错误如下：
mount: wrong fs type, bad option, bad superblock on 192.168.1.7:data/nfsdir2,
missing codepage or helper program, or other error
(for several filesystems (e.g. nfs, cifs) you might
need a /sbin/mount.<type> helper program)
In some cases useful info is found in syslog - try
dmesg | tail or so.
解决办法：
Centos ：
yum install nfs-utils
Ubuntu：
sudo apt-get install nfs-common