DNS

yum install bind -y

systemctl start named

systemctl enable named

systemctl stop firewalld

主配置文件    /etc/named.conf

子配置文件   /etc/named.rfc1912.zone

目录   /var/named

一.高速缓存dns

vim /etc/named.conf

在其他主机上进行测试 记得要将dns修改

vim /etc/resolv.conf

nameserver 172.25.254.115

二.DNS正向解析

vim /etc/named.rfc1912.zone

cd /var/named

cp -p named.localhost westos.com.zone

vim /westos.com.zone

dig www.westos.com

三.DNS反向解析 

cd /var/named

cp -p named.loopback westos.com.ptr

vim westos.com.ptr

vim /etc/named.rfc.1912.zone

dig -x 172.25.254.115

四.DNS双向解析

cp -p /etc/named.rfc1912.zone /etc/named.rfc1912.zone.inter

vim /etc/named.conf

cd /var/named

cp -p westos.com.zone westos.com.inter

vim westom.com/inter

vim /etc/named.rfc1912.zone.inter

分别使用本地主机和外地主机 dig www.westos.com

五.辅助DNS

vim /etc/named.rfc1912.zone

辅助dns主机的设定

yum install bind -y

systemctl start named

systemctl stop firewalld

vim /etc/resolv.conf

vim /etc/named.rfc1912.zone

在辅助dns上  dig www.westos.com

六.dns的远程更新

1.基于IP

实验前备份数据

vim /etc/named.rfc1912.zone.inter

systemctl restart named

之后在215 主机上执行  nsupdate

dig hello.westos.com

还原原始数据

基于KEY

215主机上的配置

dnssec-keygen -a HMAC-MD5 -b 128 -n HOST westos

cp -p /etc/rndc.key /etc/westos.key

vim /etc/westos.key

vim /etc/named.conf

vim /etc/named.rfc1912.zone.inter

将生成的钥匙发送给115主机

在215主机上进行测试

七.DDNS配置

1.将辅助设备的主机名改为主DNS设置的域

设置主机IP为动态获取

2.DNS主机的设置

vim /etc/dhcp/dhcpd.cof

vim /var/named/westos.zone

之后在客户端dig www.westos.com 之后看到的IP地址是通过动态获取的IP。