keepalived 配置 dns 单点恢复

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keepalived 配置 dns 单点恢复


1.vim /etc/keepalived/keepalived.conf


vrrp_script chk_dns {
   script "/usr/local/sbin/check_dns.sh"  #在这里添加脚本链接
   interval 3       #脚本执行间隔
   weight -10     # 修改权重
}
vrrp_instance VI_1 {
    state BACKUP    # 备用用 BACKUP
    interface eth2   #用的是哪个网卡
    virtual_router_id 88  #虚拟路由地址必须一样，才能配置成一个组
    priority 100   # 备用用 90
    advert_int 1  #MASTER与BACKUP负载均衡器之间同步检查的时间间隔，单位是秒
    nopreempt
    authentication {
        auth_type PASS  #(密码形式)
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.32.88
    }
    track_script {
        chk_dns     #添加脚本执行
    }
    notify_master "/bin/bash -x /usr/local/sbin/modify_master.sh 2>&1 | tee /tmp/modimaster.txt"
    notify_backup "/bin/bash -x /usr/local/sbin/modify_master.sh 2>&1 | tee /tmp/modibackup.txt"
}


virtual_server 192.168.32.88 53 {
    delay_loop 6    #每隔6s 查询 realserver 状态
    lb_algo rr    #lvs 算法
    lb_kind NAT     #Direct Route
    persistence_timeout 0    #会话保持时间，单位是秒（可以适当延长时间以保持session）
    protocol TCP     # 用 TCP协议检查 realserver 状态
    real_server 192.168.32.85 53 {
        weight 1
        notify_down "/bin/sh -x /usr/local/sbin/keepalived.sh 2>&1 | tee /tmp/tmp.txt"
          TCP_CHECK {
              connect_timeout 10   #10s 无响应超时
               nb_get_retry 3
               delay_before_retry 3
               connect_port 53
          }
    }
}




2.vim /usr/local/sbin/check_dns.sh


#!/bin/bash


ll=`ping -c 3 www.zjtest8.com`


if [ $? -eq 1  ]; then
        service keepalived restart
        /usr/bin/killall -9 named
        /usr/local/named/sbin/named -c /usr/local/named/etc/named.conf
        exit 0
else
        exit 1
fi

vim /usr/local/sbin/keepalived.sh

#!/bin/bash

service keepalived restart

killall -9 named

/usr/local/named/sbin/named -c /usr/local/named/etc/named.conf

vim /usr/local/sbin/modify_master.sh

#!/bin/bash

killall -9 named

/usr/local/named/sbin/named -c /usr/local/named/etc/named.conf