In this section, we'll walk through each of the OpenStack services and outline the HA strategy for them. While most of the services can be configured as active/active behind a load balancer, some of them must be configured as active/passive and others may be configured as active/passive. Some of the configuration is dependent on a particular version of OpenStack as well, especially Ceilometer, Heat, and Neutron. The following details are current as of the Pike release of OpenStack.
OpenStack service specifics
OpenStack web services
As a general rule, all of the web services and the Horizon dashboard may be run active/active. These include the API services for Keystone, Glance, Nova, Cinder, Neutron, Heat, and Ceilometer...
