centos6 名字服务dnsmasq配置

[grid_hd@hd1 Desktop]$ cat /etc/sysconfig/network

NETWORKING=yes

HOSTNAME=hd1.asn.cn #主机名为hd1.asn.cn （asn.cn为搜索域）

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[grid_hd@hd1 Desktop]$ cat /etc/hosts

127.0.0.1 ????hd1.asn.cn????hd1???? localhost???? localhost.localdomain #在本机中，把名字hd1.asn.cn, hd1, localhost和localhost.localdomain都映射到127.0.0.1

[grid_hd@hd2 Desktop]$ cat /etc/sysconfig/network

NETWORKING=yes

HOSTNAME=hd2.asn.cn

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[grid_hd@hd2 Desktop]$ cat /etc/hosts

127.0.0.1???? hd2.asn.cn????hd2???? localhost localhost.localdomain

[grid_hd@hd3 Desktop]$ hostname

hd3.asn.cn

[grid_hd@hd3 Desktop]$ cat /etc/hosts

127.0.0.1????hd3.asn.cn????hd3????localhost localhost.localdomain

#!/bin/sh

#

# Startup script for the DNS caching server

#

# chkconfig: - 49 50

# description: This script starts your DNS caching server 该脚本启动你的DNS缓存服务

# processname: dnsmasq

# pidfile: /var/run/dnsmasq.pid

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# Source function library.

. /etc/rc.d/init.d/functions

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# Source networking configuration.

. /etc/sysconfig/network

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# Check that networking is up.

[ ${NETWORKING} = "no" ] && exit 0

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dnsmasq=/usr/sbin/dnsmasq #定义dnsmasq变量

[ -f $dnsmasq ] || exit 0

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DOMAIN_SUFFIX=`dnsdomainname`

if [ ! -z "${DOMAIN_SUFFIX}" ]; then

OPTIONS="-s $DOMAIN_SUFFIX" #定义OPTIONS变量

fi

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RETVAL=0 #定义RETVAL变量

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PIDFILE="/var/run/dnsmasq.pid" #定义PIDFILE变量

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# See how we were called.

case "$1" in #$0为程序名，$1代表第一参数

#如果输入参数是start

start)

if [ $UID -ne 0 ] ; then

echo "User has insufficient privilege."

exit 4

fi

echo -n "Starting dnsmasq: "

daemon $dnsmasq $OPTIONS

RETVAL=$?

echo

[ $RETVAL -eq 0 ] && touch /var/lock/subsys/dnsmasq

;;

#如果输入参数是stop

stop)

if test "x`pidfileofproc dnsmasq`" != x; then

echo -n "Shutting down dnsmasq: "

killproc dnsmasq

fi

RETVAL=$?

echo

[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/dnsmasq $PIDFILE

;;

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status)

status -p $PIDFILE dnsmasq

RETVAL=$?

;;

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reload)

if test "x`pidfileofproc dnsmasq`" != x; then

echo -n "Reloading dnsmasq: "

killproc dnsmasq -HUP

fi

RETVAL=$?

echo

;;

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force-reload)

# new configuration takes effect only after restart

$0 stop

$0 start

RETVAL=$?

;;

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restart)

$0 stop

$0 start

RETVAL=$?

;;

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condrestart)

if test "x`pidfileofproc dnsmasq`" != x; then

$0 stop

$0 start

RETVAL=$?

fi

;;

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?

*)

echo "Usage: $0 {start|stop|restart|reload|condrestart|status}"

exit 2

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esac #

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exit $RETVAL

[grid_hd@hd1 ~]$ cat /etc/dnsmasq.conf

# Change this line if you want dns to get its upstream servers from somewhere other that /etc/resolv.conf

# 如果你想让dns从某个地方（而不是/etc/resolv.conf）获得上游服务

resolv-file=/etc/dnsmasq/resolv.conf ##从/etc/dnsmasq/resolv.conf文件中获得上游DNS服务的IP地址

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# By default, dnsmasq will send queries to any of the upstream servers it knows about

# 默认dnsmasq会把查询请求发送到它知道的任意一个上游DNS服务器

# and tries to favour servers to are known to be up.

# Uncommenting this forces dnsmasq to try each query with each server strictly in the order they appear in /etc/resolv.conf

# 解注该行，强制dnsmasq严格以/etc/resolv.conf文件中每个服务的出现顺序尝试查询

strict-order

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# Or which to listen on by address (remember to include 127.0.0.1 if you use this.)

listen-address=192.168.145.151,127.0.0.1

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# For debugging purposes, log each DNS query as it passes through dnsmasq.

log-queries

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# If you don‘t want dnsmasq to read /etc/hosts, uncomment the following line.

no-hosts

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# or if you want it to read another file, as well as /etc/hosts, use this.

addn-hosts=/etc/dnsmasq/hosts

[grid_hd@hd1 ~]$ cat /etc/dnsmasq/resolv.conf

nameserver????192.168.145.2

nameserver????8.8.8.8

nameserver????8.8.4.4

[grid_hd@hd1 ~]$ cat /etc/dnsmasq/hosts

192.168.145.151????????hd1.asn.cn????hd1

192.168.145.152????????hd2.asn.cn????hd2

192.168.145.153????????hd3.asn.cn????hd3