Don't forget to configure iptables to allow vrrp protocol between servers.
Example:
# Allow keepalived
-I INPUT -i eth1 -d 224.0.0.0/8 -p vrrp -j ACCEPT
-I OUTPUT -o eth1 -d 224.0.0.0/8 -p vrrp -j ACCEPT
-I INPUT -i eth2 -d 224.0.0.0/8 -p vrrp -j ACCEPT
-I OUTPUT -o eth2 -d 224.0.0.0/8 -p vrrp -j ACCEPT
