keepalived + LVS

master LVS keepalived configure file：

global_defs {
   notification_email {
          [email protected]
         [email protected]
   }
   notification_email_from [email protected]
   smtp_connect_timeout 3
   smtp_server 127.0.0.1
   router_id LVS_DEVEL
}
vrrp_script chk_schedown {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0" # 测试文件；如果这个目录下有down这个文件；就关闭服务；
   interval 2 # 2秒钟检测一次
   weight -2 # 如果down了就将权重-2
}
vrrp_instance VI_1 {
    interface eth0
    state MASTER
    priority 101
    virtual_router_id 51
    garp_master_delay 1
    authentication {
        auth_type PASS
        auth_pass password
    }
    track_interface {
       eth0
    }
    virtual_ipaddress {
        172.16.249.100/16 dev eth0 label eth0:0
    }
    track_script {
        chk_schedown
    }
}
virtual_server 172.16.249.100 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP
#    sorry_server 192.168.200.200 1358
    real_server 172.16.249.75 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server 172.16.249.31 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

slave LVS keepalived configure file;

global_defs {
   notification_email {
          [email protected]
         [email protected]
   }
   notification_email_from [email protected]
   smtp_connect_timeout 3
   smtp_server 127.0.0.1
   router_id LVS_DEVEL
}
vrrp_script chk_schedown {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
   interval 2
   weight -2
}
vrrp_instance VI_1 {
    interface eth0
    state MASTER
    priority 100
    virtual_router_id 51
    garp_master_delay 1
    authentication {
        auth_type PASS
        auth_pass password
    }
    track_interface {
       eth0
    }
    virtual_ipaddress {
        172.16.249.100/16 dev eth0 label eth0:0
    }
    track_script {
        chk_schedown
    }
}
virtual_server 172.16.249.100 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP
#    sorry_server 192.168.200.200 1358
    real_server 172.16.249.75 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server 172.16.249.31 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

realserver configure file：

# cat realserver.sh
#!/bin/bash
#
# Script to start LVS DR real server.
# description: LVS DR real server
#
.  /etc/rc.d/init.d/functions
VIP=172.16.249.100
host=`/bin/hostname`
case "$1" in
start)
       # Start LVS-DR real server on this machine.
        /sbin/ifconfig lo down
        /sbin/ifconfig lo up
        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
        /sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
        /sbin/route add -host $VIP dev lo:0
;;
stop)
        # Stop LVS-DR real server loopback device(s).
        /sbin/ifconfig lo:0 down
        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
;;
status)
        # Status of LVS-DR real server.
        islothere=`/sbin/ifconfig lo:0 | grep $VIP`
        isrothere=`netstat -rn | grep "lo:0" | grep $VIP`
        if [ ! "$islothere" -o ! "isrothere" ];then
            # Either the route or the lo:0 device
            # not found.
            echo "LVS-DR real server Stopped."
        else
            echo "LVS-DR real server Running."
        fi
;;
*)
            # Invalid entry.
            echo "$0: Usage: $0 {start|status|stop}"
            exit 1
;;
esac