CentOS 7 yum加速

cd /etc/yum.repos.d/
mkdir bak
mv CentOS-Base.repo ./bak/
wget http://mirrors.163.com/.help/CentOS7-Base-163.repo

yum install epel-release
sed -e 's!^metalink=!#metalink=!g' \
    -e 's!^#baseurl=!baseurl=!g' \
    -e 's!http://download\.fedoraproject\.org/pub/epel!https://mirrors.tuna.tsinghua.edu.cn/epel!g' \
    -e 's!http://download\.example/pub/epel!https://mirrors.tuna.tsinghua.edu.cn/epel!g' \
    -i /etc/yum.repos.d/epel*.repo