（一）CentOS6.5版本的修改主机名的方法
通过hostname 主机名 但已重启就会恢复到原先的。不过可以采用以下的进行更改既可。
1，通过修改文件/etc/sysconfig/network . eg:
# cat /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=Server34 ---->修改想要的名字
2，修改文件/etc/hosts
127.0.0.1 localhost Server34 localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
3,reboot 既可修改原主机名。
（二）CentOS7.2修改主机名
CentOS7.2修改主机名相对于6.5版本又有所改进，不需要重启就可以直接修改，具体的方法有如下三种：
（1）修改配置文件/etc/hostname来进行修改
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[root@localhost ~]
# vim /etc/hostname
server23
[root@localhost ~]
# systemctl restart systemd-hostnamed.service
[root@localhost ~]
# hostname
server23
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（2）通过nmtui修改主机名
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[root@localhost ~]
# nmtui
┌─────────────────┤ Set Hostname ├──────────────────┐
│ │
│ Hostname Server23________________________________ │
│ │
│ <Cancel> <OK> │
│ │
└───────────────────────────────────────────────────┘
[root@localhost ~]
# hostname
Server23
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（3） hostnamectl的命令行工具
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[root@localhost ~]
# 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@localhost ~]
# hostnamectl status
Static
hostname
: Server23
Icon name: computer-vm
Chassis: vm
Machine ID: b832bc29266640fe83d7256d53840cdc
Boot ID: 33590b06c20b45bab1e8e12fbf4986d2
Virtualization: microsoft
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:
/o
:centos:centos:7
Kernel: Linux 3.10.0-327.el7.x86_64
Architecture: x86-64
[root@localhost ~]
# hostnamectl set-hostname servers23
[root@localhost ~]
# hostname
servers23
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本文转自 lqbyz 51CTO博客，原文链接:http://blog.51cto.com/liqingbiao/1683981
