[base] name=CentOS-$releasever - Base #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra baseurl=http://mirror.bjtu.edu.cn/centos/$releasever/os/$basearch/ gpgcheck=1 gpgkey=http://mirror.bjtu.edu.cn/centos/RPM-GPG-KEY-CentOS-6 #released updates [updates] name=CentOS-$releasever - Updates #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra baseurl=http://mirror.bjtu.edu.cn/centos/$releasever/updates/$basearch/ gpgcheck=1 gpgkey=http://mirror.bjtu.edu.cn/centos/RPM-GPG-KEY-CentOS-6 #additional packages that may be useful [extras] name=CentOS-$releasever - Extras #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra baseurl=http://mirror.bjtu.edu.cn/centos/$releasever/extras/$basearch/ gpgcheck=1 gpgkey=http://mirror.bjtu.edu.cn/centos/RPM-GPG-KEY-CentOS-6 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-$releasever - Plus #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra baseurl=http://mirror.bjtu.edu.cn/centos/$releasever/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirror.bjtu.edu.cn/centos/RPM-GPG-KEY-CentOS-6 #contrib - packages by Centos Users [contrib] name=CentOS-$releasever - Contrib #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib&infra=$infra baseurl=http://mirror.bjtu.edu.cn/centos/$releasever/contrib/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirror.bjtu.edu.cn/centos/RPM-GPG-KEY-CentOS-6
在/etc/yum.repos.d/CentOS-Base.repo，文件中修改，注意拷贝一份，以防万一
校验Key导入：rpm --import http://mirror.bjtu.edu.cn/centos/6.7/os/x86_64/RPM-GPG-KEY-CentOS-6
更新：yum update