[root@centos7 ~]$ hostnamectl set-hostname prd_web1 # 使用这个命令会立即生效且重启也生效[root@centos7 ~]$ hostname # 查看下prd_web1[root@centos7 ~]$ vim /etc/hosts # 编辑下hosts文件, 给127.0.0.1添加hostname[root@centos7 ~]$ cat /etc/hosts # 检查127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 prd_web1::1 localhost localhost.localdomain localhost6 localhost6.localdomain6