Linux 시스템의 호스트 이름을 수정하는 방법

[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

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

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