yum uodate不能升级

gallanthunter

[root@HUNTER hunter]# yum update
载入插件: refresh-packagekit
Repository base is listed more than once in the configuration
Repository addons is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository contrib is listed more than once in the configuration
Repository updates is listed more than once in the configuration
http://centos.ustc.edu.cn/centos ... epodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found
尝试其他镜像.
错误: Cannot retrieve repository metadata (repomd.xml) for repository: addons. Please verify its path and try again
[root@HUNTER hunter]#

请问用yum升级时出现如下的错误如何处理？

gallanthunter

谢谢各位！

gallanthunter

yum clean all
yum -y update