[Linux-HA] A resource starts when an event happens

[ZiLioN ZilLioN]

> From: beekhof at gmail.com
> To: linux-ha at lists.linux-ha.org
> Subject: Re: [Linux-HA] A resource starts when an event happens
> Date: Fri, 18 Jul 2008 09:50:32 +0200
> 
> look up rsc_location constraints in:
> 
>    http://clusterlabs.org/mw/Image:Configuration_Explained.pdf
> 

The document has examples for running the resources in the node with the best connectivity or examples of choosing a location based on connectivity.
I search a configuration that a resource x, starts only when an event happens, not before. For example:

A resource IPaddres starts when the node miss the connectivity and this recourse will stop when the node will have connectivity.
A rsc_location is the solution? How would this rsc_location?

Does the configuration below because it is no valid?

 
> On Jul 18, 2008, at 2:08 AM, ZiLioN ZilLioN wrote:
> 
> >
> > Hello!
> > I want a configuration that a resource IPaddress starts ONLY when  
> > the node miss conectivity (pingd), not before.
> > This configuration is possible:
> >
> > <primitive id="..." class="..." provider="..." type="IPaddr"  is_managed="false">
> >        <operation>
> >                <op id="..." name="start" timeout="5s" prereq="nothing"  on_fail="restart" role="stopped">
> >                        <instance_attributes id="...">
> >                                <rule id="..." score="INFINITY">
> >                                        <expression id="..." attribute="pingd"  operation="not_defined" />
> >                                </rule>
> >                                <attributes>
> >                                        <nvpair id="..." name="ip" value"x.x.x.x" />
> >                                </attributes>
> >                        </instance_attributes>
> >                </op>
> >        </operation>
> > </primitive>
> >
> > I think that this configuration is very difficult...
> >
> > How do I do?

The expression return true o false when the connectivity is miss. In this case the operation is start...Is rare :)

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