On 2018-11-18 09:11, Mohammed Naser wrote:

https://blueprints.launchpad.net/nova/+spec/openstack-api-hostid
 
This should take care of it, don't know if it exists in Juno though.

It *does* exist in Juno, it *can't*, however, do what I want -- at least, generically.  The hostId that gets returned is a value that's (apparently) used to let you know, semi-anonymously, how affinity is (or isn't) working for your VMs.  So you get a unique identifier for each hypervisor -- but it has no *obvious* bearing on the hostname.   It's an id that's formed from the SHA224 hash of the ID of your tenant and the hostname of the hypervisor -- a bit of a catch-22, that, and prevents you from being able to make use of the hash if you don't know your back-end.  But... I do.  So I created an associative array with all the current (and, God willing, future) hypervisor hostnames in my company, with the key being the hostId/hash, and the value being the hypervisor name.  Then I queried my VMs, got all the hostIds, used that as the index to query my associative array, and bingo!  My hypervisor's name.

Kinda fugly, but when you have a standardized hypervisor hostname nomenclature, it's sufficient, without having to go mucking about with changing poorly-documented Nova policy.json stuff in a four-year-old release of OpenStack.

I'll take it.  Thanks!

-Ken



On Thu, Nov 15, 2018 at 1:49 PM Ken D'Ambrosio <ken@jots.org> wrote:
Hey, all.  We've got a Juno cloud, and we'd like various end-users to be
able to see which hypervisors their VMs spring up on. 
/etc/nova/policy.json seems to have some relevant info, but it's hard to
tell what does what.   "compute_extension:hypervisors" looks like a
possible candidate, but that's so vague that there's no telling what,
exactly, is meant by "hypervisors".  So:

* Given that I just want the hypervisor:VM association, any suggestions
as to which rule(s) to modify?
* Failing that, wondering if there's any for-real documentation on what
the various options in policy.json *do*.  I've found many, many lists of
what's in a generic policy.json, but nothing that went into detail about
what does what.

Thanks!

-Ken

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