May 2018
Intermediate to advanced
256 pages
7h 6m
English
Content preview from OpenStack for Architects - Second Edition
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HA control cluster
Many different distributions use HAProxy to enable active/active availability across multiple OpenStack control servers (a minimum of three). This HAProxy service acts as a reverse proxy and simple load balancer configured to listen to VIP addresses in front of the OpenStack endpoint addresses. It is a common practice to have HAProxy running on each one of the controller nodes in an HA cluster. Since the HAProxy service is tied to the VIP addresses configured for the OpenStack API services, if these services fail under HAProxy, then HAProxy itself will fail over to another controller node for the service. However, HAProxy does not monitor or fail over the processes, nor does it move the VIP addresses to other cluster members. ...
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