Logging like that is useful for admins, but I wonder if we should talk
about notifications as well. That would allow people to build systems which
warned the user as well that they are nearing quota.


On Tue, Oct 7, 2014 at 2:33 AM, Matt Riedemann <mrie...@linux.vnet.ibm.com>

> I'm floating this in case the idea has come up before.
> I've spent most of my day so far digging through logs and code for gate
> race bug 1353962 [1] where an admin tenant is going over-quota when trying
> to allocate fixed IPs for a test instance (the test setup creates 2
> instances and more test instances are created in some of the test cases).
> I'm going to push up some patches to nova to make the logs more useful
> when we hit this, i.e. log the quota limit and current usage for the given
> resource (fixed_ips in this case).
> But the idea that keeps coming up when I'm digging into stuff like this is
> it'd be nice to know when we're nearing over-quota so we can walk that back
> and figure out what was going on prior to us falling over the cliff. This
> isn't a novel idea, but I haven't heard it discussed before.
> What I'm thinking is basically add a config option for setting a threshold
> value which would dump warnings when you're over that threshold.  This
> could be configured per resource, e.g. I only care about fixed_ips,
> instances, etc.  It could be configured per tenant (maybe we only care
> about this for the admin tenant?).
> My use case would be specifically related to the bug in question, so I
> want to set the threshold at let's say 80%.  With a default fixed_ips quota
> of 10, when I've gotten over 8 reserved for the admin tenant, I start
> logging warnings that I'm nearing over-quota.  When we go over-quota on a
> request, we could then see what operations/requests were going on before
> this that tipped us over.
> Thoughts?
> [1] https://bugs.launchpad.net/nova/+bug/1353962
> --
> Thanks,
> Matt Riedemann
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