[Pacemaker] Reload implemention for RA

[Jan Horníček]

Thank you for suggestions.

Finally I managed to rewrite the script, so it's capable of reloading.
But I have one question.

Why, when I remove the first parameter definition (parameter
name=status) in metadata section of Dummy RA, the reload isn't performed
and stop/start is applied instead?

It was also the reason, why my RA wasn't reloading. It started to work
after adding one parameter definition before the original one.

Thank you.

Jan Hornicek


On 09/26/2012 09:21 AM, pacemaker-request at oss.clusterlabs.org wrote:
> Message: 2
> Date: Tue, 25 Sep 2012 12:36:56 -0400 (EDT)
> From: David Vossel <dvossel at redhat.com>
> To: The Pacemaker cluster resource manager
> 	<pacemaker at oss.clusterlabs.org>
> Subject: Re: [Pacemaker] Reload implemention for RA
> Message-ID: <1441928510.645759.1348591016551.JavaMail.root at redhat.com>
> Content-Type: text/plain; charset=utf-8
>
>
>
> ----- Original Message -----
>> > From: "Jan Horn??ek" <jan.hornicek at cesnet.cz>
>> > To: pacemaker at oss.clusterlabs.org
>> > Sent: Tuesday, September 25, 2012 6:54:16 AM
>> > Subject: [Pacemaker] Reload implemention for RA
>> > 
>> > Hello,
>> > I'm trying to implement reload functionality to ocf:sgi:cxfs-client
>> > script. The rewritten script is working if called from shell, it pass
>> > ocf-tester. When I change the parameter of the primitive based on
>> > that
>> > RA in the crm shell and commit the change I get restart (stop and
>> > then
>> > start) actions. When I try ocf:heartbeat:Dummy based primitive and
>> > change it's parameter I get reload action.
>> > unique="0" set to both parameters in meta-data
>> > pacemaker version 1.1.5
> Pacemaker determines if a ocf resource is reloadable by reading the resource script's meta_data() output.  Take a look at the pacemaker/Dummy script in a text editor.  The meta_data() function returns documentation on what the agent is capable of in xml. Pacemaker is looking through the xml output of that meta_data() function for <actions><action name='reload'/></actions> to determine if the resource can reload.  Then pacemaker looks through the <parameters/> tags for parameters with unique="0" to determine what parameters are allowed to be reloaded.
>
> Hope that helps.
>
> -- Vossel
>
>> > 
>> > My questions are:
>> > 
>> > 1) Is it possible to somehow debug the decision of the pengine for
>> > the
>> > task? (Something like reload not possible because ...)
>> > 
>> > 2) Is there any way how to force the reload of changed primitive's
>> > parameters?
>> > 
>> > 3) I'm not able to find more restrictions allowing reload to be
>> > functional except setting parameter unique="0" in it's meta-data
>> > definition of RA. Are there others?
>> > 
>> > Thank you for your suggestions.
>> > 
>> > Jan Hornicek
>> > 
>> > 
>> > 
>> > 
>> > _______________________________________________
>> > Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>> > http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>> > 
>> > Project Home: http://www.clusterlabs.org
>> > Getting started:
>> > http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
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>> > 

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