yum [Errno 256] No more mirrors to try ½â¾ö·½·¨

¸Õ²Å°²×°smbʱÓöµ½ÎÊÌâyum [Errno 256] No more mirrors to try ½â¾ö·½·¨：

ϵͳÐÅÏ¢：CentOS release 6.6 (Final)

1.yum clean all
2.yum makecache
3.yum update