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: x86-642. 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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