HAProxy, Keepalived and neutron.

Hi, I'm in trouble. I want to do HA on my Openstack service, so i decide to do HAproxy and Keepalived. Keepalived provide HA for VIP using by HAProxy, And HAproxy do load-balancing using the VIP and the port of the service. But ... If by example, i have a network node. So i double that. If network node one go down, so HAproxy redirect to other API network node, but the network created in the network node one, i can't got him on the seconde network node, because there are one the one ... It's the same for glance image, cinder volume etc. What i don't understand ? Help me please, i can't work when i don't understand, and i don't see any response at my question ... Sorry for my english. Best Regards, L.L EDIT1: Need i configure the same database for all node ?