编写安装配置DHCP服务脚本

要求：
1、自动完成安装，基本配置
2、通过提示输入网段、子网掩码、网关、DNS、IP起止地址等信息完成作用域的添加

【方法一】：

#!/bin/bash
conf="/etc/dhcpd.conf"
rpm -q dhcp &> /dev/null
if [ $? -ne 0 ];then
yum -y install dhcp
fi

grep "subnet" $conf &> /dev/null

if [ $? -ne 0 ]; then
echo "
ddns-update-style interim;
ignore client-updates;
default-lease-time 21600;
max-lease-time 43200;
" > $conf
fi

read -p "please input network:" network

read -p "please input netmask:" netmask
read -p "please input gateway:" gateway
read -p "please input DNS:" dns
read -p "please input start_ip:" start_ip
read -p "please input end_ip:" end_ip

echo "
subnet $network netmask $netmask {
option routers $gateway;
option subnet-mask $netmask;
option domain-name-servers $dns;
range dynamic-bootp $start_ip $end_ip;
}

" >> $conf
service dhcpd restart

【方法二】：

#!/bin/bash
dhcpconf=/etc/dhcpd.conf

rpm -q dhcp &> /dev/null

if [ $? -ne 0 ];then
yum -y install dhcp
fi
grep "subnet" $dhcpconf &> /dev/null

if [ $? -ne 0 ];then
echo "ddns-update-style interim;
ignore client-updates;
default-lease-time 21600;
max-lease-time 43200;" > $dhcpconf
fi

while true
do
read -p "please input Network:" network
read -p "please input Netmask:" netmask
read -p "please input Gateway:" gateway
read -p "please input DNS:" dns
read -p "please input Start_IP:" start_ip
read -p "please input End_IP:" end_ip

grep $network $dhcpconf &> /dev/null

if [ $? -ne 0 ];then
echo "subnet $network netmask $netmask {
option routers $gateway;
option subnet-mask $netmask;
option domain-name-servers $dns;
range dynamic-bootp $start_ip $end_ip;
}" >> $dhcpconf

read -p "continue to do (yes/no)?" yn

if [ $yn = "no" ]; then
service dhcpd status &> /dev/null
if [ $? -ne 0 ]; then
service dhcpd start &> /dev/null
else
service dhcpd reload &> /dev/null
fi
exit 0
fi
fi
done