Linux下用dnsmasq做dns cache server的配置方法
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2020-09-15
19:25:17
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Linux下用下用dnsmasq做做dns cache server的配置方法的配置方法
最近国外的服务器本地DNS总是出故障，闪断一会儿都会影响业务。于是在机房里找了两台Server，安装上
keepalived和dnsmasq实际本地的DNS缓存
目前最新版是2.7.1 ，可去其FTP下载：http://www.thekelleys.org.uk/dnsmasq/
安装过程比较简单
yum -y install dnsmasq*
wget http://www.keepalived.org/software/keepalived-1.2.9.tar.gz
tar zxvf keepalived-1.2.9.tar.gz
cd keepalived-1.2.9
./configure --prefix=/usr/local/keepalived
make && make install
mkdir /etc/keepalived
cp /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 keepalived
chkconfig --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.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 // 在哪个接口上进行服务器状态检测
virtual_router_id 51
priority 180 // BACKUP机器上配置100
advert_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.conf
cache-size=1000
conf-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：
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