CentOS 7.8 yum update 更新，报 404

[malaohu]

mkdir ~/bak/
cp -r /etc/yum.repos.d/* ~/bak/

# https://mirrors.tuna.tsinghua.edu.cn/centos-vault/7.8.2003/

cd /etc/yum.repos.d

minorver=7.8.2003
sudo sed -e "s|^mirrorlist=|#mirrorlist=|g" \
         -e "s|^#baseurl=http://mirror.centos.org/centos/\$releasever|baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-vault/$minorver|g" \
         -i.bak \
         /etc/yum.repos.d/CentOS-*.repo


yum makecache