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Your request is reasonable, but not currently handled by the code. Its
a bit concerning that your cache is so disk constrained -- is it a
separate filesystem from the instance disk images?

Michael

On Tue, Mar 31, 2015 at 3:26 PM, Chris Buccella
<chris.buccella at verilume.com> wrote:
> I'm running Juno. Here's my situation:
>
> 1) There are a bunch of cached images on the compute nodes
> (/var/lib/nova/instances/_base/)
> 2) I want to keep the images in the cache as long as possible (for
> performance reasons)
> 3) I want to be able to spawn instances with an uncached image
>
> What I've observed is that if the cache is full, it won't automatically be
> cleaned up when a new image tries to be cached. Instead, I get a "no valid
> host" error when trying to boot a new instance. I've found the following
> relevant config parameters:
>
> image_cache_manager_interval
> remove_unused_base_images
> remove_unused_original_minimum_age_seconds
>
> These work, but don't really help me. I don't want time-based cache
> management, but on-demand cache management. Basically, if
> removed_unused_base_images is true, the oldest image should be removed from
> the cache to make room for the new one.
>
> Has anyone else encountered this situation? Maybe there's something I'm
> missing?
>
> Thanks,
>
>
> -Chris
>
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