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`