[root@localhost ~]# yum install yum-fastestmirror -y
Could not retrieve mirrorlist [url]http://mirrorlist.centos.org/?release=5&arch=i386&repo=os[/url] error was
[Errno 4] IOError: <urlopen error (-3, '\xe5\x9f\x9f\xe5\x90\x8d\xe8\xa7\xa3\xe6\x9e\x90\xe6\x9a\x82\xe6\x97\xb6\xe5\xa4\xb1\xe8\xb4\xa5')>
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again
或
[root@localhost ~]# yum -y install wget   （注：在下载wget命令并安装)
Could not retrieve mirrorlist [url]http://mirrorlist.centos.org/?release=5&arch=i386&repo=os[/url] error was
[Errno 4] IOError: <urlopen error (-3, '\xe5\x9f\x9f\xe5\x90\x8d\xe8\xa7\xa3\xe6\x9e\x90\xe6\x9a\x82\xe6\x97\xb6\xe5\xa4\xb1\xe8\xb4\xa5')>
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again
 
不管是用上面还是用下面那命令都会出现那错误
原因：没有配置resolv.conf
解决方法:
到/etc目录下配置resolv.conf加入nameserver IP
保存再次运行上面命令就可以。