//使用这个命令会立即生效且重启也生效
[root@centos7 ~]$ hostnamectl set-hostname centos77.magedu.com
//查看下 [root@centos7 ~]$ hostname centos77.magedu.com
//编辑下hosts文件, 给127.0.0.1添加hostname [root@centos7 ~]$ vim /etc/hosts
//检查 [root@centos7 ~]$ cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 centos77.magedu.com ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6