centos7修改hostname

//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