Page 20 - RHEL8 BOOK

Kernel

While RHEL 7 support maximum of 64TB of physical memory, RHEL 8 support up to 4PB of physical
memory.

The sosreport can now report any loaded eBPF (extended Berkeley Packet Filtering) programs and maps
in RHEL 8

Software management

The software is now managed by the new version of YUM which is based on DNF in Fedora. This new
version has similar syntax and compatible with the previous version YUM v3 (RHEL 7).

The new version provides increased performance, support for modular content and stable APU for
integration with tooling.

On RHEL 7, RPM utility verifies payload content of individual files while unpacking which leads to
serious issues as if the payload is damaged, it is only validated after executing script actions, which are
irreversible.

On RHEL 8, RPM command validates the entire package before installation using the hash.

Infrastructure services
Geolite2 databases now replace Geolite databases in RHEL 8.

Shells and command-line tools
The user nobody replaces nfsnobody with the user and group ID of 65534 in RHEL 8 by merging nobody
(ID 99) and nfsnobody (ID 65534) of RHEL 7.

Web servers, databases, dynamic languages
MySQL 8.0, MariaDB 10.3, PostgreSQL 10 & 9.6 and Redis 4.0 are included in RHEL 8.

Now, in RHEL 8, Nginx 1.14 is available through the base repository. Nginx was previously obtained via
Software Collection.

RHEL 8 is distributed with Python 3.6 and PHP 7.2. Python 2.7 is also available in the python2 package.

Desktop

RHEL 8 comes with GNOME v3.28 with some enhancements such as an on-screen keyboard, GNOME
boxes features, extended device support.

GNOME uses Wayland as their default display server instead of the Xorg server.

Though Wayland provides multiple advantages over X.org, there are few features currently not available
in RHEL 8.

File systems and storage
The XFS file system supports shared copy-on-write data extend functionality. This is similar to copy-on-
write (COW) functionality on other file systems which enables two or more files to share a common set

S. Pradhan
(MCA, MBA-IT, BCA, CCNA, MCSA 2012, RHCE, ETHICAL HACKING)
Email Id:-spradhan.iiht@gmail.com
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