介紹

RHEL 9 (EOL: 2032)

• File System: XFS            # 依舊
• Kernel Version: 5.14
• Compiler: GCC 11

File system

XFS now supports Direct Access (DAX) operations

NFS introduces the “eager write” mount option

Networking

The new MultiPath TCP daemon (mptcpd) to configure MultiPath TCP (MPTCP) endpoints
(without using the iproute2 utility)

network-scripts(removed), iptables-nft & ipset (deprecated)

NetworkManager

Config file 改了位置

/etc/NetworkManager/system-connections/enp0s3-nmconnection

Package

s-nail replaces mailx

ksmtuned is now distributed separately from qemu-kvm

Containers

The overlayfs support is now available from kernel 5.11

The crun container runtime is now the default runtime.

cgroup v2 (enabled by default)

Netavark stack

Virtualization

virtiofs

Default Databases

MySQL 8.0, MariaDB 10.5, PostgreSQL 13, Redis 6.2

Runtimes and tools

• GCC 11.2.1
• LLVM 13.0.1
• Python 3.9
• Perl 5.32
• Node.js 16
• PHP 8.0

Deprecated in RHEL 9

 * SCP is replaced by SFTP
 * teamd is replaced by bond

(1) 安不了 aspell

dnf install aspell-en

  - nothing provides aspell >= 12:0.60 needed by aspell-en-50:2020.12.07-7.el9.x86_64 from epel

yum repolist all | grep devel

devel    Rocky Linux 9 - Devel WARNING! FOR BUILDR disabled

yum install -y yum-utils

# yum-config-manager --enable <repo-id>

yum-config-manager --enable devel

dnf install aspell

SELinux

# SELinux running with no policy loaded

grubby --update-kernel ALL --args selinux=0

# To revert back to SELinux enabled:

grubby --update-kernel ALL --remove-args selinux