Open Stack

Do most systems have access to a dns system that can be used to check? Maybe that could be one of these plugins.

From: Craig J <craig.jellick at gmail.com<mailto:craig.jellick at gmail.com>>
Date: Monday, February 3, 2014 at 1:58 PM
To: Joel Cooklin <joel.cooklin at gmail.com<mailto:joel.cooklin at gmail.com>>
Cc: "openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>" <openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>>
Subject: Re: [Openstack] nova unique name generator middleware

There's currently a check in nova for max length. It's hard coded to 255. Easy low-hanging fruit would be to make that number configurable and add a configurable regex check on the server name.

The uniqueness check could be trickier: checking the nova db wouldn't be sufficient in many cases as most people need to check some external system(s). Maybe we could put together something pluggable with a nova-db check as an example. Is a wsgi filter the most appropriate place for such a pluggable validator or should it be deeper, at the same place where the other server name validation occurs?



On Mon, Feb 3, 2014 at 6:46 AM, Joel Cooklin <joel.cooklin at gmail.com<mailto:joel.cooklin at gmail.com>> wrote:
>>Shouldn't "nova list" and some shell script magic do most of this?

For our use case this won't work as well since several business units
(tenants) make direct use of the APIs.  It's hard to enforce that they
use our wrappers and the like.  It would be much more convenient in
our case if we could enforce business logic via a plugin for all
requests regardless of the client being used to access the API.

On Sun, Feb 2, 2014 at 11:48 PM, Aryeh Friedman
<aryeh.friedman at gmail.com<mailto:aryeh.friedman at gmail.com>> wrote:
> Shouldn't "nova list" and some shell script magic do most of this?  The only
> problem would be to make sure that two people didn't ask for a name at the
> same time
>
>
> On Mon, Feb 3, 2014 at 1:19 AM, Tim Bell <Tim.Bell at cern.ch<mailto:Tim.Bell at cern.ch>> wrote:
>>
>> > -----Original Message-----
>> > From: John Griffith [mailto:john.griffith at solidfire.com<mailto:john.griffith at solidfire.com>]
>> > Sent: 03 February 2014 03:47
>> > To: Joel Cooklin
>> > Cc: openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>
>> > Subject: Re: [Openstack] nova unique name generator middleware
>> >
>> > On Sun, Feb 2, 2014 at 7:26 PM, Joel Cooklin <joel.cooklin at gmail.com<mailto:joel.cooklin at gmail.com>>
>> > wrote:
>> > > +1 intel use cases.  It would be nice to avoid our current custom
>> > > patches.
>> > >
>> > >
>> > > On Sunday, February 2, 2014, Joshua Harlow <harlowja at yahoo-inc.com<mailto:harlowja at yahoo-inc.com>>
>> > > wrote:
>> > >>
>> > >> +1 yahoo use case(s) would also benefit from not having to patch the
>> > >> +code
>> > >> to achieve similar results.
>> > >>
>> > >> Sent from my really tiny device...
>> > >>
>> > >> > On Feb 2, 2014, at 12:12 AM, "Tim Bell" <Tim.Bell at cern.ch<mailto:Tim.Bell at cern.ch>> wrote:
>> > >> >
>> > >> > It would be interesting to have a formal exit inside OpenStack nova
>> > >> > at VM creation for this sort of check rather than having to patch
>> > >> > the code.
>> > >> >
>> > >> > Other scenarios that I've seen is where there is a need to enforce
>> > >> > limits as the server name is used for other purposes. Examples are
>> > >> > characters in the server name or maximum length.
>> > >> >
>> > >> > Tim
>> > >> >
>> ...
>> > >
>> > Maybe just an auto-naming option added to nova's existing boot call; use
>> > a prefix and the UUID of the instance would satisfy the
>> > cases people are talking about here and not impact existing users?
>> >
>>
>> We have a set of other use cases which are around the use of the server
>> name to get a Kerberos/X.509 identity which imposes other restrictions on
>> the name being chosen (such as maximum length and limited set of
>> characters). The unique name is one scenario but there are others.
>>
>> Thus, we could start adding new options such as "max server name length"
>> and "server name character set" or we find a way to do a plugin.
>>
>> Tim
>>
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>
>
>
>
> --
> Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org

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