转载自http://www.blogjava.net/zhyiwww/archive/2010/01/28/311136.html
比如我的计算机名称是XXX-TTT,我想修改成YYY-ZZZ
修改有两步：
[1]修改/etc/hosts
127.0.0.1 localhost
192.168.76.21 YYY-ZZZ
# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
~
~
~
[2]修改/etc/hostname
内容为
YYY-ZZZ
保存，退出，重启，就可以了。