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Chapter 5. Technology previews

This section provides an overview of Technology Preview features introduced or updated in this release of Red Hat Ceph Storage.


Technology Preview features are not supported with Red Hat production service level agreements (SLAs), might not be functionally complete, and Red Hat does not recommend to use them for production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

For more information on Red Hat Technology Preview features support scope, see

5.1. Block Devices (RBD)

Erasure Coding for Ceph Block Devices

Erasure coding for Ceph Block Devices is supported as a Technology Preview. For details, see the Erasure Coding with Overwrites (Technology Preview) section in the Storage Strategies Guide for Red Hat Ceph Storage 3.

5.2. Ceph File System

Erasure Coding for Ceph File System

Erasure coding for Ceph File System is now supported as a Technology Preview. For details, see the Creating Ceph File Systems with erasure coding section in the Ceph File System Guide for Red Hat Ceph Storage 3.

5.3. Object Gateway

Improved interoperability with S3 and Swift by using a unified tenant namespace

This enhancement allows buckets to be moved between tenants. It also allows buckets to be renamed.

In Red Hat Ceph Storage 2 the rgw_keystone_implicit_tenants option only applied to Swift. As of Red Hat Ceph Storage 3 this option applies to s3 also. Sites that used this feature with Red Hat Ceph Storage 2 now have outstanding data that depends on the old behavior. To accommodate that issue this enhancement also expands rgw_keystone_implicit_tenants so it can be set to any of "none", "all", "s3", or "swift".

For more information, see Bucket management in the Object Gateway Guide for Red Hat Enterprise Linux or Object Gateway Guide for Ubuntu depending on your distribution. The rgw_keystone_implicit_tenants setting is documented in the Using Keystone to Authenticate Ceph Object Gateway Users guide.

AWS4 signature support in S3 authentication for Ceph Object Gateway when using Keystone

With this update, S3 user authentication using the new AWS4 signatures as a part of the Keystone service is supported as a Technology Preview.

The Ceph Object Gateway supports a subset of the Amazon Secure Token Service (STS) REST APIs. STS Lite is one supported API. It provides access to a set of temporary credentials for identity and access management. For more information, see Authentication using the STS Lite API (Technology Preview) in the Developer Guide.

The Beast HTTP front end

This update adds a new Ceph Object Gateway HTTP front end called Beast as a Technology Preview. The Beast front end uses the Boost.Beast library for HTTP parsing and the Boost.Asio library for asynchronous I/O.

Experimental support for delegated authorization using the Open Policy Agent (OPA)

The Open Policy Agent is a distributed policy-based authorization framework being incubated in the Cloud-Native Computing Foundation (CNCF). This feature is in development and is not to be used in a production environment.