交互脚本DHCP配置

#!/bin/bash
#山楂树之恋
#2019-8-26

#构建轰趴yum
read -p "请输入你的挂载点" dir
echo "正在挂载。。。。。"
mount | grep -q "/dev/sr0" && umount /dev/sr0
[ -d $dir ] || mkdir dir
mount /dev/sr0 $dir &> /dev/null
echo "挂载成功"
cd /etc/yum.repos.d/
[ -d likun ] || mkdir likun
mv C* likun
cat << EDF > local.repo
[xxx]
name=xxx
baseurl=file://$dir
enabled=1
gpgcheck=0
EDF
echo "清除小朋友"
yum clean all &> /dev/null
echo "构建轰趴基地yum"
yum makecache &> /dev/null
echo "构建成功"

#安装DHCP
echo "是否有DHCP,没有将进行安装"
yum -y instll dhcp &> /dev/null
if [ $(rpm -q dhcp ) = "dhcp-4.2.5.el7.centos.x86_64" ] &> /dev/null
then echo "安装完成"
fi
echo "修改主配置文件,q请输入你的机器内容"
read -p "请输入吗要分配的域名(例如:crushlinux.com): "  a
read -p "请输入你要分配的网段吧(192.168.100):  "  b
read -p "请输入吗要分配的IP范围( 例如 10  100 ) "  cc  mm
read -p "请输入你的路由网关( 192.168.100.1) "  s
cat << EDF > /etc/dhcp/dhcp.conf
option domain-name "$a";
option domain-name-servers 202.106.0.20,8.8.8.8;

default-lease-time 21600;
max-lease-time 43500;

subnet $b.0 netmask 255.255.255.0 {
range $ $b.$cc $b.$mm;
option routers $s;
}

EDF
#启动 DNCP
echo "重启服务--开机自启动中............."
systemctl start dhcpd &> /dev/null
systemctl restart dhcpd &> /dev/null
systemctl enable dhcpd &> /dev/null
systemctl status dhcpd | grep running &> /dev/nill
echo "亲！ DHCP服务已经启动"