Image caching is important for environments that don't use image snapshots and want to perform burst deployments for many VMs using the image. By pre caching images, the image is warmed locally on the controllers allowing faster delivery to the compute nodes and reducing the overall deployment time.

This feature tracks support for the new Glance Cache API

Today the only supported way to manage the glance cache is to use glance-cache-manage local tool.
This raises several issues:

No centralised way to manage cache; need to connect to each nodes.
Requires ssh access and appropriates permissions to the glance cache node(s)

At a minimum:

List glance cache nodes
List cached images on a specific node
Queue an image for caching on a specific node
List queued images on a specific node
Delete an image from the cache queue
Purge an image from a specific node
Optionally:

Purge all images from a specific node
Goal is to have feature parity with glance-cache-manage.