The OpenStack architecture
Most OpenStack clouds are made up of physical infrastructure nodes that fit into one of the following four categories:
- Controller nodes: These usually run the application programming interface (API) services for all of the OpenStack components, including Glance, Nova, Keystone, and Neutron. In addition, controller nodes run the database and messaging servers and are often the point of management of the cloud via the Horizon dashboard. Most OpenStack API services can be installed on multiple controller nodes and can be load balanced to scale the OpenStack control plane.
- Network nodes: These usually run DHCP and metadata services and can host virtual routers when the Neutron L3 agent is installed. In smaller environments, ...
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