linux下智能DNS配置過程
一、DNS服務(wù)器安裝
1、 軟件列表
BIND 9.3.2
ftp://ftp.isc.org/isc/bind9/9.3.2/bind-9.3.2.tar.gz
ftp://ftp.isc.org/isc/bind9/9.4.0a6/bind-9.4.0a6.tar.gz
2、 安裝BIND 9
安裝BIND9：
# tar zxvf bind-9.3.2.tar.gz
# cd bind-9.3.2
# ./configure --prefix=/usr/local/named --disable-ipv6
# make && make install
建立BIND用戶：
# groupadd bind
# useradd -g bind -d /usr/local/named -s /sbin/nologin bind
創(chuàng)建配置文件目錄：
# mkdir –p /usr/local/named/etc
# chown bind:bind /usr/local/named/etc
# chmod 700 /usr/local/named/etc
二、named.conf的配置
創(chuàng)建主要的配置文件：
# vi /usr/local/named/etc/named.conf
===========================named.conf=======================
acl "trust-lan" { 127.0.0.1/8; 192.168.0.0/16;};
options {
directory "/usr/local/named/etc/";
pid-file "/var/run/named/named.pid";
version "0.0.0";
datasize 40M;
allow-transfer {
"trust-lan";};
recursion yes;
allow-notify {
"trust-lan";
};
allow-recursion {
"trust-lan";
};
auth-nxdomain no;
forwarders {
211.162.106.9;
211.162.106.254;};
};
logging {
channel warning
{ file "/var/log/named/dns_warnings" versions 3 size 1240k;
severity warning;
print-category yes;
print-severity yes;
print-time yes;
};
#p#channel general_dns
{ file "/var/log/named/dns_logs" versions 3 size 1240k;
severity info;
print-category yes;
print-severity yes;
print-time yes;
};
category default { warning; };
category queries { general_dns; };
};
zone "." {
type hint;
file "named.root";
};
acl "CNC" {
58.16.0.0/16;
58.17.0.0/17;
58.17.128.0/17;
58.18.0.0/16;
58.19.0.0/16;
58.20.0.0/16;
58.21.0.0/16;
注：這些根據(jù)情況輸入IP地址段
};
view "view_cnc" {
match-clients { CNC; };
zone "." {
type hint;
file "named.root";
};
zone "0.0.127.IN-ADDR.ARPA" {
type master;
file "localhost.rev";
};
include "master/cnc.def";
};
view "view_any" {
match-clients { any; };
zone "." {
type hint;
file "named.root";
};
zone "0.0.127.IN-ADDR.ARPA" {
type master;
file "localhost.rev";
};
include "master/telecom.def";
};
添加完成后，保存。
三、更新根區(qū)文件：
# cd /usr/local/named/etc/
# wget ftp://ftp.internic.org/domain/named.root
創(chuàng)建PID和日志文件：
# mkdir /var/run/named/
# chmod 777 /var/run/named/
# chown bind:bind /var/run/named/
# mkdir /var/log/named/
# touch /var/log/named/dns_warnings
# touch /var/log/named/dns_logs
# chown bind:bind /var/log/named/*
# mkdir master
# touch master/cnc.def
# touch master/telecom.def
生成rndc-key：
# cd /usr/local/named/etc/
# ../sbin/rndc-confgen > rndc.conf
把rndc.conf中：
# Use with the following in named.conf, adjusting the allow list as needed:
后面以的部分加到/usr/local/named/etc/named.conf中并去掉注釋
運行測試：
# /usr/local/named/sbin/named -gc /usr/local/named/etc/named.conf &
狀態(tài)檢查：
# /usr/local/named/sbin/rndc status
四、建立啟動腳本：
# vi /etc/init.d/named
============================== named.sh============================
#!/bin/bash
#
# named a network name service.
#
#
# chkconfig: 545 35 75
# description: a name server
#
if [ `id -u` -ne 0 ]
then
echo "ERROR:For bind to port 53,must run as root."
exit 1
fi
case "" in
start)
if [ -x /usr/local/named/sbin/named ]; then
/usr/local/named/sbin/named -u bind -c /usr/local/named/etc/named.conf && echo . && echo 'BIND9 server started.'
fi
;;
stop)
kill `cat /var/run/named/pid` && echo . && echo 'BIND9 server stopped.'
;;
restart)
echo .
echo "Restart BIND9 server"
stop
sleep 10
start
;;
*)
echo " start | stop | restart"
;;
esac
===============================named.sh============================
# chmod 755 /etc/init.d/named
# chown root:root /etc/init.d/named
# chkconfig --add named
# chkconfig named on
五、添加一個NS
在域名的管理網(wǎng)站上，設(shè)定NS服務(wù)器為你安裝的DNS
#p#六、添加一個域名
# cd /usr/local/named/etc/master
# mkdir cnc
# mkdir telecom
# vi cnc.def
添加
zone "724cn.com" {
type master;
file "master/cnc/724cn.com";
};
# vi telecom.def
添加
zone "724cn.com" {
type master;
file "master/telecom/724cn.com";
};
添加網(wǎng)通的解析，解析到的IP為61.45.55.78
#vi cnc/724cn.com
添加
$TTL 3600
$ORIGIN 724cn.com.
@ IN SOA ns.724cn.com. root.ns.724cn.com.(
2005121013 ;Serial
3600 ; Refresh ( seconds )
900 ; Retry ( seconds )
68400 ; Expire ( seconds )
15 );Minimum TTL for Zone ( seconds )
;
@ IN NS ns.724cn.com.
@ IN A 211.162.106.9
www IN A 211.162.106.9
;
;end
添加電信的解析，解析到的IP為210.75.1.178
#vi telecom/724cn.com
添加
$TTL 3600
$ORIGIN 724cn.com.
@ IN SOA ns.724cn.com. root.ns.724cn.com.(
2005121013 ;Serial
3600 ; Refresh ( seconds )
900 ; Retry ( seconds )
68400 ; Expire ( seconds )
15 );Minimum TTL for Zone ( seconds )
;
@ IN NS ns.724cn.com.
@ IN A 211.162.106.254
www IN A 211.162.106.254
;
;end
#/usr/local/named/sbin/rndc reload
OK，到此你的DNS服務(wù)器就算是跑起來了。試一下分別用網(wǎng)通和電信的線路ping一下吧.
附：獲取IP地址范圍方法:
1、 利用shell程序獲取IP地址段
#!/bin/sh
FILE=/root/study/apnic/ip_apnic
rm -f $FILE
wget http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest -O $FILE
grep 'apnic|CN|ipv4|' $FILE | cut -f 4,5 -d'|'|sed -e 's/|/ /g' | while read ip cnt
do
echo $ip:$cnt
mask=$(cat > cn.net
NETNAME=`whois $ip@whois.apnic.net | sed -e '/./{H;$!d;}' -e 'x;/netnum/!d' |grep ^netname | sed -e 's/.*: \(.*\)//g' | sed -e 's/-.*//g'`
case $NETNAME in
CNC)
echo $ip/$mask >> CNCGROUP
;;
CHINANET|CNCGROUP)
echo $ip/$mask >> $NETNAME
;;
CHINATELECOM)
echo $ip/$mask >> CHINANET
;;
*)
echo $ip/$mask >> OTHER
;;
esac
done
2、 可以利用網(wǎng)上的資料，下面是最新的信息，然后利awk行成地址段即可。
wget http://218.66.103.230/vpn_route/cnc.new 新的網(wǎng)通路由表
wget http://218.66.103.230/vpn_route/chinanet.new 新的電信路由表
stop
sleep 10
注：對于配置智能DNS，主要用途為：1、解決網(wǎng)通與電信問題 2、實現(xiàn)區(qū)域規(guī)劃（不同區(qū)域訪問各自最近的服務(wù)器），下面以解決網(wǎng)通與電信連接問題的配置。至于實現(xiàn)2的功能，只需稍加更改即可。
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