yum install ipvsadm openssl-devel popt popt-devel libnl-devel 
cd /opt/src/
tar xzvf keepalived-1.2.7.tar.gz
cd keepalived-1.2.7
make && make install
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/sbin/keepalived /usr/sbin/

[root@WEB ~]# cat /etc/keepalived/keepalived.conf  
! Configuration File for keepalived

global_defs {
   notification_email {
   notification_email_from 123@123.com
   smtp_server mail.123.com
   smtp_connect_timeout 30
   router_id LVS_DEVEL

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 52
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    virtual_ipaddress { 
virtual_server 80 {
    delay_loop 6
    lb_algo lc
    lb_kind DR
    #lb_kind TUN
    persistence_timeout 60
    protocol TCP
    real_server 80 {
        weight 3            
        TCP_CHECK {
        connect_timeout 30   
        nb_get_retry 3
        delay_before_retry 2
        connect_port 80
    real_server 80 {
        weight 3
        TCP_CHECK {
        connect_timeout 30
        nb_get_retry 3
        delay_before_retry 2
        connect_port 80
[root@WEB ~]# 
[root@WEB ~]# service ipvsadm start
[root@WEB ~]# service keepalived start

echo "1" > /proc/sys/net/ipv4/ip_forward

[root@localhost ~]# cat /usr/local/vip.sh 
# Script to start LVS DR real server.
# description: LVS DR real server
.  /etc/rc.d/init.d/functions
case "$1" in
       # 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 up
        /sbin/route add  $VIP dev lo:0
        # 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 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."
            echo "LVS-DR real server Running."
            # Invalid entry.
            echo "$0: Usage: $0 {start|status|stop}"
            exit 1
[root@localhost ~]#  /usr/local/vip.sh start|stop|status


ipvsadm -ln
ipvsadm -lnc
ipvsadm -l -n --stats


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