#!/bin/bash 
#检测是否挂载
df | grep "sr0"
if [ $? -eq 0 ];then    #挂载则直接安装dns软件包
yum -y install bind &> /dev/null
else
mount /dev/sr0 /mnt   #若没挂载，则先进行挂载，再安装软件包
yum -y install bind &> /dev/null
fi

#修改主配置文件 ：/etc/named.conf
sed -i 's/127.0.0.1/any/' /etc/named.conf
sed -i 's/localhost/any/' /etc/named.conf

#修改区域配置文件 ：/etc/named.rfc1912.zones
sed -i 's/localhost.localdomain/lic.com/' /etc/named.rfc1912.zones
sed -i 's/named.localhost/lic.com.zone/' /etc/named.rfc1912.zones
sed -i '18,100d' /etc/named.rfc1912.zones

#修改区域数据配置文件 ：/var/named/named.localhost
cd /var/named
cp -p named.localhost lic.com.zone
sed -i 's/@/lic.com./g' /var/named/lic.com.zone
sed -i 's/127.0.0.1/192.168.109.15/' /var/named/lic.com.zone
sed -i '9a www IN A  192.168.109.15' /var/named/lic.com.zone
sed -i '/AAAA/d' /var/named/lic.com.zone

#添加指定dns服务器
sed -i '1a nameserver 192.168.109.15' /etc/resolv.conf

#关闭系统防火墙和系统安全机制
systemctl stop firewalld
setenforce 0

#开启dns服务
systemctl restart named