[Linux-HA] Understanding rule

[Andrew Beekhof]

On 7/9/07, Adrian Chapela <achapela.rexistros at gmail.com> wrote:
>
> Andrew Beekhof escribió:
> > On 7/6/07, Adrian Chapela <achapela.rexistros at gmail.com> wrote:
> >>
> >> This rule is quite simple but I can't understand well.
> >>
> >>          <rule id="my_resource:connected:rule" score="-INFINITY"
> >> boolean_op="or">
> >>            <expression id="my_resource:connected:expr:undefined"
> >> attribute="pingd" operation="not_defined"/>
> >>            <expression id="my_resource:connected:expr:zero"
> >> attribute="pingd" operation="lte" value="0"/>
> >>          </rule>
> >>
> >> The first expression check if the attribute pingd is defined (I
> >> think...) and the second expression compares the same attribute with 0.
> >> My problem is, What it's this attribute ?? Who update its value  (I
> >> think pingd, but the executable or the OCF script)??
> >
> >
> > the OCF script is just a wrapper for the executable
> >
> > have you read all of http://www.linux-ha.org/v2/faq/pingd ?
>
> Yes, but I don't understand how can pingd update CIB to change the Score
> with this rule ??



it doesn't change the rule, it changes a node attribute named "pingd"

the rule then looks this value up for each node the rule is applied on

How must my script do to update a similar rule ??
>
> I only need a clone and the with a rule change a score to move the
> IPAddr resource, can you explain me a bit ??


that depends, when would the IPaddr need to move?


Thank you.
> >
> >
> >
> > Now I think in the same rule for other resource:
> >>
> >>          <rule id="my_resource:connected:rule" score="-INFINITY"
> >> boolean_op="or">
> >>            <expression id="my_resource:connected:expr:undefined"
> >> attribute="my_daemon" operation="not_defined"/>
> >>            <expression id="my_resource:connected:expr:zero"
> >> attribute="my_daemon" operation="lte" value="0"/>
> >>          </rule>
> >>
> >> How can I do to update the value of this attribute ? If I can update
> >> this value, I can force movement the resource group to another node. My
> >> it's only the rules, I don't understand how the script can to interact
> >> with the CIB.
> >>
> >> Thank you!!
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> >> http://lists.linux-ha.org/mailman/listinfo/linux-ha
> >> See also: http://linux-ha.org/ReportingProblems
> >>
> > _______________________________________________
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> > Linux-HA at lists.linux-ha.org
> > http://lists.linux-ha.org/mailman/listinfo/linux-ha
> > See also: http://linux-ha.org/ReportingProblems
> >
>
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>