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Chapter 1. Overview of Red Hat Enterprise Linux 9.8

1.1. Major changes in RHEL 9.8
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Installer and image creation

Key highlights for RHEL image builder:

  • You can use RHEL image builder to create disk images with advanced partitioning.
  • You can customize your blueprint to enable injecting a Kickstart file when building ISO images.
  • System images created with the RHEL image builder, such as AWS or KVM formats, do not have a separate /boot partition.
  • RHEL image builder now supports WSL2 images.

Security

GnuTLS 3.8.10 introduces ML-KEM hybrid key exchange and ML-DSA post-quantum (PQ) algorithms.

RHEL 9.8 provides OpenSSH in version 9.9, which introduces many fixes and improvements over OpenSSH 8.7 in the previous RHEL version.

The p11-kit packages have been upgraded to upstream version 0.26.1, which delivers support for post-quantum cryptography (PQC) definitions in PKCS #11 headers.

The clevis-pin-trustee package provides a new Clevis pin trustee that enables automated encryption and decryption of LUKS-encrypted volumes by using remote attestation through the Trustee Key Broker Service (KBS).

The fapolicyd packages are rebased to upstream version 1.4.3, and you can now filter rules.

See New features - Security for more information.

Kernel

Review the most notable kernel updates in Red Hat Enterprise Linux 9.8.

  • Extends kernel observability with additional perf features and new Intel core, uncore, c-state, and package performance events.
  • Aligns perf and BPF tooling more closely with upstream by updating perf to recent upstream versions and enabling debuginfod support.
  • Expands uncore and core performance counters for newer Intel platforms and adds AMD IBS load-latency filtering to improve CPU and memory analysis.
  • Adds or updates drivers and device IDs for Intel EDAC, Intel QAT, and Intel/AMD accelerator and crypto devices to improve hardware coverage.
  • Improves real-time analysis and tuning by extending rtla threshold-overflow actions, adding cpupower Python bindings, and updating rteval.
  • Updates kernel debugging and crash analysis by rebasing crash and enhancing LUKS-aware kdump handling in both the kernel and kdump utilities.

Dynamic programming languages, web and database servers

Later versions of the following Application Streams are now available:

  • MariaDB 11.8
  • Node.js 24

See New features - Dynamic programming languages, web and database servers and Technology Previews - Dynamic programming languages, web and database servers for more information.

Compilers and development tools

Updated system toolchain

The following system toolchain components have been updated:

  • GCC 11.5
  • glibc 2.39
  • Annobin 12.98
  • Binutils 2.35.2
Updated performance tools and debuggers

The following performance tools and debuggers have been updated in RHEL 9.8:

  • GDB 16.3
  • Valgrind 3.26.0
  • SystemTap 5.4
  • Dyninst 13.0.0
  • elfutils 0.194
  • libabigail 2.9
Updated performance monitoring tools

The following performance monitoring tools have been updated in RHEL 9.8:

  • PCP 6.3.7
  • Grafana 10.2.6
Updated compiler toolsets

The following compiler toolsets have been updated in RHEL 9.8:

  • GCC Toolset 15

    • GCC 15.2

    • Binutils 2.44

      Note that Annobin and dwz are not provided in GCC Toolset starting with version 15.

  • LLVM Toolset 21.1.8
  • Rust Toolset 1.92.0
  • Go Toolset 1.26.2

For detailed changes, see New features - Compilers and development tools.

1.2. In-place upgrade
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In-place upgrade from RHEL 8 to RHEL 9

The supported in-place upgrade paths currently are:

  • From RHEL 8.10 to RHEL 9.6, and RHEL 9.8 on the following architectures:

    • AMD and Intel 64-bit architectures (x86-64-v2)
    • 64-bit ARM architecture (ARMv8.0-A)
    • IBM POWER 9 (little endian) and later
    • IBM Z architectures (IBM z14 or IBM LinuxONE II or later)
  • From RHEL 8.10 to RHEL 9.6, and RHEL 9.8 on systems with SAP HANA

For instructions on performing an in-place upgrade, see Upgrading from RHEL 8 to RHEL 9.

For instructions on performing an in-place upgrade on systems with SAP environments, see Upgrading SAP environments from RHEL 8 to RHEL 9.

For information regarding how Red Hat supports the in-place upgrade process, see the In-place upgrade Support Policy.

Notable enhancements and bug fixes include:

  • New Ansible roles to automate the upgrade process. For more information, see In-place upgrade phases automation with the analysis, remediate, and upgrade Ansible roles.
  • Modernization of the system storage initialization when booting to the upgrade environment.
  • Enable upgrade with JBoss Enterprise Application Platform 7.4, 8.0, and 8.1.
  • Correctly upgrade systems with configured LVM and multipath.
  • Fix the upgrade on systems with Non-Volatile Memory Express over Fibre Channel (NVMe-FC).
  • Fix broken DNF transaction execution when performing the system upgrade after the reboot leading to emergency mode.
  • Fix the upgrade on systems with the kernel-rt package.

In-place upgrade from RHEL 7 to RHEL 9

It is not possible to perform an in-place upgrade directly from RHEL 7 to RHEL 9. However, you can perform an in-place upgrade from RHEL 7 to RHEL 8 and then perform a second in-place upgrade to RHEL 9. For more information, see In-place upgrades over multiple RHEL major versions by using Leapp.

1.3. Red Hat Customer Portal Labs
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Red Hat Customer Portal Labs is a set of tools in a section of the Customer Portal available at https://access.redhat.com/labs/. The applications in Red Hat Customer Portal Labs can help you improve performance, quickly troubleshoot issues, identify security problems, and quickly deploy and configure complex applications. Some of the most popular applications are:

1.4. Additional resources
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Capabilities and limits of Red Hat Enterprise Linux 9 as compared to other versions of the system are available in the Knowledgebase article Red Hat Enterprise Linux technology capabilities and limits.

Information regarding the Red Hat Enterprise Linux life cycle is provided in the Red Hat Enterprise Linux Life Cycle document.

The Package manifest document provides a package listing for RHEL 9, including licenses and application compatibility levels.

Application compatibility levels are explained in the Red Hat Enterprise Linux 9: Application Compatibility Guide document.

Major differences between RHEL 8 and RHEL 9, including removed functionality, are documented in Considerations in adopting RHEL 9.

Instructions on how to perform an in-place upgrade from RHEL 8 to RHEL 9 are provided by the document Upgrading from RHEL 8 to RHEL 9.

Using Red Hat Lightspeed you can proactively identify, examine, and resolve known technical issues. Red Hat Lightspeed is included with all RHEL subscriptions. For instructions on how to install the client and register your system to the service, see the Red Hat Lightspeed documentation page.

Note

Public release notes include links to access the original tracking tickets, but private release notes are not viewable so do not include links.[1]


[1] Public release notes include links to access the original tracking tickets, but private release notes are not viewable so do not include links.
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