单机双线路实现负载均衡+双线备份
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使用BIND实现电信教育网双线路负载+双线路冗余
环境：
电信网络IP:192.168.1.1（服务器使用）192.168.1.2（测试使用）
教育网IP:192.168.1.51 （服务器使用）192.168.1.52（测试使用）
DNS服务器IP: 192.168.1.100
邮件服务器域名： IP为电信192.168.1.1教育网192.168.1.51
一．DNS服务器配置（实现双线路负载均衡）
1.修改/etc/named.conf
options {
listen-on port 53 { any; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
memstatistics-file "/var/named/data/named_mem_stats.txt";
allow-query { any; };
recursion yes;
dnssec-enable yes;
dnssec-validation yes;
dnssec-lookaside auto;
/* Path to ISC DLV key */
bindkeys-file "/etc/named.iscdlv.key";
};
logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
view dns1 {
match-clients { 192.168.1.2; };#定义哪些IP读取/etc/named/named.zones zone "." IN {
type hint;
file "named.ca";
};
include "/etc/named/named.zones";
};
view dns2 {
match-clients { 192.168.1.52; };定义哪些IP读取/etc/named.rfc1912.zones zone "." IN {
type hint;
file "named.ca";
};
include "/etc/named.rfc1912.zones";
};
2.修改/etc/named/named.zones，/etc/named.rfc1912.zones配置
/etc/named/named.zones是不存在的，直接CP一份/etc/named.rfc1912.zones内容，然后修改。
具体配置如下：
（1）/etc/named/named.zones
加入：
zone "" IN {
type master;
file "hulin1.dns";
allow-update { none; };
};
（2）/etc/named.rfc1912.zones
加入：
zone "" IN {
type master;
file "hulin51.dns";
allow-update { none; };
};
3.在/var/named/新建hulin1.dns,hulin51.dns配置文件
（1）hulin1.dns配置如下
$TTL 1D
@ IN SOA . root (
0 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
NS .
ns IN A 192.168.1.100
mail IN A 192.168.1.1
IN MX 10
（2）hulin51.dns配置如下
$TTL 1D
@ IN SOA . root (
0 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
NS .
Ns IN A 192.168.1.100
mail IN A 192.168.1.51
IN MX 10
4.重启BIND，至此，双线路负载成功
测试：用IP为192.168.1.2的机器解析到IP为192.168.1.1 用IP为192.168.1.52的机器解析到IP为192.168.1.51
二．实现双线路冗余
1.在/root 下新建脚本ping1.sh,ping51.sh脚本内容如下：
（1）ping1.sh
#!/bin/bash
ping -c2 192.168.1.1 &>/dev/null
if [ $? = 1 ]
then/named1.sh&&
mv/root/named1.conf/root/named1.conf.bak&&
echo "192.168.1.1 is down"|mail -s "sos" 408642605@
else mv /root/named1.conf.bak /root/named1.conf&&
cp /root/named.conf /etc/named.conf&&
/etc/init.d/named restart
&&echo "192.168.1.1 is up"|mail -s "sos" 408642605@
fi
（2）ping51.sh
#!/bin/bash
ping -c2 192.168.1.51 &>/dev/null
if [ $? = 1 ]
then/named51.sh&&
mv/root/named51.conf/root/named51.conf.bak&&
echo "192.168.1.51 is down"|mail -s "sos" 408642605@
else mv /root/named51.conf.bak /root/named51.conf
cp /root/named.conf /etc/named.conf&&
/etc/init.d/named restart
&&echo "192.168.1.51 is up"|mail -s "sos" 408642605@
fi
2．在/root下新建named1.sh named51.sh 脚本内容如下
（1）named1.sh
cp -p /root/named1.conf /etc/named.conf&&/etc/init.d/named restart （2）named51.sh
cp -p /root/named51.conf /etc/named.conf&&/etc/init.d/named restart
3.在/root下新建named.conf(直接拷贝/etc/named.conf) named1.conf,namd51.conf 具体