TripleO/TuskarGlossary

Resource Class

A Resource Class can be thought of as a cloud 'building block'. It consists of a set of Racks, and defines the types of VM instances that can be supported by the Nodes in those Racks.

Tuskar supports four Resource Class types:

• Controller Class Class that provides all services other than compute and storage services
• Compute Class Class that defines and provides compute services
• Object Storage Class Class that defines and provides object storage services
• Block Storage Class Class that defines and provides block storage service

Flavors

A Flavor is a hardware configuration. Its definition is aligned with the "instance_type" (aka 'Flavor') used in the OpenStack Nova API.

Flavors are defined for a given ResourceClass and semantically describe the types of compute instances that can be launched for that ResourceClass. Each Flavor has a set of Capacities that describe a particular aspect of the hardware configuration, such as cpu, memory or storage.

When a Node is provisioned, the Flavors that are defined for that Node's Resource Class are registered in Nova,

Resource (Rack and Node)

There are two kinds of Resources:

• Node A Node is a single physical compute unit. It corresponds to a compute Node in Nova Baremetal (and eventually, in Ironic).
• Rack A Rack is a physical or logical grouping of Nodes. It can be thought of as a server rack in a datacenter. A Rack is assigned to a Resource Class, and can be managed as a single unit.

There are two types of Racks:

• Controller Rack A Rack that belongs to a Controller Resource Class.

• Management Node This Node is responsible for all Undercloud services. It also controls the rest of the Nodes in the Controller Rack.
• Controller Node These are all other Nodes in a Controller Rack. Controller Nodes run non-resource Overcloud services.

• Resource Rack A Rack that belongs to a Compute/Object Storage/Block Storage Resource Class.

• Leaf Management Node This Node has responsibility for all other Nodes in the Resource Rack
• Resource Nodes These are all other Nodes in a Resource Rack.

Images

Images are provisioned on Baremetal Nodes. They allow Overcloud services to run.