upgrad CentOS 8.5 to CentOS stream commnad dnf update dnf in centos-release-stream dnf swap centos-linux-repos centos-stream-repos     dnf in centos-release-stream   dnf swap centos-linux-repos centos-stream-repos     dnf repolist     dnf distro-sync … Enter ‘Y’ Key! …   Reboot! (재부팅) systemctl reboot   Check version! (버전 확인) cat /etc/centos-release hostnamectl