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-extras.repo \
    /etc/yum.repos.d/rocky.repo

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

dnf makecache
dnf update

# 生成缓存需要时间，可以直接显示当前可用yum源
yum clean all && yum repolist