[Pacemaker] Reload implemention for RA

[David Vossel]

----- Original Message -----
> From: "Jan Horníček" <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
> 
> 
> 
> 
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