[Linux-HA] Understanding rule

[Andrew Beekhof]

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 ?



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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>