问题描述：
mount: wrong fs type, bad option, bad superblock on x.x.x.x:/xxxx_domain/update,
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
提示很明确，缺少mount.nfs //此命令源自nfs-utils
问题解决：
yum install -y nfs-utils
service rpcbind start && chkconfig rpcbind on
问题测试：
mount -t nfs 10.10.10.1:/update /mnt