rocky linux自带的YUM源需要替换为mirrors.ustc.edu.cn，否则很慢

wang918918

sed -e 's|^mirrorlist=|#mirrorlist=|g'    -e 's|^#baseurl=http://dl.rockylinux.org/$contentdir|baseurl=https://mirrors.ustc.edu.cn/rocky|g'    -i.bak    /etc/yum.repos.d/Rocky-AppStream.repo   /etc/yum.repos.d/Rocky-BaseOS.repo    /etc/yum.repos.d/Rocky-Extras.repo    /etc/yum.repos.d/Rocky-PowerTools.repo