公网环境快速设置yum源

# 备份
cat <<EOF | sudo tee setup_yum.sh

cd /etc/yum.repos.d/ && mkdir repo_backup && mv *.repo repo_backup/

# 下载阿里源（以CentOS7为例）
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
wget -O /etc/yum.repos.d/epel.repo https://mirrors.aliyun.com/repo/epel-7.repo


# 更新缓存
yum clean all && yum makecache

EOF

sh setup_yum.sh