centos7 上在主機(jī)名變更新增了一個(gè)hostnamectl 指令 ，該指令的無論在輸出和更改上都較之前更加的便利。先看下hostname的help幫助信息：
[root@361way ~]# hostnamectl --help
hostnamectl [OPTIONS...] COMMAND ...
Query or change system hostname.
-h --help Show this help
--version Show package version
--transient Only set transient hostname
--static Only set static hostname
--pretty Only set pretty hostname
-P --privileged Acquire privileges before execution
--no-ask-password Do not prompt for password
-H --host=[USER@]HOST Operate on remote host
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
查看hostname信息
[root@361way ~]# hostnamectl
Static hostname: 361way
Icon name: computer-desktop
Chassis: desktop
Machine ID: 6917731f5fe447d0bca296ed2802e250
Boot ID: e0d20bc2a3a4474c960394967d33ab53
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 3.10.0-123.6.3.el7.x86_64
Architecture: x86_64
設(shè)置主機(jī)名
從上面的help 幫助里可以看到，在設(shè)置主機(jī)名時(shí)，這里涉及到四種主機(jī)名，在hostnamectl 的man手冊(cè)里給予了說明和解釋，如下：
This tool distinguishes three different hostnames: the high-level "pretty" hostname which might include all kinds of special characters (e.g. "Lennart's
Laptop"), the static hostname which is used to initialize the kernel hostname at boot (e.g. "lennarts-laptop"), and the transient hostname which might be
assigned temporarily due to network configuration and might revert back to the static hostname if network connectivity is lost and is only temporarily
written to the kernel hostname (e.g. "dhcp-47-11").
Note that the pretty hostname has little restrictions on the characters used, while the static and transient hostnames are limited to the usually accepted
characters of Internet domain names.
更改主機(jī)名
一般情況下都是使用set-hostname進(jìn)行更改：
[root@361way ~]# hostnamectl set-hostname blog
更改主機(jī)名一般會(huì)涉及到/etc/hostname 、/etc/machine-info 兩個(gè)文件，同時(shí)對(duì)于不同的名字修改在man手冊(cè)上也給了說明：
The static hostname is stored in /etc/hostname, see hostname(5) for more information. The pretty hostname, chassis type, and icon name are stored in /etc/machine-info, see machine-id(5).
set-icon-name 設(shè)置的主機(jī)一般和圖形界面會(huì)用到，對(duì)應(yīng)的hostnamectl 輸出中的Icon name ，set-chassis 指定了主機(jī)的平臺(tái)類型，如本機(jī)的是desktop，還可以設(shè)置為："desktop", "laptop", "server", "tablet", "handset"
