Centos8 stream如何升级为Centos9 stream

1.输入该命令按回车键：dnf -y install epel-release

2.输入该命令按回车键：dnf -y update

3.输入该命令按回车键：dnf -y install rpmconf yum-utils

4.输入该命令按回车键：rpmconf -a，若出现提示输入Y按回车键

5.输入该命令按回车键：dnf -y remove rpmconf yum-utils epel-release

6.输入该命令按回车键：

rpm -e --nodeps `rpm -qa|grep centos`

7.输入该命令按回车键：

rpm -ivh --nodeps --force https://mirrors.aliyun.com/centos-stream/9-stream/BaseOS/x86_64/os/Packages/centos-stream-release-9.0-12.el9.noarch.rpm，

8.输入该命令按回车键：

rpm -ivh --nodeps --force https://mirrors.aliyun.com/centos-stream/9-stream/BaseOS/x86_64/os/Packages/centos-gpg-keys-9.0-12.el9.noarch.rpm

9.输入该命令按回车键：

rpm -ivh --nodeps --force https://mirrors.aliyun.com/centos-stream/9-stream/BaseOS/x86_64/os/Packages/centos-stream-repos-9.0-12.el9.noarch.rpm，

10.输入该命令按回车键：dnf clean all

11.输入该命令按回车键：

dnf -y --releasever=9 --allowerasing --setopt=deltarpm=false distro-sync

12.输入该命令按回车键：rpm --rebuilddb

13.输入该命令按回车键：

rpm -e --nodeps `rpm -qa|grep -i kernel`

14.输入该命令按回车键：dnf -y install kernel

15.输入该命令按回车键：dnf -y install kernel-core

16.输入该命令按回车键：dnf -y install shim

17.输入该命令按回车键：dnf group install minimal-environment -y

18.输入该命令按回车键：dnf -y install epel-release

19.输入该命令按回车键：dnf -y install rpmconf yum-utils

20.输入该命令按回车键：dnf -y update

21.输入该命令按回车键：rpmconf -a，若出现提示输入Y按回车键

22.输入该命令按回车键：grub2-mkconfig -o /boot/grub2/grub.cfg

23.输入该命令按回车键：grub2-install /dev/sda

24.输入该命令按回车键：echo "PermitRootLogin yes" >> /etc/ssh/sshd_config

25.输入该命令按回车键重启后再操作连接：reboot

26.输入该命令按回车键查看版本：cat /etc/redhat-release