1. 配置主机名
[root@hadoop01 ~]# hostname #显示当前主机名
方法一：通过配置文件/etc/hostname （重启后生效）
[root@hadoop01 ~]# vim /etc/hostname
方法二：通过命令hostnamectl set-hostname 新主机名（会自动把主机名改为小写）
[root@hadoop01 ~]# hostnamectl set-hostname hadoop01
2. 添加内网域名映射
[root@hadoop01 ~]# vim /etc/hosts
3. 关闭防火墙
启动： systemctl start firewalld
关闭： systemctl stop firewalld
查看状态： systemctl status firewalld
开机禁用 ： systemctl disable firewalld
开机启用 ： systemctl enable firewalld
4. 关闭SELINUX
[root@hadoop01 ~]# vim /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled #修改为 disabled
# SELINUXTYPE= can take one of three values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted