dns正反向解析



    安装dns

      yum install bind -y
    systemctl start named 
    systemctl enable named

关闭火墙
    systemctl stop firewalld
    systemctl disable firewalld

改主配置文件
   vim /etc/named.conf

   
     systemctl restart named
   写正向解析文件
    vim /etc/named.rfc1912.zones 

复制解析内容
    cd /var/named
     ls
     cp -p named.localhost  westos.com.zone
     ls
     vim  westos.com.zone

     systemctl restart named

验证：在另一台从机上添加：

   vim /etc/resolv.conf

 内容：servername：  主机的ip地址

   这里是  dig www.westos.com

 反向解析：
   
    vim /etc/named.rfc1912.zones

   
     cd /var/named
    ls
    
     cp -p named.loopback  westos.com.ptr
     ls
     vim westos.com.ptr

     sytemctl restart named    从机上验证：dig -x 要解析的ip