RHEL8新特性

RHEL 8新特性

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8-beta/html-single/8.0_beta_release_notes/index

Note: There is no CentOS 8 beta. CentOS 8 will be available after the final RHEL 8 release.

Improvements and new features in RHEL 8

Distribution

• Based on Fedora 28 and the upstream kernel 4.18

Repositories

• BaseOS
• Application Stream (AppStream)

yum install @:
yum install @postgresql:9.6

Kernel

• supports 5-level page tables

57/52 bit of virtual/physical memory addressing with 128 PiB of virtual address space and 4 PB of physical memory capacity

• Control Group v2
• early kdump

/usr/share/doc/kexec-tools/early-kdump-howto.txt

Software Management

• gnome-software
• Yum 4 based on DNF

Increased performance
Support for modular content Well-designed stable API for integration with tooling

• Notable RPM features
  • The debuginfo packages can be installed in parallel
  • Support for packaging files above 4 GB in size
  • Support for weak dependencies

Infrastructure services

• tuned-adm
• syspurpose show
• Geolite2 Databases
  • geoipupdate

Shells and command-line tools

• nobody & nfsnobody merged into nobody(65534)

This change reduces the confusion about files that are owned by nobody but have nothing to do with NFS.

Web servers, databases, dynamic languages

• Python
  • Python 3.6 (yum install python3)
  • Python 2.7 (yum install python2)
  • pathfix.py -pn -i %{__python3} PATH ...
• Ruby 2.5
• PHP 7.2
  • PHP uses FastCGI Process Manager (FPM) by default
  • /etc/php-fpm.d/*.conf
  • aspell,mysql (note that the mysqli and pdo_mysql extensions are still available, provided by php-mysqlnd package),zip,memcache have been removed
• Perl 5.26
• httpd 2.4.35
  • /etc/httpd/conf.modules.d/00-mpm.conf
• nginx 1.14
• MariaDB 10.3
• MySQL 8.0
  • mysql_native_password(default authentication plug-in)
• PostgreSQL 10
• PostgreSQL 9.6
• Redis 4.0

Desktop

• GNOME Shell 3.28
• Wayland as their default display server instead of the X.org

To disable Wayland in GDM, set the WaylandEnable=false option in the /etc/gdm/custom.conf file

Non-Blocking I/O (NIO) connector

• Non-Blocking I/O (NIO) connector(Tomcat 9.0)
• Active Directory users can now administer Identity Management
• sssctl
• yum module install idm:DL1/profile_name
• SSSD
  • /etc/nsswitch.conf
  • nscd
  • nss_sss
  • sssd-kcm
  • Session recording
• authselect

Compilers and development tools

• Boost 1.64
  • yum install boost-python3-devel
• Unicode 11.0.0
• compat-libpthread-nonshared
• compat-libgfortran-48
• glibc 2.28
• CMake 3.11
• make 4.2.1
• Go Toolset
• SystemTap 4.0
• binutils 2.30
• co-pilot 4.1.3
  • pmdaperfevent
  • pmdapostgresql
  • pmdaredis
  • pmdabcc
  • pmdammv
  • pmdagfs2
• elfutils 0.174
• Valgrind 3.14
• GDB 8.2
• GCC8.2

File systems and storage

• XFS copy-on-write data extents
• VDO supports all architectures
• BOOM boot manager simplifies the process of creating boot entries
• LUKS2(default format for encrypting volumes)
• /etc/multipath.conf(add overrides section)

High availability and clusters

• Pacemaker 2.0.0
  • pcs stonith sbd watchdog list
  • pcs resource failcount show
  • pcs resource failcount reset
  • pcs cluster setup
  • pcs cluster node add
  • pcs cluster node remove
  • pcs host auth
  • pcs cluster auth
  • pcs pcsd clear-auth
  • pcs status --full
• Corosync 3, knet, and node names. System-wide Cryptographic Policies are also included. Lightweight, open standards-based container toolkit (Buildah, Podman, Skopeo) Red Hat Enterprise Linux Web Console provides a simplified interface to more easily manage Red Hat Enterprise Linux servers locally and remotely, including virtual machines

Networking

• nftables network packet filtering framework(iptables, ip6tables, arptables, and ebtables)
  • nftrace
  • nft list
  • nft flush ruleset
• firewalld uses nftables by default
• iptables-translate and ip6tables-translate
• IPVLAN virtual network drivers
• TCP networking stack version 4.16, BBR and NV
• IKEv2

Security

• New rsyslog module: omkafka
• Audit 3.0 replaces audispd with auditd

Virtualization

• Cockpit web interface
• KVM supports 5-level paging
• KVM supports UMIP
• KVM guest crash reports
• qemu-kvm 2.12
  • Q35 guest machine type
  • UEFI guest boot
  • NUMA tuning and pinning in the guest
  • vCPU hot plug and hot unplug
  • guest I/O threading
• NVIDIA vGPU compatible with the VNC console
• Ceph is supported by virtualization
• QEMU sandboxing

RHEL8 Beta ISO file Download Link:

• Intel/AMD 64-bit                https://red.ht/2ROrd80
• IBM Power little endian     https://red.ht/2FnoQb6
• IBM z Systems                    https://red.ht/2RUif9k
• ARM 64-bit                         https://red.ht/2DmPZbn

You can download ISO file in your browser or use wget to download in terminal like below. Use -O option to specify the filename to save as.

wget https://red.ht/2ROrd80 -O rhel8-beta-x64.iso

Once it’s downloaded, you can create a bootable USB with dd command like below on a Linux desktop OS. /dev/sdXis the device name of your USB drive, which can can be obtained by running command sudo parted -l.

sudo dd if=rhel8-beta-x64.iso of=/dev/sdX status=progress

On Windows, you can create a bootable USB with Rufus. If you like to install RHEL 8 beta in VirtualBox, there’s no need to create bootable USB drive.