1. What is the problem?
In production clouds, each availability zone (AZ) is built by modularized
OpenStack instances. Each OpenStack instance acts as a pod. One AZ
consists of multiple pods. Among the pods within an AZ, they are
classified into different categories for different proposes, for instance,
general propose, CAD modeling and so on. Each tenant is bound to one pod,
where it creates various types of resources. However such a binding
relationship should be dynamic instead of static. For instance when
some resources in the pod are exhausted, tenant needs to be bound to a
new pod in same AZ.
2. What is the solution to the problem?
To deal with the above problem, the Tricircle dynamically bind tenants
to pod which has available resources. We call this feature dynamic pod
binding
3. What the features need to be implemented to the Tricircle to realize
the solution?
To realize dynamic pod binding, the following features need to be
implemented in the Tricircle.
1) To collect the usage in pod daily to evaluate whether the threshold
is reached or not.
2) To filter and weigh all the available pods for cloud tenants to bind
a tenant to a proper pod.
3) To manage and maintain all the active and historical binding
relationship.
This spec explains how Tricircle binds pods to tenants dynamically
in detail.
Blueprint: https://blueprints.launchpad.net/tricircle/+spec/dynamic-pod-binding
Change-Id: Ib429a59d3d216e578f9c451d84c1fe9a333cf050
a1602f7e5e