OpenStack for Architects - Second Edition

Planning the physical architecture

In the previous chapter, we updated the Physical architecture section to include a definition of the various host groups that we will be deploying. The simplest way to achieve HA is to add additional cloud controllers to the deployment and cluster them. Other deployments may choose to segregate services into different host classes, which can then be clustered. This may include separating the database services into database nodes, separating the messaging services into messaging nodes, and separating the memcached service into memcache nodes.

Load balancing services might live on their own nodes as well. The primary considerations for mapping scalable services to physical (or virtual) hosts are the following: ...