centos7更换阿里云yum源
cd /etc/yum.repos.d
#备份
mv ./CentOS-Base.repo ./CentOS-Base.repo.bak
mv ./epel-7.repo ./epel-7.repo.bak
#获取阿里云yum源
wget http://mirrors.aliyun.com/repo/Centos-7.repo
wget https://mirrors.aliyun.com/repo/epel-7.repo
#清除缓存&更新yum源
yum clean all
yum makecache
yum update #这个可以不操作
完成
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