1. 修改vi /etc/hosts
   127.0.0.1 Server_China localhost.localdomain localhost
2. 修改vi /etc/sysconfig/network
   HOSTNAME=Server_China
3. 输入下面命令生效
   #hostname Server_China
4. centos7 设置主机名
   #!/bin/bashif [ $# -ne 1 ];then    echo `basename $0` "input hostname"else    hostnamectl --static set-hostname $1    hostnamectl --transient  set-hostname $1fi