# 阿里源
先切换到root权限用户
cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
wget -P /etc/yum.repos.d/ http://mirrors.aliyun.com/repo/epel-7.repo
yum clean all
yum makecache
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脚本解释：
# 备份原始的更新源
cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
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# 下载并设置更新源为aliyun
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
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# 下载并设置EPEL源,此源中包含更多的软件
wget -P /etc/yum.repos.d/ http://mirrors.aliyun.com/repo/epel-7.repo
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# 清理yum缓存
yum clean all
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# 创建yum缓存
yum makecache
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