keepalived 配置 dns 單點恢復

keepalived 配置 dns 單點恢復

1.vim /etc/keepalived/keepalived.conf

vrrp_script chk_dns {

   script "/usr/local/sbin/check_dns.sh"  #在這裏添加腳本連接

   interval 3       #腳本執行間隔

   weight -10     # 修改權重

}

vrrp_instance VI_1 {

    state BACKUP    # 備用用 BACKUP

    interface eth2   #用的是哪一個網卡

    virtual_router_id 88  #虛擬路由地址必須同樣，才能配置成一個組

    priority 100   # 備用用 90

    advert_int 1  #MASTER與BACKUP負載均衡器之間同步檢查的時間間隔，單位是秒

    nopreempt

    authentication {

        auth_type PASS  #(密碼形式)

        auth_pass 1111

    }

    virtual_ipaddress {

        192.168.32.88

    }

    track_script {

        chk_dns     #添加腳本執行

    }

    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 查詢 realserver 狀態

    lb_algo rr    #lvs 算法

    lb_kind NAT     #Direct Route

    persistence_timeout 0    #會話保持時間，單位是秒（能夠適當延長時間以保持session）

    protocol TCP     # 用 TCP協議檢查 realserver 狀態

    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 無響應超時

               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