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163yum源:http://mirrors.163.com/.help/centos.html
1、首先备份/etc/yum.repos.d/CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2、下载对应版本repo文件, 放入/etc/yum.repos.d/(操作前请做好相应备份)
CentOS7
CentOS6
CentOS5
3、运行以下命令生成缓存
yum clean all
yum makecache