Linux下用dnsmasq做dns cache server的配置方法_Linux

目前最新版是2.7.1 ，可去其FTP下載：http://www.thekelleys.org.uk/dnsmasq/

安裝過程比較簡單

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的配置很簡單，只需要配置一個VIP可以在兩台Server之間飄來飄去就可以實現主備了

! Configuration File for keepalived global_defs {  notification_email {   xxx@xxx.com  }  notification_email_from xxx@xxx.com  smtp_server 127.0.0.1  smtp_connect_timeout 30  router_id LVS_DEVEL} vrrp_instance dnscache {  state MASTER         // 另一台配置BACKUP  interface eth1        // 在哪個介面上進行伺服器狀態檢測  virtual_router_id 51  priority 180         // BACKUP機器上配置100  advert_int 1         // 檢查間隔，單位為秒  authentication {    auth_type PASS    auth_pass 1234  }   virtual_ipaddress {       // VIP設定，指定到內網網卡     192.168.100.99/24 dev eth1  }}

dnsmasq的配置也很簡單

resolv-file=/etc/resolv.dnsmasq.confcache-size=1000conf-dir=/etc/dnsmasq.d

　　將dns地址寫入到/etc/resolv.dnsmasq.conf檔案中

echo "nameserver 8.8.8.8" > /etc/resolv.dnsmasq.conf

　　本機和區域網路其它全部的伺服器dns解析都用它

echo "nameserver 192.168.100.99" > /etc/resolv.conf

　　最後找一台區域網路Server驗證一下，如果能解析就說明正常了.

nslookup www.google.cn 192.168.100.99

　　此方案只適合小型企業，規模少的情況下使用，解析量大的時候還是用bind最好。

下面是其它網友的補充：

複製代碼 代碼如下:

sudo pacman -S --needed dnsmasq
cd /etc

[admin@huangye etc]$ sudo cp -v dnsmasq.conf{,.orig}
`dnsmasq.conf' -> `dnsmasq.conf.orig'

[admin@huangye etc]$ sudo vim dnsmasq.conf

相比來說，dnsmasq的配置簡單多了：

複製代碼 代碼如下:

resolv-file=/etc/dnsmasq.resolv.conf
addn-hosts=/etc/dnsmasq.hosts
local=/localnet/
no-dhcp-interface=eth0
conf-dir=/etc/dnsmasq.d

複製代碼 代碼如下:

[admin@huangye etc]$ 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

最後，別忘記加入rc.conf DAEMONS,注意要在network後面。

dnsmasq 可從額外的hosts檔案讀取條目，如可以這樣添加正向解析：

echo "IP地址 網域名稱" > /etc/dnsmasq.hosts

另外，重啟dnsmasq可以用SIGHUP（可以在修改hosts檔案後，讓配置生效）

 killall -s SIGHUP dnsmasq

查看服務狀態：

 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:*

再dig 一下，發現穩定在4ms ,我暈，同樣的配置，我在一台ubuntu server 10.04 上面dig 是1ms ,在我本地居然在4ms ,囧