1、备份原始yum文件
mkdir-p/etc/yum.repos.d/repo _ backup mv/etc/yum.repos.d/repo _ back
[ base ] name=centos-6.6-base-mirrors.a liyun.comfailovermethod=priority base URL=http://mirrors.a liyun.com/com centos-vault/rpm-gpg-key-centos-6 [ updates ] name=centos-6.6-updates-mirrors.a liyun.comfailovermethod centos gpg check=1gpg key=http://mirrors.a liyun.com/centos-vault/rpm-gpg-key-centos-6 [额外] name=centos-6.6-extras-mirrors.a liyun.comfailovermethod=priority base URL=http://mirrors.a liyun.com/centos - centos-vault/rpm-gpg-key-centos-6 [ centos plus ] name=centos-6.6-plus-mirrors.a liyun.comfailovermethod centos-ventos gpg check=1enabled=0gpg key=http://mirrors.a liyun.com/centos-vault/rpm-gpg-key-centos-6 [ com name=centos-6.6-contrib-mirrors.a liyun.comfailovermethod=priority base URL=http://mirrors.a liyun.com/centos gpg check=1enabled=0gpg key=http://mirrors.a liyun.com/centos-vault/rpm-gpg-key-centos-63，更新yum源信息
yum clean allyum makecache