本篇文章仅以配置阿里云源为例，如需配置其他源可将地址替换为其它源，如清华：mirrors.tuna.tsinghua.edu.cn
一、CentOS 7 yum源
rm -rf /etc/yum.repos.d/*.repo #删除repo文件，或者自己备份 curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo yum makecache #更新缓存
二、CentOS 6 yum源
rm -rf /etc/yum.repos.d/*.repo #删除repo文件，或者自己备份 curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo yum makecache #更新缓存
三、Ubuntu 18 apt源
mv /etc/apt/sources.list{,bak} #备份sources.list
cat > /etc/apt/sources.list /etc/apt/sources.list /etc/apt/sources.list /etc/apt/sources.list 
