1.修改文件vi /etc/sysconfig/network下的hostname,如：

NETWORKING=yes

HOSTNAME=master

2.修改文件：vi /etc/hosts

127.0.0.1   master localhost

::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

~ 

3.重启reboot

4.验证，输入命令 hostname

输出：master

5.配置ip和主机名映射关系表

vi /etc/hosts下添加

192.168.28.130 master

192.168.28.136 slave1

192.168.28.137 slave2

redhat修复hostname主机名