How to modify the host name of Linux system

1. View the current host name

[root@fangjian ~]# hostnamectl
  static hostname: brace
  pretty hostname: brace
     icon name: computer-vm
      chassis: vm
    machine id: 20191225111607875619293640639763
      boot id: 25ac5021d229471382a26bea3d351de3
  virtualization: kvm
 operating system: centos linux 7 (core)
    cpe os name: cpe:/o:centos:centos:7
      kernel: linux 3.10.0-1062.9.1.el7.x86_64
   architecture: x86-64

2. Temporarily modify the host name

[root@fangjian ~]# hostname yin  #临时修改主机名，关机后失效
[root@fangjian ~]# hostname
yin

3. Permanently modify the host name Name

1. Method 1: Use the hostnamectl command

[root@fangjian ~]# hostnamectl set-hostname brace #永久设置用户名，关机后不失效
[root@fangjian ~]# hostname
brace

2. Method 2: Modify the configuration file /etc/hostname, save and exit

[root@fangjian ~]# vi /etc/hostname  # 进入vi，删除旧主机名，输入新主机名，esc后冒号 wq退出保存
brace　　　　　　　　　　　　　　　　　 # reboot重启生效

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