Red Hat OpenStack Administration I: Core Operations for Domain Operators
In this chapter, you learned:
You can perform a multisite deployment using a single or multiple stacks. Stacks can be managed, scaled, and updated separately.
Not all nodes within a stack need to be located in the same physical location. The
openstack stack listcommand is used to list all available stacks within the overcloud.Hyperconverged is a node configuration that combines a normal hypervisor compute role with local Ceph OSDs on the same compute node. Red Hat Hyperconverged Infrastructure always uses Ceph as the storage component.
Resource segregation is important to permit large horizontal scalability for cloud applications. It means that infrastructure can be grouped based on physical characteristics or functionality. Workload segregation can work at host level or CPU level.
The Placement service offers a REST API stack and data model used to track resource provider inventories and usage. It includes a database to store information from the overcloud infrastructure, such as node attributes and location, CPU count, and free and used memory.
The resource provider manages quantitative aspects at the boot request. It has a collection of inventory and allocation objects to manage these quantitative requests. However, the resource provider also needs to manage nonconsumable, or qualitative, resources.
