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