一、查看当前主机名

查看当前系统主机名

[guofen@localhost conf]$ hostname
localhost.localdomain

二、临时修改主机名

临时修改主机名  hostname 主机名;这种方式只能临时修改主机名，电脑只要重启就会失效。

三、永久修改主机名

1、entos7中可能通过hostnamectl命令来直接查看和更改主机名。下图中可以看出固定主机名和临时主机名。

2、修改主机名

hostnamectl set-hostname 主机名

[guofen@localhost conf]$ hostnamectl set-hostname mzj-hadoop-pictureeditor
==== AUTHENTICATING FOR org.freedesktop.hostname1.set-static-hostname ===
Authentication is required to set the statically configured local host name, as well as the pretty host name.
Authenticating as: root
Password: 
==== AUTHENTICATION COMPLETE ===
[guofen@localhost conf]$ 
[guofen@localhost conf]$ 
[guofen@localhost conf]$ 
[guofen@localhost conf]$ 
[guofen@localhost conf]$ 
[guofen@localhost conf]$ hostname
mzj-hadoop-pictureeditor
[guofen@localhost conf]$