Install bind9 as a local dns cache on ubuntu

#!/bin/bash

apt-get update
apt-get install bind9
cat <<EOF > /etc/bind/named.conf.options
options {
  directory "/var/cache/bind";
  forwarders {
    8.8.8.8;
    8.8.4.4;
    208.67.220.220;
  };
  auth-nxdomain no;    # conform to RFC1035
  listen-on-v6 { none; };
  listen-on { 127.0.0.1; 10.9.8.1; 172.17.0.1; };
};
EOF
/etc/init.d/bind9 restart
echo 'nameserver 127.0.0.1' > /etc/resolv.conf
/etc/init.d/dns-clean restart
sed -i -e 's/#prepend domain-name-servers 127.0.0.1;/prepend domain-name-servers 127.0.0.1;/g' /etc/dhcp/dhclient.conf