[Pacemaker] Convenience Groups - WAS Re: [Linux-HA] Unordered groups (was Re: Is 'resource_set' still experimental?)

[Alan Robertson]

That's a very interesting idea.  Since I'm generating the configuration 
from a script, that would be easy to add.

Also, I could have a variety of different - even overlapping - 
pseudo-groups implemented in this way.



On 04/19/2012 11:48 AM, David Vossel wrote:
> ----- Original Message -----
>> From: "Alan Robertson"<alanr at unix.sh>
>> To: pacemaker at oss.clusterlabs.org, "Andrew Beekhof"<andrew at beekhof.net>
>> Cc: "Dejan Muhamedagic"<dejan at hello-penguin.com>
>> Sent: Thursday, April 19, 2012 10:22:48 AM
>> Subject: [Pacemaker] Convenience Groups - WAS Re: [Linux-HA] Unordered groups (was Re: Is 'resource_set' still
>> experimental?)
>>
>> Hi Andrew,
>>
>> I'm currently working on a fairly large cluster with lots of
>> resources
>> related to attached hardware.  There are 59 of these things and 24 of
>> those things and so on and each of them has its own resource to deal
>> with the the "things".  They are not clones, and can't easily be made
>> clones.
>>
>> I would like to be able to easily say "shut down all the resources
>> that
>> manage this kind of thing".    The solution that occurs to me most
>> obviously is one you would likely call a "double abomination" ;-) -
>> an
>> unordered and un-colocated group.  It seems a safe assumption that
>> this
>> would not be a good path to pursue given your statements from last
>> year...
>>
>> What would you suggest instead?
>>
> This might be a terrible idea, but this is the first thing that came to mind.
>
> What if you made a Dummy resource as a sort of control switch for starting/stopping each "group" of resources that control a "thing".  The resource groups wouldn't actually be defined as resource groups, but instead would be defined by order constraints that force a set of resources to start or stop when the Dummy control resource starts/stops.
>
> So, something like this...
>
> Dummy resource D1
> thing resource T1
> thing resource T2
>
> - If you start D1 then T1 and T2 can start.
> - If you stop D1, then T1 and T2 have to stop.
> - If you flip D1 back on, then T1 and T2 start again.
> order set start (D1) then start (T1 and T2)
>
>
> -- Vossel
>
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-- 
     Alan Robertson<alanr at unix.sh>  - @OSSAlanR

"Openness is the foundation and preservative of friendship...  Let me claim from you at all times your undisguised opinions." - William Wilberforce