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首先備份/etc/yum.repos.d/CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2.下載對應版本repo文件, 放入/etc/yum.repos.d/(操作前請做好相應備份)
Centos7:
wget -P /etc/yum.repos.d http://mirrors.163.com/.help/CentOS7-Base-163.repo
Centos6:
wget -P /etc/yum.repos.d http://mirrors.163.com/.help/CentOS6-Base-163.repo
Centos5:
wget -P /etc/yum.repos.d http://mirrors.163.com/.help/CentOS5-Base-163.repo
3.運行以下命令生成緩存
yum clean all
yum makecache