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Thank you for your quick reply and please correct me if I'm saying anything wrong as I'm new to Openstack.

I have worked on environment where we have haproxy in the front and the request is served by the backend server but when I read carefully and there was a statement in the documentation which made me believe HAproxy is on the same server as the controller.

Below are few of the statements in the official documentation which I got confused "The common practice is to locate an HAProxy instance on each OpenStack controller in the environment." and "Here is an example /etc/haproxy/haproxy.cfg configuration file. You need a copy of it on each controller node."

Also when I did further research for HA architecture Diagrams. I found the Sample HA Architecture which shows that the HAproxy was residing on the controller

Please do correct me if I'm understanding wrong from the documentation and diagram.