Hello guys,
I've got a similar question about cache-manager and the presence of a
shared filesystem for instances images.
I'm currently reading the source code in order to find out how this is
managed but before I would be curious how you achieve this on production
servers.
For example images not used by compute node A will probably be cleaned
on the shared FS despite the fact that compute B use it, that's the main
problem.
How do you handle _base guys ?
Thanks
Kind regards,
Le 01/04/2015 08:07, Gary Kotton a écrit :
At the moment the aging is pretty rudimentary. There were patches in the
Icehouse cycles that tried to address issues like this but they did not
get any reviews and were eventually abandoned.
It would be nice if there were different options for aging, maybe we
should even try and explore something pluggable so that people could add
drivers for various use cases.
I would be happy to work on this in the next cycle if you would like to
collaborate
Thanks
Gary
On 3/31/15, 10:56 PM, "Michael Still"<mi...@stillhq.com> wrote:
Ok, so that sounds like a totally reasonable feature request to me.
Can you please file a bug so its tracked and let me know the bug
number?
Thanks,
Michael
On Wed, Apr 1, 2015 at 1:27 AM, Chris Buccella
<chris.bucce...@verilume.com> wrote:
The instance disk images are stored in ceph.
This isn't a situation we hit often. But when several users are booting
large, short-lifecyle instances (say, Windows, or Hadoop images to use
with
Sahara), they get the "no valid host" error. The only recourse then is
for
an admin to manually clean up the cache, or wait for the periodic cache
cleanup.
-Chris
On Tue, Mar 31, 2015 at 1:01 AM, Michael Still<mi...@stillhq.com>
wrote:
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.bucce...@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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