[root@Keep-LB keepalived]# yum -y install ipvsadm

[root@Keep-LB keepalived]# yum -y install kernel-headers kernel-devel

[root@Keep-LB keepalived]# wget http://www.keepalived.org/software/keepalived-1.2.1.tar.gz

[root@Keep-LB keepalived]# ./configure --with-kernel-dir=/lib/modules/$(uname -r)/build

[root@Keep-LB keepalived]# make && make install

[root@Keep-LB keepalived]# cd /etc/sysconfig
[root@Keep-LB keepalived]# ln -s /usr/local/etc/sysconfig/keepalived .
[root@Keep-LB keepalived]# cd /etc/rc3.d/
[root@Keep-LB keepalived]# ln -s /usr/local/etc/rc.d/init.d/keepalived S100keepalived
[root@Keep-LB keepalived]# cd /etc/init.d/
[root@Keep-LB keepalived]# ln -s /usr/local/etc/rc.d/init.d/keepalived .
[root@Keep-LB keepalived]# cd /usr/local/etc/keepalived
[root@Keep-LB keepalived]# cp keepalived.conf keepalived.conf.bak

[root@Keep-LB keepalived]# cat keepalived.conf
virtual_server_group example {
 192.168.25.9 80
 }

virtual_server group example {
 lvs_sched      rr
 lvs_method     NAT
 protocol       TCP
 virtualhost    health

 real_server 10.0.0.249 80 {
  weight 1
  HTTP_GET {
   url {
    path /health.html
    status_code 200
   }
   connect_prot 80
   connect_timeout 5
  }
 }

 real_server 10.0.0.248 80 {
  weight 1
  HTTP_GET {
   url {
    path /health.html
    status_code 200
   }
   connect_prot 80
   connect_timeout 5
  }
 }
}

[root@Keep-LB keepalived]# vi /etc/sysctl.conf
net.ipv4.ip_forward = 0
아래줄과 같이 변경
net.ipv4.ip_forward = 1
[root@Keep-LB keepalived]# sysctl -p
net.ipv4.ip_forward = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296

keepalived 실행시 다음과 같은 error가 발생 한다.
Starting keepalived: /bin/bash: keepalived: command not found

에러 메시지 처리는 다음과 같이 하였다.
keepalived 실행 파일의 명령어 라인을 다음과 같이 바꾸었다.

start() {
echo -n $”Starting $prog: ”
daemon /usr/local/sbin/keepalived ${KEEPALIVED_OPTIONS}

그리고 생성 되지 않은 /etc/keepalived 또한 링크로 생성하였다.
[root@Keep-LB keepalived]# ln -s /usr/local/etc/keepalived/ /etc/keepalived

[root@Keep-LB keepalived]# service keepalived start

 [root@WEB2 send_arp]# cat failover3.sh
#!/bin/sh -x
VIP="10.0.0.1 10.0.0.2"
DEV="eth0"

ip_add() {
 MAC=`ip link show $DEV | egrep -o '([0-9a-f]{2}:){5}[0-9a-f]{2}' | head -n 1 | tr -d : `
 ip addr add $i/24 dev $DEV
 /root/fake-1.1.11/send_arp/send_arp $i $MAC 255.255.255.255 ffffffffffff
}

ip_del() {
 ip addr del $i/24 dev $DEV
}

healthcheck() {
 for i in $VIP;do
 OK=`curl -s -I http://$i/ | head -n 1 | cut -f 2 -d  '' | awk '{print $2}'`
 echo $OK
 if [ "$OK" = "" ];then
   OK="404"
   echo $OK
 fi
  if [ 200 -ne "$OK" ];then
   if [ -z "`ip addr show $DEV | grep $i/24`" ]; then
      ip_add $i
    else
      ip_del $i
   fi
  fi
 done
}

while true; do healthcheck;sleep 1;done

#!/bin/sh

VIP="10.0.0.1"

DEV="eth0"

healthcheck() {

 ping -c 1 -w 1 $VIP > /dev/null

 return $?

}

ip_takeover() {

 MAC=`ip link show $DEV | egrep -o ' ([0-9a-f]{2}:){5}[0-9a-f]{2}' | head -n 1 | tr -d : `

 ip addr add $VIP/24 dev $DEV

 send_arp $VIP $MAC 255.255.255.255 ffffffffffff

}

while healthcheck; do

 echo "health ok!"

 sleep 1

done

echo "fail over!"

ip_takeover