在centos7中又新加了一个 hostnamectl 的命令。我们在操作系统中输入 hostnamectl --help 可以看到这个命令的信息。

[root@iz2ze8zj01sri4lezw8ibdz sysconfig]# hostnamectl --help
hostnamectl [OPTIONS...] COMMAND ...

Query or change system hostname.

  -h --help              Show this help
     --version           Show package version
     --no-ask-password   Do not prompt for password
  -H --host=[USER@]HOST  Operate on remote host
  -M --machine=CONTAINER Operate on local container
     --transient         Only set transient hostname
     --static            Only set static hostname
     --pretty            Only set pretty hostname

Commands:
  status                 Show current hostname settings
  set-hostname NAME      Set system hostname
  set-icon-name NAME     Set icon name for host
  set-chassis NAME       Set chassis type for host
  set-deployment NAME    Set deployment environment for host
  set-location NAME      Set location for host
[root@iz2ze8zj01sri4lezw8ibdz sysconfig]# 

然后我们可以根据情况选择合适的命令来更改主机名称了：

[root@iz2ze8zj01sri4lezw8ibdz sysconfig]# hostnamectl set-hostname cs

重启一下：

[root@iz2ze8zj01sri4lezw8ibdz sysconfig]# reboot
Last login: Mon Oct  9 21:05:23 2017 from 27.189.204.152

Welcome to Alibaba Cloud Elastic Compute Service !

[root@cs ~]# 

就OK啦！！！