Centos6.8无法使用

ssh连接之后键入指令:sed -i "s|enabled=1|enabled=0|g" /etc/yum/pluginconf.d/fastestmirror.conf;mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup;curl -o /etc/yum.repos.d/CentOS-Base.repo http://kangle.us/Centos-6-Vault-Aliyun.repo;yum clean all;yum makecache;yum -y update nss