Linux下如何用dnsmasq做dns cache server配置
安装过程比较简单yum -y install dnsmasq* wget http://www.keepalived.org/software/keepalived-1.2.9.tar.gztar zxvf keepalived-1.2.9.tar.gzcd keepalived-1.2.9./configure --prefix=/usr/local/keepalivedmake && make installmkdir /etc/keepalivedcp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/ln -s /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ln -s /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ln -s /usr/local/keepalived/sbin/keepalived /usr/sbin/chkconfig --add keepalivedchkconfig --level 35 keepalived on
keepalived的配置很简单，只需要配置一个vip可以在两台server之间飘来飘去就可以实现主备了
! configuration file for keepalived global_defs {notification_email { xxx@xxx.com}notification_email_from xxx@xxx.comsmtp_server 127.0.0.1smtp_connect_timeout 30router_id lvs_devel} vrrp_instance dnscache {state master // 另一台配置backupinterface eth1 // 在哪个接口上进行服务器状态检测virtual_router_id 51priority 180 // backup机器上配置100advert_int 1 // 检查间隔，单位为秒authentication { auth_type pass auth_pass 1234} virtual_ipaddress { // vip设置，指定到内网网卡 192.168.100.99/24 dev eth1}}
dnsmasq的配置也很简单
resolv-file=/etc/resolv.dnsmasq.confcache-size=1000conf-dir=/etc/dnsmasq.d
将dns地址写入到/etc/resolv.dnsmasq.conf文件中
echo "nameserver 8.8.8.8" > /etc/resolv.dnsmasq.conf
本机和局域网其它全部的服务器dns解析都用它
echo "nameserver 192.168.100.99" > /etc/resolv.conf
最后找一台局域网server验证一下，如果能解析就说明正常了.
nslookup www.google.cn 192.168.100.99
此方案只适合小型企业，规模少的情况下使用，解析量大的时候还是用bind最好。
下面是其它网友的补充：
复制代码 代码如下:
sudo pacman -s --needed dnsmasq
cd /etc
$ sudo cp -v dnsmasq.conf{,.orig}
`dnsmasq.conf' -> `dnsmasq.conf.orig'
$ sudo vim dnsmasq.conf
相比来说，dnsmasq的配置简单多了：
复制代码 代码如下:
resolv-file=/etc/dnsmasq.resolv.conf
addn-hosts=/etc/dnsmasq.hosts
local=/localnet/
no-dhcp-interface=eth0
conf-dir=/etc/dnsmasq.d
复制代码 代码如下:
$ sudo cp -v resolv.conf dnsmasq.resolv.conf
password:
`resolv.conf' -> `dnsmasq.resolv.conf'
sudo mkdir /etc/dnsmasq.d
sudo touch /etc/dnsmasq.hosts
sudo /etc/rc.d/dnsmasq start
最后，别忘记加入rc.conf daemons,注意要在network后面。
dnsmasq 可从额外的hosts文件读取条目，如可以这样添加正向解析：
echo "ip地址 域名" > /etc/dnsmasq.hosts
另外，重启dnsmasq可以用sighup（可以在修改hosts文件后，让配置生效）
killall -s sighup dnsmasq
查看服务状态：
netstat -tunl
tcp 0 0 0.0.0.0:53 0.0.0.0:* listen
udp 0 0 0.0.0.0:53 0.0.0.0:*
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