In 3.5.0 last image sync in the controller page is wrong

[Jacopo Rota]

As per title the controllers page is showing the wrong information regarding the "last image sync" as it report "Never".

In 3.5.0 the racks are not doing any sync as they fetch and cache the images on demand.

[Peter Makowski (petermakowski)]

This is related to https://bugs.launchpad.net/maas-ui/+bug/2058016

[Thorsten Merten (thorsten-merten)]

Due to the change to a ring buffer kind of cache, we don't really sync images to the controller anymore. It would be good if we could at least report "cached" and "not cached" for every image.

We need to check if the controller offers a way to report this status and if not this requires a back-end change as well.

Can you elaborate Alexsander?

[Alexsander de Souza (alexsander-souza)]

No, currently the region has no clue about the status of the racks cache. Images are downloaded and evicted from the cache without region awareness.

This would need model and API changes to track what images each rack has.

[Jerzy Husakowski (jhusakowski)]

In 3.5, the way images are synchronised is changed. An image that can be deployed must be synchronised between region controllers, if it's not synchronised it's not considered available and wouldn't be shown on the UI. Rack controllers download images from regions on demand and cache them, making synchronisation status irrelevant. The synchronisation status needs to be removed from the UI in MAAS 3.5+.