由於根分區容量不夠，將vsftp默認匿名用戶目錄/var/ftp/pub 軟鏈接到/sdb/yum下的yum下，結果一直導致下面錯誤
解決方法是修改/etc/vsftpd/vsftpd.conf
添加字段 anon_root=/sdb/yum ---> 將匿名用戶默認家目錄改爲現有yum源目錄
錯誤：[root@localhost ~]# yum update
Loading "security" plugin
Loading "rhnplugin" plugin
This system is not registered with RHN.
RHN support will be disabled.
debuginfo 0 B 00:00
ftp://192.168.1.105/pub/Server/repodata/repomd.xml: [Errno -1] Error importing repomd.xml for debuginfo: Damaged repomd.xml file
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: debuginfo. Please verify its path and try again
FTP用的是VSFTP。
系統：REHL 5.4
