Menu Close

Chapter 6. Technology Previews

This part provides a list of all Technology Previews available in Red Hat Enterprise Linux 9.

For information on Red Hat scope of support for Technology Preview features, see Technology Preview Features Support Scope.

6.1. RHEL for Edge

FDO process available as a Technology Preview

The FDO process for automatic provisioning and onboarding RHEL for Edge images is available as a Technology Preview. With that, you can build a RHEL for Edge Simplified Installer image, provision it to a RHEL for Edge image, and use the FDO (FIDO device onboarding) process to automatically provision and onboard your Edge devices, exchange data with other devices and systems connected on the networks. As a result, the FIDO device onboarding protocol performs device initialization at the manufacturing stage and then late binding to actually use the device.


6.2. Shells and command-line tools

ReaR available on the 64-bit IBM Z architecture as a Technology Preview

Basic Relax and Recover (ReaR) functionality is now available on the 64-bit IBM Z architecture as a Technology Preview. You can create a ReaR rescue image on IBM Z only in the z/VM environment. Backing up and recovering logical partitions (LPARs) has not been tested.

The only output method currently available is Initial Program Load (IPL). IPL produces a kernel and an initial ramdisk (initrd) that can be used with the zIPL bootloader.


Currently, the rescue process reformats all the DASDs (Direct Attached Storage Devices) connected to the system. Do not attempt a system recovery if there is any valuable data present on the system storage devices. This also includes the device prepared with the zIPL bootloader, ReaR kernel, and initrd that were used to boot into the rescue environment. Ensure to keep a copy.

For more information, see Using a ReaR rescue image on the 64-bit IBM Z architecture.


GIMP available as a Technology Preview in RHEL 9

GNU Image Manipulation Program (GIMP) 2.99.8 is now available in RHEL 9 as a Technology Preview. The gimp package version 2.99.8 is a pre-release version with a set of improvements, but a limited set of features and no guarantee for stability. As soon as the official GIMP 3 is released, it will be introduced into RHEL 9 as an update of this pre-release version.

In RHEL 9, you can install gimp easily as an RPM package.


6.3. Networking

WireGuard VPN is available as a Technology Preview

WireGuard, which Red Hat provides as an unsupported Technology Preview, is a high-performance VPN solution that runs in the Linux kernel. It uses modern cryptography and is easier to configure than other VPN solutions. Additionally, the small code-basis of WireGuard reduces the surface for attacks and, therefore, improves the security.

For further details, see Setting up a WireGuard VPN.


KTLS available as a Technology Preview

RHEL provides Kernel Transport Layer Security (KTLS) as a Technology Preview. KTLS handles TLS records using the symmetric encryption or decryption algorithms in the kernel for the AES-GCM cipher. KTLS also includes the interface for offloading TLS record encryption to Network Interface Controllers (NICs) that provides this functionality.


The systemd-resolved service is available as a Technology Preview

The systemd-resolved service provides name resolution to local applications. The service implements a caching and validating DNS stub resolver, an Link-Local Multicast Name Resolution (LLMNR), and Multicast DNS resolver and responder.

Note that systemd-resolved is an unsupported Technology Preview.


6.4. Kernel

The Intel data streaming accelerator driver for kernel is available as a Technology Preview

The Intel data streaming accelerator driver (IDXD) for the kernel is currently available as a Technology Preview. It is an Intel CPU integrated accelerator and includes the shared work queue with process address space ID (pasid) submission and shared virtual memory (SVM).


SGX available as a Technology Preview

Software Guard Extensions (SGX) is an Intel® technology for protecting software code and data from disclosure and modification.

The RHEL kernel partially supports SGX v1 and v1.5. The version 1 enables platforms using the Flexible Launch Control mechanism to use the SGX technology.


The Soft-iWARP driver is available as a Technology Preview

Soft-iWARP (siw) is a software, Internet Wide-area RDMA Protocol (iWARP), kernel driver for Linux. Soft-iWARP implements the iWARP protocol suite over the TCP/IP network stack. This protocol suite is fully implemented in software and does not require a specific Remote Direct Memory Access (RDMA) hardware. Soft-iWARP enables a system with a standard Ethernet adapter to connect to an iWARP adapter or to another system with already installed Soft-iWARP.


6.5. File systems and storage

DAX is now available for ext4 and XFS as a Technology Preview

In RHEL 9, the DAX file system is available as a Technology Preview. DAX provides means for an application to directly map persistent memory into its address space. To use DAX, a system must have some form of persistent memory available, usually in the form of one or more Non-Volatile Dual In-line Memory Modules (NVDIMMs), and a DAX compatible file system must be created on the NVDIMM(s). Also, the file system must be mounted with the dax mount option. Then, an mmap of a file on the dax-mounted file system results in a direct mapping of storage into the application’s address space.


Stratis is available as a Technology Preview

Stratis is a local storage manager. It provides managed file systems on top of pools of storage with additional features to the user:

  • Manage snapshots and thin provisioning
  • Automatically grow file system sizes as needed
  • Maintain file systems

To administer Stratis storage, use the stratis utility, which communicates with the stratisd background service.

Stratis is provided as a Technology Preview.

For more information, see the Stratis documentation: Setting up Stratis file systems.


NVMe-oF Discovery Service features available as a Technology Preview

The NVMe-oF Discovery Service features, defined in the Technical Proposals (TP) 8013 and 8014, are available as a Technology Preview. To preview these features, use the nvme-cli 2.0 package and attach the host to an NVMe-oF target device that implements TP-8013 or TP-8014. For more information about TP-8013 and TP-8014, see the NVM Express 2.0 Ratified TPs from the website.


6.6. Compilers and development tools

jmc-core and owasp-java-encoder available as a Technology Preview

RHEL 9 is distributed with the jmc-core and owasp-java-encoder packages as Technology Preview features.

jmc-core is a library providing core APIs for Java Development Kit (JDK) Mission Control, including libraries for parsing and writing JDK Flight Recording files, as well as libraries for Java Virtual Machine (JVM) discovery through Java Discovery Protocol (JDP).

The owasp-java-encoder package provides a collection of high-performance low-overhead contextual encoders for Java.


6.7. Identity Management

DNSSEC available as Technology Preview in IdM

Identity Management (IdM) servers with integrated DNS now implement DNS Security Extensions (DNSSEC), a set of extensions to DNS that enhance security of the DNS protocol. DNS zones hosted on IdM servers can be automatically signed using DNSSEC. The cryptographic keys are automatically generated and rotated.

Users who decide to secure their DNS zones with DNSSEC are advised to read and follow these documents:

Note that IdM servers with integrated DNS use DNSSEC to validate DNS answers obtained from other DNS servers. This might affect the availability of DNS zones that are not configured in accordance with recommended naming practices.


Identity Management JSON-RPC API available as Technology Preview

An API is available for Identity Management (IdM). To view the API, IdM also provides an API browser as a Technology Preview.

Previously, the IdM API was enhanced to enable multiple versions of API commands. These enhancements could change the behavior of a command in an incompatible way. Users are now able to continue using existing tools and scripts even if the IdM API changes. This enables:

  • Administrators to use previous or later versions of IdM on the server than on the managing client.
  • Developers can use a specific version of an IdM call, even if the IdM version changes on the server.

In all cases, the communication with the server is possible, regardless if one side uses, for example, a newer version that introduces new options for a feature.

For details on using the API, see Using the Identity Management API to Communicate with the IdM Server (TECHNOLOGY PREVIEW).


ACME implementation in RHCS available as Technology Preview

Server certificate issuance through an Automated Certificate Management Environment (ACME) responder is available for Red Hat Certificate System (RHCS). The ACME responder supports the ACME v2 protocol (RFC 8555).

Previously, users had to use the Certificate Authority (CA)'s proprietary certificate signing request (CSR) submission routines. The routines sometimes required certificate authority (CA) agents to manually review the requests and issue the certificates.

The RHCS ACME responder now provides a standard mechanism for automatic server certificate issuance and life cycle management without involving CA agents. The feature allows the RHCS CA to integrate with existing certificate issuance infrastructure to target public CAs for deployment and internal CAs for development.

Note that this Technology Preview only includes an ACME server implementation. No ACME client is shipped as part of this release. Additionally, this ACME preview does not retain issuance data or handle user registration.

Be aware that future RHEL updates can potentially break ACME installations.

For more information, see the IETF definition of ACME and Installing ACME Responder on GitHub.


6.8. The web console

Stratis available as a Technology Preview in the RHEL web console

With this update, the Red Hat Enterprise Linux web console provides the ability to manage Stratis storage as a Technology Preview.

To learn more about Stratis, see What is Stratis.


6.9. Virtualization

AMD SEV and SEV-ES for KVM virtual machines

As a Technology Preview, RHEL 9 provides the Secure Encrypted Virtualization (SEV) feature for AMD EPYC host machines that use the KVM hypervisor. If enabled on a virtual machine (VM), SEV encrypts the VM’s memory to protect the VM from access by the host. This increases the security of the VM.

In addition, the enhanced Encrypted State version of SEV (SEV-ES) is also provided as Technology Preview. SEV-ES encrypts all CPU register contents when a VM stops running. This prevents the host from modifying the VM’s CPU registers or reading any information from them.

Note that SEV and SEV-ES work only on the 2nd generation of AMD EPYC CPUs (codenamed Rome) or later. Also note that RHEL 9 includes SEV and SEV-ES encryption, but not the SEV and SEV-ES security attestation.


Virtualization is now available on ARM 64

As a Technology Preview, it is now possible to create KVM virtual machines on systems using ARM 64 CPUs.


virtio-mem is now available on AMD64 and Intel 64

As a Technology Preview, RHEL 9 introduces the virtio-mem feature on AMD64 and Intel 64 systems. Using virtio-mem makes it possible to dynamically add or remove host memory in virtual machines (VMs).

To use virtio-mem, define virtio-mem memory devices in the XML configuration of a VM and use the virsh update-memory-device command to request memory device size changes while the VM is running. To see the current memory size exposed by such memory devices to a running VM, view the XML configuration of the VM.