any cluster in your Atlas project uses before you have disabled customer key management within the Atlas project. If Atlas cannot access an AKV key, any data that key encrypted becomes inaccessible.

Atlas automatically creates an encryption key rotation alert once you configure customer key management for a project.

To reset this alert, Rotate your Azure Key Identifier.

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