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Xiaobian to share with you the official release of CentOS 8 sample analysis, I hope you have something to gain after reading this article, let's discuss it together!

CentOS 8 officially released!

CentOS 8 and Red Hat Enterprise Linux 8 distributions are consistent, both based on Fedora 28 and kernel 4.18. Tools to support traditional and emerging workloads provide users with a stable, secure, consistent foundation for deployment across hybrid clouds. CentOS fully complies with Red Hat's reissue policy and strives to be fully functionally compatible with upstream products. CentOS's modifications to components were mainly to remove Red Hat's trademarks and artwork. This release also includes the brand new CentOS Streams, a rolling Linux distribution that exists between upstream development of Fedora Linux and downstream development of RHEL. You can think of CentOS Streams as a release to experience the latest Red Hat Linux features without waiting too long.

The highlights of this release include:

Distribution/Repository

CentOS 8 is distributed primarily through two repositories: 1) BaseOS 2) AppStream ;

BaseOS repository: mainly contains the core of operating system functions, provided in RPM format;

AppStream repository: mainly includes user space applications, supports new extension modules in traditional RPM format, and can install multiple versions of components;

software management

YUM package manager is based on DNF technology, has been improved in terms of performance, and supports modular content, providing stable API and other tool integration;

Shell scripts and command-line tools

RHEL 8 mainly provides version control tools: 1) Git 2.18: distributed architecture distributed control tools;2) Mercurial 4.8: lightweight distributed version control tools, able to effectively handle large projects;3) Subversion 1.10: centralized version control tools

Dynamic programming languages, Web and database servers

Python 3.6 is the default Python environment in RHEL 8, with limited support for Python 2.7;

Node.js is a new feature in RHEL. Other dynamic programming languages include PHP 7.2, Ruby 2.5, Perl 5.26, SWIG 3.0;

RHEL 8 provides database servers, including MariaDB 10.3, MySQL 8.0, PostgreSQL 10, PostgreSQL 9.6, and Redis 5.

RHEL 8 provides Apache HTTP Server 2.4 and introduces a new Web server: nginx 1.14.

Squid has been upgraded to version 4.4 and a new proxy cache server is available: Varnish Cache 6.0.

desktop

GNOME Shell has been upgraded to 3.28. These include: 1) new features in GNOME Boxes;2) a new on-screen keyboard;3) extended device support with Thunderbolt 3 integration;4) improvements to GNOME software, dconf-editor and GNOME terminal;

GNOME Session and GNOME Display Manager use Wayland as the default display server, which is still available in RHEL 7;

Installer and Image Creation

The Anaconda installer can utilize LUKS2 disk encryption and support NVDIMM devices in the installation system;

The Image Builder tool creates custom system images containing other packages, accessible through a graphical user interface, and outputs in multiple formats;

RHEL 8 supports the ability to install from DVD using the hardware management console HMC and support elements SE on IBM Z hosts;

core kernel

Extensions enable userspace to attach custom programs to various points, including: (sockets, trace points, packet reception) for receiving and processing data;

BPF is a tool for creating effective kernel tracers and manipulators;

file system and storage

LUKS2 format replaces the old LUKS1 format, dm-crypt subsystem and cryptsetup tool as the default LUKS2 encryption volume format;

security

By default, system-wide password policies are applied, mainly covering TLS, IPsec, SSH, DNSSEC and Kerberos protocols. Administrators can easily switch between different modes: default, legacy, future and fips by using this command: update-crypto-policies;

Supports smart cards and hardware security modules (for HSM) PKCS#11

network

The nftables framework replaces iptables default network packet filtering tool;

firewalld daemon uses nftables as the default backend;

IPVLAN virtual network driver that supports network connectivity for multiple containers;

eXpress Data Path (XDP), XDP for Traffic Control (tc), and Address Family eXpress Data Path (AF_XDP), available as part of Berkeley Packet Filtering (eBPF) extensions;

virtualization

Virtualization supports modern PCI Express-based computer types, automatically configures them in virtual machines created in RHEL 8, and gradually improves the functionality and compatibility of virtual appliances;

RHEL 8 Web console support for creating and managing virtual machines;QEMU emulator introduces sandbox functionality, calling

QEMU can enforce configurable restrictions on which systems to make virtual machines more secure;

Compilers and development tools

GCC compiler updated to version 8.2, supports the latest C++ language standard version, better optimizations, new code hardening techniques, improved warnings, and new hardware features.

Now, various tools for code generation, manipulation, and debugging can experimentally handle the DWARF5 debug message format;

Kernel support eBPF tracing is available for tools such as BCC, PCP and SystemTap;

glibc library upgrade to Unicode 11 support, updated Linux system calls, key improvements mainly in DNS stub resolver, additional security enhancements and performance improvements;

RHEL 8 provides OpenJDK 11, OpenJDK 8, IcedTea-Web, and different Java tools such as Ant, Maven, or Scala;

High availability and clustering

Cluster Explorer has been upgraded to version 2.0.0 with a number of bug fixes and improvements;

In RHEL 8, the pcs configuration system fully supports Corosync 3 knet, and node names;

After reading this article, I believe you have a certain understanding of "CentOS 8 official release sample analysis". If you want to know more about relevant knowledge, welcome to pay attention to the industry information channel. Thank you for reading!

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