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Exchange of data between two nodes in a High Available Server [Apache2] (using Heartbeat or not) in a Cluster

I want to know if there is a way to do this. Meaning if there is a way for data exchange between the two nodes(primary and secondary) in a high availability server in a cluster using apache2. By ...
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Ceph Openstack HA installation with maas and juju but partially on physical servers and few on virtual machines

I am planning to deploy OpenStackHA which 28 servers, which is quit a lot for me. So i am thinking to put up few of roles like rabbitmq, mysql, cloud controller, horizon on virtual machines on KVM ...