Chapter 1. Overview Red Hat Enterprise Linux 8 | Red Hat Customer Portal (2024)

Red Hat Training

A Red Hat training course is available for RHEL 8

Based on Fedora 28 and the upstream kernel 4.18, Red Hat Enterprise Linux 8.0 provides users with a stable, secure, consistent foundation across hybrid cloud deployments with the tools needed to support traditional and emerging workloads. Highlights of the release include:

Distribution

Content is available through the BaseOS and Application Stream (AppStream) repositories.
The AppStream repository supports a new extension of the traditional RPM format - modules. This allows for multiple major versions of a component to be available for install.

See Chapter3, Distribution of content in RHEL 8 for more information.

Software Management

The YUM package manager is now based on the DNF technology and it provides support for modular content, increased performance, and a well-designed stable API for integration with tooling.

See Section5.1.4, “Software management” for more details.

Shells and command-line tools

RHEL 8 provides the following version control systems: Git 2.18, Mercurial 4.8, and Subversion 1.10.

Dynamic programming languages, web and database servers

Python 3.6 is the default Python implementation in RHEL 8; limited support for Python 2.7 is provided. No version of Python is installed by default.
Node.js is new in RHEL. Other dynamic programming languages have been updated since RHEL 7: PHP 7.2, Ruby 2.5, Perl 5.26, SWIG 3.0 are now available.
The following database servers are distributed with RHEL 8: MariaDB 10.3, MySQL 8.0, PostgreSQL 10, PostgreSQL 9.6, and Redis 5.
RHEL 8 provides the Apache HTTP Server 2.4 and introduces a new web server, nginx 1.14.
Squid has been updated to version 4.4, and a new proxy caching server is now included: Varnish Cache 6.0.

See Section5.1.7, “Dynamic programming languages, web and database servers” for more information.

Desktop

GNOME Shell has been rebased to version 3.28.
The GNOME session and the GNOME Display Manager use Wayland as their default display server. The X.Org server, which is the default display server in RHEL 7, is available as well.

See Section5.1.8, “Desktop” for more information.

Installer and image creation

The Anaconda installer can utilize LUKS2 disk encryption, and install the system on NVDIMM devices.
The Image Builder tool enables users to create customized system images in a variety of formats, including images prepared for deployment on clouds of various providers.
Installation from a DVD using Hardware Management Console (HMC) and Support Element (SE) on IBM Z are available in RHEL 8.

See Section5.1.2, “Installer and image creation” for further details.

Kernel

The extended Berkeley Packet Filtering (eBPF) feature enables the user space to attach custom programs onto a variety of points (sockets, trace points, packet reception) to receive and process data. This feature is available as a Technology Preview.
BPF Compiler Collection (BCC), a tool for creating efficient kernel tracing and manipulation programs, is available as a Technology Preview.

See Section5.3.1, “Kernel” for more information.

File systems and storage

The LUKS version 2 (LUKS2) format replaces the legacy LUKS (LUKS1) format. The dm-crypt subsystem and the cryptsetup tool now uses LUKS2 as the default format for encrypted volumes.

See Section5.1.12, “File systems and storage” for more information.

Security

System-wide cryptographic policies, which configures the core cryptographic subsystems, covering the TLS, IPsec, SSH, DNSSEC, and Kerberos protocols, are applied by default. With the new update-crypto-policies command, the administrator can easily switch between modes: default, legacy, future, and fips.
Support for smart cards and Hardware Security Modules (HSM) with PKCS #11 is now consistent across the system.

See Section5.1.15, “Security” for more information.

Networking

The nftables framework replaces iptables in the role of the default network packet filtering facility.
The firewalld daemon now uses nftables as its default backend.
Support for IPVLAN virtual network drivers that enable the network connectivity for multiple containers has been introduced.
The eXpress Data Path (XDP), XDP for Traffic Control (tc), and Address Family eXpress Data Path (AF_XDP), as parts of the extended Berkeley Packet Filtering (eBPF) feature, are available as Technology Previews. For more details, see Section5.3.7, “Networking” in Technology Previews.

See Section5.1.14, “Networking” in New features for additional features.

Virtualization

A more modern PCI Express-based machine type (Q35) is now supported and automatically configured in virtual machines created in RHEL 8. This provides a variety of improvements in features and compatibility of virtual devices.
Virtual machines can now be created and managed using the RHEL 8 web console, also known as co*ckpit.
The QEMU emulator introduces the sandboxing feature, which provides configurable limitations to what systems calls QEMU can perform, and thus makes virtual machines more secure.

See Section5.1.16, “Virtualization” for more information.

Compilers and development tools

The GCC compiler based on version 8.2 brings support for more recent C++ language standard versions, better optimizations, new code hardening techniques, improved warnings, and new hardware features.
Various tools for code generation, manipulation, and debugging can now experimentally handle the DWARF5 debugging information format.
Kernel support for eBPF tracing is available for some tools, such as BCC, PCP, and SystemTap.
The glibc libraries based on version 2.28 add support for Unicode 11, newer Linux system calls, key improvements in the DNS stub resolver, additional security hardening, and improved performance.
RHEL 8 provides OpenJDK 11, OpenJDK 8, IcedTea-Web, and various Java tools, such as Ant, Maven, or Scala.

See Section5.1.11, “Compilers and development tools” for additional details.

High availability and clusters

The Pacemaker cluster resource manager has been upgraded to upstream version 2.0.0, which provides a number of bug fixes and enhancements.
In RHEL 8, the pcs configuration system fully supports Corosync 3, knet, and node names.

See Section5.1.13, “High availability and clusters” for more information.

Additional resources

Capabilities and limits of Red Hat Enterprise Linux 8 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 8.
Major differences between RHEL 7 and RHEL 8 are documented in Considerations in adopting RHEL 8.
Instructions on how to perform an in-place upgrade from RHEL 7 to RHEL 8 are provided by the document Upgrading from RHEL 7 to RHEL 8.
Crrently supported upgrade paths are listed in Supported in-place upgrade paths for Red Hat Enterprise Linux.
The Red Hat Insights service, which enables you to proactively identify, examine, and resolve known technical issues, is now available with all RHEL subscriptions. For instructions on how to install the Red Hat Insights client and register your system to the service, see the Red Hat Insights Get Started page.

Red Hat Customer Portal Labs

RedHat 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 RedHat 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:

Registration Assistant
Kickstart Generator
Product Life Cycle Checker
RedHat Product Certificates
RedHat Satellite Upgrade Helper
Red Hat CVE Checker
JVM Options Configuration Tool
Load Balancer Configuration Tool
RedHat Code Browser
Yum Repository Configuration Helper