[Openstack-operators] Problems (simple ones) at scale... Invisible VMs.

David Medberry openstack at medberry.net
Wed May 18 22:37:42 UTC 2016

It seems to bypass it... or I'm running into a LOWER limit (undocumented).
So help on  limit -1 says it is still limited by osapi_max_limit

I'll check my config for that value (likely the default) when I get home.

On Wed, May 18, 2016 at 4:18 PM, Kris G. Lindgren <klindgren at godaddy.com>

> Nova has a config setting for the maximum number of results to be returned
> by a single call.  You can bump that up so that you can do a nova list
> —all-tenants and still see everything. However if I am reading the below
> correctly, then I didn't realize that the —limit –1 apparently by-passes
> that config option?
> ___________________________________________________________________
> Kris Lindgren
> Senior Linux Systems Engineer
> GoDaddy
> From: David Medberry <openstack at medberry.net>
> Date: Wednesday, May 18, 2016 at 4:13 PM
> To: "openstack-operators at lists.openstack.org" <
> openstack-operators at lists.openstack.org>
> Subject: [Openstack-operators] Problems (simple ones) at scale...
> Invisible VMs.
> So, we just ran into an "at-sale" issue that shouldn't have been an issue.
> Many of the OpenStack CLI tools accept a limit parameter (to limit how
> much data you get back from a single query). However, much less well
> documented is that there is an inherent limit that you will run into at a
> 1000 VMs (not counting deleted ones). Many operators have already exceeded
> that limit and likely run into this. With nova cli and openstack client,
> you can simply pass in a limit of -1 to get around this (and though it will
> still make paged queries, you won't have "invisible" VMs which is what I've
> begun to call the ones that don't make it into the first/default page.
> I can't really call this a bug for Nova (but it is definitely a bug for
> Cinder which doesn't have a functional get me all of them command and is
> also limited at 1000 for a single call but you can never get the rest at
> least in our Liberty environment.)
> box:~# nova list  |tail -n +4 |head -n -1 |wc
>    1000   16326  416000
> box:~# nova list --limit -1  |tail -n +4 |head -n -1 |wc
>    1060   17274  440960
> (so I recently went over the limit of 1000)
> Good luck.
> -d
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