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there is no step by step guide for HA in controller, You may be interested in Oracle's guide though, mentioning most of the steps required to achieve it.
http://www.oracle.com/technetwork/server-storage/openstack/linux/documentation/ha-guide-oracle-openstack-2296039.pdf
BTW, are you going to just use 3+ controller nodes for POC or HA or what... there is a different scenario for every aspect ...
