CentOS 8已被放棄，將在2021年底停止支持，停止后可以遷移到Stream滾動發行版，來獲取更新。
CentOS 8遷移至Stream版本的命令行如下：
# 老方法 dnf install centos-release-stream 不再推薦使用
dnf swap centos-linux-repos centos-stream-repos
dnf distro-sync
cat /etc/centos-release
CentOS Stream release 8
參考：
https://www.centos.org/centos-stream/ https://centos.org/distro-faq/
CentOS Stream 遷移后還原回 CentOS 8 ：
https://forums.rockylinux.org/t/centos-8-centos-stream-rocky-linux/2343/5
https://unix.stackexchange.com/questions/624494/how-to-switch-to-centos-8-from-centos-stream
可替換CentOS的發行版匯總： https://www.cnblogs.com/wswind/p/14630346.html