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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。 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 !ConfigurationFilefor 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。 (责任编辑：IT) |