[root@localhost ~]# vim /etc/yum.repos.d/dvd.repo
[root@localhost ~]# yum info gcc
Loaded plugins: refresh-packagekit, rhnplugin
This system is not registered with RHN.
RHN support will be disabled.
file:///iso/repodata/repomd.xml: [Errno 14] Could not open/read file:///iso/repodata/repomd.xml
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: dvd. Please verify its path and try again
麻烦看下为啥错误