My basic need was to balance to traffic between MySQL Slaves according to the application needs. Due to the MyISAM storage on some databases I let to some applications the delay up to 120 s. (I measured the delay with MySQL command `show slave status`. I created two clusters:
1) Slaves – no delay;
2) Slaves – up to 120s delay;

First of all, I have read on the Internet only tutorials for LB conisted of:

1) Keepalived (for VRRP as backup server)
2) HaProxy as LB MySQL.

I configured HaProxy and it works fine. The GUI is beautiful! However, my client was to used keepalived for another purpose so I wanted to avoid to introduce some additional applications. I choose the Keepalived taking into considerations the following conditions:
a) HaProxy works on 7-th layer of OSI.
b) HaProxy use NAT for LB. In case of MySQL you have to resign from privilages per host.

on lvs:
sysctl -w net.ipv4.ip_forward = 1

on real servers:
ifconfig lo:0 10.0.0.237 netmask 255.255.255.255 broadcast 10.0.0.237 up
ifconfig lo:1 10.0.0.238 netmask 255.255.255.255 broadcast 10.0.0.238 up

OR with ip command:

ip addr add 10.0.0.237/32 broadcast 10.0.0.237 dev lo label lo:1
ip link set lo:1 up
ip addr add 10.0.0.238/32 broadcast 10.0.0.238 dev lo label lo:2
ip link set lo:2 up

http://kb.linuxvirtualserver.org/wiki/Using_arp_announce/arp_ignore_to_disable_ARP
sysctl -w net.ipv4.conf.bond0.arp_ignore=1
sysctl -w net.ipv4.conf.bond0.arp_announce=2
sysctl -w net.ipv4.conf.bond0/15.arp_ignore=1
sysctl -w net.ipv4.conf.bond0/15.arp_announce=2
sysctl -w net.ipv4.conf.default.arp_announce=2
sysctl -w net.ipv4.conf.default.arp_ignore=1

My links:
http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.arp_problem.html
http://linuxdevcenter.com/pub/a/linux/2005/09/01/keepalived.html?page=2
http://gcharriere.com/blog/?p=339
http://en.wikipedia.org/wiki/Address_Resolution_Protocol