Mailing List Archive

On Jan 2, 2008, at 9:13 PM, Michael Schwartzkopff wrote:

> Hi,
>
> I just started to play around with ptest. Really nice, esp. the
> graphs.
> But one thing I do not understand ...
> 1) I copy the active CIB to a file: cibadmin -Q > tmp.xml
> 2) I do changes in that file: vi tmp.xml
> In particular I change the IP address of a IPaddr2 resource.
> 3) I run ptest and it tells me (correctly) that it would shut down the
> resource and start ist again.
>
> How does ptest know what I changed in my CIB? I checked that it does
> NOT
> compare it to the running CIB, and the IP address is not noted in the
> status section of the CIB. So how does ptest the job?

in the status section you'll find a whole lot of lrm_rsc_op "objects" ^
these represent a cluster operation and includes a number of fields
that help us determine which order they were performed in and what
parameters where used.

in particular, there is a field called "op_digest" which we use to
detect changes to the resource's parameters

this is why I'm constantly asking people for their complete
configuration... i need the status section :-)


^ as an example:

<lrm_rsc_op id="child_DoFencing:5_monitor_120000"
operation="monitor" crm-debug-origin="do_update_resource"
transition_key="73:14:03cf0502-d7a2-4481-884b-6a6edf5813f0"
transition_magic="0:0;73:14:03cf0502-d7a2-4481-884b-6a6edf5813f0"
call_id="35" crm_feature_set="2.0" rc_code="0" op_status="0"
interval="120000" op_digest="20a63c39752cf941c02f4cba2a8a7b60"/>



>
>
> Thanks for any enlighting answer.
>
> Michael Schwartzkopff.
>
> _______________________________________________
> Pacemaker mailing list
> Pacemaker@clusterlabs.org
> http://list.clusterlabs.org/mailman/listinfo/pacemaker


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On Jan 2, 2008, at 10:36 PM, Michael Schwartzkopff wrote:

> (...)
>>> How does ptest know what I changed in my CIB? I checked that it does
>>> NOT
>>> compare it to the running CIB, and the IP address is not noted in
>>> the
>>> status section of the CIB. So how does ptest the job?
>>
>> in the status section you'll find a whole lot of lrm_rsc_op
>> "objects" ^
>> these represent a cluster operation and includes a number of fields
>> that help us determine which order they were performed in and what
>> parameters where used.
>>
>> in particular, there is a field called "op_digest" which we use to
>> detect changes to the resource's parameters
>
> So this fields contain some hash of the configuration at the last
> change. If
> the hash changes ptest can find out what changed and do the nescessary
> transitions. Am I right here?

mostly - it knows something changed, but not which specific field


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