2、DNS配置文件：cat /etc/resolv.conf
主机和IP绑定：cat /etc/hosts
主机名：cat /etc/hostname
3、关闭防火墙并设置开机不启动
centos 7
查看防火墙状态：systemctl status firewalld
关闭：systemctl stop firewalld
开启：systemctl start firewalld
开机自动关闭：systemctl disable firewalld
开机自动启动：systemctl enable firewalld
centos6
关闭防火墙
chkconfig iptables off
开启防火墙
chkconifg iptables on
查看开机是否启动：chkconfig --list|grep network(centos 6 )
chkconfig iptables --list
4、临时和永久关闭Selinux
临时关闭：
getenforce
[root@centos7 ~]# getenforce
Enforcing
setenforce 0
[root@centos7 ~]# setenforce
usage: setenforce [ Enforcing | Permissive | 1 | 0 ]
setenforce:SELinux is disabled
修改配置文件：
vim /etc/selinux/config
centos 网卡重启/防火墙/selinux/hosts-dns
原文：https://blog.51cto.com/13718453/2468397