Centos 7 搭建DNS正向解析和反向解析

Centos 7  搭建DNS正向解析和反向解析服务的三要素:安装-配置-启动 
1.使用yum安装DNS 
yum  install  bind -y 
2.修改配置文件 
     vi /etc/named.conf    修改以下内容：  listen-on port 53 { any; };  allow-query     { any; };vi /etc/named.rfc1912.zones    在末尾添加以下内容:zone "hello.com" IN {                     -----正向解析        type master;        file "hello.com.zone";};zone "80.168.192.in-addr.arpa" IN {  -----反向解析        type master;        file "hello.com.local";};wq    --保存退出cd /var/named/cp -p named.localhost hello.com.zone    ---复制模板创建一个正向解析文件跟你   file "hello.com.zone",文件名要一样; 
vi hello.com.zone           ---$TTL 1D@       IN SOA  hello.com. 123213123.qq.com (                                        1       ; serial                                        1D      ; refresh                                        1H      ; retry                                        1W      ; expire                                        3H )    ; minimum        NS      dns.hello.com.dns     IN A    192.168.80.100www     IN A    192.168.80.101ftp     IN A    192.168.80.102  创建一个反向解析   file "hello.com.local",文件名要一样; 
vi hello.com.local$TTL 1D@       IN SOA  hello.com. 12123123.qq.com (                                        0       ; serial                                        1D      ; refresh                                        1H      ; retry                                        1W      ; expire                                        3H )    ; minimum        NS      dns.hello.com.100     IN PTR  dns.hello.com.101     IN PTR  www.hello.com.检查主配置文件语法; 
named-checkconf3.启动DNS服务 
systemctl start named 
查看DNS服务是否启动成功   `netstat  -anpt  | grep  named` 
     测试DNS服务     1.安装nslookup命令     `yum   install  bind-utils  -y`     2.给网卡指定DNS     `vi /etc/sysconfig/network-scripts/ifcfg-ens32 `     在末尾添加以下内容:``` DNS1=192.168.80.100   (根据实际情况添写DNS地址) wq   ---保存退出     systemc  restart    network     ---重新启动网卡服务      3.使用nslookup测试正向解析和反向解析正向解析就是根据网址解析出ip地址 
反向解析就是根据ip地址解析出网址

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