将源文件备份
[base] name=CentOS-$releasever - Base failovermethod=priority baseurl=http://vault.centos.org/5.11/os/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-5 http://mirrors.aliyuncs.com/centos/RPM-GPG-KEY-CentOS-5 #released updates [updates] name=CentOS-$releasever - Updates failovermethod=priority baseurl=http://vault.centos.org/5.11/updates/$basearch/ http://mirrors.aliyuncs.com/centos/$releasever/updates/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-5 http://mirrors.aliyuncs.com/centos/RPM-GPG-KEY-CentOS-5 #additional packages that may be useful [extras] name=CentOS-$releasever - Extras failovermethod=priority baseurl=http://vault.centos.org/5.11/extras/$basearch/ http://mirrors.aliyuncs.com/centos/$releasever/extras/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-5 http://mirrors.aliyuncs.com/centos/RPM-GPG-KEY-CentOS-5 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-$releasever - Plus failovermethod=priority baseurl=http://vault.centos.org/5.11/centosplus/$basearch/ http://mirrors.aliyuncs.com/centos/$releasever/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-5 http://mirrors.aliyuncs.com/centos/RPM-GPG-KEY-CentOS-5 #contrib - packages by Centos Users [contrib] name=CentOS-$releasever - Contrib failovermethod=priority baseurl=http://vault.centos.org/5.11/contrib/$basearch/ http://mirrors.aliyuncs.com/centos/$releasever/contrib/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-5 http://mirrors.aliyuncs.com/centos/RPM-GPG-KEY-CentOS-5