High availability (HA) deployment mode includes active and standby nodes to ensure that services are not interrupted.

An HA deployment runs on 13 virtual machines. These include two load balancers, three database nodes, two controllers, two memory cache nodes, two message queue nodes, one compute node, and the OpenStack Management Server. In VDS networking mode, an additional two nodes are required for DHCP, for a total of 15 virtual machines.

Figure 1. Management Cluster in HA Mode