LVS+keepalived DR模式配置高可用负载均衡集群

! Configuration File for keepalived
//全局定义
global_defs {  
   notification_email     //定义邮件
   { 
      xxxxxxxxx@163.com    //定义邮件地址
   }
   notification_email_from xxxxxxxxx@163.com 
   smtp_server mail.163.com //定义邮件服务器
   smtp_connect_timeout 30  //邮件超时时间
   router_id LVS_DEVEL      //route_id标识
}

//定义VRR组
vrrp_instance VI_1 { 
    state MASTER           //定义为MASTER
    interface eth0         //对外访问的网络接口
    virtual_router_id 100  //虚拟路由标识(注意要主从一致)
    priority 100           //优先级(主肯定比从高)
    nopreempt              //不抢占模式
    advert_int 1           //广播周期秒数
    authentication {
        auth_type PASS
        auth_pass 2209
    }
    virtual_ipaddress {
        10.0.100.203      //VIP地址
 }
}

//VIP地址与端口等设置-->注意DR模式的VIP端口和所有WEB端口应该保持一致
virtual_server 10.0.100.203 80 { 
    delay_loop 6  //健康检查时间间隔，单位秒
    lb_algo rr    //调度算法为rr
    lb_kind DR    //模式为DR
    persistence_timeout 0 //设置同一IP多少秒内的请求都发送到同一个realserver
    protocol TCP   //使用TCP协议

//realserver的IP与端口等设置   
    real_server 10.0.2.29 80{ 
        weight 1 
        TCP_CHECK {
        connect_timeout 10   //连接超时时间，单位s
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80      //连接端口
} 

}
    real_server 10.0.100.202 80 {
        weight 1
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
     }
}

! Configuration File for keepalived
global_defs {  
   notification_email 
   { 
      xxxxxxxxx@163.com  
   }
   notification_email_from xxxxxxxxx@163.com 
   smtp_server mail.163.com 
   smtp_connect_timeout 30 
   router_id LVS_DEVEL  
}

vrrp_instance VI_1 { 
    state BACKUP      //这里的角色是BACKUP
    interface eth0
    virtual_router_id 100  //这里注意和MASTER保持一致
    priority 90           //优先级设置应比MASTER低
    advert_int 1 
    authentication {
        auth_type PASS
        auth_pass 2209
    }
    virtual_ipaddress {
        10.0.100.203
 }
}

virtual_server 10.0.100.203 80 { 
    delay_loop 6 
    lb_algo rr   
    lb_kind DR   
    persistence_timeout 0 
    protocol TCP  
   
    real_server 10.0.2.29 80{ 
        weight 1 
        TCP_CHECK {
        connect_timeout 10   
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80  
} 
}
    real_server 10.0.100.202 80 {
        weight 1
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
     }
}

#!/bin/bash
# Written by NetSeek 
# description: Config realserver lo and apply noarp 
WEB_VIP="10.0.100.203"        //这里是VIP地址

. /etc/rc.d/init.d/functions

case "$1" in
start)
       ifconfig lo:0 $WEB_VIP netmask 255.255.255.255 broadcast $WEB_VIP
       /sbin/route add -host $WEB_VIP dev lo:0
       echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
       echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
       echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
       echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
       sysctl -p >/dev/null 2>&1
       echo "RealServer Start OK"
       ;;
stop)
       ifconfig lo:0 down
       route del $WEB_VIP >/dev/null 2>&1
       echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
       echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
       echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
       echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
       echo "RealServer Stoped"
       ;;
status)
        # Status of LVS-DR real server.
        islothere=`/sbin/ifconfig lo:0 | grep $WEB_VIP`
        isrothere=`netstat -rn | grep "lo:0" | grep $web_VIP`
        if [ ! "$islothere" -o ! "isrothere" ]
        then
            echo "LVS-DR real server Stopped."
        else
            echo "LVS-DR Running."
        fi 
        ;;
*)
        # Invalid entry.
        echo "$0: Usage: $0 {start|status|stop}"
        exit 1
        ;;
esac
exit 0