请问fedora 9.0 yum更新源的问题

大家好
fedora9.0
无论什么yum命令都出现如下错误
电脑是能上外网的 如淘宝 163 qq等都正常
请问这是什么原因 每个yum命令都出现这样的
但是用git能下载东西的

[root@localhost ~]# yum update yum
Loaded plugins: refresh-packagekit
Could not retrieve mirrorlist http://mirrors.fedoraproject.org ... ora-9&arch=i386 error was
[Errno 4] IOError: <urlopen error (-2, 'Name or service not known')>
Error: Cannot retrieve repository metadata (repomd.xml) for repository: fedora. Please verify its path and try again


[root@localhost ~]# yum update
Loaded plugins: refresh-packagekit
Could not retrieve mirrorlist http://mirrors.fedoraproject.org ... ora-9&arch=i386 error was
[Errno 4] IOError: <urlopen error (-2, 'Name or service not known')>
Error: Cannot retrieve repository metadata (repomd.xml) for repository: fedora. Please verify its path and try again
[root@localhost ~]#

检查一下yum源。配置新的yum仓库