shell脚本之一键部署dns正向解析

一、DNS域名系统基础及图文详解请看 DNS域名解析服务及正向解析实验

二、shell一键部署DNS正向解析

#!/bin/bash
#先配置好yum
echo -e "----正在验证当前为仅主机还是NAT模式----"
ping -c 2 -w 2 www.baidu.com &> /dev/null

if [ $? -eq 0 ];then echo -e "检测当前为NAT模式，为您配置在线yum源"
    mkdir -p /etc/yum.repos.d/repo.bak
    mv -f /etc/yum.repos.d/* /etc/yum.repos.d/repo.bak &> /dev/null
    wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo &> /dev/null

    yum clean all &> /dev/null
    yum list &> /dev/null

    echo -e "在线源已配置完成"
else
    echo -e "检测当前为仅主机模式，为您配置本地yum源"
    mount /dev/sr0 /mnt &> /dev/null
    cd /etc/yum.repos.d/
    mkdir -p /etc/yum.repos.d/repo.bak

    mv -f /etc/yum.repos.d/* /etc/yum.repos.d/repo.bak &> /dev/null
echo '[local]
name=local
baseurl=file:///mnt
enabled=1
gpgcheck=0' > /etc/yum.repos.d/local.repo
yum clean all &> /dev/null
yum makecache &> /dev/null

     df -h | grep "/mnt"

     if [ $? -ne 0 ];then
     echo -e "检测当前为仅主机模式，但光盘未挂载!"
else
     echo -e "本地yum源已配置完成"
     fi
fi

#配置正向解析
#安装bind软件包
cd ~
yum -y install bind

read -p "请输入想要解析的域名，譬如（www.baidu.com）: " a

b=`echo $a | awk -F '.' 'BEGIN{OFS="."}{$2=$2;print $2,$3}'`

c=`ifconfig | grep "inet" | awk 'NR==1 {print $2}'`

#修改主配置文件
sed -i 's/127.0.0.1/any/' /etc/named.conf
sed -i 's/localhost/any/' /etc/named.conf
sed -i '14d' /etc/named.conf

#修改区域配置文件
sed -i '18,50d' /etc/named.rfc1912.zones
sed -i 's/localhost.localdomain/'$b'/' /etc/named.rfc1912.zones
sed -i 's/named.localhost/'$b'.zone/' /etc/named.rfc1912.zones

#修改区域数据配置文件
#备份区域数据配置文件
cd /var/named
cp -p named.localhost $b.zone

sed -i 's/@/'$b'./2' /var/named/$b.zone
sed -i 's/rname.invalid./admin.abc.com./' /var/named/$b.zone
sed -i '8s/@/'$b'./' /var/named/$b.zone
sed -i 's/127.0.0.1/'$c'/' /var/named/$b.zone
sed -i '10c www IN A '$c'' /var/named/$b.zone

#启动服务，关闭防火墙
systemctl stop firewalld
setenforce 0

systemctl start named
systemctl restart named
#named -u named

#如果服务启动卡住，可以执行下面命令解决
#rndc-confgen -r /dev/urandom -a

#在客户端的域名解析配置文件中添加DNS服务器地址
sed -i '2c nameserver '$c'' /etc/resolv.conf

三、脚本授权

四、执行脚本