4.1修改hostname (1)修改文件 [root@hadoop100 ~]# vim /etc/hostname (2)修改为 hadoop100 4.2关闭防火墙 (1)关闭防火墙,关闭防火墙开机自启 [root@hadoop100 ~]# systemctl stop firewalld [root@hadoop100 ~]# systemctl disable firewalld