Keepalived + LVS configuration template. VIP: 123.125.22.90 Master: 123.125.22.97 Backup: 123.125.22.98 RealServer1: 123.125.22.99 RealServer2: 123.125.22.100 Loadbalance algorithm: wrr Loadbalance type: DR

keepalived.lvs.backup.conf

! Configuration File for keepalived

global_defs {
   notification_email {
    admin@sina.com.cn
   }
   notification_email_from sec@sina.com.cn
   smtp_server mail.sina.com.cn
   smtp_connect_timeout 30
   router_id LVS_1
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 21
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass sinasec
    }
    virtual_ipaddress {
        123.125.22.90
    }
}

virtual_server 123.125.22.90 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    nat_mask 255.255.255.0
    #persistence_timeout 50
    protocol TCP

    real_server 123.125.22.99 80 {
        weight 10
        TCP_CHECK {
	    connect_port 80
	    nb_get_retry 3
            connect_timeout 3
        }
    }

    real_server 123.125.22.100 80 {
	weight 5
        TCP_CHECK {
	    connect_port 80
	    nb_get_retry 3
 	    connect_timeout 3
	}
    }
}

keepalived.lvs.master.conf

! Configuration File for keepalived

global_defs {
   notification_email {
    admin@sina.com.cn
   }
   notification_email_from sec@sina.com.cn
   smtp_server mail.sina.com.cn
   smtp_connect_timeout 30
   router_id LVS_2L
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 21
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass sinasec
    }
    virtual_ipaddress {
        123.125.22.90
    }
}

virtual_server 123.125.22.90 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    nat_mask 255.255.255.0
    #persistence_timeout 50
    protocol TCP

    real_server 123.125.22.99 80 {
        weight 10
        TCP_CHECK {
	    connect_port 80
	    nb_get_retry 3
            connect_timeout 3
        }
    }

    real_server 123.125.22.100 80 {
	weight 5
        TCP_CHECK {
	    connect_port 80
	    nb_get_retry 3
 	    connect_timeout 3
	}
    }
}

realserver.sh

#!/bin/bash
#description: Config realserver

VIP=123.125.22.90
 
/etc/rc.d/init.d/functions
 
case "$1" in
start)
       /sbin/ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
       /sbin/route add -host $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)
       /sbin/ifconfig lo:0 down
       /sbin/route del $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"
       ;;
*)
       echo "Usage: $0 {start|stop}"
       exit 1
esac
 
exit 0

so cool