注册阿里云服务器后主机名称太长看着不舒服所以想改名

在网上找了好几种方法，大多就是更改/etc/network和/etc/hosts文件然后进行重启，试了几次都没有改过了

然后在博客https://blog.csdn.net/weixin_37282478/article/details/82965461，找到了很好的方法

hostnamectl set-hostname ''liangkk

关于hostnamectl命令简单介绍

1、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      显示当前主机配置
  set-hostname NAME      Set system hostname                 设置主机名称
  set-icon-name NAME     Set icon name for host              设置主机图标名称
  set-chassis NAME       Set chassis type for host           设置主机底盘类型
  set-deployment NAME    Set deployment environment for host 设置主机部署环境
  set-location NAME      Set location for host

2、hostnamectl 或者hostnamectl status

   Static hostname（主机名称）: liangkk
         Icon name（图标名称）: computer-vm
           Chassis（底盘类型）: vm
         Machine ID（机器ID）: 963c2c41b0833f7b063dddac6b2e486
            Boot ID（引导ID）: 83dee24a02896b5a73986b1913f61f7
     Virtualization（虚拟化）: kvm
 Operating System（操作系统）: CentOS Linux 7 (Core)
      CPE OS Name（操作系统）: cpe:/o:centos:centos:7
               Kernel（内核）: Linux 3.10.0-514.26.2.el7.x86_64
         Architecture（架构）: x86-64